From nobody Thu Mar 1 02:25:41 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5644212D86A; Thu, 1 Mar 2018 02:25:39 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.18 X-Spam-Level: X-Spam-Status: No, score=-2.18 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, STOX_REPLY_TYPE=0.439, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JXJQVPGSq9xa; Thu, 1 Mar 2018 02:25:37 -0800 (PST) Received: from mout.gmx.net (mout.gmx.net [212.227.17.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5957912711D; Thu, 1 Mar 2018 02:25:37 -0800 (PST) Received: from srichardlxp2 ([213.143.121.76]) by mail.gmx.com (mrgmx101 [212.227.17.168]) with ESMTPSA (Nemesis) id 0MGEv5-1etpiE2wxL-00F9wk; Thu, 01 Mar 2018 11:25:33 +0100 Message-ID: <23187136694049B3BEA2C7FAD794E280@srichardlxp2> From: "Richard Scheffenegger" To: "Michael Tuexen" , Cc: References: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> Date: Thu, 1 Mar 2018 11:13:59 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 X-Provags-ID: V03:K0:xVlyqzkxbcNz7kDzb/sWiO/55qDoNOL1Xb+ZW5MNK2gn5+i6PsR UuoV97/EiK9jNngLmTkWfQwfVLG4uwcjNkX0TUg24wMd6ehMqEGQZfH3mXRpB24kun0qWbS 67wH4mir5wox2a5lnXjMLrFvs32aMnEC4bqXYGJklAzRvdBf6kghGtRLFtJejG1Vq3n9V+N wJyqwYOPxh/nbMenimiCQ== X-UI-Out-Filterresults: notjunk:1;V01:K0:XAhYWs+8HR4=:W9Jk2MkIv6Bs4zOyGDjfLH WYEUh/xS+NFqv7ARv5bRklTw0ygMItITsZn9XuDBkWGGna+XVLnj5Mo0fBkVY4OQKJqL9I7pJ LN/RCw+ezcTQr74V+jYiJVOjeQublfi90lXBo02ZvE5TnprLIgEbn/36cyx3kKZNPnPXCrQE8 pU7RHvahbFxsnwCvyFi0HIQDjoE41ng0TF46CWaxbkkFGydP/5oSCmvaA/Fln7EZAT4r4VREI K5+wn3K7e/JpaHwtTYy2iBVcnAFiG+159RoBESRyZaOmREs0dPM0h9aVhd3wIxz9I75e6GIGC 1RABHQFP90a61DOnvre2i9idthjosayxRf89NZPT8QBXt1yIRLdcfMqpWMAHAiN22pj4cl8kz 7mGW5BZE5EmhEPjfF7iJ/KV8y8C9lYCepWBjCU8B75G7sIRgfHzu0023w9EYotx7PCUqsh99f fFkPETjoRuK0mi+/mzYwDwQAa9pNLMTZ0MhulC6ygKZK9ZfuK3sFTKRtEnkA24sqrP2QYJ8YG AW6uuap4pHepbDPOU2iva0zMYD+0lVFXWiX4I74su5xdSh4tV1tsrS6cbm4AQwE/jN27EIs31 64aMl7lS3dUoYjcJXuk3aD1jsQ8NyBuNnl27fY2hs0AI+I6m0BnF5kmkEMWSvApodir6MxcTj FlGYqQJGQ1zcR7A6mKNy9lBuBlyUHl46Pt8VBAAclt95IvzlVC6SkrE0cQEdkxJYenHksB/Fx BEvtco6+3NUzMpUWQjwBzvWBXXJ8DeJJH++p7w8aF3NYaphmf0T1+sQHGJBnz7bEQ0D52Dla7 l8w0TDqAcfk++LdjhMegrBBhFj8AclXNdGCqYWLwyniWhcavqY= Archived-At: Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Mar 2018 10:25:39 -0000 Hi, Some of the I-D references are already RFCs; Reading the FreeBSD modular cubic code, using a beta value of 0.8 (vs. 0.7 reportedy in Linux), I'm wondering if some generic rules-of-thumb, as to what a reasonable beta_loss vs. beta_ecn adjustment would be in this RFC might be in order (although I agree, that CCs should come up with reasonable guidance there). Other than this, I like this draft, as it also gives some additional incouragement to deploy ECN. Best regards, Richard ----- Original Message ----- From: "Michael Tuexen" To: Cc: Sent: Wednesday, February 28, 2018 9:12 PM Subject: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm > > > --- > This email has been checked for viruses by AVG. > http://www.avg.com > From nobody Sun Mar 4 02:34:37 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0ABE2120713; Sun, 4 Mar 2018 02:34:36 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.92 X-Spam-Level: X-Spam-Status: No, score=-1.92 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001] autolearn=ham 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(localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BE0491270AC; Sun, 4 Mar 2018 04:50:22 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.91 X-Spam-Level: X-Spam-Status: No, score=-1.91 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FLLss3in8w1v; Sun, 4 Mar 2018 04:50:20 -0800 (PST) Received: from pegasus.erg.abdn.ac.uk (pegasus.erg.abdn.ac.uk [IPv6:2001:630:241:204::f0f0]) by ietfa.amsl.com (Postfix) with ESMTP id 7A9CE1243F3; Sun, 4 Mar 2018 04:50:20 -0800 (PST) Received: from Gs-MacBook-Pro.local (fgrpf.plus.com [212.159.18.54]) by pegasus.erg.abdn.ac.uk (Postfix) with ESMTPA id 17E7E1B0010D; Sun, 4 Mar 2018 12:49:42 +0000 (GMT) Message-ID: <5A9BEB65.6010102@erg.abdn.ac.uk> Date: Sun, 04 Mar 2018 12:49:41 +0000 From: Gorry Fairhurst Reply-To: gorry@erg.abdn.ac.uk Organization: University of Aberdeen User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: "Scharf, Michael (Nokia - DE/Stuttgart)" CC: Yingzhen Qu , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" , Thomas Nadeau , "tcpm@ietf.org" References: In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [tcpm] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Mar 2018 12:50:23 -0000 I am unsure yet what the correct group of people world be to explore a "Bandwidth Guaranteed Network". The presentation last IETF looked like the work could imply a need for changes proposed to the network layer (using OAM exchnages) to set the sending rate and make those bandwidth reservations. In the end, it could result in a protocol quite different to TCP, I think this sort of change may possibly have a home in TSVWG - but first I'd agree with Michaeland would encourage a presentation of the problem statement in ICCRG to explore the issues. Gorry On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) wrote: > > Hi all, > > From the abstract: “…This draft proposes a new TCP congestion control > algorithm used in bandwidth guaranteed networks. It is an extension > to the current TCP standards.” > > In the IETF, I believe the expertise for this specific document would > be in TCPM, which in CC. If the authors are interested in feedback on > the proposed mechanism, I would recommend to ask TCPM. > > Alternatively, corresponding research could perhaps be performed in > the ICCRG. ICCRG has published RFC 6077 to document some of the open > research issues in this space. > > Michael > > *From:*tsvwg [mailto:tsvwg-bounces@ietf.org] *On Behalf Of *Yingzhen Qu > *Sent:* Sunday, March 04, 2018 6:55 AM > *To:* tsvwg@ietf.org; tsvwg-chairs@ietf.org > *Cc:* Thomas Nadeau > *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 > > Dear Chairs, > > A new draft (The draft was suggested by TSVWG @IETF100) was just > submitted, and we’d like to request a time slot to present it @IETF101. > > Title:A New Congestion Control in Bandwidth Guaranteed Network > > Presenter: Yingzhen Qu (Huawei) > > Time required (including Q/A): 10 mins > > Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ > > If there is any question, please kindly let us know. > > Thanks, > > Yingzhen > From nobody Sun Mar 4 12:59:09 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 279B5120727; Sun, 4 Mar 2018 12:59:02 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.699 X-Spam-Level: X-Spam-Status: No, score=-2.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id APvykZHj_yXG; Sun, 4 Mar 2018 12:59:00 -0800 (PST) Received: from mail-qk0-x232.google.com (mail-qk0-x232.google.com [IPv6:2607:f8b0:400d:c09::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CC0301201F2; Sun, 4 Mar 2018 12:58:59 -0800 (PST) Received: by mail-qk0-x232.google.com with SMTP id y137so18360527qka.4; Sun, 04 Mar 2018 12:58:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=pGE5ScbbxRhG16nt+zRu9k5qwqSwzU12FNpvTHQ9pXw=; b=Z76WE4KNyOr19jtAvTXvE2Euh56oWUyFXRzVpLzSbLzdT74X3D2Zn23pnHoBpwc6XX xugArpl7nloADUDtGIO5Sf4NRAcjS7VRHpgUBO/QklcNenPU5Hpy030wloWPPlJ0DwdL qlkANkJDsbMq74JWU85wdMBh22HaYqYIa1ufbKuKNUQcXLPPMbwPfJEYDIYEJnXSRNyO 35P67mHLFbrv6106im7GIjhgdSrg9IXGpZpTMiA7vNMklvWlt//WRI0WYKQU2hpAYiJ0 aFrFo2CCSZRyUoONgj2aLWz6vjBAskO6ZPCD3rOpeZCf1cUGnFIwLyWjl3OfKlNBdMRD yhNg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=pGE5ScbbxRhG16nt+zRu9k5qwqSwzU12FNpvTHQ9pXw=; b=eAotmaZxb5aYALU1MFTZG/kl+fIRrdezGwQgGx/94ARtgNepvbKRuywJ8zMigAHrNv 2Rz4rBKM9UP+uUY8YmipHn3InyXMd85KuaKCB0kK5EE0+BfVSr/2vQZbofFaCbsUPsus vOQNP/FS+5Yb06AY9Suc9mK1meZ3dj+/INkiuSkFK8s45R9vckzgQL6ekLDAP4Jxlk/O xXnzw5tmW0sESqqhCxrBT1TAbs9FAusyZ9lOoVHPQPn4U6phqOlbBsLsypItEz7Tkq64 hr7XICcgT88ZRhyh/3pQ3ui/13Hc7ndRu3l1kDxELaiN4WiGRgZgItDH7E9t2nEmBoZo 3N8w== X-Gm-Message-State: AElRT7H8xxjgRm0nHF6Qud/IMXTjY1wuQSdMz0SUAIwjvZX9ndSn1wdW T6KKP8fywdDwd6qNHMSwNYWViyuaRlA/00uidQ== X-Google-Smtp-Source: AG47ELu3jpS+vfX/XCZ38dntbVrHHgDtJF7rompnA6rO0KtQOcqvhjfhatUlzPbXQq6ZXEUmb36zPZw0pi9VI3X0GRg= X-Received: by 10.233.232.75 with SMTP id a72mr19382219qkg.76.1520197138791; Sun, 04 Mar 2018 12:58:58 -0800 (PST) MIME-Version: 1.0 Received: by 10.200.46.10 with HTTP; Sun, 4 Mar 2018 12:58:58 -0800 (PST) In-Reply-To: <5A9BEB65.6010102@erg.abdn.ac.uk> References: <5A9BEB65.6010102@erg.abdn.ac.uk> From: Yingzhen Qu Date: Sun, 4 Mar 2018 12:58:58 -0800 Message-ID: To: gorry@erg.abdn.ac.uk Cc: "Scharf, Michael (Nokia - DE/Stuttgart)" , Thomas Nadeau , "tcpm@ietf.org" , Yingzhen Qu , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" Content-Type: multipart/alternative; boundary="94eb2c11019a72409705669c7a12" Archived-At: Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Mar 2018 20:59:02 -0000 --94eb2c11019a72409705669c7a12 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Gorry and Michael, Thanks for the suggestion, I'll request a presentation in ICCRG. Meanwhile, I think since the in-band signaling draft was presented in TSVWG, if time allows it still makes sense to present this draft in TSVWG. The in-band signaling draft covers lots of aspects, and the required changes include network layer and transport layer. We're working on updating the draft, and may break it into pieces to fit different WGs. Your comments and help are very much appreciated. Thanks, Yingzhen On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst wrote: > I am unsure yet what the correct group of people world be to explore a > "Bandwidth Guaranteed Network". The presentation last IETF looked like th= e > work could imply a need for changes proposed to the network layer (using > OAM exchnages) to set the sending rate and make those bandwidth > reservations. In the end, it could result in a protocol quite different = to > TCP, I think this sort of change may possibly have a home in TSVWG - but > first I'd agree with Michaeland would encourage a presentation of the > problem statement in ICCRG to explore the issues. > > Gorry > > On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) wrote: > >> >> Hi all, >> >> From the abstract: =E2=80=9C=E2=80=A6This draft proposes a new TCP conge= stion control >> algorithm used in bandwidth guaranteed networks. It is an extension to = the >> current TCP standards.=E2=80=9D >> >> In the IETF, I believe the expertise for this specific document would be >> in TCPM, which in CC. If the authors are interested in feedback on the >> proposed mechanism, I would recommend to ask TCPM. >> >> Alternatively, corresponding research could perhaps be performed in the >> ICCRG. ICCRG has published RFC 6077 to document some of the open researc= h >> issues in this space. >> >> Michael >> >> *From:*tsvwg [mailto:tsvwg-bounces@ietf.org] *On Behalf Of *Yingzhen Qu >> *Sent:* Sunday, March 04, 2018 6:55 AM >> *To:* tsvwg@ietf.org; tsvwg-chairs@ietf.org >> *Cc:* Thomas Nadeau >> *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 >> >> Dear Chairs, >> >> A new draft (The draft was suggested by TSVWG @IETF100) was just >> submitted, and we=E2=80=99d like to request a time slot to present it @I= ETF101. >> >> Title:A New Congestion Control in Bandwidth Guaranteed Network >> >> Presenter: Yingzhen Qu (Huawei) >> >> Time required (including Q/A): 10 mins >> >> Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ >> >> If there is any question, please kindly let us know. >> >> Thanks, >> >> Yingzhen >> >> > --94eb2c11019a72409705669c7a12 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Gorry and Michael,

Thanks for the su= ggestion, I'll request a presentation in ICCRG. Meanwhile, I think sinc= e the in-band signaling draft was presented in TSVWG, if time allows it sti= ll makes sense to present this draft in TSVWG.=C2=A0

The in-band signaling draft covers lots of aspects, and the required cha= nges include network layer and transport layer. We're working on updati= ng the draft, and may break it into pieces to fit different WGs.
=
Your comments and help are very much appreciated.
=
Thanks,
Yingzhen

On Sun, Mar 4, 2018 at 4:49 AM, Gorry F= airhurst <gorry@erg.abdn.ac.uk> wrote:
I am unsure yet what the correct group of people world be t= o explore a "Bandwidth Guaranteed Network". The presentation last= IETF looked like the work could imply a need for changes proposed to the n= etwork layer (using OAM exchnages) to set the sending rate and make those b= andwidth reservations.=C2=A0 In the end, it could result in a protocol quit= e different to TCP, I think this sort of change may possibly have a home in= TSVWG=C2=A0 - but first I'd agree with Michaeland would encourage a pr= esentation of the problem statement in ICCRG to explore the issues.

Gorry

On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) wrote:

Hi all,

>From the abstract: =E2=80=9C=E2=80=A6This draft proposes a new TCP congesti= on control algorithm used in bandwidth guaranteed networks.=C2=A0 It is an = extension to the current TCP standards.=E2=80=9D

In the IETF, I believe the expertise for this specific document would be in= TCPM, which in CC. If the authors are interested in feedback on the propos= ed mechanism, I would recommend to ask TCPM.

Alternatively, corresponding research could perhaps be performed in the ICC= RG. ICCRG has published RFC 6077 to document some of the open research issu= es in this space.

Michael

 *From:*tsvwg [mailto:tsvwg-bounces@ietf.org] *On Behalf Of *Yingzhen Qu
*Sent:* Sunday, March 04, 2018 6:55 AM
*To:* tsvwg@ietf.org; tsvwg-chairs@= ietf.org
*Cc:* Thomas Nadeau <tnadeau@lucidvision.com>
*Subject:* [tsvwg] Agenda requests for TSVWG@IETF101

Dear Chairs,

A new draft (The draft was suggested by TSVWG @IETF100) was just submitted,= and we=E2=80=99d like to request a time slot to present it @IETF101.

Title:A New Congestion Control in Bandwidth Guaranteed Network

Presenter: Yingzhen Qu (Huawei)

Time required (including Q/A): 10 mins

Draft: https://datatracker.ietf.org/doc/dra= ft-han-tsvwg-cc/

If there is any question, please kindly let us know.

Thanks,

Yingzhen



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(mue-88-130-61-149.dsl.tropolys.de [88.130.61.149]) by virgo02.ee.ethz.ch (Postfix) with ESMTPSA; Mon, 5 Mar 2018 13:53:58 +0100 (CET) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) From: =?utf-8?Q?Mirja_K=C3=BChlewind?= In-Reply-To: Date: Mon, 5 Mar 2018 13:53:57 +0100 Cc: "draft-ietf-tcpm-accurate-ecn@ietf.org" , "tcpm@ietf.org" Content-Transfer-Encoding: quoted-printable Message-Id: <44FDECF5-A031-4343-BA1A-AE0D9C2C078C@tik.ee.ethz.ch> References: To: "Scharf, Michael (Nokia - DE/Stuttgart)" X-Mailer: Apple Mail (2.3445.5.20) Archived-At: Subject: Re: [tcpm] Comments on draft-ietf-tcpm-accurate-ecn X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Mar 2018 12:54:10 -0000 Hi Micheal, thanks for your feedback and sorry for my late reply. Please see inline. > Am 03.12.2017 um 20:17 schrieb Scharf, Michael (Nokia - DE/Stuttgart) = : >=20 > Hi all, > =20 > I have read draft-ietf-tcpm-accurate-ecn-05 (without the appendix). I = believe this document needs further work before moving forward. > =20 > Please find below my comments marked as [ms]. I have read the document = independent of the review from Gorry. I apologize if there is = duplication. > =20 > Thanks > =20 > Michael (with no hat on) > =20 > =20 > ****************************** > =20 > * Abstract: > =20 > Recently, new TCP mechanisms like Congestion Exposure (ConEx) or = Data Center TCP > (DCTCP) need more accurate ECN feedback information whenever more > than one marking is received in one RTT. > =20 > [ms] I don't think this statement is fully backed by RFC 8257. I = suggest to remove this, or replace it by a more generic statement that = more accurate information can be useful for several TCP extensions.=20 I disagree. Both ConEx and DCTCP need more accurate information. They do = not need the mechanism that is specified in this draft, however, this is = not what the sentences is saying. > =20 > This document specifies an > experimental scheme to provide more than one feedback signal per = RTT > in the TCP header. Given TCP header space is scarce, it overloads > the three existing ECN-related flags in the TCP header and provides > additional information in a new TCP option. > =20 > [ms] This statement needs to be rewritten to correctly reflect what is = requested from IANA. My understanding is that this experimental document = asks for allocation of a reserved TCP header flag. This needs to be = called out prominently, IMHO. In addition, since this is not a standard, = the suggested experimentation with the main TCP header must IMHO be = explicitly mentioned. I also suggest to have later in a document a = section that explicitly explains why it is appropriate to modify the = main TCP header in an experiment. I don=E2=80=99t know if any requirement that IANA assignment need to be = called out in the abstract but we can do that. However, I believe the = question if this document should or should not assign the bit is still = not completely solved, or is it? > =20 > =20 > * 1. Introduction > =20 > Recently, proposed mechanisms like Congestion Exposure (ConEx > [RFC7713]), DCTCP [RFC8257] or L4S [I-D.ietf-tsvwg-l4s-arch] need > more accurate ECN feedback information whenever more than one = marking > is received in one RTT. > =20 > [ms] At least for RFC 8257 seems to be implementable withoit this. = Instead of stating a "need", it would IMHO make more sense to discuss = the benefits of the suggested mechanism in this document of its own, = independent of other proposals. To me, this document should be = independent of other documents and specifically other experiments. We = have to think about cases where not all experiments are successful. Then = independent documents will be more future-proof in future. This is a naming collision=E2=80=A6 The sentence was meant to say that = these mechanisms new more accurate ECN feedback than provided today by = RFC3168 but it was not meant to say that these mechanism have to use the = scheme as specified in this document.=20 I added the following part sentence: =E2=80=9ERecently, proposed mechanisms like Congestion Exposure (ConEx = [RFC7713]), DCTCP [RFC8257] or L4S [I-D.ietf-tsvwg-l4s-arch] need more = accurate ECN feedback information than provided by the feedback scheme = as specified in [RFC3168] whenever more than one marking is received in = one RTT. This document specifies an alternative feedback scheme that = provides more accurate information and could be used by these new TCP = extensions.=E2=80=9C Does this help? > =20 > If AccECN progresses from experimental to the standards > track, it is intended to be a complete replacement for classic TCP/ > ECN feedback, not a fork in the design of TCP.=20 > =20 > [ms] This sentence should be removed, as this is speculation. Why? It states an intent=E2=80=A6 and that=E2=80=99s the intent that we = have. > =20 > Until the AccECN experiment succeeds, [RFC3168] will remain as the > standards track specification for adding ECN to TCP. > =20 > [ms] This sentence should be removed (or reworded) Why? Does it help to add an only here: "Until the AccECN experiment succeeds, [RFC3168] will remain as the only=20= standards track specification for adding ECN to TCP.=E2=80=9C ?=20 > =20 > AccECN feedback overloads flags and fields in the main TCP header > with new definitions, so both ends have to support the new wire > protocol before it can be used. > =20 > [ms] In my reading this experimental document asks for *new* = allocation of a reserved TCP header flag. Is this better? "AccECN feedback overloads the two existing ECN flags as well as the currently reserved and previously called NS flag in the main TCP = header with new definitions, so both ends have to support the new wire = protocol before it can be used.=E2=80=9C I understand that you are not happy with the word =E2=80=9Eoverload=E2=80=9C= here but the point of this sentence really is that the flags can/could = be used differently and therefore we need a new negotiation before we = can use them. If you prefer, we can also remove the NS flag in this list, as ECN Nonce = was anyway never deployed. > =20 > For that we refer to [RFC3168] or any RFC that > specifies a different response to TCP ECN feedback, for example: > [RFC8257]; or the ECN experiments referred to in > [I-D.ietf-tsvwg-ecn-experimentation], namely: a TCP-based Low = Latency > Low Loss Scalable (L4S) congestion control = [I-D.ietf-tsvwg-l4s-arch]; > ECN-capable TCP control packets [I-D.ietf-tcpm-generalized-ecn], or > Alternative Backoff with ECN (ABE) > [I-D.ietf-tcpm-alternativebackoff-ecn]. > =20 > [ms] At least ABE seems orthogonal. Anyway, I think this paragraph can = just be deleted. If other experiments need more accurate feedback, it is = up to them to explain how they would use this mechanism. This document = should focus on how to signal the feedback, not how to use that.=20 Yes, that is what the paragraph says. Isn=E2=80=99t it better to be = explicit about this? > =20 > It is likely (but not required) that the AccECN protocol will be > implemented along with the following experimental additions to the > TCP-ECN protocol: ECN-capable TCP control packets and = retransmissions > [I-D.ietf-tcpm-generalized-ecn], which includes the ECN-capable = SYN/ > ACK experiment [RFC5562]; and testing receiver non-compliance > [I-D.moncaster-tcpm-rcv-cheat]. > =20 > [ms] I am a big fan of simple, standalone documents. In my view, the = TCPM working group should publish draft-ietf-tcpm-accurate-ecn and = draft-ietf-tcpm-generalized-ecn independent documents, which probably = implies that draft-ietf-tcpm-generalized-ecn does not use AccECN. If = experimentation with ECT in SYN requires a combination, this could be = done in a new, third document. Apart from having simpler focused = documents, this could significantly help later with moving forward = documents to standards track. I disagree, however, this is a discussion to have on = draft-ietf-tcpm-generalized-ecn. I don=E2=80=99t see a problem in = providing a reference here that says =E2=80=9Eit is likely=E2=80=A6=E2=80=9C= and nothing more. >=20 > =20 > =20 > * 1.1. Document Roadmap > =20 > [ms] A macroscopic comment is that this document has a lot of = introduction and tutorial text with lot's of redundancy towards other = documents. I think the document can be made much easier to read by = shorten it. In many cases this is just an editorial change as there is = redundancy. As one such example, just remove this section. I guess this a matter of taste. As an AD, I=E2=80=99m a big fan of short = and concise documents, however, some redundancy can also help = understanding, especially if you explain things multiple times but with = a different level of detail. I personally would not need the roadmap but = I know many people who find these things helpful and to be honest I = don=E2=80=99t see how removing this part makes the doc any better. If = you don=E2=80=99t want it, don=E2=80=99t read it. > =20 > =20 > * 1.2. Goals > =20 > [ms] I think this section can also just be removed. I have to say I also don=E2=80=99t see the point of removing this part. = Given we=E2=80=99ve done the work on requirements, I think we should = also link to this doc somewhere. > =20 > =20 > * 1.3. Experiment Goals > =20 > TCP is critical to the robust functioning of the Internet, = therefore > any proposed modifications to TCP need to be thoroughly tested. The > present specification describes an experimental protocol that adds > more accurate ECN feedback to the TCP protocol. The intention is = to > specify the protocol sufficiently so that more than one > implementation can be built in order to test its function, = robustness > and interoperability (with itself and with previous version of ECN > and TCP). > =20 > [ms] I think all what is written in this paragraph is obvious, no? = Can't we just delete this? Sure, however, I don=E2=80=99t think it hurts to spell it out. For me = both is fine, keep it or remove it. > =20 > The experimental protocol will be considered successful if it is > deployed and if it satisfies the requirements of [RFC7560] in the > consensus opinion of the IETF tcpm working group. In short, this > requires that it improves the accuracy and timeliness of TCP's ECN > feedback, as claimed in Section 5, while striking a balance between > the conflicting requirements of resilience, integrity and > minimisation of overhead. It also requires that it is not unduly > complex, and that it is compatible with prevalent equipment > behaviours in the current Internet (e.g. hardware offloading and > middleboxes), whether or not they comply with standards. > =20 > Testing will mostly focus on fall-back strategies in case of > middlebox interference. Current recommended strategies are = specified > in Sections 3.1.2, 3.2.3, 3.2.4 and 3.2.7. The effectiveness of > these strategies depends on the actual deployment situation of > middleboxes. Therefore experimental verification to confirm large- > scale path traversal in the Internet is needed before finalizing = this > specification on the Standards Track. > =20 > [ms] These two paragraphs must be entirely rewritten. As I have = mentioned before, I don't think an RFC should speculate about TCPM and = its consensus opinion. I would suggest a wording along the lines of: > =20 > > The experimental protocol will be considered successful if > testing confirms that the proposed mechanism can be deployed at = large scale. > Testing will mostly focus on fall-back strategies in case of > middlebox interference. Current recommended strategies are = specified > in Sections 3.1.2, 3.2.3, 3.2.4 and 3.2.7. The effectiveness of > these strategies depends on the actual deployment situation of > middleboxes. Therefore experimental verification to confirm large- > scale path traversal in the Internet is needed, e.g., by support in > major TCP stacks. > =20 > =20 I don=E2=80=99t understand your point here. I don=E2=80=99t think that = the paraphrase speculates about the consensus of tcpm, in contrast it = say tcpm has to decided if the requirements previously specified by tcpm = are sufficiently fulfilled. I don=E2=80=99t see a reason to not mention = the requirement draft as this draft as tcpm consensus and was written = for this purpose. > =20 > * 1.5. Recap of Existing ECN feedback in IP/TCP > =20 > [ms] This section could probably be shortened as well. > =20 > The last bit in byte 13 of the TCP header was defined as the Nonce > Sum (NS) for the ECN Nonce [RFC3540]. RFC 3540 was never deployed = so > it is being reclassified as historic, making this TCP flag = available > for use by the AccECN experiment instead. > =20 > [ms] This wording, as well as Figure 1, needs to take into account the = IANA status when draft-ietf-tsvwg-ecn-experimentation is published. Is does. However, I can explicitly say that is has be re-clssified as = reserved. "RFC 3540 was never deployed so it is being reclassified as historic = [I-D.ietf-tsvwg-ecn-experimentation] and the respective flag has been = marked as =E2=80=9Ereserved=E2=80=9C in the IANA TCP Header Flags registry, making this TCP flag available = for use by the AccECN experiment instead.=E2=80=9C Better? > In my understanding, this experimental document asks for new = assignment of a reserved TCP header flag. As I said I=E2=80=99m not sure if we have fully concluded this = discussion yet. However, what we really would want to is mention = somewhere that this experiment with this flags is running. I guess there = are three options:=20 1) keep it in the registry as reserved and conserve the knowledge in = tcpm that this experiment is running and no other experimental RFC such = use this flags as long as this experiment is running.=20 2) Keep is marked as reserved but add a note about this experiment in = the IANA registry 3) Or assign it right away with IESG approval. I guess in this case tcpm = could also consider to change the registration policy to =E2=80=9EIETF = Review=E2=80=9C. > =20 > =20 > * 2. AccECN Protocol Overview and Rationale > =20 > o an essential part that re-uses ECN TCP header bits to feed back > the number of arriving CE marked packets. This provides more > accuracy than classic ECN feedback, but limited resilience = against > ACK loss; > =20 > [ms] The word "re-use" is IMHO not correct. I think this is nit picking. Using a different phrasing here makes the = sentence unnecessary complicated. We don=E2=80=99t try to some how get a = round the fact that we need to handle the flag registration correctly. = However, here the point really is to explain how the protocol word. The = main point of using the work =E2=80=9Ere-use=E2=80=9C here is really = that we say that these flags are or have been used different by other = TCP extension (and we therefore need a proper negotiation scheme). > =20 > The two part design was necessary, given limitations on the space > available for TCP options and given the possibility that certain > incorrectly designed middleboxes prevent TCP using any new options. > =20 > [ms] IMHO it would make sense to more explicitly mention the downsides = of only specifying an option and not allocating a TCP header flag, in = this experimental document. We need to use the flags (all three of them) for the negotiation. > The obvious alternative would be to postpone the header flag = allocation to a follow-up standards track document and just keep it = reserved. We can still do that. We should discuss and make a final decision. > =20 > The essential part overloads the previous definition of the three > flags in the TCP header that had been assigned for use by ECN. = This > design choice deliberately replaces the classic ECN feedback > protocol, rather than leaving classic ECN feedback intact and = adding > more accurate feedback separately because: > =20 > [ms] Similar like previous comments, in my reading there are only = _two_ ECN header flags. I think there are three flags that "had been assigned for use by ECN=E2=80= =9C as ECN Nonce is also an ECN mechanism. The fact that one of the = flags is now marked as reserved instead, it not that important for me = here. > And, in addition, I think care is needed with wording such "replaces = the classic ECN feedback". I don't think this experiment replaces the = ECN standards. That would be up to a follow-up PS. This sentence is not meant to say that RFC3168 is replaced. Actually we = don=E2=80=99t. You can still use RFC3168 even if AccECN is implemented = and deploy (however, we do intent that AccECN will be used as the = default scheme in future and RFC3168 is hopefully simply not needed = anymore at some point, even though you probably still need to have it = implemented as the negotiation specified in this draft covers that as = well, anyway...). The sentence says that if AccECN is negotiation, the = header flags as used by RFC3168 and previously ECN Nonce are used = differently (aka re-used). That=E2=80=99s all. > =20 > =20 > 2.1. Capability Negotiation > =20 > AccECN is a change to the wire protocol of the main TCP header, > therefore it can only be used if both endpoints have been upgraded = to > understand it. The TCP client signals support for AccECN on the > initial SYN of a connection and the TCP server signals whether it > supports AccECN on the SYN/ACK. The TCP flags on the SYN that the > client uses to signal AccECN support have been carefully chosen so > that a TCP server will interpret them as a request to support the > most recent variant of ECN feedback that it supports. Then the > client falls back to the same variant of ECN feedback. > =20 > [ms] As this is an experimental specification, I would really like to = see a discussion how a future standards track version of more accurate = ECN could be negotiated. As described in this draft. There will be no different. AccECN IS and = will always be backward compatible with RFC3168. > How could both endpoints detect whether the other one implements the = future standards track version? If the initiator implements AccECN it will request it=E2=80=99s use. If = the receiver also implement it, it will/can negotiate it, if not it will = look like an RFC3168 request for the receiver (as the NS flags will be = ignored in the SYN) and it will negotiate RFC3168 ECN feedback if = implemented. There is no additional detection needed. > For instance, would the only safe variant be that we allocate yet = another reserved TCP header flag in a proposed standard to negotiate the = standards track version, thus investing another reserved bit in the TCP = header? No, that=E2=80=99s exactly what we use the NS flags for in the = handshake. > I may be wrong, but to me it is too early to speculate how the PS = version would look like, and whether it would have to be different to = the experimental version, due to lessons learnt. Of course you can always be wrong. However, the handshake negotiation is = not the part we need experimentation for. That part is straight forward = and works. If we really happen to detect a problem in that part, we = would need to end the experiment declare failure and start over new. > I believe in the IETF we typically design protocols that allow future = extension, and it is not exactly clear to be how AccECN could be = extended later. This is an TCP extension. If we want future extension we use the usually = TCP mechanism (by defining a new TCP option I guess). > =20 > An AccECN TCP client does not send the new AccECN Option on the SYN > as SYN option space is limited and successful negotiation using the > flags in the main header is taken as sufficient evidence that both > ends also support the AccECN Option. The TCP server sends the = AccECN > Option on the SYN/ACK and the client sends it on the first ACK to > test whether the network path forwards the option correctly. > =20 > [ms] For what it is worth, I would personally be quite fine with = allowing (or even mandating) an option in the SYN in the experimental = version of this protocol. For instance, saving the SYN option space = would then an excellent reason for moving towards the PS specification. = I am also fine with being in the rough part of the consensus here. The point is that we really don=E2=80=99t need the option in the SYN as = we don=E2=80=99t use it for negotiation purposes as we use the header = bits instead. So why should we waste the space? > * 2.3. Delayed ACKs and Resilience Against ACK Loss > =20 > If the AccECN Option is not available, e.g. it is being stripped by = a > middlebox, the AccECN protocol will only feed back information on = CE > markings (using the ACE field). Although not ideal, this will be > sufficient, because it is envisaged that neither ECT(0) nor ECT(1) > will ever indicate more severe congestion than CE, even though = future > uses for ECT(0) or ECT(1) are still unclear > [I-D.ietf-tsvwg-ecn-experimentation]. > =20 > [ms] This needs to be reworded Why? > =20 > =20 > =20 > * 2.4. Feedback Metrics > =20 > The CE packet counter in the ACE field and the CE byte counter in = the > AccECN Option both provide feedback on received CE-marks. The CE > packet counter includes control packets that do not have payload > data, while the CE byte counter solely includes marked payload = bytes. > If both are present, the byte counter in the option will provide = the > more accurate information needed for modern congestion control and > policing schemes, such as DCTCP or ConEx. > =20 > [ms] I suggest to write in the last sentence only "... the option will = provide the more accurate information needed for congestion control". In = general, I would prefer to have references to other mechanisms at only = few (ideally a *single*) places in the document, instead of mixing them = together. Sorry, I don=E2=80=99t see your point here. ConEx has been mentioned = previously, so why not also mention it here. > Feedback in bytes is recommended in order to protect against the > receiver using attacks similar to 'ACK-Division' to artificially > inflate the congestion window, which is why [RFC5681] now = recommends > that TCP counts acknowledged bytes not packets. > =20 > [ms] At least the last part and the reference to RFC 5681 is IMHO not = needed here. Why? RFC5681 explains/refers the ACK division attack, so I think it is a = very good reference to have here.=20 > =20 > =20 > =20 > * 2.5. Generic (Dumb) Reflector > =20 > The ACE field provides information about CE markings on both data = and > control packets. According to [RFC3168] the Data Sender is meant = to > set control packets to Not-ECT. However, mechanisms in certain > private networks (e.g. data centres) set control packets to be ECN > capable because they are precisely the packets that performance > depends on most. > =20 > For this reason, AccECN is designed to be a generic reflector of > whatever ECN markings it sees, whether or not they are compliant = with > a current standard. Then as standards evolve, Data Senders can > upgrade unilaterally without any need for receivers to upgrade too. > It is also useful to be able to rely on generic reflection = behaviour > when senders need to test for unexpected interference with markings > (for instance [I-D.kuehlewind-tcpm-ecn-fallback] and > [I-D.moncaster-tcpm-rcv-cheat]). > =20 > The initial SYN is the most critical control packet, so AccECN > provides feedback on whether it is CE marked. Although RFC 3168 > prohibits an ECN-capable SYN, providing feedback of CE marking on = the > SYN supports future scenarios in which SYNs might be ECN-enabled > (without prejudging whether they ought to be). For instance, > [I-D.ietf-tsvwg-ecn-experimentation] updates this aspect of RFC = 3168 > to allow experimentation with ECN-capable TCP control packets. > =20 > [ms] To me, the only thing that matters in this document that AccECN = can provide feedback on whether the SYN is CE marked. The discussion on = how to experiment with ECT e.g. in SYNs IMHO does not belong into this = document. So it seems sufficient here to note that one of the benefits = of AccECN is that CE marks in SYNs can be fed back. I disagree. Explicitly saying that AccECN is only an feedback scheme and = DOES NOT define how the information is used is VERY important because = people come back to me over and over again and mix these things up. > =20 > =20 > * 3.1.1. Negotiation during the TCP handshake > =20 > Given the ECN Nonce [RFC3540] is being reclassified as historic, = the > present specification renames the TCP flag at bit 7 of the TCP = header > flags from NS (Nonce Sum) to AE (Accurate ECN) (see IANA > Considerations in Section 6). > =20 > [ms] As mentioned before, this needs to be rewritten to ask for new = IANA allocation of bit 7 in the TCP header flags. I really don=E2=80=99t understand this comment. That is what the IANA = section does as referred here correctly. Again, yes, we can discuss if this document should do this, but if = published as it is, section 6 says everything that is needs to say. (I = does not put any request on IANA, instead it is written as it would show = up post-publication, implicitly providing a request to IANA at approval = time. That is fine.) > =20 > Table 2: ECN capability negotiation between Client (A) and Server = (B) > =20 > [ms] As far as I can see, in -05 this table allocates all existing = codepoints, while -03 had two currently unused codepoints. Not having = any codepoints left seems to me not really future proof, e.g., regarding = future proposed standards in this space (and I personally believe that = TCP header flags must be allocated in a PS). And I don't fully see a = need of feeding back ECT0 and specifically ECT1 in the TCP header flags = as part of the experiment. Do we know for sure that this is the only = possible use case of these two unallocated header bits? And why can't = e.g. this be done in a TCP option instead? Or do I miss something? The point is really, if we don=E2=80=99t assign them now and start = deployment we effetely we not be able to every assign them again because = don=E2=80=99t have a different negotiation mechanisms. Realizing this, = it is just the right think to define the space completely that is = negotiated as use for AccECN in the handshake. =20 > =20 > =20 > * 3.1.2. Retransmission of the SYN > =20 > However, > current measurements imply that a drop is less likely to be due to > middlebox interference than other intermittent causes of loss, e.g. > congestion, wireless interference, etc. > =20 > [ms] Such wording IMHO doesn't belong into normative text. This may = actually also apply to other heuristics discussed in this section, which = are not really important for interoperability. I don=E2=80=99t really understand your point. This sentence is solely = meant to reason the design decision to not say that a sender SHOULD = attempt to re-negotiation after a loss. =20 > =20 > =20 > 3.2.7. Path Traversal of the AccECN Option > =20 > 3.2.7.1. Testing the AccECN Option during the Handshake > =20 > The TCP client MUST NOT include the AccECN TCP Option on the SYN. > =20 > [ms] I am not sure if I really understand the motivation for not = allowing a option in the SYN. If the sender has space in the SYN left, = what is the harm in an experimental version of the protocol? And I may = miss something, but what would prevent the use of 2-byte option to = negotiate the use of AccECN, e.g., to avoid experimental allocation of = bit 7 in the initial SYN? I did have a draft on that as a proposal for an alternative design. = However, the gourd was more supportive of this design as it is proof of = middlebox SYN option mangling which is a know problem. Therefore we simply don=E2=80=99t need option in the SYN and there is no = reason to waste the space.=20 > While I think many tutorial text in this document could be shortened, = I believe the use of a reserved TCP header flag should be reasoned. I=E2=80=99m actually uncertain what you expect here.=20 > =20 > =20 > * 3.2.8. Usage of the AccECN TCP Option > =20 > The following rules determine when a Data Receiver in AccECN mode > sends the AccECN TCP Option, and which fields to include: > =20 > Change-Triggered ACKs: If an arriving packet increments a = different > byte counter to that incremented by the previous packet, the = Data > Receiver MUST immediately send an ACK with an AccECN Option, > without waiting for the next delayed ACK (this is in addition to > the safety recommendation in Section 3.2.5 against ambiguity of > the ACE field). > =20 > This is stated as a "MUST" so that the data sender can rely on > change-triggered ACKs to detect transitions right from the very > start of a flow, without first having to detect whether the > receiver complies. A concern has been raised that certain = offload > hardware needed for high performance might not be able to = support > change-triggered ACKs, although high performance protocols such = as > DCTCP successfully use change-triggered ACKs. > =20 > [ms] To me this sounds like a perfect example for a SHOULD with = additional guidance why implementing this SHOULD is really important. This is one of the most discussed point from the author and we really = tried to get additional guidance here of what to do also from outside = the IETF but did no clear feedback.=20 As explained this MUST enables additional functionality. However, this = is an experiment document. If we detect that this MUST does actually = hinder implementation or has just never been implemented, we should = reconsider this in the final PS RFC. I was on the SHOULD side of the discussion, but can say that the = implementation in Linux was way more simple then expected. Offloading = might be a different topic but that is where I could not get a clear = feedback and offloading could probably be anyway optimized for use with = AccECN (if it gets deploy widely).=20 I though we added this as something to mention in the exp goals section, = but obviously we didn=E2=80=99t. I added the following text now: "Another experimentation focus is the implementation feasibiliy of = change-triggered ACKs as described in section 3.2.8. While on average = this should not lead to a higher ACK rate, it changes the ACK patter = which especially can have an impact on hardware offload. Further = experimentation is needed to advise if this should a hard requirement or = just prefer behavior.=E2=80=9C > =20 > For the avoidance of doubt, the change-triggered ACK mechanism is > deliberately worded to ignore the arrival of a control packet with = no > payload, which therefore does not alter any byte counters, because = it > is important that TCP does not acknowledge pure ACKs. The change- > triggered ACK approach will lead to some additional ACKs but it = feeds > back the timing and the order in which ECN marks are received with > minimal additional complexity. > =20 > [ms] The additional acks create network load. I think some wording is = needed on the tradeoff between information accuracy and network load. = There are network environments in which any additional packet is very = expensive (e.g., energy) and it is not clear to me how the protocol = design takes into account the potential overhead of additional ACKs. = Maybe this could be another reason for a SHOULD. The above. However, this is not really an additional ACK because you do = delay the next one. Further experimentation needed. > =20 > =20 > * 4.2. Compatibility with Other TCP Options and Experiments > =20 > AccECN is compatible (at least on paper) with the most commonly = used > TCP options: MSS, time-stamp, window scaling, SACK and TCP-AO. It = is > also compatible with the recent promising experimental TCP options > TCP Fast Open (TFO [RFC7413]) and Multipath TCP (MPTCP [RFC6824]). > =20 > [ms] I would suggest the wording "... compatible with the experimental = TCP options ..." or even "... compatible with the TCP options =E2=80=A6". These option are to experimental..? The point of using =E2=80=9Ecommonly used=E2=80=9C was to say that we = checked on those as they seem important. Just because your favorite = experiment option is not listed here it doesn=E2=80=99t means it = incompatible, we just didn=E2=80=99t check. I=E2=80=99m okay to removed = =E2=80=9Ecommonly used=E2=80=9C but I don=E2=80=99t think it makes = anything better. =20 > =20 > * 4.3. Compatibility with Feedback Integrity Mechanisms > =20 > [ms] Quite a bit in this section is experimental work, which IMHO = should be clearly emphasized. The one exception is=E2=80=A6 I would really like to keep this section because integrity is usually = the fist question that come up when I present AccECN. Effectively these = are two independent topics, however, I really think it help people to = understand the whole picture if this is also discussed in this document. > =20 > However, TCP-AO is often too brittle to use on many end-to-end > paths, where middleboxes can make verification fail in their > attempts to improve performance or security, e.g. by > resegmentation or shifting the sequence space. > =20 > [ms] I am not sure if deployment challenges of other options need to = be discussed in this document. If we keep the discussion, I guess we should mention this as well. As = the doc clearly stated section 4 is not meant to be normative. > =20 > Originally the ECN Nonce [RFC3540] was proposed to ensure integrity > of congestion feedback. With minor changes AccECN could be = optimised > for the possibility that the ECT(1) codepoint might be used as an = ECN > Nonce . However, given RFC 3540 is being reclassified as historic, > the AccECN design has been generalised so that it ought to be able = to > support other possible uses of the ECT(1) codepoint, such as a = lower > severity or a more instant congestion signal than CE. > =20 > [ms] The discussion of RFC 3540 can probably be removed to a large = extent. Unfortunately, please still think that ECN Nonce, even though is was = never deployed and doesn=E2=80=99t really work, is the only was to = provide integrity protection and we need it as a prerequisite to deploy = ECN at all=E2=80=A6 i would really prefer to keep this in this = non-normative part of the doc. > =20 > =20 > * 6. IANA Considerations > =20 > [ms] I think this section needs to be rewritten to request a new = allocation of bit 7 of the TCP header flags. At least for the process I = think it would make sense to have somewhere in the document a = comprehensive explanation of why an experimental document requests a = change of the main TCP header, and why this cannot be avoided (most = notably in the initial SYN) by an alternative protocol design. As I said previously this section is written as it would look like after = the allocation has happened with publication approval of the IESG. This = is fine. Having a discussion about an experiment doc assigning a flag (or not) is = a question for tcpm as a whole and not specifically this document. How = do we envision to every use any further flags? We go to PS right away? = Or should we change the registration policy? For me the latter makes = actually more sense. However, if we don=E2=80=99t want/can to decide = this now, we also could go forward as it is with IESG approval. However, = is this case it is also not needed to explain this in the document. The = responsible AD has to explain this to the other IESG probably in the = ballot or even better the shepherd could provide these information in = the write-up. > =20 > =20 > * 9. Comments Solicited > =20 > Comments and questions are encouraged and very welcome. They can = be > addressed to the IETF TCP maintenance and minor modifications = working > group mailing list , and/or to the authors. > =20 > [ms] This section is not needed IMHO Yes, it will be removed before publication.=20 > =20 > =20 > 10. References > =20 > [I-D.ietf-tsvwg-ecn-experimentation] > Black, D., "Relaxing Restrictions on Explicit Congestion > Notification (ECN) Experimentation", = draft-ietf-tsvwg-ecn- > experimentation-07 (work in progress), October 2017. > =20 > [ms] Normative reference? Don=E2=80=99t see why. No need to read ietf-tsvwg-ecn-experimentation to = understand the spec in this doc. Thanks! Mirja From nobody Mon Mar 5 06:10:09 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 35D0012DA13 for ; Mon, 5 Mar 2018 06:09:59 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.909 X-Spam-Level: X-Spam-Status: No, score=-1.909 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FFdeBgNiheJi for ; Mon, 5 Mar 2018 06:09:55 -0800 (PST) Received: from virgo02.ee.ethz.ch (virgo02.ee.ethz.ch [129.132.72.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CD07F12DA25 for ; Mon, 5 Mar 2018 06:09:54 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by virgo02.ee.ethz.ch (Postfix) with ESMTP id 3zw1xs3P25z15M7g; Mon, 5 Mar 2018 15:09:53 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at virgo02.ee.ethz.ch Received: from virgo02.ee.ethz.ch ([127.0.0.1]) by localhost (virgo02.ee.ethz.ch [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nsoL8QON0zqK; Mon, 5 Mar 2018 15:09:51 +0100 (CET) X-MtScore: NO score=0 Received: from [192.168.133.28] (mue-88-130-61-149.dsl.tropolys.de [88.130.61.149]) by virgo02.ee.ethz.ch (Postfix) with ESMTPSA; Mon, 5 Mar 2018 15:09:51 +0100 (CET) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) From: =?utf-8?Q?Mirja_K=C3=BChlewind?= In-Reply-To: <5A128116.9080609@erg.abdn.ac.uk> Date: Mon, 5 Mar 2018 15:09:50 +0100 Cc: tcpm@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: <0C9DF549-632F-4FAC-A561-3C3679552C6E@tik.ee.ethz.ch> References: <5A128116.9080609@erg.abdn.ac.uk> To: gorry@erg.abdn.ac.uk X-Mailer: Apple Mail (2.3445.5.20) Archived-At: Subject: Re: [tcpm] Detailed review of AccECN rev -04 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Mar 2018 14:10:02 -0000 Hi Gorry, say for your feedback. Please see below. > Am 20.11.2017 um 08:15 schrieb Gorry Fairhurst : >=20 > tcpm@ietf.org >=20 > I've read the -04 rev of teh above ID, and I have the following = comments for the TCPM WG. >=20 > Overall, >=20 > * This document reads well, and seems mature. >=20 > * There are several references to other IETF activities, and the text = concerning these appears to need to be revised before this is ready to = proceed. See below. >=20 > * Since this document was adopted, work on ECN++ appears to have = become inter-twined with this ID. I did not find this helpful, and made = comments on ECN++ today that voiced this concern and requested we = consider as a WG to best frame the proposed modification on the TCP SYN = permitting ECT(?) to be set. See comment (6). >=20 > * I wonder if this document updates any other RFCs - I'd assume not - = but it may if a future work proceeds along the standards track. I think = it would be good to specifically identify in one section of the intro = what these implications are. > For instance: > - The discussion of ECN on SYN is predecated by ECN-Experimentation = (targeting publication as PS) > - The discussion of ECN on SYN has implications on ECN++, which = recommends AccECN is implemented. This document does NOT enable ECN on SYN. However, it does specify how = to provide feedback on what was observed in the SYN (also because = middleboxes might remark wrongly). These are two independent things. > - A future standards-track document based on the AccECN experimental = RFC could update RFC3168. No, I don=E2=80=99t it would update RFC3168. It does not change anything = in that RFC. It also specified an additional meachismen (which we hope = will deploy as the default). The only thing we change is the use of the = NS bit in the SYN but that was previously unused; with or without ECN = Nonce. > - etc. I don=E2=80=99t think there is any update. I thin we=E2=80=99ve been = trying to be careful about that. >=20 > * The document may intend a proposed change to RFC 5681 (4.2. = Generating Acknowledgments). See comment (8). I also don=E2=80=99t think so because RFC5681 says "The delayed ACK = algorithm specified in [RFC1122] SHOULD be used by a TCP receiver.=E2=80=9C= and not MUST. And delay ACK SHOULD still because but there are further = things to consider. >=20 > Gorry >=20 > --- >=20 > Some more specific comments on the text in the -04 AccECN draft: >=20 > (1) The introduction - "until the AccECN experiment suceeds, [RFC3168] = will remain as the standards track specification for adding ECN to TCP." > - This seems odd. I think this is not the case: > Quite simply: "RFC3168 defines the current TCP feedback method." > - It may be you think a future standards-track document based on the = AccECN experimental RFC could update RFC3168, that is possible, but = there is no need for an EXP to make that direct claim against as PS. I added any =E2=80=9Eonly=E2=80=9C here based on Micheal=E2=80=99s = comment: "Until the AccECN experiment succeeds, [RFC3168] will remain as the only standards track specification for adding ECN to = TCP.=E2=80=9C This sentenced was just mention to introduce the term =E2=80=9Eclassic = ECN=E2=80=9C. It was not meant to say anything about a status change of = RFC3168, which we also do plan to do as explained to Micheal. AccECN is = implicitly backward compatible to ECN therefore even AccECN as PS will = not change, nor update anything that is said in RFC3168.=20 >=20 > (2) Section 1.5. First para. (On loss v drop using ECN) > - I'd feel happier also noting that a router implementing AQM is still = allowed to drop packets marked as ECT() when this is needed - and you = could refer to the BCP to say so: /RFC/7567. I didn=E2=80=99t think the section say anything else. Also this is just = the ECN recap=E2=80=A6 This says: "When a network node experiences congestion, it will occasionally either drop or mark a packet, with the choice depending on the packet's ECN codepoint. If the codepoint is Not- ECT, only drop is appropriate. If the codepoint is ECT(0) or ECT(1), the node can mark the packet by setting both ECN bits,=E2=80=A6=E2=80=9C= So it explicitly say =E2=80=9Emark or drop=E2=80=9C and =E2=80=9Ecan = mark=E2=80=9C... >=20 > (3) Section 1.5. Last para. > - Please remove the discussion of Nonce from here! I think it is still important to mention that this bit is not assigned = completely newish but has been assigned for ECN purported previously. = Based on Micheal=E2=80=99s comment I added a reference to the ecn-exp = draft and explicitly say that NS has been marked as =E2=80=9Erevered=E2=80= =9C. > - It is OK simply to refer to the PS specifying ECN Experimentation - = or the process document to do this. > - If it is really necessary to discuss this, please use the form of = words expressed in that draft, rather than saying "was never = deployed=E2=80=9C. Done. Now it says "In the absence of widespread deployment RFC 3540 has been reclassified = as historic [RFC8311]." >=20 > (4) Section 3.1.1 > "is being reclassified as historic." > - Again this text is now out-of-date, see comment (3). s/is being/has been/ >=20 > (5) Section 3.1.1, ECN Nonce. > - This definition also contains text later that say "does not = need...". It's not that it doesn't need, more that the IETF has changed = the use of this field. I think it would be easy to simply remove this = definition - but the WG wants to keep it please align the text precisely = with the ECN Experimentation draft. The last para of section 4 repeats = this and has the smae problem. Good catch. Changed to=20 "With AccECN implementation, there is no need to for the ECN Nonce = feedback mode [RFC3540], which has also been reclassified as historic = [RFC8311], as AccECN is compatible with an alternative ECN feedback = integrity approach=E2=80=A6" Does that work for you? >=20 > (6) Section 3.1.2. ECN on SYN > - This section seems to be a variant of the section expressed in the = ECN++ draft (sect 4.2). That draft rather awkwardly refers back to thsi = draft recommending AccECN is implemented - but the two specs differ. Section 3.1.2? Not sure what you mean=E2=80=A6 However, we have been to only specify a feedback scheme (that includes = SYN feedback) and not say anything about when or if to use ECN (in = general not only for the SYN). Please let me know if that is anywhere = not the case.=20 >=20 > I do encourage the WG to think about where the update on ECN for SYN = is best described. As I just said we clearly want to separate feedback and usage of ECN as = this is also one of the problems with RFC3168. > There are specific issues for experimentation and for cahcing in ECN++ = and other issues here. I'd like a cleaner spec so that **IF** there are = results from the experiments we know how to then publish a PS and = declare the experiment as historic. At the moment this seems awkard. I think the nice part of this separation is actually that AccECN is = independent of the results of the ECN++ experiments. >=20 > - Section 3.2.7.2 is also about the SYN negotiation. And similar to = ECN++. I don=E2=80=99t know where the ECN+ doc says anything about negotiation. = negoation and option fallback belongs in this doc. Setting and testing = of the IP ECN codepoint below in ECN++. >=20 > (7) Section 3.2.3 (First segment after SYN) > - TCP segments can be re-ordered, so saying the "first segment after = SYN" should (I think) probably be the segment numbered after the SYN = segment - noting that this is not necessarily the next segment received = (in time order). I don=E2=80=99t see where this is written. Actually the text says:=20 "More precisely, the "first segment with SYN=3D0" is defined as: the segment with SYN=3D0 that i) acknowledges sequence space at least covering the initial sequence number (ISN) plus 1; and ii) arrives before any other segments with SYN=3D0 so it = is unlikely to be a retransmission.=E2=80=9C >=20 > (8) Section 3.2.5 > - The modified delayed ACK policy stated here is an experimental = update to the IETF recommended procedure in a PS (RFC5681, 4.2. = Generating Acknowledgments). I think it is important that the change is = referenced back to this RFC. The proposed change could have implications = on the capacity used for the ACK stream - and this should be noted. I disagree as explained above. >=20 > (9) RFC2119: Section 3.2.7.1, para 1 > - The ID says the client MUST NOT include the AccECN option on the = SYN. What does a server do that receives such an option? I guess as long as the option is correct, there is no problem and = therefore no further specification is needed; it would be treated like = every other AccECN option. Not sure if that needs to be explicitly = mentioned... >=20 > (10) RFC2119: Section 3.2.7.1, para 2 > - "A TCP server that confirms its support ... SHOULD also" > - I couldn't parse that sentence... Is that to imply there are valid = reasons why the server could be implemented in a way that does not do = this? (That doesn't seem to be explained). Yes, it's the endpoints decision to use options at all. If it does not = want to support feedback in options it should not send it in the = SYN/ACK. I just realized that this not stated anyway explicitly, so I = added a sentence at the end of in section 3.2.6.: "The use of the AccECN option is optional for the Data Receiver. If the = Data Receiver intents to use the AccECN option at any time during the = rest of the connection it strongly recommended to also test its path = traversal by including it in the SYN/ACK as specified in the next = section. By default the use of the AccECN option is RECOMMENDED.=E2=80=9C > - What is the meaning of "also" here. Does that mean the support is = already confirmed in some other way? (I'm not sure also after SHOULD is = a helpful construction of a clause). This referred to in addition to the information provided in the ACE = field. But I just removed the =E2=80=9Ealso". >=20 > (11) RFC2119: Section 3.2.7.1, para 3 > - I think the sentence starting "A TCP Client" also contains two = SHOULD clauses without saying what are the conditions for not doing = this. I think it is often wiser to start these sort of clauses by = saying something like this order to avoid this: >=20 > ... A host that receives an AccECN option SHOULD respond by returning = the AccECN option in the first ACK at the end of the 3WHS. ... There are = three cases when the host could decide not to =E2=80=A6 No this is not the intention here. Option travel may be independent in = both direction and should be tested independently. >=20 > When the TCP client returns the ECN option, it SHOULD also include an = AccECN option on the first data segment it sends... This is to ensure = that... >=20 > (12) RFC2119: Please also avoid "MAY NOT" as a construct, since this = can be mis-interpretted by different varients of English usage. What else would we say? This is the correctly RFC2119 language.=20 >=20 > (13) Section 3.3 appears to make string normative requirements (MUST) = on the operation of middleboxes. This may be the intention, but if so, I = think it would be much wider to then make this evident in the section = title and the document introduction. Yes, that is intended. I renamed the section to=20 "Requirements for TCP Proxies, Offload Engines and other Middleboxes on = AccECN Compliance=E2=80=9C Does that help? >=20 > (14) RFC2119: Section 3.3 appears to make mixed normative requirements = (MUST attempt) on offload. I don't know what that means. I think this = could be equivalent to "SHOULD" with an explanation of WHY this is so = needed (which is sort of there). s/MUST attempt to/SHOULD/ Also added =E2=80=9E=E2=80=A6 as these can be used by the Data Sender to infer = further information about the path congestion level.=E2=80=9C >=20 > (15) Section 3.3 on offload. > - If this is intended to change offload behaviour, I think it needs a = separate section to say this, mentioned in the intro, otherewise people = implementing offload will not see and read this. Not really. How offload works with AccECN is a question I often get. My = current understanding is that everything likely would still work but be = less effective (at least when there are high level of path congestion). = I would expect that is AccECN gets widely deployed offloading could be = further optimized but there doesn=E2=80=99t see to be an urgent need = now. However, knowing if what I actually said is all true, might also be = part of the experiment=E2=80=A6 >=20 > (16) Section 4, Section 5, Appendix A, intro. > - You could remove (not normative) to be even clearer. I don=E2=80=99t really see a point in removing these parts. As there are = non-normative this obviously says that the spec would still be complete = without them, however, I think the still have some useful information = and I don=E2=80=99t the what we gain by removing them=E2=80=A6? >=20 > (17) For the avoidance of doubt it may be wise to state the standards = status of the TCP AO and Conex work... e.g., "TCP AO is a = standards-track method to =E2=80=A6" Where should we do that? Mirja >=20 > Best wishes, >=20 > Gorry >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm From nobody Mon Mar 5 07:07:29 2018 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 3040F12711D; Mon, 5 Mar 2018 07:07:22 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: internet-drafts@ietf.org To: Cc: tcpm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.74.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <152026244215.14567.14697977806288342851@ietfa.amsl.com> Date: Mon, 05 Mar 2018 07:07:22 -0800 Archived-At: Subject: [tcpm] I-D Action: draft-ietf-tcpm-accurate-ecn-06.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Mar 2018 15:07:22 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF. Title : More Accurate ECN Feedback in TCP Authors : Bob Briscoe Mirja Kühlewind Richard Scheffenegger Filename : draft-ietf-tcpm-accurate-ecn-06.txt Pages : 43 Date : 2018-03-05 Abstract: Explicit Congestion Notification (ECN) is a mechanism where network nodes can mark IP packets instead of dropping them to indicate incipient congestion to the end-points. Receivers with an ECN- capable transport protocol feed back this information to the sender. ECN is specified for TCP in such a way that only one feedback signal can be transmitted per Round-Trip Time (RTT). Recently,ew TCP mechanisms like Congestion Exposure (ConEx) or Data Center TCP (DCTCP) need more accurate ECN feedback information whenever more than one marking is received in one RTT. This document specifies an experimental scheme to provide more than one feedback signal per RTT in the TCP header. Given TCP header space is scarce, it overloads the three existing ECN-related flags in the TCP header and provides additional information in a new TCP option. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-06 https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn-06 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-ecn-06 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon Mar 5 10:16:43 2018 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id DB9371267BB; Mon, 5 Mar 2018 10:16:41 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: tcpm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.74.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <152027380186.14624.8843516061240272538@ietfa.amsl.com> Date: Mon, 05 Mar 2018 10:16:41 -0800 Archived-At: Subject: [tcpm] I-D Action: draft-ietf-tcpm-converters-01.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Mar 2018 18:16:42 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF. Title : 0-RTT TCP Convert Protocol Authors : Olivier Bonaventure Mohamed Boucadair Bart Peirens SungHoon Seo Anandatirtha Nandugudi Filename : draft-ietf-tcpm-converters-01.txt Pages : 37 Date : 2018-03-05 Abstract: This document specifies an application proxy, called Transport Converter, to assist the deployment of TCP extensions such as Multipath TCP. This proxy is designed to avoid inducing extra delay when involved in a network-assisted connection (that is, 0-RTT). This specification assumes an explicit model, where the proxy is explicitly configured on hosts. -- Editorial Note (To be removed by RFC Editor) Please update these statements with the RFC number to be assigned to this document: [This-RFC] Please update TBA statements with the port number to be assigned to the Converter Protocol. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-tcpm-converters-01 https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-converters-01 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-converters-01 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon Mar 5 15:11:57 2018 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id AF4DF126BFD; Mon, 5 Mar 2018 15:11:50 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: tcpm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.74.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <152029151070.12715.15497200993114582811@ietfa.amsl.com> Date: Mon, 05 Mar 2018 15:11:50 -0800 Archived-At: Subject: [tcpm] I-D Action: draft-ietf-tcpm-rack-03.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Mar 2018 23:11:51 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF. Title : RACK: a time-based fast loss detection algorithm for TCP Authors : Yuchung Cheng Neal Cardwell Nandita Dukkipati Priyaranjan Jha Filename : draft-ietf-tcpm-rack-03.txt Pages : 25 Date : 2018-03-05 Abstract: This document presents a new TCP loss detection algorithm called RACK ("Recent ACKnowledgment"). RACK uses the notion of time, instead of packet or sequence counts, to detect losses, for modern TCP implementations that can support per-packet timestamps and the selective acknowledgment (SACK) option. It is intended to replace the conventional DUPACK threshold approach and its variants, as well as other nonstandard approaches. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-tcpm-rack/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-tcpm-rack-03 https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-rack-03 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rack-03 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Tue Mar 6 10:38:33 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CDE4212D944 for ; Tue, 6 Mar 2018 10:38:28 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6-cSvaC6q4eS for ; Tue, 6 Mar 2018 10:38:26 -0800 (PST) Received: from fgont.go6lab.si (fgont.go6lab.si [IPv6:2001:67c:27e4::14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0893F12DA23 for ; Tue, 6 Mar 2018 10:38:25 -0800 (PST) Received: from [192.168.3.68] (unknown [186.138.211.87]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by fgont.go6lab.si (Postfix) with ESMTPSA id 1D0F080EFC; Tue, 6 Mar 2018 19:38:22 +0100 (CET) From: Fernando Gont To: "tcpm@ietf.org" References: <152029339529.12825.5038413838558267392.idtracker@ietfa.amsl.com> Message-ID: <3edad22d-d6ed-31ea-cfc8-26b04b10de3e@si6networks.com> Date: Tue, 6 Mar 2018 15:38:08 -0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <152029339529.12825.5038413838558267392.idtracker@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [tcpm] Flaw in RFC793 (Fwd: New Version Notification for draft-gont-tcpm-tcp-seq-validation-03.txt) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Mar 2018 18:38:32 -0000 Folks, There is bug in the TCP Sequence Number validation algorithm from RFC793. Most major implementations have addressed it, but the bug still remains in our specs. We got a bit of extra energy to try to get this one fixed. Our I-D (draft-gont-tcpm-tcp-seq-validation) is available at the usual repository. We have incorporated some minor edits done after the cut-off here: -- but modulo minor grammar corrections, version -03 is the same. We'd like to receive feedback from the wg regarding the "problem statement" (so to speak), and the proposed/described fixes. Thanks! Cheers, Fernando -------- Forwarded Message -------- Subject: New Version Notification for draft-gont-tcpm-tcp-seq-validation-03.txt Date: Mon, 05 Mar 2018 15:43:15 -0800 From: internet-drafts@ietf.org To: Fernando Gont , David Borman A new version of I-D, draft-gont-tcpm-tcp-seq-validation-03.txt has been successfully submitted by Fernando Gont and posted to the IETF repository. Name: draft-gont-tcpm-tcp-seq-validation Revision: 03 Title: On the Validation of TCP Sequence Numbers Document date: 2018-03-05 Group: Individual Submission Pages: 16 URL: https://www.ietf.org/internet-drafts/draft-gont-tcpm-tcp-seq-validation-03.txt Status: https://datatracker.ietf.org/doc/draft-gont-tcpm-tcp-seq-validation/ Htmlized: https://tools.ietf.org/html/draft-gont-tcpm-tcp-seq-validation-03 Htmlized: https://datatracker.ietf.org/doc/html/draft-gont-tcpm-tcp-seq-validation-03 Diff: https://www.ietf.org/rfcdiff?url2=draft-gont-tcpm-tcp-seq-validation-03 Abstract: When TCP receives packets that lie outside of the receive window, the corresponding packets are dropped and either an ACK, RST or no response is generated due to the out-of-window packet, with no further processing of the packet. Most of the time, this works just fine and TCP remains stable, especially when a TCP connection has unidirectional data flow. However, there are three scenarios in which packets that are outside of the receive window should still have their ACK field processed, or else a packet war will take place. The aforementioned issues have affected a number of popular TCP implementations, typically leading to connection failures, system crashes, or other undesirable behaviors. This document describes the three scenarios in which the aforementioned issues might arise, and formally updates RFC 793 such that these potential problems are mitigated. Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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boundary="Apple-Mail=_476E887B-3E5E-4367-9790-F4A3D201BB8D"; protocol="application/pgp-signature"; micalg=pgp-sha512 MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: ae2ccf62-684f-4cdb-8403-08d583953927 X-MS-Exchange-CrossTenant-originalarrivaltime: 06 Mar 2018 19:05:27.3174 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4b0911a0-929b-4715-944b-c03745165b3a X-MS-Exchange-Transport-CrossTenantHeadersStamped: BLUPR06MB852 X-OriginatorOrg: netapp.com Archived-At: Subject: Re: [tcpm] Flaw in RFC793 (Fwd: New Version Notification for draft-gont-tcpm-tcp-seq-validation-03.txt) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Mar 2018 19:05:32 -0000 --Apple-Mail=_476E887B-3E5E-4367-9790-F4A3D201BB8D Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi, isn't this something that could simply go into 793bis, after there is = consensus that something needs to be fixed? Lars On 2018-3-6, at 19:38, Fernando Gont wrote: >=20 > Folks, >=20 > There is bug in the TCP Sequence Number validation algorithm from > RFC793. Most major implementations have addressed it, but the bug = still > remains in our specs. >=20 > We got a bit of extra energy to try to get this one fixed. Our I-D > (draft-gont-tcpm-tcp-seq-validation) is available at the usual = repository. >=20 > We have incorporated some minor edits done after the cut-off here: > = > -- but modulo minor grammar corrections, version -03 is the same. >=20 > We'd like to receive feedback from the wg regarding the "problem > statement" (so to speak), and the proposed/described fixes. >=20 > Thanks! >=20 > Cheers, > Fernando >=20 >=20 >=20 >=20 > -------- Forwarded Message -------- > Subject: New Version Notification for > draft-gont-tcpm-tcp-seq-validation-03.txt > Date: Mon, 05 Mar 2018 15:43:15 -0800 > From: internet-drafts@ietf.org > To: Fernando Gont , David Borman > >=20 >=20 > A new version of I-D, draft-gont-tcpm-tcp-seq-validation-03.txt > has been successfully submitted by Fernando Gont and posted to the > IETF repository. >=20 > Name: draft-gont-tcpm-tcp-seq-validation > Revision: 03 > Title: On the Validation of TCP Sequence Numbers > Document date: 2018-03-05 > Group: Individual Submission > Pages: 16 > URL: > = https://www.ietf.org/internet-drafts/draft-gont-tcpm-tcp-seq-validation-03= .txt > Status: > https://datatracker.ietf.org/doc/draft-gont-tcpm-tcp-seq-validation/ > Htmlized: > https://tools.ietf.org/html/draft-gont-tcpm-tcp-seq-validation-03 > Htmlized: > = https://datatracker.ietf.org/doc/html/draft-gont-tcpm-tcp-seq-validation-0= 3 > Diff: > = https://www.ietf.org/rfcdiff?url2=3Ddraft-gont-tcpm-tcp-seq-validation-03 >=20 > Abstract: > When TCP receives packets that lie outside of the receive window, = the > corresponding packets are dropped and either an ACK, RST or no > response is generated due to the out-of-window packet, with no > further processing of the packet. Most of the time, this works just > fine and TCP remains stable, especially when a TCP connection has > unidirectional data flow. However, there are three scenarios in > which packets that are outside of the receive window should still > have their ACK field processed, or else a packet war will take = place. > The aforementioned issues have affected a number of popular TCP > implementations, typically leading to connection failures, system > crashes, or other undesirable behaviors. This document describes = the > three scenarios in which the aforementioned issues might arise, and > formally updates RFC 793 such that these potential problems are > mitigated. >=20 >=20 >=20 >=20 > Please note that it may take a couple of minutes from the time of = submission > until the htmlized version and diff are available at tools.ietf.org. >=20 > The IETF Secretariat >=20 >=20 >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm --Apple-Mail=_476E887B-3E5E-4367-9790-F4A3D201BB8D Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEmpq0ZpSoejRmyhheVLXDCb9wwVcFAlqe5nYACgkQVLXDCb9w wVeuIhAAxm9L1phNQpsyVsFRIt1gblrff3atZDf4AXUed3UIgX+NJ4if6xQgyzQh AMKOwAJFl9SvaoLM1x5fqPm6IlhlnmhMun3XYSPiZynm4BM0z0nj1Xd5SJM8eT8O +lbsO0XRof7MeSnofMqzQX7KDTzVOW+36snrNNXIAU7k4ACF8yNqZSB/SFwGy5zS ew2R2uR/MPS5HscOEXlOXiap32P4ZW/bq3NPGc4vvZGYfypFtdJetuebS7KvN8Te 0CwBcud/dFqIJtadv2RnsI3hCEzwE9pQ2dNbDh4Y1TxpwO76MDxBuL0itDa/NpY/ dlzkvXlMGegTvdkpNNvcAwxeOY8Hwp6VBV+m0c/xd8Nf2T1NnIZ/MNkYDNEmiypz UtqW5y15LiVFncFwIW8gLkiT9veXXYDxXpjclQ1Df4wiHr043oiGW3T/+lwkFl4e teA9YTSPfS9YgvLsVtn3spnbrxOtKDQbdYbw4ArL0fYUK31MVOuUfvV9/DqRGWjO N5fl34V7/lyz6JsmbbsR/z/RXCY0Z9TvslFAjvC635/37gOEgnu3FGCOSXwRa3Rr VIvNox7ZzcC2NBSgMSUpTRrvXY4yN0G2J1lUJ27yl888QGp31E3S68WlvS4Ehtg3 HMOwdB9mgVBy1y6foYXJu62IzCuoAY4+whh9W8FbnJCwFY2GUdI= =DAaM -----END PGP SIGNATURE----- --Apple-Mail=_476E887B-3E5E-4367-9790-F4A3D201BB8D-- From nobody Tue Mar 6 12:22:40 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3E5B712AF83 for ; Tue, 6 Mar 2018 12:22:38 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id evpzoLnIlBAR for ; Tue, 6 Mar 2018 12:22:36 -0800 (PST) Received: from fgont.go6lab.si (fgont.go6lab.si [91.239.96.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 034F8126BF3 for ; Tue, 6 Mar 2018 12:22:36 -0800 (PST) Received: from [192.168.3.68] (unknown [186.138.211.87]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by fgont.go6lab.si (Postfix) with ESMTPSA id 1462286387; Tue, 6 Mar 2018 21:22:31 +0100 (CET) To: "Eggert, Lars" Cc: "tcpm@ietf.org" References: <152029339529.12825.5038413838558267392.idtracker@ietfa.amsl.com> <3edad22d-d6ed-31ea-cfc8-26b04b10de3e@si6networks.com> From: Fernando Gont Message-ID: Date: Tue, 6 Mar 2018 17:18:28 -0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [tcpm] Flaw in RFC793 (Fwd: New Version Notification for draft-gont-tcpm-tcp-seq-validation-03.txt) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Mar 2018 20:22:38 -0000 Hello, Lars, On 03/06/2018 04:05 PM, Eggert, Lars wrote: > Hi, > > isn't this something that could simply go into 793bis, after there is consensus that something needs to be fixed? (me thinking out loud) Dunno. My understanding was the rfc793bis was only taking documents that had already formally updated rfc793. A "feature" of that is that the rationale for the changes incoporated in rfc793bis are documented in the updating documents, and rfc793bis doesn't need to delve too much into such rationales, or explain the changes -- just incorporate them. What's in draft-gont-tcpm-tcp-seq-validation is certainly necessary to illustrate where RFC793 fails. But I doubt you'd like the time-sequence diagrams of all these corner-cases in RFC793bis. But you'd also like to have something that you can point to explain these changes (even more, if different popular implementations decided to address this in a different way). One possible way would be to add all this to an Appendix in RFC793. But I guess that would warrant to do the same for other stuff (e.g., update for the TCP URG mechanism). Thanks! Cheers, -- Fernando Gont SI6 Networks e-mail: fgont@si6networks.com PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492 From nobody Tue Mar 6 13:53:23 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F0F29124B17 for ; Tue, 6 Mar 2018 13:53:21 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.65 X-Spam-Level: X-Spam-Status: No, score=-1.65 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, HTML_OBFUSCATE_05_10=0.26, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 94fNIVepLvtC for ; Tue, 6 Mar 2018 13:53:19 -0800 (PST) Received: from mail.sfc.wide.ad.jp (shonan.sfc.wide.ad.jp [203.178.142.130]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EBF771204DA for ; Tue, 6 Mar 2018 13:53:18 -0800 (PST) Received: from mail-wr0-f172.google.com (mail-wr0-f172.google.com [209.85.128.172]) by mail.sfc.wide.ad.jp (Postfix) with ESMTPSA id DBD90278721 for ; Wed, 7 Mar 2018 06:53:16 +0900 (JST) Received: by mail-wr0-f172.google.com with SMTP id l43so149306wrc.2 for ; Tue, 06 Mar 2018 13:53:16 -0800 (PST) X-Gm-Message-State: APf1xPBDyZdOUoLq5fAczHkaCO1w1sZk4l1lwQ75PtTut3jNJ2oq66GW FMeSpGkZtCgwAhaVyhtKgDYspHgX7qhQkA7VEGc= X-Google-Smtp-Source: AG47ELtCdLMRFqJ1OgqsOK8UfVfyHTjQsvOjvK4nBpkn9sKl4ryuyaRkMRdSFCEuNvzm0W2iXsrSl1PVrlR8jP6LnnY= X-Received: by 10.223.185.112 with SMTP id b45mr17119208wrg.159.1520373194962; Tue, 06 Mar 2018 13:53:14 -0800 (PST) MIME-Version: 1.0 Received: by 10.223.129.200 with HTTP; Tue, 6 Mar 2018 13:53:14 -0800 (PST) In-Reply-To: References: <152029339529.12825.5038413838558267392.idtracker@ietfa.amsl.com> <3edad22d-d6ed-31ea-cfc8-26b04b10de3e@si6networks.com> From: Yoshifumi Nishida Date: Tue, 6 Mar 2018 13:53:14 -0800 X-Gmail-Original-Message-ID: Message-ID: To: "Eggert, Lars" Cc: Fernando Gont , "tcpm@ietf.org" Content-Type: multipart/alternative; boundary="f403045fa4c6363dba0566c578ef" Archived-At: Subject: Re: [tcpm] Flaw in RFC793 (Fwd: New Version Notification for draft-gont-tcpm-tcp-seq-validation-03.txt) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Mar 2018 21:53:22 -0000 --f403045fa4c6363dba0566c578ef Content-Type: text/plain; charset="UTF-8" Hello, On Tue, Mar 6, 2018 at 11:05 AM, Eggert, Lars wrote: > Hi, > > isn't this something that could simply go into 793bis, after there is > consensus that something needs to be fixed? > I think the observation of the bug can go into 793bis (which has been done in the current version). However, I think the solution for it needs to be reviewed and discussed. It will be really great if some implementers speak up if the solution in the draft looks good or they take different approach to address the issue. -- Yoshi > > On 2018-3-6, at 19:38, Fernando Gont wrote: > > > > Folks, > > > > There is bug in the TCP Sequence Number validation algorithm from > > RFC793. Most major implementations have addressed it, but the bug still > > remains in our specs. > > > > We got a bit of extra energy to try to get this one fixed. Our I-D > > (draft-gont-tcpm-tcp-seq-validation) is available at the usual > repository. > > > > We have incorporated some minor edits done after the cut-off here: > > tcpm-tcp-seq-validation-04.txt> > > -- but modulo minor grammar corrections, version -03 is the same. > > > > We'd like to receive feedback from the wg regarding the "problem > > statement" (so to speak), and the proposed/described fixes. > > > > Thanks! > > > > Cheers, > > Fernando > > > > > > > > > > -------- Forwarded Message -------- > > Subject: New Version Notification for > > draft-gont-tcpm-tcp-seq-validation-03.txt > > Date: Mon, 05 Mar 2018 15:43:15 -0800 > > From: internet-drafts@ietf.org > > To: Fernando Gont , David Borman > > > > > > > > A new version of I-D, draft-gont-tcpm-tcp-seq-validation-03.txt > > has been successfully submitted by Fernando Gont and posted to the > > IETF repository. > > > > Name: draft-gont-tcpm-tcp-seq-validation > > Revision: 03 > > Title: On the Validation of TCP Sequence Numbers > > Document date: 2018-03-05 > > Group: Individual Submission > > Pages: 16 > > URL: > > https://www.ietf.org/internet-drafts/draft-gont-tcpm-tcp-seq > -validation-03.txt > > Status: > > https://datatracker.ietf.org/doc/draft-gont-tcpm-tcp-seq-validation/ > > Htmlized: > > https://tools.ietf.org/html/draft-gont-tcpm-tcp-seq-validation-03 > > Htmlized: > > https://datatracker.ietf.org/doc/html/draft-gont-tcpm-tcp-se > q-validation-03 > > Diff: > > https://www.ietf.org/rfcdiff?url2=draft-gont-tcpm-tcp-seq-validation-03 > > > > Abstract: > > When TCP receives packets that lie outside of the receive window, the > > corresponding packets are dropped and either an ACK, RST or no > > response is generated due to the out-of-window packet, with no > > further processing of the packet. Most of the time, this works just > > fine and TCP remains stable, especially when a TCP connection has > > unidirectional data flow. However, there are three scenarios in > > which packets that are outside of the receive window should still > > have their ACK field processed, or else a packet war will take place. > > The aforementioned issues have affected a number of popular TCP > > implementations, typically leading to connection failures, system > > crashes, or other undesirable behaviors. This document describes the > > three scenarios in which the aforementioned issues might arise, and > > formally updates RFC 793 such that these potential problems are > > mitigated. > > > > > > > > > > Please note that it may take a couple of minutes from the time of > submission > > until the htmlized version and diff are available at tools.ietf.org. > > > > The IETF Secretariat > > > > > > > > _______________________________________________ > > tcpm mailing list > > tcpm@ietf.org > > https://www.ietf.org/mailman/listinfo/tcpm > > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm > > --f403045fa4c6363dba0566c578ef Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hello,

On Tue, Mar 6, 2018 at 11:05 AM, Eggert, Lars &= lt;lars@netapp.com= > wrote:
Hi,

isn't this something that could simply go into 793bis, after there is c= onsensus that something needs to be fixed?

<= div>I think the observation of the bug can go into 793bis (which has been d= one in the current version).=C2=A0
However, I think the solution = for it needs to be reviewed and discussed.=C2=A0

I= t will be really great if some implementers speak up if the solution in the= draft looks good or they take different approach to address the issue.
--
Yoshi



On 2018-3-6, at 19:38, Fernando Gont <fgont@si6networks.com> wrote:
>
> Folks,
>
> There is bug in the TCP Sequence Number validation algorithm from
> RFC793. Most major implementations have addressed it, but the bug stil= l
> remains in our specs.
>
> We got a bit of extra energy to try to get this one fixed. Our I-D
> (draft-gont-tcpm-tcp-seq-validation) is available at the usual re= pository.
>
> We have incorporated some minor edits done after the cut-off here:
> <ht= tps://www.si6networks.com/publications/drafts/draft-gont-tcpm-tcp= -seq-validation-04.txt>
> -- but modulo minor grammar corrections, version -03 is the same.
>
> We'd like to receive feedback from the wg regarding the "prob= lem
> statement" (so to speak), and the proposed/described fixes.
>
> Thanks!
>
> Cheers,
> Fernando
>
>
>
>
> -------- Forwarded Message --------
> Subject: New Version Notification for
> draft-gont-tcpm-tcp-seq-validation-03.txt
> Date: Mon, 05 Mar 2018 15:43:15 -0800
> From: in= ternet-drafts@ietf.org
> To: Fernando Gont <fgont@si6networks.com>, David Borman
> <davi= d.borman@quantum.com>
>
>
> A new version of I-D, draft-gont-tcpm-tcp-seq-validation-03.txt > has been successfully submitted by Fernando Gont and posted to the
> IETF repository.
>
> Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-gont-tcpm-tcp-seq-validation
> Revision:=C2=A0 =C2=A0 =C2=A003
> Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 On the V= alidation of TCP Sequence Numbers
> Document date:=C2=A0 =C2=A0 =C2=A0 =C2=A0 2018-03-05
> Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individu= al Submission
> Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 16
> URL:
> https://www.ietf.= org/internet-drafts/draft-gont-tcpm-tcp-seq-validation-03.txt=
> Status:
> https://datatracker.ietf.or= g/doc/draft-gont-tcpm-tcp-seq-validation/
> Htmlized:
> https://tools.ietf.org/html/dr= aft-gont-tcpm-tcp-seq-validation-03
> Htmlized:
> https://datatracker.= ietf.org/doc/html/draft-gont-tcpm-tcp-seq-validation-03
> Diff:
> https://www.ietf.org/r= fcdiff?url2=3Ddraft-gont-tcpm-tcp-seq-validation-03
>
> Abstract:
>=C2=A0 =C2=A0When TCP receives packets that lie outside of the receive = window, the
>=C2=A0 =C2=A0corresponding packets are dropped and either an ACK, RST o= r no
>=C2=A0 =C2=A0response is generated due to the out-of-window packet, wit= h no
>=C2=A0 =C2=A0further processing of the packet.=C2=A0 Most of the time, = this works just
>=C2=A0 =C2=A0fine and TCP remains stable, especially when a TCP connect= ion has
>=C2=A0 =C2=A0unidirectional data flow.=C2=A0 However, there are three s= cenarios in
>=C2=A0 =C2=A0which packets that are outside of the receive window shoul= d still
>=C2=A0 =C2=A0have their ACK field processed, or else a packet war will = take place.
>=C2=A0 =C2=A0The aforementioned issues have affected a number of popula= r TCP
>=C2=A0 =C2=A0implementations, typically leading to connection failures,= system
>=C2=A0 =C2=A0crashes, or other undesirable behaviors.=C2=A0 This docume= nt describes the
>=C2=A0 =C2=A0three scenarios in which the aforementioned issues might a= rise, and
>=C2=A0 =C2=A0formally updates RFC 793 such that these potential problem= s are
>=C2=A0 =C2=A0mitigated.
>
>
>
>
> Please note that it may take a couple of minutes from the time of subm= ission
> until the htmlized version and diff are available at tools.ietf.org. >
> The IETF Secretariat
>
>
>
> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm

_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm


--f403045fa4c6363dba0566c578ef-- From nobody Tue Mar 6 19:18:03 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 97A9B126B72 for ; Tue, 6 Mar 2018 19:18:02 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.898 X-Spam-Level: X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=mti-systems-com.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2vY43LQPJ2Kn for ; Tue, 6 Mar 2018 19:18:01 -0800 (PST) Received: from mail-pg0-x234.google.com (mail-pg0-x234.google.com [IPv6:2607:f8b0:400e:c05::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 30A92124BE8 for ; Tue, 6 Mar 2018 19:18:01 -0800 (PST) Received: by mail-pg0-x234.google.com with SMTP id l131so393786pga.2 for ; Tue, 06 Mar 2018 19:18:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mti-systems-com.20150623.gappssmtp.com; s=20150623; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language; bh=dv3uw6/e3PnizsFfasrT7ZyiKPgqLOXP10L+xrrBBPo=; b=GbzkG26FQDVvr9YV3WDHysr7hcqchvCXCpn7kdiKmdXhb5MqiMb/++H7YExd0AKI3+ jfdWzyinV0UJTbQhGyOAplz6mtagBzegHrzVXVgVkG6cQdpe7C2OkJ2cW5n5cusZsg5n Reu3heHA01D13yo64qomG5Sf7fd0PlFH4V1K1PARqVo9YHs/HmLwWDaBWwuwv8o/AI8y 8xJu1VOwaTRkW6Agntus41c0Hf649hSlfK7ok0Z6pci2NoEdM9nFU8BUHlPr5D4tVDfL nGInbQT32Mv9uKpg1lNrcVoZpFUwohY+Cz/wgNTD86NmSNkcwg4WeHqHdMjWZMxAFzU5 Av7w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language; bh=dv3uw6/e3PnizsFfasrT7ZyiKPgqLOXP10L+xrrBBPo=; b=l6UgBrKyfPIglBdrCjuoDkDKTHHkLQmrOfXx50urZ48yB+vlssOa/pP14nqYwvLIY9 YfuyNhTUmERFMHj6QpidvhnCuKfagWd7AXd7rOm5cOZCSnzU2t62iS6Pj7ShHdfOuhvq km+cH68eVlg6abQel5rew+lDCCtH3euGDBGQQ24DZ0dY13ZIHP1WtStq9QlXLb5lFIGS zxz7AHtUBLKecmSjDcqRekUlvXiSUCjGr40XUtG3tywZ2K1U2oMftOWOfsPB9Cey/0yj jI9ZUCwsne9zznqPn0SEG3tF7NwaW01W2C6tjdgksjeEi5iixP5ErtUOSwhWBjmzUtg5 +iEg== X-Gm-Message-State: APf1xPCtPoyBQpDh9GgnULCiBnEkyEjIimJW6/h86Jr6QwwDbEYKrRmo Vy2znLhzvppbQMBH6rlYxaP/GHRs3T4= X-Google-Smtp-Source: AG47ELuXVEZIw8GGFJZBpxOm45A8MBVFIL6co5KEFoeiJjU6Zzs6zHMLXDqxQz6DpYSCSukkAE5vaA== X-Received: by 10.98.155.93 with SMTP id r90mr21213523pfd.132.1520392680489; Tue, 06 Mar 2018 19:18:00 -0800 (PST) Received: from [172.20.15.100] ([65.154.215.98]) by smtp.gmail.com with ESMTPSA id i2sm26699879pgp.88.2018.03.06.19.17.59 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 06 Mar 2018 19:18:00 -0800 (PST) To: tcpm@ietf.org References: <152029339529.12825.5038413838558267392.idtracker@ietfa.amsl.com> <3edad22d-d6ed-31ea-cfc8-26b04b10de3e@si6networks.com> From: Wesley Eddy Message-ID: <7ef9427f-3f12-9dd1-3d86-1135ce28c9cf@mti-systems.com> Date: Tue, 6 Mar 2018 22:17:57 -0500 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------36981A4D800623AE68C42EE9" Content-Language: en-US Archived-At: Subject: Re: [tcpm] Flaw in RFC793 (Fwd: New Version Notification for draft-gont-tcpm-tcp-seq-validation-03.txt) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Mar 2018 03:18:02 -0000 This is a multi-part message in MIME format. --------------36981A4D800623AE68C42EE9 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit On 3/6/2018 4:53 PM, Yoshifumi Nishida wrote: > Hello, > > On Tue, Mar 6, 2018 at 11:05 AM, Eggert, Lars > wrote: > > Hi, > > isn't this something that could simply go into 793bis, after there > is consensus that something needs to be fixed? > > > I think the observation of the bug can go into 793bis (which has been > done in the current version). > However, I think the solution for it needs to be reviewed and discussed. > FYI - there is a paragraph on the issue in Appendix A of the current revision, which was added after discussion around the Chicago meeting (IIRC).  I think if no solution is blessed by the working group, that this warning about a "known bug" would be the best we can do in 793bis, but is certainly far less desirable than having an actual solution in the body of the document.  To work that solution out, discuss the options, etc., I'm in favor of advancing it via the draft Fernando and David have put together.  They already briefly discuss the Linux approach, for instance. > It will be really great if some implementers speak up if the solution > in the draft looks good or they take different approach to address the > issue. Agreed; feedback is useful, though I do think this bug is evident and we at least can see what has evidently been done about it already in open source stacks, as examples. --------------36981A4D800623AE68C42EE9 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit On 3/6/2018 4:53 PM, Yoshifumi Nishida wrote:
Hello,

On Tue, Mar 6, 2018 at 11:05 AM, Eggert, Lars <lars@netapp.com> wrote:
Hi,

isn't this something that could simply go into 793bis, after there is consensus that something needs to be fixed?

I think the observation of the bug can go into 793bis (which has been done in the current version). 
However, I think the solution for it needs to be reviewed and discussed. 



FYI - there is a paragraph on the issue in Appendix A of the current revision, which was added after discussion around the Chicago meeting (IIRC).  I think if no solution is blessed by the working group, that this warning about a "known bug" would be the best we can do in 793bis, but is certainly far less desirable than having an actual solution in the body of the document.  To work that solution out, discuss the options, etc., I'm in favor of advancing it via the draft Fernando and David have put together.  They already briefly discuss the Linux approach, for instance.


It will be really great if some implementers speak up if the solution in the draft looks good or they take different approach to address the issue.

Agreed; feedback is useful, though I do think this bug is evident and we at least can see what has evidently been done about it already in open source stacks, as examples.


--------------36981A4D800623AE68C42EE9-- From nobody Wed Mar 7 09:21:31 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1265A126D45 for ; Wed, 7 Mar 2018 09:21:29 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id j4cxStEm00rD for ; Wed, 7 Mar 2018 09:21:27 -0800 (PST) Received: from drew.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 78D5D1200C1 for ; Wed, 7 Mar 2018 09:21:27 -0800 (PST) Received: from [IPv6:2003:cd:6bc4:bb00:c99f:dff5:deb6:bd9f] (p200300CD6BC4BB00C99FDFF5DEB6BD9F.dip0.t-ipconnect.de [IPv6:2003:cd:6bc4:bb00:c99f:dff5:deb6:bd9f]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTPSA id C6400721E281A for ; Wed, 7 Mar 2018 18:21:24 +0100 (CET) From: Michael Tuexen Content-Type: multipart/signed; boundary="Apple-Mail=_F556FAC9-99D6-419F-8BA2-974FFF5763FC"; protocol="application/pkcs7-signature"; micalg=sha1 Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) Message-Id: <078F08F7-B6DE-412C-948F-06DC922F875E@fh-muenster.de> Date: Wed, 7 Mar 2018 18:21:23 +0100 To: tcpm@ietf.org X-Mailer: Apple Mail (2.3445.5.20) Archived-At: Subject: [tcpm] Preliminary Agenda Uploaded X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Mar 2018 17:21:29 -0000 --Apple-Mail=_F556FAC9-99D6-419F-8BA2-974FFF5763FC Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii Dear all, please find the preliminary agenda for the TCPM meeting in London at https://datatracker.ietf.org/meeting/101/materials/agenda-101-tcpm If you have suggestions for changes, please let us know. Looking forward to seeing you in London! Best regards Michael --Apple-Mail=_F556FAC9-99D6-419F-8BA2-974FFF5763FC Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIQkDCCBNUw ggO9oAMCAQICCFBOxvU9EbRkMA0GCSqGSIb3DQEBCwUAMHExCzAJBgNVBAYTAkRFMRwwGgYDVQQK ExNEZXV0c2NoZSBUZWxla29tIEFHMR8wHQYDVQQLExZULVRlbGVTZWMgVHJ1c3QgQ2VudGVyMSMw IQYDVQQDExpEZXV0c2NoZSBUZWxla29tIFJvb3QgQ0EgMjAeFw0xNDA3MjIxMjA4MjZaFw0xOTA3 MDkyMzU5MDBaMFoxCzAJBgNVBAYTAkRFMRMwEQYDVQQKEwpERk4tVmVyZWluMRAwDgYDVQQLEwdE Rk4tUEtJMSQwIgYDVQQDExtERk4tVmVyZWluIFBDQSBHbG9iYWwgLSBHMDEwggEiMA0GCSqGSIb3 DQEBAQUAA4IBDwAwggEKAoIBAQDpm8NnhfkNrvWNVMOWUDU9YuluTO2U1wBblSJ01CDrNI/W7MAx BAuZgeKmFNJSoCgjhIt0iQReW+DieMF4yxbLKDU5ey2QRdDtoAB6fL9KDhsAw4bpXCsxEXsM84Ik Q4wcOItqaACa7txPeKvSxhObdq3u3ibo7wGvdA/BCaL2a869080UME/15eOkyGKbghoDJzANAmVg Te3RCSMqljVYJ9N2xnG2kB3E7f81hn1vM7PbD8URwoqDoZRdQWvY0hD1TP3KUazZve+Sg7va64sW 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autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nYFzThotw9LP for ; Wed, 7 Mar 2018 22:31:29 -0800 (PST) Received: from fgont.go6lab.si (fgont.go6lab.si [IPv6:2001:67c:27e4::14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0E187126E01 for ; Wed, 7 Mar 2018 22:31:29 -0800 (PST) Received: from [192.168.3.68] (unknown [186.138.211.87]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by fgont.go6lab.si (Postfix) with ESMTPSA id 0D2BB86391; Thu, 8 Mar 2018 07:31:24 +0100 (CET) To: Yoshifumi Nishida , "Eggert, Lars" Cc: "tcpm@ietf.org" , David Borman References: <152029339529.12825.5038413838558267392.idtracker@ietfa.amsl.com> <3edad22d-d6ed-31ea-cfc8-26b04b10de3e@si6networks.com> From: Fernando Gont Message-ID: Date: Thu, 8 Mar 2018 02:59:19 -0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [tcpm] Flaw in RFC793 (Fwd: New Version Notification for draft-gont-tcpm-tcp-seq-validation-03.txt) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Mar 2018 06:31:31 -0000 On 03/06/2018 06:53 PM, Yoshifumi Nishida wrote: > > It will be really great if some implementers speak up if the solution in > the draft looks good or they take different approach to address the issue. Dave Borman (co-author) is an implementer. I have asked other implementers to provide input. Thanks, -- Fernando Gont SI6 Networks e-mail: fgont@si6networks.com PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492 From nobody Sun Mar 11 14:19:07 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 73E83126D45 for ; Sun, 11 Mar 2018 14:19:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.001 X-Spam-Level: X-Spam-Status: No, score=-1.001 tagged_above=-999 required=5 tests=[BAYES_20=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=-1, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=nokia.onmicrosoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, 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Version Notification for draft-gont-tcpm-tcp-seq-validation-03.txt) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 11 Mar 2018 21:19:06 -0000 --_000_AM5PR0701MB2547292247EDD22BF9BBF1F793DC0AM5PR0701MB2547_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGF2aW5nIGEgc21hbGwgZG9jdW1lbnQgdGhhdCBwcmVjaXNlbHkgZGVzY3JpYmVzIHRoZSBpc3N1 ZSBhbmQgc29sdXRpb25zIHNlZW1zIHVzZWZ1bCB0byBtZS4gSSB0aGluayBpdCBpcyBlYXNpZXIg dG8gZGlzY3VzcyBhbmQgcmV2aWV3IGEgZGVkaWNhdGVkIGRvY3VtZW50IHRoYW4gYWRkaW5nIGNo YW5nZXMgb25seSBpbiA3OTNiaXMuDQoNClNvLCBpbiBteSBwZXJzb25hbCB2aWV3LCBldmVuIGFu IChpbmZvcm1hdGlvbmFsKSBkb2N1bWVudCB0aGF0IGp1c3QgZGVzY3JpYmVzIHRoZSBwcm9ibGVt IGFuZCBrbm93biBzb2x1dGlvbnMgd291bGQgYmUgYmV0dGVyIHRoYW4gaGF2aW5nIHRvIHNvcnQg 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ZXhwZXJpbWVudGF0aW9uXQ0KPiA+ICAgICAgICAgICAgICAgQmxhY2ssIEQuLCAiUmVsYXhpbmcg UmVzdHJpY3Rpb25zIG9uIEV4cGxpY2l0IENvbmdlc3Rpb24NCj4gPiAgICAgICAgICAgICAgIE5v dGlmaWNhdGlvbiAoRUNOKSBFeHBlcmltZW50YXRpb24iLCBkcmFmdC1pZXRmLXRzdndnLWVjbi0N Cj4gPiAgICAgICAgICAgICAgIGV4cGVyaW1lbnRhdGlvbi0wNyAod29yayBpbiBwcm9ncmVzcyks IE9jdG9iZXIgMjAxNy4NCj4gPg0KPiA+IFttc10gTm9ybWF0aXZlIHJlZmVyZW5jZT8NCj4gDQo+ IERvbuKAmXQgc2VlIHdoeS4gTm8gbmVlZCB0byByZWFkIGlldGYtdHN2d2ctZWNuLWV4cGVyaW1l bnRhdGlvbiB0bw0KPiB1bmRlcnN0YW5kIHRoZSBzcGVjIGluIHRoaXMgZG9jLg0KPiANCj4gVGhh bmtzIQ0KPiBNaXJqYQ0KPiANCg0K From nobody Mon Mar 12 13:28:59 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E5DD912704A; Mon, 12 Mar 2018 13:28:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.96 X-Spam-Level: X-Spam-Status: No, score=-3.96 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GcJtarUBKWAI; Mon, 12 Mar 2018 13:28:45 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 119A3129515; Mon, 12 Mar 2018 13:28:44 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [131.188.34.77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id C862658C500; Mon, 12 Mar 2018 21:28:40 +0100 (CET) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id AF359B0DCE8; Mon, 12 Mar 2018 21:28:40 +0100 (CET) Date: Mon, 12 Mar 2018 21:28:40 +0100 From: Toerless Eckert To: "Scharf, Michael (Nokia - DE/Stuttgart)" Cc: Yingzhen Qu , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" , Thomas Nadeau , "tcpm@ietf.org" Message-ID: <20180312202840.GA25534@faui40p.informatik.uni-erlangen.de> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: [tcpm] draft-han-tsvwg-cc (was: Re: [tsvwg] Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Mar 2018 20:28:51 -0000 Thanks, Michael, On Sun, Mar 04, 2018 at 10:34:29AM +0000, Scharf, Michael (Nokia - DE/Stuttgart) wrote: > In the IETF, I believe the expertise for this specific document would be in TCPM, which in CC. If the authors are interested in feedback on the proposed mechanism, I would recommend to ask TCPM. TCPM might be actually a good idea, and that WG's feedback would be highly welcome. Let me send a separate email to the chairs and ask if they could consider presenting this in TCPM. > From the abstract: ?????? This draft proposes a new TCP congestion control algorithm used in bandwidth guaranteed networks. It is an extension to the current TCP standards.??? The way i would describe it: This memo defines simple extensions to TCP-Reno CC to support and leverage a pre-known network guaranteed (minimum) bandwidth (CIR) and pre-known maximumum needed bandwidth (PIR). IMHO, this work is very much orthogonal to how you would determine PIR and CIR, the draft mentions some IMHO cool new ideas how to do this, but this CC draft by itself would be a great benefit to application developers today (assume CIR/PIR API extensions to transport service -> TAPS, etc. pp). My most simple deployment scenario is simple GUI on video devices/apps, e.g.: in home (STB) where i could select guaranted minimum qualiy (translated by app into CIR), and (optional) maximum quality (PIR). On the parents living room STB CIR would be set according to 4k, and maybe in one other room to FullHD, and the rest has to start compete for available bandwidth all the way from *yuck* QCIF). Of course, with more and more high-bitrate apps like AR/VR and others, the problem to support easy policy differentiation for different apps will increase, but i always like to look first at the most common use case that could profit today. I feel like we have discussed this problem forever, but i am not aware of any actual progress that app developers could use. We really need to break through the chicken & egg circle. IMHO we first need to enable the host stacks to do something like this, and then folks will see a lot easier the need to have better in-network mechanisms to actually guarantee CIR. So, i wouldn't know something more pragmatic & simple than this proposal based on TFP reno. > Alternatively, corresponding research could perhaps be performed in the ICCRG. ICCRG has published RFC 6077 to document some of the open research issues in this space. Nice overview for researchers. Can't quite find from browsing a section related to this CIR/PIR knowledge issue, admission control is mentioned only once in passing. Let me know what you think i should specifically look into, and we'll be happy to relate to that RFC6077 work in the draft. > Michael > > > From: tsvwg [mailto:tsvwg-bounces@ietf.org] On Behalf Of Yingzhen Qu > Sent: Sunday, March 04, 2018 6:55 AM > To: tsvwg@ietf.org; tsvwg-chairs@ietf.org > Cc: Thomas Nadeau > Subject: [tsvwg] Agenda requests for TSVWG@IETF101 > > Dear Chairs, > > A new draft (The draft was suggested by TSVWG @IETF100) was just submitted, and we???d like to request a time slot to present it @IETF101. > > Title: A New Congestion Control in Bandwidth Guaranteed Network > Presenter: Yingzhen Qu (Huawei) > Time required (including Q/A): 10 mins > Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ > > If there is any question, please kindly let us know. > > Thanks, > Yingzhen -- --- tte@cs.fau.de From nobody Mon Mar 12 13:58:33 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0A6C1126DD9; Mon, 12 Mar 2018 13:58:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.96 X-Spam-Level: X-Spam-Status: No, score=-3.96 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id A4EcbHgstUx5; Mon, 12 Mar 2018 13:58:22 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8DDFE126CF9; Mon, 12 Mar 2018 13:58:22 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [131.188.34.77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 7D25358C505; Mon, 12 Mar 2018 21:58:18 +0100 (CET) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 5DCFDB0DCE8; Mon, 12 Mar 2018 21:58:18 +0100 (CET) Date: Mon, 12 Mar 2018 21:58:18 +0100 From: Toerless Eckert To: Emmanuel Lochin Cc: tsvwg@ietf.org, tcpm@ietf.org Message-ID: <20180312205818.GC25534@faui40p.informatik.uni-erlangen.de> References: <419905ca-305b-594d-2958-fb468e6e5bb0@isae-supaero.fr> <9ef0cc0b-7bbc-d266-2410-b03265b8c2a1@isae-supaero.fr> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <9ef0cc0b-7bbc-d266-2410-b03265b8c2a1@isae-supaero.fr> User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: Re: [tcpm] draft-han-tsvwg-cc (was: Re: [tsvwg] Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Mar 2018 20:58:25 -0000 On Mon, Mar 05, 2018 at 10:16:19AM +0100, Emmanuel Lochin wrote: > What I remember (looking back IETF archives) is that Sally Floyd > answered she had no objection concerning the proposal if it was > clearly written that the gTFRC mechanism must be used only in the > context of a QoS network. And if history serves me right, that draft of yours was before the IETF figured out that there was and is a lot of traffic assuming bandwidth guaranteees without sufficient network guarantees provided - and ultimately, the concept of circuit breakers was born. I think for these mechanisms we're proposing one could equally refine their applicability to "badly QoS supported" networks by making them automatically fall back to standard congestion control (in our drafts case Reno without CIR). > Sally Floyd also asked questions related > to the algorithm and proposed enhancements about the slow-start > behavior of the mechanism. We answered that we fully agreed with > this hypothesis and justified the choice of our design concerning > the slow-start method. > Therefore, a second discussion started with Mark Allman on potential > security issues raised by this mechanism. Basically, Mark asked us > to add a part concerning the reaction to the congestion in the > guaranteed part (the ???g??? part) even if we are in a context of a > QoS network. We have discussed this point and following this emails > exchange, published a new version of the draft. Right, your -02 section 3.4.2. I told the authors of our draft that that was also a piece i felt is missing in our draft. See above - i would today rephrase it in terms of a "soft circuit breaker" - not breaking the flow at all, but just breaking the assumption of have a CIR. > We also talked about the best way to publish this proposal, it > seemed to be well-accepted to publish a new draft rather than > inserting this contribution inside the new TFRC draft (now RFC > 5348). As a result, we extended the gTFRC draft in order to detail a > complete protocol for QoS networks. > > Finally I left the laboratory I worked during the elaboration of > this draft in 2007 and I assume that this work has not been pursued. Right. > Considering your proposal, I reckon you'll be face to the same > questions in particular the one on the security issue. > But I'm quite > interesting in discussing this proposal on the mailing-list while > even doing something more generic about transport protocol > extensions for QoS networks. Great. Toerless > > EL > > > > > > >BTW, yes, AR/VR means Augmented Reality/Virtual Reality. I'll add > >the acronyms to the next version. > > > >Thanks, > >Yingzhen > > > > > >On Sun, Mar 4, 2018 at 3:45 AM, Emmanuel Lochin > > >> wrote: > > > > Hi Yingzhen > > > > Just for your information, you might be interested in gTFRC : > > https://tools.ietf.org/html/draft-lochin-ietf-tsvwg-gtfrc-02 > > > > which is a similar solution i.e. a CC for bandwidth guaranteed > > networks with TFRC. > > Furthermore just a quick question : in your draft does AR/VR > > stands for Augmented/Real Virtuality ? > > > > Regards > > > > Emmanuel > > > > > > On 04/03/2018 06:54, Yingzhen Qu wrote: > >> > >> Dear Chairs, > >> > >> A new draft (The draft was suggested by TSVWG @IETF100) was just > >> submitted, and we???d like to request a time slot to present it > >> @IETF101. > >> > >> Title:A New Congestion Control in Bandwidth Guaranteed Network > >> > >> Presenter: Yingzhen Qu (Huawei) > >> > >> Time required (including Q/A): 10 mins > >> > >> Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ > >> > >> > >> If there is any question, please kindly let us know. > >> > >> Thanks, > >> > >> Yingzhen > >> > > > > -- Emmanuel LOCHIN > > Professeur ISAE > > > > ISAE SUPAERO - Institut Suprieur de l'Aronautique et de l'Espace > > 10 avenue Edouard Belin > > - BP 54032 - 31055 TOULOUSE CEDEX 4 FRANCE -http://www.isae-supaero.fr > > Tel+33 5 61 33 84 85 - Fax(+33) 5 61 33 83 30 > > > > > > -- > Emmanuel LOCHIN > Professeur ISAE > ISAE SUPAERO - Institut Suprieur de l'Aronautique et de l'Espace > 10 avenue Edouard Belin - BP 54032 - 31055 TOULOUSE CEDEX 4 FRANCE - > http://www.isae-supaero.fr > Tel +33 5 61 33 84 85 - Fax (+33) 5 61 33 83 45 > Web : http://personnel.isae.fr/emmanuel-lochin/ > From nobody Mon Mar 12 23:43:36 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E6C69126DFF; 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Mon, 12 Mar 2018 23:43:29 -0700 (PDT) MIME-Version: 1.0 Received: by 10.237.60.123 with HTTP; Mon, 12 Mar 2018 23:43:28 -0700 (PDT) In-Reply-To: References: <5A9BEB65.6010102@erg.abdn.ac.uk> From: Yingzhen Qu Date: Mon, 12 Mar 2018 23:43:28 -0700 Message-ID: To: "Scharf, Michael (Nokia - DE/Stuttgart)" Cc: "gorry@erg.abdn.ac.uk" , Thomas Nadeau , "tcpm@ietf.org" , Yingzhen Qu , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" Content-Type: multipart/alternative; boundary="001a114e528687167c056745930c" Archived-At: Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 06:43:33 -0000 --001a114e528687167c056745930c Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Michael, Sorry for the late response. Thanks for pointing out that we missed this important reference. You're right, Quick-Start and our proposal do have lots of similarities, for example both of them require that end-points and routers to work together. But they are also different in details. For example, in our proposal in-band signaling proposal bandwidth is reserved on routers along the path. In next version of this draft, We'll add discussions about RFC 4728 and 6077. BTW, can I request a slot to present this draft in TCPM if time allows? Thanks, Yingzhen On Mon, Mar 5, 2018 at 12:09 AM, Scharf, Michael (Nokia - DE/Stuttgart) < michael.scharf@nokia.com> wrote: > I believe that this proposal is similar to QuickStart TCP (RFC 4782), > which is not cited in draft-han-tsvwg-cc, and the reference is also missi= ng > in draft-han-6man-in-band-signaling-for-transport-qos. > > > > RFC 6077 explains some of the issues that an in-band signaling mechanism > like Quick-Start has to solve. As far as I can tell, the fundamental > challenge is neither the protocol specification nor a prototype > implementation. For instance, it has been proven that QuickStart TCP can = be > implemented e.g. in network processors (see http://www.ikr.uni-stuttgart. > de/Content/Publications/Archive/Sf_Diss_40112.pdf). > > > > So, when updating the documents, I suggest to add a discussion of how the > open research issues explained in RFC 6077 are addressed. > > > > Michael > > > > > > *From:* Yingzhen Qu [mailto:yingzhen.ietf@gmail.com] > *Sent:* Sunday, March 04, 2018 9:59 PM > *To:* gorry@erg.abdn.ac.uk > *Cc:* Scharf, Michael (Nokia - DE/Stuttgart) ; > Thomas Nadeau ; tcpm@ietf.org; Yingzhen Qu < > yingzhen.qu@huawei.com>; tsvwg@ietf.org; tsvwg-chairs@ietf.org > *Subject:* Re: [tsvwg] Agenda requests for TSVWG@IETF101 > > > > Hi Gorry and Michael, > > > > Thanks for the suggestion, I'll request a presentation in ICCRG. > Meanwhile, I think since the in-band signaling draft was presented in > TSVWG, if time allows it still makes sense to present this draft in TSVWG= . > > > > The in-band signaling draft covers lots of aspects, and the required > changes include network layer and transport layer. We're working on > updating the draft, and may break it into pieces to fit different WGs. > > > > Your comments and help are very much appreciated. > > > > Thanks, > > Yingzhen > > > > On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst > wrote: > > I am unsure yet what the correct group of people world be to explore a > "Bandwidth Guaranteed Network". The presentation last IETF looked like th= e > work could imply a need for changes proposed to the network layer (using > OAM exchnages) to set the sending rate and make those bandwidth > reservations. In the end, it could result in a protocol quite different = to > TCP, I think this sort of change may possibly have a home in TSVWG - but > first I'd agree with Michaeland would encourage a presentation of the > problem statement in ICCRG to explore the issues. > > Gorry > > On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) wrote: > > > Hi all, > > From the abstract: =E2=80=9C=E2=80=A6This draft proposes a new TCP conges= tion control > algorithm used in bandwidth guaranteed networks. It is an extension to t= he > current TCP standards.=E2=80=9D > > In the IETF, I believe the expertise for this specific document would be > in TCPM, which in CC. If the authors are interested in feedback on the > proposed mechanism, I would recommend to ask TCPM. > > Alternatively, corresponding research could perhaps be performed in the > ICCRG. ICCRG has published RFC 6077 to document some of the open research > issues in this space. > > Michael > > *From:*tsvwg [mailto:tsvwg-bounces@ietf.org] *On Behalf Of *Yingzhen Qu > *Sent:* Sunday, March 04, 2018 6:55 AM > *To:* tsvwg@ietf.org; tsvwg-chairs@ietf.org > *Cc:* Thomas Nadeau > *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 > > Dear Chairs, > > A new draft (The draft was suggested by TSVWG @IETF100) was just > submitted, and we=E2=80=99d like to request a time slot to present it @IE= TF101. > > Title:A New Congestion Control in Bandwidth Guaranteed Network > > Presenter: Yingzhen Qu (Huawei) > > Time required (including Q/A): 10 mins > > Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ > > If there is any question, please kindly let us know. > > Thanks, > > Yingzhen > > > > > --001a114e528687167c056745930c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Michael,
=C2=A0
Sorry for the late respon= se.=C2=A0

Thanks for pointing out that we missed t= his important reference. You're right, Quick-Start and our proposal do = have lots of similarities, for example both of them require that end-points= and routers to work together. But they are also different in details. For = example, in our proposal in-band signaling proposal bandwidth is reserved o= n routers along the path.

In next version of this = draft, We'll add discussions about RFC 4728 and 6077.

BTW, can I request a slot to present this draft in TCPM if time all= ows?

Thanks,
Yingzhen

On Mon, Mar 5, 2018 at 1= 2:09 AM, Scharf, Michael (Nokia - DE/Stuttgart) <michael.scharf@nok= ia.com> wrote:

I believe that this proposal is similar to QuickStar= t TCP (RFC 4782), which is not cited in draft-han-tsvwg-cc, and the referen= ce is also missing in draft-han-6man-in-band-signaling-for-transport-q= os.

=C2=A0

RFC 6077 explains some of the issues that an in-band= signaling mechanism like Quick-Start has to solve. As far as I can tell, t= he fundamental challenge is neither the protocol specification nor a protot= ype implementation. For instance, it has been proven that QuickStart TCP can be implemented e.g. in network = processors (see http://www.ikr.uni-stuttgart.de/Content/Publications/Archive/Sf_D= iss_40112.pdf).

=C2=A0

So, when updating the documents, I suggest to add a = discussion of how the open research issues explained in RFC 6077 are addres= sed.

=C2=A0

Michael

=C2=A0

=C2=A0

From: Yingzhen Qu [mailto:yingzhen.ietf@gmail.com]=
Sent: Sunday, March 04, 2018 9:59 PM
To: gorry@= erg.abdn.ac.uk
Cc: Scharf, Michael (Nokia - DE/Stuttgart) <michael.scharf@nokia.com>; = Thomas Nadeau <tnadeau@lucidvision.com>; tcpm@ietf.org; Yingzhen Qu <yingzhen.qu@huawei.com>; tsvwg@ietf.org; tsvwg-chairs@ietf.org
Subject: Re: [tsvwg] Agenda requests for TSVWG@IETF101=

=C2=A0

Hi Gorry and Michael,

=C2=A0

Thanks for the suggestion, I'll request a presen= tation in ICCRG. Meanwhile, I think since the in-band signaling draft was p= resented in TSVWG, if time allows it still makes sense to present this draf= t in TSVWG.=C2=A0

=C2=A0

The in-band signaling draft covers lots of aspects, = and the required changes include network layer and transport layer. We'= re working on updating the draft, and may break it into pieces to fit diffe= rent WGs.

=C2=A0

Your comments and help are very much appreciated.=

=C2=A0

Thanks,

Yingzhen

=C2=A0

On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst <= gorry@erg.abdn.ac= .uk> wrote:

I am unsure yet what the correct group of people wor= ld be to explore a "Bandwidth Guaranteed Network". The presentati= on last IETF looked like the work could imply a need for changes proposed t= o the network layer (using OAM exchnages) to set the sending rate and make those bandwidth reservations.=C2=A0 In the e= nd, it could result in a protocol quite different to TCP, I think this sort= of change may possibly have a home in TSVWG=C2=A0 - but first I'd agre= e with Michaeland would encourage a presentation of the problem statement in ICCRG to explore the issues.

Gorry

On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) wrote:<= u>


Hi all,

>From the abstract: =E2=80=9C=E2=80=A6This draft proposes a new TCP congesti= on control algorithm used in bandwidth guaranteed networks.=C2=A0 It is an = extension to the current TCP standards.=E2=80=9D

In the IETF, I believe the expertise for this specific document would be in= TCPM, which in CC. If the authors are interested in feedback on the propos= ed mechanism, I would recommend to ask TCPM.

Alternatively, corresponding research could perhaps be performed in the ICC= RG. ICCRG has published RFC 6077 to document some of the open research issu= es in this space.

Michael

*From:*tsvwg [mailto:tsvwg-bounces@ietf.org] *On Behalf Of *Yingzhen Qu
*Sent:* Sunday, March 04, 2018 6:55 AM
*To:* tsvwg@ietf.org; tsvwg-chairs@ietf.org
*Cc:* Thomas Nadeau <tnadeau@lucidvision.com>
*Subject:* [tsvwg] Agenda requests for TSVWG@IETF101

Dear Chairs,

A new draft (The draft was suggested by TSVWG @IETF100) was just submitted,= and we=E2=80=99d like to request a time slot to present it @IETF101.

Title:A New Congestion Control in Bandwidth Guaranteed Network

Presenter: Yingzhen Qu (Huawei)

Time required (including Q/A): 10 mins

Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/

If there is any question, please kindly let us know.

Thanks,

Yingzhen

=C2=A0

=C2=A0


--001a114e528687167c056745930c-- From nobody Tue Mar 13 02:39:40 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E027812D7FC; Tue, 13 Mar 2018 02:39:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.209 X-Spam-Level: X-Spam-Status: No, score=-4.209 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BduBsR4tgPnn; Tue, 13 Mar 2018 02:39:35 -0700 (PDT) Received: from pegasus.erg.abdn.ac.uk (pegasus.erg.abdn.ac.uk [139.133.204.173]) by ietfa.amsl.com (Postfix) with ESMTP id 6DDEF12D86A; Tue, 13 Mar 2018 02:39:35 -0700 (PDT) Received: from Gs-MacBook-Pro.local (at-zeroshell-1.erg.abdn.ac.uk [139.133.217.68]) by pegasus.erg.abdn.ac.uk (Postfix) with ESMTPA id 31C0E1B00081; Tue, 13 Mar 2018 09:38:55 +0000 (GMT) Message-ID: <5AA79C2E.1040808@erg.abdn.ac.uk> Date: Tue, 13 Mar 2018 09:38:54 +0000 From: Gorry Fairhurst Reply-To: gorry@erg.abdn.ac.uk Organization: University of Aberdeen User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: Katsushi Kobayashi CC: Yingzhen Qu , "Scharf, Michael (Nokia - DE/Stuttgart)" , Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" , Yingzhen Qu References: <5A9BEB65.6010102@erg.abdn.ac.uk> <050065D2-5F2E-4E79-9BD1-E1DC03F13900@acm.org> In-Reply-To: <050065D2-5F2E-4E79-9BD1-E1DC03F13900@acm.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 09:39:39 -0000 Maybe I'm saying what is obvious, but to be sure: The way I see QS is: - The router tracks the unutilised link capacity at the current time, and uses this as some estimate of what may be available to new flows in the near future. - The router responds to QS requests and can accept them if there is "unutilised capacity" remaining. - When accepted router updates it's count of the total unutilised capacity reducing by the accepted QS requests. (i.e., Subsequent QS requests in the same interval will currently have a smaller pool of unutilised capacity available). - After the end of the interval all "QS requests" expire and the router again makes a measure of the unutilised capacity at the current time. None of this implies a "reservation" of link resource in my thinking. In QS, the whole link capacity is intended to be shared using congestion control, and if flows start to send more using normal CC within the interval where QS is operating, they would simply receive a larger share of the capacity. That is: QS request didn't "allocate" any link resource. Gorry On 13/03/2018, 06:58, Katsushi Kobayashi wrote: > Hi, > > I think TCP QS router on the path also reserves bandwidth resource, > if it accepts a request. > > RFC4782 says: > If the router approves the Quick-Start Request, this approval SHOULD > be taken into account in the router's decision to accept or reject > subsequent Quick-Start Requests (e.g., using a variable that tracks > the recent aggregate of accepted Quick-Start Requests). > > > --- > Katsushi Kobayashi > >> 2018/03/13 午後3:43、Yingzhen Qu > > のメール: >> >> Hi Michael, >> Sorry for the late response. >> >> Thanks for pointing out that we missed this important reference. >> You're right, Quick-Start and our proposal do have lots of >> similarities, for example both of them require that end-points and >> routers to work together. But they are also different in details. For >> example, in our proposal in-band signaling proposal bandwidth is >> reserved on routers along the path. >> >> In next version of this draft, We'll add discussions about RFC 4728 >> and 6077. >> >> BTW, can I request a slot to present this draft in TCPM if time allows? >> >> Thanks, >> Yingzhen >> >> On Mon, Mar 5, 2018 at 12:09 AM, Scharf, Michael (Nokia - >> DE/Stuttgart) > > wrote: >> >> I believe that this proposal is similar to QuickStart TCP (RFC >> 4782), which is not cited in draft-han-tsvwg-cc, and the >> reference is also missing in >> draft-han-6man-in-band-signaling-for-transport-qos. >> >> RFC 6077 explains some of the issues that an in-band signaling >> mechanism like Quick-Start has to solve. As far as I can tell, >> the fundamental challenge is neither the protocol specification >> nor a prototype implementation. For instance, it has been proven >> that QuickStart TCP can be implemented e.g. in network processors >> (see >> http://www.ikr.uni-stuttgart.de/Content/Publications/Archive/Sf_Diss_40112.pdf >> ). >> >> So, when updating the documents, I suggest to add a discussion of >> how the open research issues explained in RFC 6077 are addressed. >> >> Michael >> >> *From:* Yingzhen Qu [mailto:yingzhen.ietf@gmail.com >> ] >> *Sent:* Sunday, March 04, 2018 9:59 PM >> *To:* gorry@erg.abdn.ac.uk >> *Cc:* Scharf, Michael (Nokia - DE/Stuttgart) >> >; >> Thomas Nadeau > >; tcpm@ietf.org >> ; Yingzhen Qu > >; tsvwg@ietf.org >> ; tsvwg-chairs@ietf.org >> >> *Subject:* Re: [tsvwg] Agenda requests for TSVWG@IETF101 >> >> Hi Gorry and Michael, >> >> Thanks for the suggestion, I'll request a presentation in ICCRG. >> Meanwhile, I think since the in-band signaling draft was >> presented in TSVWG, if time allows it still makes sense to >> present this draft in TSVWG. >> >> The in-band signaling draft covers lots of aspects, and the >> required changes include network layer and transport layer. We're >> working on updating the draft, and may break it into pieces to >> fit different WGs. >> >> Your comments and help are very much appreciated. >> >> Thanks, >> >> Yingzhen >> >> On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst >> > wrote: >> >> I am unsure yet what the correct group of people world be to >> explore a "Bandwidth Guaranteed Network". The presentation >> last IETF looked like the work could imply a need for changes >> proposed to the network layer (using OAM exchnages) to set >> the sending rate and make those bandwidth reservations. In >> the end, it could result in a protocol quite different to >> TCP, I think this sort of change may possibly have a home in >> TSVWG - but first I'd agree with Michaeland would encourage >> a presentation of the problem statement in ICCRG to explore >> the issues. >> >> Gorry >> >> On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) >> wrote: >> >> >> Hi all, >> >> >From the abstract: “…This draft proposes a new TCP >> congestion control algorithm used in bandwidth guaranteed >> networks. It is an extension to the current TCP standards.” >> >> In the IETF, I believe the expertise for this specific >> document would be in TCPM, which in CC. If the authors >> are interested in feedback on the proposed mechanism, I >> would recommend to ask TCPM. >> >> Alternatively, corresponding research could perhaps be >> performed in the ICCRG. ICCRG has published RFC 6077 to >> document some of the open research issues in this space. >> >> Michael >> >> *From:*tsvwg [mailto:tsvwg-bounces@ietf.org >> ] *On Behalf Of *Yingzhen Qu >> *Sent:* Sunday, March 04, 2018 6:55 AM >> *To:* tsvwg@ietf.org ; >> tsvwg-chairs@ietf.org >> *Cc:* Thomas Nadeau > > >> *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 >> >> Dear Chairs, >> >> A new draft (The draft was suggested by TSVWG @IETF100) >> was just submitted, and we’d like to request a time slot >> to present it @IETF101. >> >> Title:A New Congestion Control in Bandwidth Guaranteed >> Network >> >> Presenter: Yingzhen Qu (Huawei) >> >> Time required (including Q/A): 10 mins >> >> Draft: >> https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ >> >> >> If there is any question, please kindly let us know. >> >> Thanks, >> >> Yingzhen >> >> > From nobody Tue Mar 13 02:45:19 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5875F12D7FC; Tue, 13 Mar 2018 02:45:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.609 X-Spam-Level: X-Spam-Status: No, score=-2.609 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KRP72oOC8qxc; Tue, 13 Mar 2018 02:45:15 -0700 (PDT) Received: from drew.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 15E6912D72F; Tue, 13 Mar 2018 02:45:14 -0700 (PDT) Received: from [IPv6:2003:cd:6bea:8000:6010:e1fa:597e:6ad7] (p200300CD6BEA80006010E1FA597E6AD7.dip0.t-ipconnect.de [IPv6:2003:cd:6bea:8000:6010:e1fa:597e:6ad7]) (Authenticated sender: lurchi) by mail-n.franken.de (Postfix) with ESMTPSA id 00F10721E280C; Tue, 13 Mar 2018 10:45:10 +0100 (CET) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) From: Michael Tuexen In-Reply-To: Date: Tue, 13 Mar 2018 10:45:09 +0100 Cc: "Scharf, Michael (Nokia - DE/Stuttgart)" , Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" , Yingzhen Qu Content-Transfer-Encoding: quoted-printable Message-Id: <430A7C48-DA1D-4D73-AB40-F2B30A8E8580@lurchi.franken.de> References: <5A9BEB65.6010102@erg.abdn.ac.uk> To: Yingzhen Qu X-Mailer: Apple Mail (2.3445.5.20) Archived-At: Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 09:45:18 -0000 > On 13. Mar 2018, at 07:43, Yingzhen Qu = wrote: >=20 > Hi Michael, > =20 > Sorry for the late response.=20 >=20 > Thanks for pointing out that we missed this important reference. = You're right, Quick-Start and our proposal do have lots of similarities, = for example both of them require that end-points and routers to work = together. But they are also different in details. For example, in our = proposal in-band signaling proposal bandwidth is reserved on routers = along the path. >=20 > In next version of this draft, We'll add discussions about RFC 4728 = and 6077. >=20 > BTW, can I request a slot to present this draft in TCPM if time = allows? How much time would you need? Best regards Michael >=20 > Thanks, > Yingzhen >=20 > On Mon, Mar 5, 2018 at 12:09 AM, Scharf, Michael (Nokia - = DE/Stuttgart) wrote: > I believe that this proposal is similar to QuickStart TCP (RFC 4782), = which is not cited in draft-han-tsvwg-cc, and the reference is also = missing in draft-han-6man-in-band-signaling-for-transport-qos. >=20 > =20 >=20 > RFC 6077 explains some of the issues that an in-band signaling = mechanism like Quick-Start has to solve. As far as I can tell, the = fundamental challenge is neither the protocol specification nor a = prototype implementation. For instance, it has been proven that = QuickStart TCP can be implemented e.g. in network processors (see = http://www.ikr.uni-stuttgart.de/Content/Publications/Archive/Sf_Diss_40112= .pdf). >=20 > =20 >=20 > So, when updating the documents, I suggest to add a discussion of how = the open research issues explained in RFC 6077 are addressed. >=20 > =20 >=20 > Michael >=20 > =20 >=20 > =20 >=20 > From: Yingzhen Qu [mailto:yingzhen.ietf@gmail.com]=20 > Sent: Sunday, March 04, 2018 9:59 PM > To: gorry@erg.abdn.ac.uk > Cc: Scharf, Michael (Nokia - DE/Stuttgart) ; = Thomas Nadeau ; tcpm@ietf.org; Yingzhen Qu = ; tsvwg@ietf.org; tsvwg-chairs@ietf.org > Subject: Re: [tsvwg] Agenda requests for TSVWG@IETF101 >=20 > =20 >=20 > Hi Gorry and Michael, >=20 > =20 >=20 > Thanks for the suggestion, I'll request a presentation in ICCRG. = Meanwhile, I think since the in-band signaling draft was presented in = TSVWG, if time allows it still makes sense to present this draft in = TSVWG.=20 >=20 > =20 >=20 > The in-band signaling draft covers lots of aspects, and the required = changes include network layer and transport layer. We're working on = updating the draft, and may break it into pieces to fit different WGs. >=20 > =20 >=20 > Your comments and help are very much appreciated. >=20 > =20 >=20 > Thanks, >=20 > Yingzhen >=20 > =20 >=20 > On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst = wrote: >=20 > I am unsure yet what the correct group of people world be to explore a = "Bandwidth Guaranteed Network". The presentation last IETF looked like = the work could imply a need for changes proposed to the network layer = (using OAM exchnages) to set the sending rate and make those bandwidth = reservations. In the end, it could result in a protocol quite different = to TCP, I think this sort of change may possibly have a home in TSVWG - = but first I'd agree with Michaeland would encourage a presentation of = the problem statement in ICCRG to explore the issues. >=20 > Gorry >=20 > On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) wrote: >=20 >=20 > Hi all, >=20 > >=46rom the abstract: =E2=80=9C=E2=80=A6This draft proposes a new TCP = congestion control algorithm used in bandwidth guaranteed networks. It = is an extension to the current TCP standards.=E2=80=9D >=20 > In the IETF, I believe the expertise for this specific document would = be in TCPM, which in CC. If the authors are interested in feedback on = the proposed mechanism, I would recommend to ask TCPM. >=20 > Alternatively, corresponding research could perhaps be performed in = the ICCRG. ICCRG has published RFC 6077 to document some of the open = research issues in this space. >=20 > Michael >=20 > *From:*tsvwg [mailto:tsvwg-bounces@ietf.org] *On Behalf Of *Yingzhen = Qu > *Sent:* Sunday, March 04, 2018 6:55 AM > *To:* tsvwg@ietf.org; tsvwg-chairs@ietf.org > *Cc:* Thomas Nadeau > *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 >=20 > Dear Chairs, >=20 > A new draft (The draft was suggested by TSVWG @IETF100) was just = submitted, and we=E2=80=99d like to request a time slot to present it = @IETF101. >=20 > Title:A New Congestion Control in Bandwidth Guaranteed Network >=20 > Presenter: Yingzhen Qu (Huawei) >=20 > Time required (including Q/A): 10 mins >=20 > Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ >=20 > If there is any question, please kindly let us know. >=20 > Thanks, >=20 > Yingzhen >=20 > =20 >=20 > =20 >=20 >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm From nobody Tue Mar 13 03:21:45 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A9AD312D878; Tue, 13 Mar 2018 03:21:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.909 X-Spam-Level: X-Spam-Status: No, score=-1.909 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VGA0dCxk_b9e; Tue, 13 Mar 2018 03:21:42 -0700 (PDT) Received: from pegasus.erg.abdn.ac.uk (pegasus.erg.abdn.ac.uk [IPv6:2001:630:241:204::f0f0]) by ietfa.amsl.com (Postfix) with ESMTP id 2E69712711E; Tue, 13 Mar 2018 03:21:42 -0700 (PDT) Received: from Gs-MacBook-Pro.local (at-zeroshell-1.erg.abdn.ac.uk [139.133.217.68]) by pegasus.erg.abdn.ac.uk (Postfix) with ESMTPA id 1B6431B0012A; Tue, 13 Mar 2018 10:21:08 +0000 (GMT) Message-ID: <5AA7A614.3050706@erg.abdn.ac.uk> Date: Tue, 13 Mar 2018 10:21:08 +0000 From: Gorry Fairhurst Reply-To: gorry@erg.abdn.ac.uk Organization: University of Aberdeen User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: "tcpm-chairs@ietf.org" , "tsvwg-chairs@ietf.org" References: <5A9BEB65.6010102@erg.abdn.ac.uk> <430A7C48-DA1D-4D73-AB40-F2B30A8E8580@lurchi.franken.de> In-Reply-To: <430A7C48-DA1D-4D73-AB40-F2B30A8E8580@lurchi.franken.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 10:21:45 -0000 Hi Chairs... I think we should coordinate:-) The history I know is (please add). I think I'd benefit from more thoughts by others. There is work in ETSI by various companies on next generation protocols. The work is diverse and most of it aims at significant changes to IP. I spoke with some people (by no means all) who attend, and they suggested at this time there was no consensus on what they thought was the best direction. We saw presentations on the overall architecture last IETF. There was discussions in 6man, intarea, tsvwg, and possibly other places. I saw significant push-back from others on the idea of introducing a new QoS model, but what they proposed was complex and had not been discussed much prior to the IETF meeting, so it may hard to understand by people. A key question is whether this can work on a path that does not include one specific vendor's equipment. What I understood was that it relied on OAM information about the path. This phrase in the latest draft seems to agree with what I think was presented last IETF: "When a sender receives the third duplicated ACK, but no previous OAM congestion alarm has been received, then it is considered that a segment is lost due to random failure not congestion. In this case the cwnd is not changed." As for TSVWG, we have had quite a long discussion with the authors at the meeting and after. The TSV chairs encouraged them to take the CC aspects separately and explain why this method is better and detail what this benefit is and what is required in the router to allow this. We suggested an initial talk in ICCRG to present results and show *why* this is attractive. As far as I know they requested time to do this. They also requested time in TSVWG - but there's (as yet) been little discssion on the list, so we curently advise them to prepare a slide to show to say why people should read the draft. We have not decided (yet) to give time to this new framework. They have now also requested time in TCPM. I don't know whethere this time they are also requesting slots some other places to discuss other aspects. I also suggested (informally) that they should try making a great short presentation of how this is a new opportunity and whar has changed since we last saw schemes proposed. I do see that there are significant advances in router forwarding hardware - and I suspect there could be similar ideas in cisco, etc.Would other vendors (or operators) be interested in standardising this? I think such a talk could be put to TSVAREA. Gorry On 13/03/2018, 09:45, Michael Tuexen wrote: >> On 13. Mar 2018, at 07:43, Yingzhen Qu wrote: >> >> Hi Michael, >> >> Sorry for the late response. >> >> Thanks for pointing out that we missed this important reference. You're right, Quick-Start and our proposal do have lots of similarities, for example both of them require that end-points and routers to work together. But they are also different in details. For example, in our proposal in-band signaling proposal bandwidth is reserved on routers along the path. >> >> In next version of this draft, We'll add discussions about RFC 4728 and 6077. >> >> BTW, can I request a slot to present this draft in TCPM if time allows? > How much time would you need? > > Best regards > Michael >> Thanks, >> Yingzhen >> >> On Mon, Mar 5, 2018 at 12:09 AM, Scharf, Michael (Nokia - DE/Stuttgart) wrote: >> I believe that this proposal is similar to QuickStart TCP (RFC 4782), which is not cited in draft-han-tsvwg-cc, and the reference is also missing in draft-han-6man-in-band-signaling-for-transport-qos. >> >> >> >> RFC 6077 explains some of the issues that an in-band signaling mechanism like Quick-Start has to solve. As far as I can tell, the fundamental challenge is neither the protocol specification nor a prototype implementation. For instance, it has been proven that QuickStart TCP can be implemented e.g. in network processors (see http://www.ikr.uni-stuttgart.de/Content/Publications/Archive/Sf_Diss_40112.pdf). >> >> >> >> So, when updating the documents, I suggest to add a discussion of how the open research issues explained in RFC 6077 are addressed. >> >> >> >> Michael >> >> >> >> >> >> From: Yingzhen Qu [mailto:yingzhen.ietf@gmail.com] >> Sent: Sunday, March 04, 2018 9:59 PM >> To: gorry@erg.abdn.ac.uk >> Cc: Scharf, Michael (Nokia - DE/Stuttgart); Thomas Nadeau; tcpm@ietf.org; Yingzhen Qu; tsvwg@ietf.org; tsvwg-chairs@ietf.org >> Subject: Re: [tsvwg] Agenda requests for TSVWG@IETF101 >> >> >> >> Hi Gorry and Michael, >> >> >> >> Thanks for the suggestion, I'll request a presentation in ICCRG. Meanwhile, I think since the in-band signaling draft was presented in TSVWG, if time allows it still makes sense to present this draft in TSVWG. >> >> >> >> The in-band signaling draft covers lots of aspects, and the required changes include network layer and transport layer. We're working on updating the draft, and may break it into pieces to fit different WGs. >> >> >> >> Your comments and help are very much appreciated. >> >> >> >> Thanks, >> >> Yingzhen >> >> >> >> On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst wrote: >> >> I am unsure yet what the correct group of people world be to explore a "Bandwidth Guaranteed Network". The presentation last IETF looked like the work could imply a need for changes proposed to the network layer (using OAM exchnages) to set the sending rate and make those bandwidth reservations. In the end, it could result in a protocol quite different to TCP, I think this sort of change may possibly have a home in TSVWG - but first I'd agree with Michaeland would encourage a presentation of the problem statement in ICCRG to explore the issues. >> >> Gorry >> >> On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) wrote: >> >> >> Hi all, >> >> > From the abstract: “…This draft proposes a new TCP congestion control algorithm used in bandwidth guaranteed networks. It is an extension to the current TCP standards.” >> >> In the IETF, I believe the expertise for this specific document would be in TCPM, which in CC. If the authors are interested in feedback on the proposed mechanism, I would recommend to ask TCPM. >> >> Alternatively, corresponding research could perhaps be performed in the ICCRG. ICCRG has published RFC 6077 to document some of the open research issues in this space. >> >> Michael >> >> *From:*tsvwg [mailto:tsvwg-bounces@ietf.org] *On Behalf Of *Yingzhen Qu >> *Sent:* Sunday, March 04, 2018 6:55 AM >> *To:* tsvwg@ietf.org; tsvwg-chairs@ietf.org >> *Cc:* Thomas Nadeau >> *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 >> >> Dear Chairs, >> >> A new draft (The draft was suggested by TSVWG @IETF100) was just submitted, and we’d like to request a time slot to present it @IETF101. >> >> Title:A New Congestion Control in Bandwidth Guaranteed Network >> >> Presenter: Yingzhen Qu (Huawei) >> >> Time required (including Q/A): 10 mins >> >> Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ >> >> If there is any question, please kindly let us know. >> >> Thanks, >> >> Yingzhen >> >> >> >> >> >> >> _______________________________________________ >> tcpm mailing list >> tcpm@ietf.org >> https://www.ietf.org/mailman/listinfo/tcpm From nobody Tue Mar 13 04:23:50 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4FFFB12D887; 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Tue, 13 Mar 2018 04:52:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.21 X-Spam-Level: X-Spam-Status: No, score=-4.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GGm5Yws4iVeX; Tue, 13 Mar 2018 04:52:05 -0700 (PDT) Received: from pegasus.erg.abdn.ac.uk (pegasus.erg.abdn.ac.uk [139.133.204.173]) by ietfa.amsl.com (Postfix) with ESMTP id D3FFF12DA29; Tue, 13 Mar 2018 04:52:04 -0700 (PDT) Received: from Gs-MacBook-Pro.local (at-zeroshell-1.erg.abdn.ac.uk [139.133.217.68]) by pegasus.erg.abdn.ac.uk (Postfix) with ESMTPA id 5DC131B0012A; Tue, 13 Mar 2018 11:51:30 +0000 (GMT) Message-ID: <5AA7BB41.4070507@erg.abdn.ac.uk> Date: Tue, 13 Mar 2018 11:51:29 +0000 From: Gorry Fairhurst Reply-To: gorry@erg.abdn.ac.uk Organization: University of Aberdeen User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: "Scharf, Michael (Nokia - DE/Stuttgart)" CC: "tcpm-chairs@ietf.org" , "tsvwg-chairs@ietf.org" References: <5A9BEB65.6010102@erg.abdn.ac.uk> <430A7C48-DA1D-4D73-AB40-F2B30A8E8580@lurchi.franken.de> <5AA7A614.3050706@erg.abdn.ac.uk> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 11:52:13 -0000 On 13/03/2018, 11:23, Scharf, Michael (Nokia - DE/Stuttgart) wrote: >> As for TSVWG, we have had quite a long discussion with the authors at the >> meeting and after. The TSV chairs encouraged them to take the CC aspects >> separately and explain why this method is better and detail what this benefit >> is and what is required in the router to allow this. We suggested an initial talk >> in ICCRG to present results and show *why* this is attractive. As far as I know >> they requested time to do this. > ICCRG is the right home for this. And the TCPM charter explicitly allows us to move topics there... > > I have written a PhD thesis on exactly this topic; we had a network processor implementation of Quick-Start, and our use cases was actually augmented/virtual reality... And I run into tons of fundamental issues 10 years ago, which are not easy to solve and not even mentioned in the I-Ds. So I somehow feel qualified to give feedback on what they have to look at more in detail 😉 > >> They also requested time in TSVWG - but there's (as yet) been little discssion >> on the list, so we curently advise them to prepare a slide to show to say why >> people should read the draft. We have not decided (yet) to give time to this >> new framework. > I personally believe that for new ideas the IETF should give a presentation slot *once*. For a second presentation the bar should be higher. If the framework draft has been presented already in TSVWG, IMHO further discussion on that belongs now on the list. > >> They have now also requested time in TCPM. > The draft is very specific about TCP congestion control, so in principle it belongs into TCPM. In general, I think TCPM should be open to new ideas. But my own thinking is that this can be at best a "if time permits" presentation in TCPM. > >> I don't know whethere this time they are also requesting slots some other >> places to discuss other aspects. >> >> I also suggested (informally) that they should try making a great short >> presentation of how this is a new opportunity and whar has changed since >> we last saw schemes proposed. I do see that there are significant advances in >> router forwarding hardware - and I suspect there could be similar ideas in >> cisco, etc.Would other vendors (or operators) be interested in standardising >> this? I think such a talk could be put to TSVAREA. > I am only at the IETF on Sunday evening and Monday morning. Unfortunately, I may not be in TSVAREA as I have to go back to the airport. > > I doubt that other people who are familiar with RTG and OPS area will show up in TSVAREA (but I may be wrong). It is pointless to discuss traffic engineering and OAM in router hardware without RTG area input. In RTG and OPS area, the level of multi-vendor support of a document can typically be seen in the author list. > > Michael > I suspect it is far too late to use TSVAREA for this at the coming IETF. Actually, to be more clear --- I am **NOT** against some sort of evolution in the network, and figuring out how best transports interact with this. I still have people working on this, I see newer router designs as more inviting, I still see appetite to do this. But like you, I **KNOW** there some big obtsacles and pitfalls. I am wondering how best to bring this sort of work to the IETF and get good perspective on the problems and solutions. After PLUS was short down by Privacy, I'd hate the next new thing to be shot down for the wrong reason. Gorry From nobody Tue Mar 13 05:10:57 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9E63912D890; Tue, 13 Mar 2018 05:10:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.921 X-Spam-Level: X-Spam-Status: No, score=-1.921 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=nokia.onmicrosoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CBKdGqkMSnPi; Tue, 13 Mar 2018 05:10:54 -0700 (PDT) Received: from EUR02-HE1-obe.outbound.protection.outlook.com (mail-eopbgr10128.outbound.protection.outlook.com [40.107.1.128]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A37AC12711B; 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charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3b430008-f05a-45c9-120e-08d588db767d X-MS-Exchange-CrossTenant-originalarrivaltime: 13 Mar 2018 12:10:50.8055 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0701MB3010 Archived-At: Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 12:10:56 -0000 PiBBY3R1YWxseSwgdG8gYmUgbW9yZSBjbGVhciAtLS0gSSBhbSAqKk5PVCoqIGFnYWluc3Qgc29t ZSBzb3J0IG9mIGV2b2x1dGlvbiBpbg0KPiB0aGUgbmV0d29yaywgYW5kIGZpZ3VyaW5nIG91dCBo b3cgYmVzdCB0cmFuc3BvcnRzIGludGVyYWN0IHdpdGggdGhpcy4NCj4gDQo+IEkgc3RpbGwgaGF2 ZSBwZW9wbGUgd29ya2luZyBvbiB0aGlzLCBJIHNlZSBuZXdlciByb3V0ZXIgZGVzaWducyBhcyBt b3JlDQo+IGludml0aW5nLCBJIHN0aWxsIHNlZSBhcHBldGl0ZSB0byBkbyB0aGlzLiBCdXQgbGlr ZSB5b3UsIEkgKipLTk9XKiogdGhlcmUgc29tZQ0KPiBiaWcgb2J0c2FjbGVzIGFuZCBwaXRmYWxs cy4gSSBhbSB3b25kZXJpbmcgaG93IGJlc3QgdG8gYnJpbmcgdGhpcyBzb3J0IG9mIHdvcmsNCj4g dG8gdGhlIElFVEYgYW5kIGdldCBnb29kIHBlcnNwZWN0aXZlIG9uIHRoZSBwcm9ibGVtcyBhbmQg c29sdXRpb25zLiBBZnRlcg0KPiBQTFVTIHdhcyBzaG9ydCBkb3duIGJ5IFByaXZhY3ksIEknZCBo YXRlIHRoZSBuZXh0IG5ldyB0aGluZyB0byBiZSBzaG90IGRvd24NCj4gZm9yIHRoZSB3cm9uZyBy ZWFzb24uDQoNCldpdGhvdXQgYSBidXktaW4gZnJvbSBSVEcgYW5kIE9QUyBhcmVhLCBJIGJlbGll dmUgdGhpcyBzb3J0IG9mIGlkZWFzIHdvbid0IGdldCBmYXIgaW4gdGhlIElFVEYuDQoNCkZvciB3 aGF0IGl0IGlzIHdvcnRoLCBJIGF0dGVuZCBhIGxvdCBvZiBSVEcgYW5kIE9QUyBzZXNzaW9ucy4g TXkgaW1wcmVzc2lvbiBpcyB0aGF0IGl0IG1heSBub3QgYmUgdHJpdmlhbCB0byBicmlkZ2UgdGhl IGdhcCBiZXR3ZWVuIFRTViBhbmQgUlRHIGNvbW11bml0aWVzLiBCdXQgdGhpcyBpcyB3aGF0IHdv dWxkIGFjdHVhbGx5IGJlIHJlcXVpcmVkIHRvIG1ha2Ugc3VjaCBhIHByb3Bvc2FsIHN1Y2Nlc3Nm dWwuDQoNCk1pY2hhZWwgDQogDQo= From nobody Tue Mar 13 05:11:36 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3B7F312711B; 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Tue, 13 Mar 2018 13:11:25 +0100 From: Michael Welzl Message-Id: Content-Type: multipart/alternative; boundary="Apple-Mail=_DDE17371-798F-480C-AC7E-954D83333A04" Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Date: Tue, 13 Mar 2018 13:11:13 +0100 In-Reply-To: <5AA7BB41.4070507@erg.abdn.ac.uk> Cc: "Scharf, Michael (Nokia - DE/Stuttgart)" , "tcpm-chairs@ietf.org" , "tsvwg-chairs@ietf.org" , Jana Iyengar To: " Fairhurst" References: <5A9BEB65.6010102@erg.abdn.ac.uk> <430A7C48-DA1D-4D73-AB40-F2B30A8E8580@lurchi.franken.de> <5AA7A614.3050706@erg.abdn.ac.uk> <5AA7BB41.4070507@erg.abdn.ac.uk> X-Mailer: Apple Mail (2.3273) X-UiO-SPF-Received: Received-SPF: neutral (mail-mx01.uio.no: 160.80.82.29 is neither permitted nor denied by domain of ifi.uio.no) client-ip=160.80.82.29; envelope-from=michawe@ifi.uio.no; helo=[160.80.82.29]; X-UiO-Spam-info: not spam, SpamAssassin (score=-5.0, required=5.0, autolearn=disabled, HTML_MESSAGE=0.001, UIO_MAIL_IS_INTERNAL=-5, uiobl=NO, uiouri=NO) X-UiO-Scanned: 64415FD5CD9192E53F14B7BB878C252CD5666AA6 Archived-At: Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 12:11:34 -0000 --Apple-Mail=_DDE17371-798F-480C-AC7E-954D83333A04 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi folks! I am puzzled as to why I receive this - has someone put me in bcc? = AFAIK, I=E2=80=99m not in tcpm-chairs, not in tsvwg-chairs, and I=E2=80=99= m also happy to remind people that I=E2=80=99m *not* chairing ICCRG = anymore! :-) Anyway, to me, this also sounds like ICCRG material - but I haven=E2=80=99= t read the draft and so I probably shouldn=E2=80=99t even comment. But FWIW, I=E2=80=99d enjoy seeing this in ICCRG. I might even ask = something at the mic, just to see how that feels. I=E2=80=99m cc=E2=80=99ing the ICCRG chair, Jana, because it seems that = this should have reached him. Jana - I actually even can=E2=80=99t fully figure out what these folks = here are talking about: either this draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc = or that draft: https://tools.ietf.org/html/draft-lochin-ietf-tsvwg-gtfrc-02 = I think it=E2=80=99s the upper one. Cheers, Michael > On Mar 13, 2018, at 12:51 PM, Gorry Fairhurst = wrote: >=20 > On 13/03/2018, 11:23, Scharf, Michael (Nokia - DE/Stuttgart) wrote: >>> As for TSVWG, we have had quite a long discussion with the authors = at the >>> meeting and after. The TSV chairs encouraged them to take the CC = aspects >>> separately and explain why this method is better and detail what = this benefit >>> is and what is required in the router to allow this. We suggested an = initial talk >>> in ICCRG to present results and show *why* this is attractive. As = far as I know >>> they requested time to do this. >> ICCRG is the right home for this. And the TCPM charter explicitly = allows us to move topics there... >>=20 >> I have written a PhD thesis on exactly this topic; we had a network = processor implementation of Quick-Start, and our use cases was actually = augmented/virtual reality... And I run into tons of fundamental issues = 10 years ago, which are not easy to solve and not even mentioned in the = I-Ds. So I somehow feel qualified to give feedback on what they have to = look at more in detail =F0=9F=98=89 >>=20 >>> They also requested time in TSVWG - but there's (as yet) been little = discssion >>> on the list, so we curently advise them to prepare a slide to show = to say why >>> people should read the draft. We have not decided (yet) to give time = to this >>> new framework. >> I personally believe that for new ideas the IETF should give a = presentation slot *once*. For a second presentation the bar should be = higher. If the framework draft has been presented already in TSVWG, IMHO = further discussion on that belongs now on the list. >>=20 >>> They have now also requested time in TCPM. >> The draft is very specific about TCP congestion control, so in = principle it belongs into TCPM. In general, I think TCPM should be open = to new ideas. But my own thinking is that this can be at best a "if time = permits" presentation in TCPM. >>=20 >>> I don't know whethere this time they are also requesting slots some = other >>> places to discuss other aspects. >>>=20 >>> I also suggested (informally) that they should try making a great = short >>> presentation of how this is a new opportunity and whar has changed = since >>> we last saw schemes proposed. I do see that there are significant = advances in >>> router forwarding hardware - and I suspect there could be similar = ideas in >>> cisco, etc.Would other vendors (or operators) be interested in = standardising >>> this? I think such a talk could be put to TSVAREA. >> I am only at the IETF on Sunday evening and Monday morning. = Unfortunately, I may not be in TSVAREA as I have to go back to the = airport. >>=20 >> I doubt that other people who are familiar with RTG and OPS area will = show up in TSVAREA (but I may be wrong). It is pointless to discuss = traffic engineering and OAM in router hardware without RTG area input. = In RTG and OPS area, the level of multi-vendor support of a document can = typically be seen in the author list. >>=20 >> Michael >>=20 > I suspect it is far too late to use TSVAREA for this at the coming = IETF. >=20 > Actually, to be more clear --- I am **NOT** against some sort of = evolution in the network, and figuring out how best transports interact = with this. >=20 > I still have people working on this, I see newer router designs as = more inviting, I still see appetite to do this. But like you, I **KNOW** = there some big obtsacles and pitfalls. I am wondering how best to bring = this sort of work to the IETF and get good perspective on the problems = and solutions. After PLUS was short down by Privacy, I'd hate the next = new thing to be shot down for the wrong reason. >=20 > Gorry >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm --Apple-Mail=_DDE17371-798F-480C-AC7E-954D83333A04 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hi folks!

I= am puzzled as to why I receive this - has someone put me in bcc? =  AFAIK, I=E2=80=99m not in tcpm-chairs, not in tsvwg-chairs, and = I=E2=80=99m also happy to remind people that I=E2=80=99m *not* chairing = ICCRG anymore!  :-)

Anyway, to me, this also sounds like ICCRG material - but I = haven=E2=80=99t read the draft and so I probably shouldn=E2=80=99t even = comment.
But FWIW, I=E2=80=99d enjoy seeing this in = ICCRG. I might even ask something at the mic, just to see how that = feels.

I=E2=80=99= m cc=E2=80=99ing the ICCRG chair, Jana, because it seems that this = should have reached him.

Jana - I actually even can=E2=80=99t fully figure out what = these folks here are talking about: either this draft:
https://datatracker.ietf.org/doc/draft-han-tsvwg-cc
or that draft:
https://tools.ietf.org/html/draft-lochin-ietf-tsvwg-gtfrc-02

I think = it=E2=80=99s the upper one.

Cheers,
Michael


On Mar 13, 2018, at 12:51 PM, = Gorry Fairhurst <gorry@erg.abdn.ac.uk> wrote:

On = 13/03/2018, 11:23, Scharf, Michael (Nokia - DE/Stuttgart) wrote:
As for TSVWG, we have had quite a long discussion with the = authors at the
meeting and after. The TSV chairs = encouraged them to take the CC aspects
separately and = explain why this method is better and detail what this benefit
is and what is required in the router to allow this. We = suggested an initial talk
in ICCRG to present results and = show *why* this is attractive. As far as I know
they = requested time to do this.
ICCRG is the right = home for this. And the TCPM charter explicitly allows us to move topics = there...

I have written a PhD thesis on = exactly this topic; we had a network processor implementation of = Quick-Start, and our use cases was actually augmented/virtual reality... = And I run into tons of fundamental issues 10 years ago, which are not = easy to solve and not even mentioned in the I-Ds. So I somehow feel = qualified to give feedback on what they have to look at more in detail = =F0=9F=98=89

They also requested time in TSVWG - but there's (as yet) been = little discssion
on the list, so we curently advise them = to prepare a slide to show to say why
people should read = the draft. We have not decided (yet) to give time to this
new framework.
I personally = believe that for new ideas the IETF should give a presentation slot = *once*. For a second presentation the bar should be higher. If the = framework draft has been presented already in TSVWG, IMHO further = discussion on that belongs now on the list.

They have now also = requested time in TCPM.
The draft is very = specific about TCP congestion control, so in principle it belongs into = TCPM. In general, I think TCPM should be open to new ideas. But my own = thinking is that this can be at best a "if time permits" presentation in = TCPM.

I = don't know whethere this time they are also requesting slots some = other
places to discuss other aspects.

I also suggested (informally) that they should try making a = great short
presentation of how this is a new opportunity = and whar has changed since
we last saw schemes proposed. I = do see that there are significant advances in
router = forwarding hardware - and I suspect there could be similar ideas in
cisco, etc.Would other vendors (or operators) be interested = in standardising
this? I think such a talk could be put to = TSVAREA.
I am only at the IETF on Sunday = evening and Monday morning. Unfortunately, I may not be in TSVAREA as I = have to go back to the airport.

I doubt = that other people who are familiar with RTG and OPS area will show up in = TSVAREA (but I may be wrong). It is pointless to discuss traffic = engineering and OAM in router hardware without RTG area input. In RTG = and OPS area, the level of multi-vendor support of a document can = typically be seen in the author list.

Michael

I suspect = it is far too late to use TSVAREA for this at the coming IETF.

Actually, to be more clear --- I am **NOT** = against some sort of evolution in the network, and figuring out how best = transports interact with this.

I still have = people working on this, I see newer router designs as more inviting, I = still see appetite to do this. But like you, I **KNOW** there some big = obtsacles and pitfalls. I am wondering how best to bring this sort of = work to the IETF and get good perspective on the problems and solutions. = After PLUS was short down by Privacy, I'd hate the next new thing to be = shot down for the wrong reason.

Gorry

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= --Apple-Mail=_DDE17371-798F-480C-AC7E-954D83333A04-- From nobody Tue Mar 13 05:15:40 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2006912711B for ; Tue, 13 Mar 2018 05:15:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=simula-no.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mcxiKvwUv4qM for ; Tue, 13 Mar 2018 05:15:36 -0700 (PDT) Received: from mail-lf0-x234.google.com (mail-lf0-x234.google.com [IPv6:2a00:1450:4010:c07::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DC38712D892 for ; Tue, 13 Mar 2018 05:15:35 -0700 (PDT) Received: by mail-lf0-x234.google.com with SMTP id a22-v6so6501053lfg.9 for ; Tue, 13 Mar 2018 05:15:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=simula-no.20150623.gappssmtp.com; s=20150623; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=+rWh/n3Ts65CbxfIMG2fY6TB9k952Y2AWjjmhdz/8Fs=; b=nlSb3mikXsC8BI/C253Woi08S54N0q2ENPIXrV7XEJorn8F23aCN6slQcdYLBZPG7H 4LQFdk4OCwGTnBXBfu684/a/VCTToSoOoSHIzXie1BbNxirflVIi2QZwhhVwEbzIsjMd hZZHdLxrPmlc1tYTPhuffppTDHI5jX2X/XCVNUiVeUh87NHoc0+VO7A15GRJs+IktHTX Vy1BIVJhnaCLfeN6G+xTa+wQZNJ+OMaW4Iv44FAc9R7pVc0Y1vpazmtbQUQ3PubaPcOf Oem0Z7ZVglkYj4IyO/ntMT5qWwC2NU5AUnP58KuRT0S7WPHAXQkLxHEA04nj4Ucxc7Q+ j50Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=+rWh/n3Ts65CbxfIMG2fY6TB9k952Y2AWjjmhdz/8Fs=; b=fDO5eKMqGrmRhP2PVeF27vrkjTzBY2FGachAlvOMCiv+PZFGz1ALfi9SAhjNjzhGwB oRCOdcF6/emVZi0OKvXPXRVQT7LOKcjU1Cl6HD3CiQONe5Y79VMZ7b5dPHkQUosfqvwZ LIr/WxzHmAZDyM2JPnYu2lnWcFu5ErPyJZGSbuBJSH51bHYl6Dk590/mFLKDexLWn/u3 BH3vOq8fh59qryKAnf8l2TWckc7UZW6g8YFqnmzWO1FlmbOw8M2YWpLFTSm+rvmrYI7e AsNHdR7J+Ci2VbdteeC9esbYdGtRu9hCoS1ligbYcQ12kO+elK/jjLekbeqw22oi2zDj FwOw== X-Gm-Message-State: AElRT7H/32XO1GZ8L1F2cCqdx9t9/PXCe4YRNKOiCHKgIFxFqurRzj7J 92NCGvMWjtWNJCC4yrWeu5JK8w== X-Google-Smtp-Source: AG47ELs3GIHFXHCHL2bQNFBT1dxknA16bgEEQPv96csEk6RxOQJB9kR4iJ96Xh0vdct7U/W+mEmyxw== X-Received: by 2002:a19:15d9:: with SMTP id 86-v6mr349135lfv.96.1520943334060; Tue, 13 Mar 2018 05:15:34 -0700 (PDT) Received: from ?IPv6:2a02:270:2014:40:3dda:98be:40b:47aa? ([2a02:270:2014:40:3dda:98be:40b:47aa]) by smtp.gmail.com with ESMTPSA id f70-v6sm23131lfi.4.2018.03.13.05.15.32 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 13 Mar 2018 05:15:33 -0700 (PDT) From: David Ros Message-Id: <12981CEA-7472-4AF8-92A3-49775FD92613@simula.no> Content-Type: multipart/alternative; boundary="Apple-Mail=_50052335-ACA3-423A-9FD1-C781FBF9494D" Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Date: Tue, 13 Mar 2018 13:15:31 +0100 In-Reply-To: Cc: Gorry Fairhurst , "tcpm-chairs@ietf.org" , "tsvwg-chairs@ietf.org" , Jana Iyengar To: Michael Welzl References: <5A9BEB65.6010102@erg.abdn.ac.uk> <430A7C48-DA1D-4D73-AB40-F2B30A8E8580@lurchi.franken.de> <5AA7A614.3050706@erg.abdn.ac.uk> <5AA7BB41.4070507@erg.abdn.ac.uk> X-Mailer: Apple Mail (2.3273) Archived-At: Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 12:15:39 -0000 --Apple-Mail=_50052335-ACA3-423A-9FD1-C781FBF9494D Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi, Erm, this former ICCRG chair is also getting all these messages, and = hadn=E2=80=99t noticed until now that he was being bcc=E2=80=99ed=E2=80=A6= is this a bug or a feature? :) Cheers, David > On 13 Mar 2018, at 13:11, Michael Welzl wrote: >=20 > Hi folks! >=20 > I am puzzled as to why I receive this - has someone put me in bcc? = AFAIK, I=E2=80=99m not in tcpm-chairs, not in tsvwg-chairs, and I=E2=80=99= m also happy to remind people that I=E2=80=99m *not* chairing ICCRG = anymore! :-) >=20 > Anyway, to me, this also sounds like ICCRG material - but I haven=E2=80=99= t read the draft and so I probably shouldn=E2=80=99t even comment. > But FWIW, I=E2=80=99d enjoy seeing this in ICCRG. I might even ask = something at the mic, just to see how that feels. >=20 > I=E2=80=99m cc=E2=80=99ing the ICCRG chair, Jana, because it seems = that this should have reached him. >=20 > Jana - I actually even can=E2=80=99t fully figure out what these folks = here are talking about: either this draft: > https://datatracker.ietf.org/doc/draft-han-tsvwg-cc = > or that draft: > https://tools.ietf.org/html/draft-lochin-ietf-tsvwg-gtfrc-02 = >=20 > I think it=E2=80=99s the upper one. >=20 > Cheers, > Michael >=20 >=20 >> On Mar 13, 2018, at 12:51 PM, Gorry Fairhurst > wrote: >>=20 >> On 13/03/2018, 11:23, Scharf, Michael (Nokia - DE/Stuttgart) wrote: >>>> As for TSVWG, we have had quite a long discussion with the authors = at the >>>> meeting and after. The TSV chairs encouraged them to take the CC = aspects >>>> separately and explain why this method is better and detail what = this benefit >>>> is and what is required in the router to allow this. We suggested = an initial talk >>>> in ICCRG to present results and show *why* this is attractive. As = far as I know >>>> they requested time to do this. >>> ICCRG is the right home for this. And the TCPM charter explicitly = allows us to move topics there... >>>=20 >>> I have written a PhD thesis on exactly this topic; we had a network = processor implementation of Quick-Start, and our use cases was actually = augmented/virtual reality... And I run into tons of fundamental issues = 10 years ago, which are not easy to solve and not even mentioned in the = I-Ds. So I somehow feel qualified to give feedback on what they have to = look at more in detail =F0=9F=98=89 >>>=20 >>>> They also requested time in TSVWG - but there's (as yet) been = little discssion >>>> on the list, so we curently advise them to prepare a slide to show = to say why >>>> people should read the draft. We have not decided (yet) to give = time to this >>>> new framework. >>> I personally believe that for new ideas the IETF should give a = presentation slot *once*. For a second presentation the bar should be = higher. If the framework draft has been presented already in TSVWG, IMHO = further discussion on that belongs now on the list. >>>=20 >>>> They have now also requested time in TCPM. >>> The draft is very specific about TCP congestion control, so in = principle it belongs into TCPM. In general, I think TCPM should be open = to new ideas. But my own thinking is that this can be at best a "if time = permits" presentation in TCPM. >>>=20 >>>> I don't know whethere this time they are also requesting slots some = other >>>> places to discuss other aspects. >>>>=20 >>>> I also suggested (informally) that they should try making a great = short >>>> presentation of how this is a new opportunity and whar has changed = since >>>> we last saw schemes proposed. I do see that there are significant = advances in >>>> router forwarding hardware - and I suspect there could be similar = ideas in >>>> cisco, etc.Would other vendors (or operators) be interested in = standardising >>>> this? I think such a talk could be put to TSVAREA. >>> I am only at the IETF on Sunday evening and Monday morning. = Unfortunately, I may not be in TSVAREA as I have to go back to the = airport. >>>=20 >>> I doubt that other people who are familiar with RTG and OPS area = will show up in TSVAREA (but I may be wrong). It is pointless to discuss = traffic engineering and OAM in router hardware without RTG area input. = In RTG and OPS area, the level of multi-vendor support of a document can = typically be seen in the author list. >>>=20 >>> Michael >>>=20 >> I suspect it is far too late to use TSVAREA for this at the coming = IETF. >>=20 >> Actually, to be more clear --- I am **NOT** against some sort of = evolution in the network, and figuring out how best transports interact = with this. >>=20 >> I still have people working on this, I see newer router designs as = more inviting, I still see appetite to do this. But like you, I **KNOW** = there some big obtsacles and pitfalls. I am wondering how best to bring = this sort of work to the IETF and get good perspective on the problems = and solutions. After PLUS was short down by Privacy, I'd hate the next = new thing to be shot down for the wrong reason. >>=20 >> Gorry >>=20 >> _______________________________________________ >> tcpm mailing list >> tcpm@ietf.org >> https://www.ietf.org/mailman/listinfo/tcpm >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm --Apple-Mail=_50052335-ACA3-423A-9FD1-C781FBF9494D Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
Hi,

Erm, this former ICCRG chair is also = getting all these messages, and hadn=E2=80=99t noticed until now that he = was being bcc=E2=80=99ed=E2=80=A6 is this a bug or a feature? = :)

Cheers,

David

On 13 Mar 2018, at 13:11, Michael Welzl = <michawe@ifi.uio.no> wrote:

Hi folks!

I am puzzled as to why I = receive this - has someone put me in bcc?  AFAIK, I=E2=80=99m not = in tcpm-chairs, not in tsvwg-chairs, and I=E2=80=99m also happy to = remind people that I=E2=80=99m *not* chairing ICCRG anymore! =  :-)

Anyway, to me, this also sounds like ICCRG material - but I = haven=E2=80=99t read the draft and so I probably shouldn=E2=80=99t even = comment.
But FWIW, I=E2=80=99d enjoy seeing this in = ICCRG. I might even ask something at the mic, just to see how that = feels.

I=E2=80=99= m cc=E2=80=99ing the ICCRG chair, Jana, because it seems that this = should have reached him.

Jana - I actually even can=E2=80=99t fully figure out what = these folks here are talking about: either this draft:
https://datatracker.ietf.org/doc/draft-han-tsvwg-cc
or that draft:
https://tools.ietf.org/html/draft-lochin-ietf-tsvwg-gtfrc-02

I think = it=E2=80=99s the upper one.

Cheers,
Michael


On Mar = 13, 2018, at 12:51 PM, Gorry Fairhurst <gorry@erg.abdn.ac.uk> wrote:

On = 13/03/2018, 11:23, Scharf, Michael (Nokia - DE/Stuttgart) wrote:
As for TSVWG, we have had quite a long discussion with the = authors at the
meeting and after. The TSV chairs = encouraged them to take the CC aspects
separately and = explain why this method is better and detail what this benefit
is and what is required in the router to allow this. We = suggested an initial talk
in ICCRG to present results and = show *why* this is attractive. As far as I know
they = requested time to do this.
ICCRG is the right = home for this. And the TCPM charter explicitly allows us to move topics = there...

I have written a PhD thesis on = exactly this topic; we had a network processor implementation of = Quick-Start, and our use cases was actually augmented/virtual reality... = And I run into tons of fundamental issues 10 years ago, which are not = easy to solve and not even mentioned in the I-Ds. So I somehow feel = qualified to give feedback on what they have to look at more in detail = =F0=9F=98=89

They also requested time in TSVWG - but there's (as yet) been = little discssion
on the list, so we curently advise them = to prepare a slide to show to say why
people should read = the draft. We have not decided (yet) to give time to this
new framework.
I personally = believe that for new ideas the IETF should give a presentation slot = *once*. For a second presentation the bar should be higher. If the = framework draft has been presented already in TSVWG, IMHO further = discussion on that belongs now on the list.

They have now also = requested time in TCPM.
The draft is very = specific about TCP congestion control, so in principle it belongs into = TCPM. In general, I think TCPM should be open to new ideas. But my own = thinking is that this can be at best a "if time permits" presentation in = TCPM.

I = don't know whethere this time they are also requesting slots some = other
places to discuss other aspects.

I also suggested (informally) that they should try making a = great short
presentation of how this is a new opportunity = and whar has changed since
we last saw schemes proposed. I = do see that there are significant advances in
router = forwarding hardware - and I suspect there could be similar ideas in
cisco, etc.Would other vendors (or operators) be interested = in standardising
this? I think such a talk could be put to = TSVAREA.
I am only at the IETF on Sunday = evening and Monday morning. Unfortunately, I may not be in TSVAREA as I = have to go back to the airport.

I doubt = that other people who are familiar with RTG and OPS area will show up in = TSVAREA (but I may be wrong). It is pointless to discuss traffic = engineering and OAM in router hardware without RTG area input. In RTG = and OPS area, the level of multi-vendor support of a document can = typically be seen in the author list.

Michael

I suspect = it is far too late to use TSVAREA for this at the coming IETF.

Actually, to be more clear --- I am **NOT** = against some sort of evolution in the network, and figuring out how best = transports interact with this.

I still have = people working on this, I see newer router designs as more inviting, I = still see appetite to do this. But like you, I **KNOW** there some big = obtsacles and pitfalls. I am wondering how best to bring this sort of = work to the IETF and get good perspective on the problems and solutions. = After PLUS was short down by Privacy, I'd hate the next new thing to be = shot down for the wrong reason.

Gorry

_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm

_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm

= --Apple-Mail=_50052335-ACA3-423A-9FD1-C781FBF9494D-- From nobody Tue Mar 13 05:23:31 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4799012D892; Tue, 13 Mar 2018 05:23:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.909 X-Spam-Level: X-Spam-Status: No, score=-1.909 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Rk-ZHOkvaQtL; Tue, 13 Mar 2018 05:23:28 -0700 (PDT) Received: from pegasus.erg.abdn.ac.uk (pegasus.erg.abdn.ac.uk [IPv6:2001:630:241:204::f0f0]) by ietfa.amsl.com (Postfix) with ESMTP id 1C5BA1241F5; Tue, 13 Mar 2018 05:23:28 -0700 (PDT) Received: from Gs-MacBook-Pro.local (at-zeroshell-1.erg.abdn.ac.uk [139.133.217.68]) by pegasus.erg.abdn.ac.uk (Postfix) with ESMTPA id C80361B0012A; Tue, 13 Mar 2018 12:22:51 +0000 (GMT) Message-ID: <5AA7C29B.50809@erg.abdn.ac.uk> Date: Tue, 13 Mar 2018 12:22:51 +0000 From: Gorry Fairhurst Reply-To: gorry@erg.abdn.ac.uk Organization: University of Aberdeen User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: David Ros CC: Michael Welzl , "tcpm-chairs@ietf.org" , "tsvwg-chairs@ietf.org" , Jana Iyengar References: <5A9BEB65.6010102@erg.abdn.ac.uk> <430A7C48-DA1D-4D73-AB40-F2B30A8E8580@lurchi.franken.de> <5AA7A614.3050706@erg.abdn.ac.uk> <5AA7BB41.4070507@erg.abdn.ac.uk> <12981CEA-7472-4AF8-92A3-49775FD92613@simula.no> In-Reply-To: <12981CEA-7472-4AF8-92A3-49775FD92613@simula.no> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 12:23:30 -0000 David: You need to prune youself from the tracker mail exploder lists - or get your co-chairs to ask the secretariat this ;-) ... Otherwise you'll still feel compelled to read this. Gorry On 13/03/2018, 12:15, David Ros wrote: > Hi, > > Erm, this former ICCRG chair is also getting all these messages, and > hadn’t noticed until now that he was being bcc’ed… is this a bug or a > feature? :) > > Cheers, > > David > >> On 13 Mar 2018, at 13:11, Michael Welzl > > wrote: >> >> Hi folks! >> >> I am puzzled as to why I receive this - has someone put me in bcc? >> AFAIK, I’m not in tcpm-chairs, not in tsvwg-chairs, and I’m also >> happy to remind people that I’m *not* chairing ICCRG anymore! :-) >> >> Anyway, to me, this also sounds like ICCRG material - but I haven’t >> read the draft and so I probably shouldn’t even comment. >> But FWIW, I’d enjoy seeing this in ICCRG. I might even ask something >> at the mic, just to see how that feels. >> >> I’m cc’ing the ICCRG chair, Jana, because it seems that this should >> have reached him. >> >> Jana - I actually even can’t fully figure out what these folks here >> are talking about: either this draft: >> https://datatracker.ietf.org/doc/draft-han-tsvwg-cc >> or that draft: >> https://tools.ietf.org/html/draft-lochin-ietf-tsvwg-gtfrc-02 >> >> I think it’s the upper one. >> >> Cheers, >> Michael >> >> >>> On Mar 13, 2018, at 12:51 PM, Gorry Fairhurst >> > wrote: >>> >>> On 13/03/2018, 11:23, Scharf, Michael (Nokia - DE/Stuttgart) wrote: >>>>> As for TSVWG, we have had quite a long discussion with the authors >>>>> at the >>>>> meeting and after. The TSV chairs encouraged them to take the CC >>>>> aspects >>>>> separately and explain why this method is better and detail what >>>>> this benefit >>>>> is and what is required in the router to allow this. We suggested >>>>> an initial talk >>>>> in ICCRG to present results and show *why* this is attractive. As >>>>> far as I know >>>>> they requested time to do this. >>>> ICCRG is the right home for this. And the TCPM charter explicitly >>>> allows us to move topics there... >>>> >>>> I have written a PhD thesis on exactly this topic; we had a network >>>> processor implementation of Quick-Start, and our use cases was >>>> actually augmented/virtual reality... And I run into tons of >>>> fundamental issues 10 years ago, which are not easy to solve and >>>> not even mentioned in the I-Ds. So I somehow feel qualified to give >>>> feedback on what they have to look at more in detail 😉 >>>> >>>>> They also requested time in TSVWG - but there's (as yet) been >>>>> little discssion >>>>> on the list, so we curently advise them to prepare a slide to show >>>>> to say why >>>>> people should read the draft. We have not decided (yet) to give >>>>> time to this >>>>> new framework. >>>> I personally believe that for new ideas the IETF should give a >>>> presentation slot *once*. For a second presentation the bar should >>>> be higher. If the framework draft has been presented already in >>>> TSVWG, IMHO further discussion on that belongs now on the list. >>>> >>>>> They have now also requested time in TCPM. >>>> The draft is very specific about TCP congestion control, so in >>>> principle it belongs into TCPM. In general, I think TCPM should be >>>> open to new ideas. But my own thinking is that this can be at best >>>> a "if time permits" presentation in TCPM. >>>> >>>>> I don't know whethere this time they are also requesting slots >>>>> some other >>>>> places to discuss other aspects. >>>>> >>>>> I also suggested (informally) that they should try making a great >>>>> short >>>>> presentation of how this is a new opportunity and whar has changed >>>>> since >>>>> we last saw schemes proposed. I do see that there are significant >>>>> advances in >>>>> router forwarding hardware - and I suspect there could be similar >>>>> ideas in >>>>> cisco, etc.Would other vendors (or operators) be interested in >>>>> standardising >>>>> this? I think such a talk could be put to TSVAREA. >>>> I am only at the IETF on Sunday evening and Monday morning. >>>> Unfortunately, I may not be in TSVAREA as I have to go back to the >>>> airport. >>>> >>>> I doubt that other people who are familiar with RTG and OPS area >>>> will show up in TSVAREA (but I may be wrong). It is pointless to >>>> discuss traffic engineering and OAM in router hardware without RTG >>>> area input. In RTG and OPS area, the level of multi-vendor support >>>> of a document can typically be seen in the author list. >>>> >>>> Michael >>>> >>> I suspect it is far too late to use TSVAREA for this at the coming IETF. >>> >>> Actually, to be more clear --- I am **NOT** against some sort of >>> evolution in the network, and figuring out how best transports >>> interact with this. >>> >>> I still have people working on this, I see newer router designs as >>> more inviting, I still see appetite to do this. But like you, I >>> **KNOW** there some big obtsacles and pitfalls. I am wondering how >>> best to bring this sort of work to the IETF and get good perspective >>> on the problems and solutions. After PLUS was short down by Privacy, >>> I'd hate the next new thing to be shot down for the wrong reason. >>> >>> Gorry >>> >>> _______________________________________________ >>> tcpm mailing list >>> tcpm@ietf.org >>> https://www.ietf.org/mailman/listinfo/tcpm >> >> _______________________________________________ >> tcpm mailing list >> tcpm@ietf.org >> https://www.ietf.org/mailman/listinfo/tcpm > From nobody Tue Mar 13 06:33:07 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5BB6112D942; Tue, 13 Mar 2018 06:33:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.209 X-Spam-Level: X-Spam-Status: No, score=-4.209 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cp3qcNN7KOH1; Tue, 13 Mar 2018 06:33:02 -0700 (PDT) Received: from mail-out02.uio.no (mail-out02.uio.no [IPv6:2001:700:100:8210::71]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AA164127337; Tue, 13 Mar 2018 06:33:01 -0700 (PDT) Received: from mail-mx06.uio.no ([129.240.10.40]) by mail-out02.uio.no with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1evk31-0008ld-HU; Tue, 13 Mar 2018 14:32:59 +0100 Received: from [160.80.82.29] by mail-mx06.uio.no with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) user michawe (Exim 4.90_1) (envelope-from ) id 1evk2v-0000j3-PG; Tue, 13 Mar 2018 14:32:59 +0100 From: Michael Welzl Content-Type: multipart/alternative; boundary="Apple-Mail=_E667FC21-BAAE-4E00-AD7D-81534BF97867" Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Message-Id: References: <5aa7bff2.89122e0a.62f45.0ddd.GMRIR@mx.google.com> To: "tcpm-chairs@ietf.org" , tsvwg-chairs@ietf.org Date: Tue, 13 Mar 2018 14:32:51 +0100 X-Mailer: Apple Mail (2.3273) X-UiO-SPF-Received: Received-SPF: neutral (mail-mx06.uio.no: 160.80.82.29 is neither permitted nor denied by domain of ifi.uio.no) client-ip=160.80.82.29; envelope-from=michawe@ifi.uio.no; helo=[160.80.82.29]; X-UiO-Spam-info: not spam, SpamAssassin (score=-5.0, required=5.0, autolearn=disabled, HTML_MESSAGE=0.001, UIO_MAIL_IS_INTERNAL=-5, uiobl=NO, uiouri=NO) X-UiO-Scanned: B2EC60EBDF826CA8C9BA23575B208470955DDF4B Archived-At: Subject: [tcpm] Fwd: Delivery Status Notification (Failure) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 13:33:05 -0000 --Apple-Mail=_E667FC21-BAAE-4E00-AD7D-81534BF97867 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 JFYI =E2=80=A6 and, hm - I don=E2=80=99t think this makes things = easier :( Maybe his mail box is just overloaded? Or maybe Google=E2=80=99s = internal emails now get delivered with BBR ?? ;-D > Begin forwarded message: >=20 > From: Mail Delivery Subsystem > Subject: Delivery Status Notification (Failure) > Date: March 13, 2018 at 1:11:30 PM GMT+1 > To: michawe@ifi.uio.no > Resent-From: >=20 >=20 > Message not delivered > There was a problem delivering your message to <>jri@google.com = . See the technical details below. > Reporting-MTA: dns; googlemail.com > Received-From-MTA: dns; michawe@ifi.uio.no > Arrival-Date: Tue, 13 Mar 2018 05:11:30 -0700 (PDT) > X-Original-Message-ID: = > >=20 > Final-Recipient: rfc822; jri@google.com > Action: failed > Status: 5.0.0 > Last-Attempt-Date: Tue, 13 Mar 2018 05:11:30 -0700 (PDT) >=20 > From: Michael Welzl > > Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 > Date: March 13, 2018 at 1:11:13 PM GMT+1 > To: "> Fairhurst" = > > Cc: "Scharf, Michael (Nokia - DE/Stuttgart)" >, "tcpm-chairs@ietf.org = " >, = "tsvwg-chairs@ietf.org " = >, Jana Iyengar = > >=20 >=20 > Hi folks! >=20 > I am puzzled as to why I receive this - has someone put me in bcc? = AFAIK, I=E2=80=99m not in tcpm-chairs, not in tsvwg-chairs, and I=E2=80=99= m also happy to remind people that I=E2=80=99m *not* chairing ICCRG = anymore! :-) >=20 > Anyway, to me, this also sounds like ICCRG material - but I haven=E2=80=99= t read the draft and so I probably shouldn=E2=80=99t even comment. > But FWIW, I=E2=80=99d enjoy seeing this in ICCRG. I might even ask = something at the mic, just to see how that feels. >=20 > I=E2=80=99m cc=E2=80=99ing the ICCRG chair, Jana, because it seems = that this should have reached him. >=20 > Jana - I actually even can=E2=80=99t fully figure out what these folks = here are talking about: either this draft: > https://datatracker.ietf.org/doc/draft-han-tsvwg-cc = = > > or that draft: > https://tools.ietf.org/html/draft-lochin-ietf-tsvwg-gtfrc-02 = = > >=20 > I think it=E2=80=99s the upper one. >=20 > Cheers, > Michael >=20 >=20 >> On Mar 13, 2018, at 12:51 PM, Gorry Fairhurst > wrote: >>=20 >> On 13/03/2018, 11:23, Scharf, Michael (Nokia - DE/Stuttgart) wrote: >>>> As for TSVWG, we have had quite a long discussion with the authors = at the >>>> meeting and after. The TSV chairs encouraged them to take the CC = aspects >>>> separately and explain why this method is better and detail what = this benefit >>>> is and what is required in the router to allow this. We suggested = an initial talk >>>> in ICCRG to present results and show *why* this is attractive. As = far as I know >>>> they requested time to do this. >>> ICCRG is the right home for this. And the TCPM charter explicitly = allows us to move topics there... >>>=20 >>> I have written a PhD thesis on exactly this topic; we had a network = processor implementation of Quick-Start, and our use cases was actually = augmented/virtual reality... And I run into tons of fundamental issues = 10 years ago, which are not easy to solve and not even mentioned in the = I-Ds. So I somehow feel qualified to give feedback on what they have to = look at more in detail =F0=9F=98=89 >>>=20 >>>> They also requested time in TSVWG - but there's (as yet) been = little discssion >>>> on the list, so we curently advise them to prepare a slide to show = to say why >>>> people should read the draft. We have not decided (yet) to give = time to this >>>> new framework. >>> I personally believe that for new ideas the IETF should give a = presentation slot *once*. For a second presentation the bar should be = higher. If the framework draft has been presented already in TSVWG, IMHO = further discussion on that belongs now on the list. >>>=20 >>>> They have now also requested time in TCPM. >>> The draft is very specific about TCP congestion control, so in = principle it belongs into TCPM. In general, I think TCPM should be open = to new ideas. But my own thinking is that this can be at best a "if time = permits" presentation in TCPM. >>>=20 >>>> I don't know whethere this time they are also requesting slots some = other >>>> places to discuss other aspects. >>>>=20 >>>> I also suggested (informally) that they should try making a great = short >>>> presentation of how this is a new opportunity and whar has changed = since >>>> we last saw schemes proposed. I do see that there are significant = advances in >>>> router forwarding hardware - and I suspect there could be similar = ideas in >>>> cisco, etc.Would other vendors (or operators) be interested in = standardising >>>> this? I think such a talk could be put to TSVAREA. >>> I am only at the IETF on Sunday evening and Monday morning. = Unfortunately, I may not be in TSVAREA as I have to go back to the = airport. >>>=20 >>> I doubt that other people who are familiar with RTG and OPS area = will show up in TSVAREA (but I may be wrong). It is > ----- Message truncated ----- --Apple-Mail=_E667FC21-BAAE-4E00-AD7D-81534BF97867 Content-Type: multipart/related; type="text/html"; boundary="Apple-Mail=_A2591A9C-12C2-49AF-987D-0A9CA23BEA03" --Apple-Mail=_A2591A9C-12C2-49AF-987D-0A9CA23BEA03 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 JFYI  =E2=80=A6  and, hm - I don=E2=80=99t think = this makes things easier  :(
Maybe his mail box is = just overloaded?  Or maybe Google=E2=80=99s internal emails now get = delivered with BBR ??   ;-D



Begin forwarded message:

From: = Mail Delivery Subsystem <mailer-daemon@googlemail.com>
Subject: = Delivery Status = Notification (Failure)
Date: = March 13, 2018 at 1:11:30 PM = GMT+1
To: = michawe@ifi.uio.no
Resent-From: <michawe@ifi.uio.no>

3D"Error

Message not delivered

There was a problem delivering your message to jri@google.com. = See the technical details = below.
Reporting-MTA: dns; googlemail.com
Received-From-MTA: dns; michawe@ifi.uio.no
Arrival-Date: Tue, 13 Mar 2018 05:11:30 = -0700 (PDT)
X-Original-Message-ID: = <FF54A053-F7ED-4B94-B229-62C03339316F@ifi.uio.no>

Final-Recipient: rfc822; jri@google.com
Action: failed
Status: 5.0.0
Last-Attempt-Date: Tue, 13 Mar 2018 05:11:30 = -0700 (PDT)
From: Michael Welzl <michawe@ifi.uio.no>
Subject: Re: [tcpm] [tsvwg] = Agenda requests for TSVWG@IETF101
Date: March 13, 2018 at 1:11:13 PM GMT+1
To: "<gorry@erg.abdn.ac.uk> Fairhurst" <gorry@erg.abdn.ac.uk>
Cc: "Scharf, Michael (Nokia - DE/Stuttgart)" <michael.scharf@nokia.com>, "tcpm-chairs@ietf.org" <tcpm@ietf.org>, "tsvwg-chairs@ietf.org" <tsvwg-chairs@ietf.org>, Jana Iyengar <jri@google.com>


Hi folks!

I am puzzled as to why I receive this - has = someone put me in bcc?  AFAIK, I=E2=80=99m not in tcpm-chairs, not = in tsvwg-chairs, and I=E2=80=99m also happy to remind people that I=E2=80=99= m *not* chairing ICCRG anymore!  :-)

Anyway, to me, this also sounds like ICCRG = material - but I haven=E2=80=99t read the draft and so I probably = shouldn=E2=80=99t even comment.
But FWIW, I=E2=80=99d enjoy seeing this in = ICCRG. I might even ask something at the mic, just to see how that = feels.
I=E2=80=99m cc=E2=80=99ing the ICCRG = chair, Jana, because it seems that this should have reached = him.
Jana - I actually even can=E2=80=99t = fully figure out what these folks here are talking about: either this = draft:
https://datatracker.ietf.org/doc/draft-han-tsvwg-cc <https://datatracker.ietf.org/doc/draft-han-tsvwg-cc>
or that draft:
https://tools.ietf.org/html/draft-lochin-ietf-tsvwg-gtfrc-02 <https://tools.ietf.org/html/draft-lochin-ietf-tsvwg-gtfrc-02>

I think it=E2=80=99s the upper one.

Cheers,
Michael


On Mar 13, 2018, at 12:51 = PM, Gorry Fairhurst <gorry@erg.abdn.ac.uk> wrote:

On 13/03/2018, 11:23, = Scharf, Michael (Nokia - DE/Stuttgart) wrote:
As for TSVWG, we have had quite a long = discussion with the authors at the
meeting and = after. The TSV chairs encouraged them to take the CC aspects
separately and explain why this method is better = and detail what this benefit
is and what is required = in the router to allow this. We suggested an initial talk
in ICCRG to present results and show *why* this = is attractive. As far as I know
they = requested time to do this.
ICCRG is = the right home for this. And the TCPM charter explicitly allows us to = move topics there...

I = have written a PhD thesis on exactly this topic; we had a network = processor implementation of Quick-Start, and our use cases was actually = augmented/virtual reality... And I run into tons of fundamental issues = 10 years ago, which are not easy to solve and not even mentioned in the = I-Ds. So I somehow feel qualified to give feedback on what they have to = look at more in detail =F0=9F=98=89

They = also requested time in TSVWG - but there's (as yet) been little = discssion
on the list, so we curently advise them = to prepare a slide to show to say why
people = should read the draft. We have not decided (yet) to give time to this
new framework.
I= personally believe that for new ideas the IETF should give a = presentation slot *once*. For a second presentation the bar should be = higher. If the framework draft has been presented already in TSVWG, IMHO = further discussion on that belongs now on the list.

They have now also requested time in TCPM.
The draft is very specific about = TCP congestion control, so in principle it belongs into TCPM. In = general, I think TCPM should be open to new ideas. But my own thinking = is that this can be at best a "if time permits" presentation in TCPM.

I don't know whethere this time they are also = requesting slots some other
places to discuss other = aspects.

I also = suggested (informally) that they should try making a great short
presentation of how this is a new opportunity = and whar has changed since
we last saw schemes = proposed. I do see that there are significant advances in
router forwarding hardware - and I suspect there = could be similar ideas in
cisco, etc.Would other = vendors (or operators) be interested in standardising
this? I think such a talk could be put to = TSVAREA.
I am only at the IETF on = Sunday evening and Monday morning. Unfortunately, I may not be in = TSVAREA as I have to go back to the airport.

I doubt that other people who are familiar with = RTG and OPS area will show up in TSVAREA (but I may be wrong). It is
----- Message truncated = -----

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--Apple-Mail=_A2591A9C-12C2-49AF-987D-0A9CA23BEA03-- --Apple-Mail=_E667FC21-BAAE-4E00-AD7D-81534BF97867-- From nobody Tue Mar 13 08:03:54 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B3214124B0A; Tue, 13 Mar 2018 08:03:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.209 X-Spam-Level: X-Spam-Status: No, score=-4.209 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yXp4_-dx-M0d; Tue, 13 Mar 2018 08:03:49 -0700 (PDT) Received: from mail-out02.uio.no (mail-out02.uio.no [IPv6:2001:700:100:8210::71]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7D816126D73; Tue, 13 Mar 2018 08:03:48 -0700 (PDT) Received: from mail-mx06.uio.no ([129.240.10.40]) by mail-out02.uio.no with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1evlSs-00043j-Md; Tue, 13 Mar 2018 16:03:46 +0100 Received: from [160.80.82.29] by mail-mx06.uio.no with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) user michawe (Exim 4.90_1) (envelope-from ) id 1evlSr-0006Uw-Hi; Tue, 13 Mar 2018 16:03:46 +0100 From: Michael Welzl Content-Type: multipart/alternative; boundary="Apple-Mail=_98492E22-7C7A-4722-861C-3C55A98900D4" Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Message-Id: Date: Tue, 13 Mar 2018 16:03:47 +0100 To: "tcpm-chairs@ietf.org" , tsvwg-chairs@ietf.org X-Mailer: Apple Mail (2.3273) X-UiO-SPF-Received: Received-SPF: neutral (mail-mx06.uio.no: 160.80.82.29 is neither permitted nor denied by domain of ifi.uio.no) client-ip=160.80.82.29; envelope-from=michawe@ifi.uio.no; helo=[160.80.82.29]; X-UiO-Spam-info: not spam, SpamAssassin (score=-5.0, required=5.0, autolearn=disabled, HTML_MESSAGE=0.001, UIO_MAIL_IS_INTERNAL=-5, uiobl=NO, uiouri=NO) X-UiO-Scanned: 9AAA1667AF8129B75727FB8E30D778EA8CCE94B4 Archived-At: Subject: [tcpm] Something's fishy here X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 15:03:52 -0000 --Apple-Mail=_98492E22-7C7A-4722-861C-3C55A98900D4 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hey all, David Ros and I received the last emails. In response to my previous one = about Jana, I also received answers from Lars and Patrick. I think that already makes four people who probably shouldn=E2=80=99t = get emails that are only sent to tcpm-chairs and tsvwg-chairs. So=E2=80=A6 check this out. I=E2=80=99m sending this email as a test, = again *only* to tcpm-chairs@ietf.org and = tsvwg-chairs@ietf.org If you=E2=80=99re not a chair of TCPM or TSVWG, something=E2=80=99s bad. = If, like me, you never even were one, something=E2=80=99s REALLY bad. Then, maybe someone could fix it=E2=80=A6 or have someone fix it? But I = guess one of the chairs of one of these groups perhaps - because these = seem to be the wrong =E2=80=9Cexploders=E2=80=9D to even contain people = like myself? Cheers, Michael PS: Because this email apparently will go out to many random people, = I=E2=80=99ll use this chance for a commercial break: = http://www.skinsofa.com At least one of the recipients is in Munich, only a short drive away = from Innsbruck where we=E2=80=99ll play a gig in Hard Rock Cafe on the = 20th of April. Just saying :-) --Apple-Mail=_98492E22-7C7A-4722-861C-3C55A98900D4 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hey all,

David Ros and I received the last emails. In response to my = previous one about Jana, I also received answers from Lars and = Patrick.
I think that already makes four people who = probably shouldn=E2=80=99t get emails that are only sent to tcpm-chairs = and tsvwg-chairs.

So=E2=80=A6 check this out. I=E2=80=99m sending this email as = a test, again *only* to tcpm-chairs@ietf.org and tsvwg-chairs@ietf.org

If you=E2=80=99re not a chair of TCPM = or TSVWG, something=E2=80=99s bad. If, like me, you never even were one, = something=E2=80=99s REALLY bad.

Then, maybe someone could fix it=E2=80=A6= or have someone fix it?  But I guess one of the chairs of one of = these groups perhaps - because these seem to be the wrong = =E2=80=9Cexploders=E2=80=9D to even contain people like = myself?

Cheers,
Michael

PS:  Because this email apparently = will go out to many random people, I=E2=80=99ll use this chance for a = commercial break: http://www.skinsofa.com
At least one = of the recipients is in Munich, only a short drive away from Innsbruck = where we=E2=80=99ll play a gig in Hard Rock Cafe on the 20th of April. = Just saying  :-)

= --Apple-Mail=_98492E22-7C7A-4722-861C-3C55A98900D4-- From nobody Tue Mar 13 08:05:49 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 68179126D73 for ; Tue, 13 Mar 2018 08:05:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=simula-no.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xRKTS_06IZKP for ; Tue, 13 Mar 2018 08:05:45 -0700 (PDT) Received: from mail-lf0-x231.google.com (mail-lf0-x231.google.com [IPv6:2a00:1450:4010:c07::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 06BE5124B0A for ; Tue, 13 Mar 2018 08:05:45 -0700 (PDT) Received: by mail-lf0-x231.google.com with SMTP id q69-v6so29276785lfi.10 for ; Tue, 13 Mar 2018 08:05:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=simula-no.20150623.gappssmtp.com; s=20150623; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=KTanNMf26Ogc8y/SFInEeLc7bHfEqwkWimyMxc7izBk=; b=gpt+UXHSPEMClHWCYe8j88vRF5/C8gtViovgECrTI89VuZiDzEgWymphicePvphIqx OEAOa8lQL4DKc9TjmLjmyGpYyvcA0WEtqHe84qNLOJJpCwoomjryQyWy4y7kHQUKzvAH SKg4e2b5sxFyYVl7/d9RYekzn9BpmkUDLGbkwIlcy5BoZz/D9bTRSJoS656SxwAHyK4c pPHkLDu+9DmgLp6alNzj/G/Z0jf8N8eLNYXw3gWXi3ow88DJ/RZcO0otlNHMGlgCBdk1 NYCBEMSdQAPqtl/wigmbjiPBbuMp1+vNpWUA/onz/aT61GZCatB8oX9It4TNly5+ddVM nQTw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=KTanNMf26Ogc8y/SFInEeLc7bHfEqwkWimyMxc7izBk=; b=IIgQs091Yf8tpZMAoQ7LPWoT2e/M9luYXkbxTFtoWQdB5TNHQr+QWNIaCseEoTKf8I vyo8fecuxnOs+iuRr2Oxl3gnPxZchnJS3RBC+POcV+h4wherLTN/3fL6UZ93ZTIs/Nhc Td2D1HeGH+KeYdX8gVbPXvH/ExZw/axbRA1PpAQo8mroG5M0hPAWybjHIWV4tGW+O7YR l3kvRveNfBc2Pfbf/BGclHjsMg3UJZhdKUSeyzY0q6ZQKMelHPpa9lqsp6neBQG9hH/Y Q3bcqR2KTEPP8wpvU4wpCMHgFV0z/H09qArsez97HWhtwK9cxo12lKqx5UOd8tRdTopy 2XKA== X-Gm-Message-State: AElRT7E/btUqUkSebZNy/doBqZtE70jp8/5+6fsfRyiHiP/po+6TUSO6 /FKdC4Y6h2boBjDp9pUqUVWFlQ== X-Google-Smtp-Source: AG47ELt2v4Lyjt7TfNJ/lDd0ffB/RLYp1Qii6c/G8AsXwOLgxIVrA32mp9x+df/etxdRXI8uLN5LkA== X-Received: by 2002:a19:101a:: with SMTP id f26-v6mr816481lfi.42.1520953542877; Tue, 13 Mar 2018 08:05:42 -0700 (PDT) Received: from ?IPv6:2a02:270:2014:40:d5a2:a2ab:ab88:6ca3? ([2a02:270:2014:40:d5a2:a2ab:ab88:6ca3]) by smtp.gmail.com with ESMTPSA id t81-v6sm88779lff.58.2018.03.13.08.05.41 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 13 Mar 2018 08:05:42 -0700 (PDT) From: David Ros Message-Id: Content-Type: multipart/alternative; boundary="Apple-Mail=_864E9FCF-6CD6-4A34-B6E8-914ED287402E" Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Date: Tue, 13 Mar 2018 16:05:40 +0100 In-Reply-To: Cc: "tcpm-chairs@ietf.org" , tsvwg-chairs@ietf.org To: Michael Welzl References: X-Mailer: Apple Mail (2.3273) Archived-At: Subject: Re: [tcpm] Something's fishy here X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 15:05:47 -0000 --Apple-Mail=_864E9FCF-6CD6-4A34-B6E8-914ED287402E Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 I confirm I am getting these emails, and I=E2=80=99ve never been either = a tcpm chair or a tsvwg chair=E2=80=A6 David > On 13 Mar 2018, at 16:03, Michael Welzl wrote: >=20 > Hey all, >=20 > David Ros and I received the last emails. In response to my previous = one about Jana, I also received answers from Lars and Patrick. > I think that already makes four people who probably shouldn=E2=80=99t = get emails that are only sent to tcpm-chairs and tsvwg-chairs. >=20 > So=E2=80=A6 check this out. I=E2=80=99m sending this email as a test, = again *only* to tcpm-chairs@ietf.org and = tsvwg-chairs@ietf.org >=20 > If you=E2=80=99re not a chair of TCPM or TSVWG, something=E2=80=99s = bad. If, like me, you never even were one, something=E2=80=99s REALLY = bad. >=20 > Then, maybe someone could fix it=E2=80=A6 or have someone fix it? But = I guess one of the chairs of one of these groups perhaps - because these = seem to be the wrong =E2=80=9Cexploders=E2=80=9D to even contain people = like myself? >=20 > Cheers, > Michael >=20 > PS: Because this email apparently will go out to many random people, = I=E2=80=99ll use this chance for a commercial break: = http://www.skinsofa.com > At least one of the recipients is in Munich, only a short drive away = from Innsbruck where we=E2=80=99ll play a gig in Hard Rock Cafe on the = 20th of April. Just saying :-) >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm --Apple-Mail=_864E9FCF-6CD6-4A34-B6E8-914ED287402E Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
I confirm I am getting these emails, and = I=E2=80=99ve never been either a tcpm chair or a tsvwg = chair=E2=80=A6

David

On 13 Mar 2018, at 16:03, Michael Welzl = <michawe@ifi.uio.no> wrote:

Hey all,

David Ros and I received = the last emails. In response to my previous one about Jana, I also = received answers from Lars and Patrick.
I think that = already makes four people who probably shouldn=E2=80=99t get emails that = are only sent to tcpm-chairs and tsvwg-chairs.

So=E2=80=A6 check this out. I=E2=80=99m = sending this email as a test, again *only* to tcpm-chairs@ietf.org and tsvwg-chairs@ietf.org

If you=E2=80=99re not a chair of TCPM = or TSVWG, something=E2=80=99s bad. If, like me, you never even were one, = something=E2=80=99s REALLY bad.

Then, maybe someone could fix it=E2=80=A6= or have someone fix it?  But I guess one of the chairs of one of = these groups perhaps - because these seem to be the wrong = =E2=80=9Cexploders=E2=80=9D to even contain people like = myself?

Cheers,
Michael

PS:  Because this email apparently = will go out to many random people, I=E2=80=99ll use this chance for a = commercial break: http://www.skinsofa.com
At least one = of the recipients is in Munich, only a short drive away from Innsbruck = where we=E2=80=99ll play a gig in Hard Rock Cafe on the 20th of April. = Just saying  :-)

_____________________________________________= __
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm

= --Apple-Mail=_864E9FCF-6CD6-4A34-B6E8-914ED287402E-- From nobody Tue Mar 13 08:06:03 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1A570126D73 for ; Tue, 13 Mar 2018 08:06:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=sjero-net.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RK3bTSA_TOzj for ; Tue, 13 Mar 2018 08:05:55 -0700 (PDT) Received: from mail-qk0-x22d.google.com (mail-qk0-x22d.google.com [IPv6:2607:f8b0:400d:c09::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A3A68127369 for ; Tue, 13 Mar 2018 08:05:55 -0700 (PDT) Received: by mail-qk0-x22d.google.com with SMTP id z197so15685033qkb.6 for ; Tue, 13 Mar 2018 08:05:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sjero-net.20150623.gappssmtp.com; s=20150623; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to; bh=sG7DE4edvLlLloz2wCdzBifRilImtIkhUec3g9Hfi80=; b=L5HGT/9TyiEunzoLdex8XUJDItxthZ3lqUHNyz02LJe3ht1uPNssB/W0dtFXRCP7Ux 39mhFiWO2rubuUv80d3TIcr8MMdyaroHezEpx8wTY/klxa/cBxfQONQ8e1xMrhTKMMX8 +EwQCGdB9km+e6R7THaz9aKd9WCCq4AlKsNzOmc69kSCofy7hHtumupnXPoDndnVDxR2 gkW/rKoDWkUTw9DfIiqKAfCRG0tcqqBIWXkM/sYN97P0LbBo6BiixHxtPuFPZLrh3olV lilQBQX//nJtukdNdJX+uBp1ZTexTbuabnoTFZvwLevIfxyV5lCmxSlc9fqLtSClHfrK V4nA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to; bh=sG7DE4edvLlLloz2wCdzBifRilImtIkhUec3g9Hfi80=; b=NuVjFa9poSmKW5RZG/EWRnCR4F+na9TgOtkr0/WxL0A1FKYE1/Kzxxogi4WSePzXQK LbltM6cdMzfPAUHiEMC312D+HuZER+9cLk+8HXN42qXE7+wKWKibmziL9H/hBPYPX3hg PpjPpjMdt3VQWIccO3UMwzir48vYoz94Z+RG/QrLJH/a9zlfOCYMLJt9zWAgvapgJvCH bUzMHqXboxiR1+BSriRxJU+Uegbnw9ECyWYFsMq+aPhRuNpV7F/+rCsygJeL+uZNujdQ t/8josmFcaxSHaIvePt30kuJPVgrUBYXRPwEKuvkv898YASDXS7u8+UtfwYnEn305H+f nFSg== X-Gm-Message-State: AElRT7EB8SGVRjR0e+lyqiJlhUmHfOcLQz3avjenmToq4pMUi5hpuQ3l EylVrKYEi9yYNOBs50dSJhgznQ== X-Google-Smtp-Source: AG47ELutJ2RqdWyxbR9I599yqeANtv7d+5XnQGuKLYvX+GtjJjkHEb07P4R8o1/mYLdWjbf3Gh4urA== X-Received: by 10.55.198.14 with SMTP id b14mr1466350qkj.174.1520953554650; Tue, 13 Mar 2018 08:05:54 -0700 (PDT) Received: from ?IPv6:2601:192:417f:ffe5:d6be:d9ff:fe33:f1ef? ([2601:192:417f:ffe5:d6be:d9ff:fe33:f1ef]) by smtp.gmail.com with ESMTPSA id v20sm339043qtg.3.2018.03.13.08.05.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 13 Mar 2018 08:05:53 -0700 (PDT) To: Michael Welzl , "tcpm-chairs@ietf.org" , tsvwg-chairs@ietf.org References: From: Samuel Jero Message-ID: Date: Tue, 13 Mar 2018 11:05:43 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="cfeBEQHMeX2BgsNcF16es28VIXfYQZ0Y6" Archived-At: Subject: Re: [tcpm] Something's fishy here X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 15:06:02 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --cfeBEQHMeX2BgsNcF16es28VIXfYQZ0Y6 Content-Type: multipart/mixed; boundary="JbTd83CP77LwnJJtMrJy2vK6elaYxBHjn"; protected-headers="v1" From: Samuel Jero To: Michael Welzl , "tcpm-chairs@ietf.org" , tsvwg-chairs@ietf.org Message-ID: Subject: Re: [tcpm] Something's fishy here References: In-Reply-To: --JbTd83CP77LwnJJtMrJy2vK6elaYxBHjn Content-Type: multipart/alternative; boundary="------------671E8F4AE95D4F915FB16724" Content-Language: en-US This is a multi-part message in MIME format. --------------671E8F4AE95D4F915FB16724 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable All, This email chain is being sent to the whole tcpm list. The problem is this address "tcpm-chairs@ietf.org ". Clearly the text description doesn't match the list that's actually being sent to. --Samuel -- Samuel Jero Doctoral Student Computer Science Network and Distributed Systems Security Lab Purdue University / Northeastern University sjero@sjero.net http://sjero.net/ On 03/13/2018 11:03 AM, Michael Welzl wrote: > Hey all, > > David Ros and I received the last emails. In response to my previous > one about Jana, I also received answers from Lars and Patrick. > I think that already makes four people who probably shouldn=E2=80=99t g= et > emails that are only sent to tcpm-chairs and tsvwg-chairs. > > So=E2=80=A6 check this out. I=E2=80=99m sending this email as a test, a= gain *only* to > tcpm-chairs@ietf.org =C2=A0and > tsvwg-chairs@ietf.org > > If you=E2=80=99re not a chair of TCPM or TSVWG, something=E2=80=99s bad= =2E If, like me, > you never even were one, something=E2=80=99s REALLY bad. > > Then, maybe someone could fix it=E2=80=A6 or have someone fix it? =C2=A0= But I guess > one of the chairs of one of these groups perhaps - because these seem > to be the wrong =E2=80=9Cexploders=E2=80=9D to even contain people like= myself? > > Cheers, > Michael > > PS: =C2=A0Because this email apparently will go out to many random peop= le, > I=E2=80=99ll use this chance for a commercial break:=C2=A0http://www.sk= insofa.com > At least one of the recipients is in Munich, only a short drive away > from Innsbruck where we=E2=80=99ll play a gig in Hard Rock Cafe on the = 20th of > April. Just saying =C2=A0:-) > > > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm --------------671E8F4AE95D4F915FB16724 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable All,

This email chain is being sent to the whole tcpm list. The problem is this address "tcpm-chairs@ietf.org <tcpm@ietf.org>". Clearly the text description doesn't match the list that's actually being sent to.

--Samuel
 
--
Samuel Jero
Doctoral Student
Computer Science
Network and Distributed Systems Security Lab
Purdue University / Northeastern University
sje=
ro@sjero.net
http://sjer=
o.net/
On 03/13/2018 11:03 AM, Michael Welzl wrote:
Hey all,

David Ros and I received the last emails. In response to my previous one about Jana, I also received answers from Lars and Patrick.
I think that already makes four people who probably shouldn=E2=80=99t get emails that are only sent to tcpm-chairs and tsvwg-chairs.

So=E2=80=A6 check this out. I=E2=80=99m sending t= his email as a test, again *only* to tcpm-chairs@ietf.org=C2= =A0and tsvwg-chairs@ietf.org

If you=E2=80=99re not a chair of TCPM or TSVWG, something=E2=80=99s bad. If, like me, you never even were one, something=E2=80=99s REALLY bad.

Then, maybe someone could fix it=E2=80=A6 or have= someone fix it? =C2=A0But I guess one of the chairs of one of these gro= ups perhaps - because these seem to be the wrong =E2=80=9Cexploders= =E2=80=9D to even contain people like myself?

Cheers,
Michael

PS: =C2=A0Because this email apparently will go o= ut to many random people, I=E2=80=99ll use this chance for a commerci= al break:=C2=A0http://www.skinsofa.com
At least one of the recipients is in Munich, only= a short drive away from Innsbruck where we=E2=80=99ll play a gi= g in Hard Rock Cafe on the 20th of April. Just saying =C2=A0:-) 



_______________________________________________
tcpm mailing list
tcpm@=
ietf.org
https://www.ietf.org/mailman/listinfo/tcpm

--------------671E8F4AE95D4F915FB16724-- --JbTd83CP77LwnJJtMrJy2vK6elaYxBHjn-- --cfeBEQHMeX2BgsNcF16es28VIXfYQZ0Y6 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEERzfnDUHx+VipdLow9Suo7XD6QhwFAlqn6MsACgkQ9Suo7XD6 QhzhMg//TtAEDgz2tHDcAqQnfPcq8f0n7c9YA053xUYtqLDotugBoQZxNmg76d1K o7OXoUP/E5dXKc89tBcKcJ/RaBQ1gybvRjWnzki5yUPeXB1ID6nAfz7Ou9+ZsOHC C79igIlL6fbOjbg8vyihMlIY01TVDikA65vrAriRxrUAQHeE0fhfpfW6gccpzo3Z 1Yn8LDzoKewEafBknmIHXR9UMTsGzE+BnQA6s2iMWKyX/EWi0os/0O03f8y2BQMz jYVs14q+pGExe0B36INnc/qBVXln5qIFQei5yointkZz6C4WcPTxWtNAwHfx+PUf peumioYyAbcvnFzZU5SZPvw+Uq6yu8OQUBCZcFzLUsoN3Rgu/PbMUS0IGaDesRBR Z7EoO+/saxbOXMcILpKT6F0nq/j/MXy6nnu6h8TkO7nThW0hsJMFfNBYZJCqzNvY Ii7RsX4YS3P/0vuReI8n8WVKiNYHs254/bPJrneVRunhChJohfkunCCoB9L9cc1D +/3jKUlHtldJG4lM0dZv2BlxYIockOXhPGoe71Jintq/s16/CGA+7BSlHHTzUJnB eXM5eCdG094Fc8CEQB5GT9/u/Mpya/ZhJTPKvE0D1osRzq9eLnDz0KvyvIiISTaK tv1gReBvSL5LIQFSYqJpt6FDLkK+x5Xr/UM2/8nS8z9tO+iXYwM= =pITC -----END PGP SIGNATURE----- --cfeBEQHMeX2BgsNcF16es28VIXfYQZ0Y6-- From nobody Tue Mar 13 08:07:31 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EF35B126C22; Tue, 13 Mar 2018 08:07:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.209 X-Spam-Level: X-Spam-Status: No, score=-4.209 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mhkbOaHH98qJ; Tue, 13 Mar 2018 08:07:26 -0700 (PDT) Received: from mail-out01.uio.no (mail-out01.uio.no [IPv6:2001:700:100:10::50]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9855B124B0A; Tue, 13 Mar 2018 08:07:26 -0700 (PDT) Received: from mail-mx04.uio.no ([129.240.10.25]) by mail-out01.uio.no with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1evlWO-0006NR-HB; Tue, 13 Mar 2018 16:07:24 +0100 Received: from [160.80.82.29] by mail-mx04.uio.no with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) user michawe (Exim 4.90_1) (envelope-from ) id 1evlWN-0002uo-9K; Tue, 13 Mar 2018 16:07:24 +0100 From: Michael Welzl Message-Id: <08AE06EB-3EA0-4292-96E1-6DCB2B78C1A2@ifi.uio.no> Content-Type: multipart/alternative; boundary="Apple-Mail=_3116D324-7903-4947-9163-324361858975" Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Date: Tue, 13 Mar 2018 16:07:25 +0100 In-Reply-To: Cc: "tcpm-chairs@ietf.org" , tsvwg-chairs@ietf.org To: Samuel Jero References: X-Mailer: Apple Mail (2.3273) X-UiO-SPF-Received: Received-SPF: neutral (mail-mx04.uio.no: 160.80.82.29 is neither permitted nor denied by domain of ifi.uio.no) client-ip=160.80.82.29; envelope-from=michawe@ifi.uio.no; helo=[160.80.82.29]; X-UiO-Spam-info: not spam, SpamAssassin (score=-5.0, required=5.0, autolearn=disabled, AWL=0.042, HTML_MESSAGE=0.001, UIO_MAIL_IS_INTERNAL=-5, uiobl=NO, uiouri=NO) X-UiO-Scanned: 2CF1CC46D6BD38A09ADC86CE73E90C03F494E76A Archived-At: Subject: Re: [tcpm] Something's fishy here X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 15:07:30 -0000 --Apple-Mail=_3116D324-7903-4947-9163-324361858975 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Yes - I just saw this now - somebody=E2=80=99s got the alias wrong in = their mail clients The first email I can see having this is from Michael Scharf=E2=80=A6 > On Mar 13, 2018, at 4:05 PM, Samuel Jero wrote: >=20 > All, >=20 > This email chain is being sent to the whole tcpm list. The problem is = this address "tcpm-chairs@ietf.org = ". Clearly the text description = doesn't match the list that's actually being sent to. >=20 > --Samuel > -- > Samuel Jero > Doctoral Student > Computer Science > Network and Distributed Systems Security Lab > Purdue University / Northeastern University > sjero@sjero.net > http://sjero.net/ > On 03/13/2018 11:03 AM, Michael Welzl wrote: >> Hey all, >>=20 >> David Ros and I received the last emails. In response to my previous = one about Jana, I also received answers from Lars and Patrick. >> I think that already makes four people who probably shouldn=E2=80=99t = get emails that are only sent to tcpm-chairs and tsvwg-chairs. >>=20 >> So=E2=80=A6 check this out. I=E2=80=99m sending this email as a test, = again *only* to tcpm-chairs@ietf.org and = tsvwg-chairs@ietf.org >>=20 >> If you=E2=80=99re not a chair of TCPM or TSVWG, something=E2=80=99s = bad. If, like me, you never even were one, something=E2=80=99s REALLY = bad. >>=20 >> Then, maybe someone could fix it=E2=80=A6 or have someone fix it? = But I guess one of the chairs of one of these groups perhaps - because = these seem to be the wrong =E2=80=9Cexploders=E2=80=9D to even contain = people like myself? >>=20 >> Cheers, >> Michael >>=20 >> PS: Because this email apparently will go out to many random people, = I=E2=80=99ll use this chance for a commercial break: = http://www.skinsofa.com >> At least one of the recipients is in Munich, only a short drive away = from Innsbruck where we=E2=80=99ll play a gig in Hard Rock Cafe on the = 20th of April. Just saying :-) >>=20 >>=20 >>=20 >> _______________________________________________ >> tcpm mailing list >> tcpm@ietf.org >> https://www.ietf.org/mailman/listinfo/tcpm = >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm --Apple-Mail=_3116D324-7903-4947-9163-324361858975 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Yes - I just saw this now - somebody=E2=80=99s got the alias = wrong in their mail clients
The first email I can see = having this is from Michael Scharf=E2=80=A6



On = Mar 13, 2018, at 4:05 PM, Samuel Jero <sjero@sjero.net> = wrote:

=20 =20
All,

This email chain is being sent to the whole tcpm list. The problem is this address "tcpm-chairs@ietf.org <tcpm@ietf.org>". Clearly the text description doesn't match the list that's actually being sent to.

--Samuel
 
--
Samuel Jero
Doctoral Student
Computer Science
Network and Distributed Systems Security Lab
Purdue University / Northeastern University
sjero@sjero.net
http://sjero.net/
On 03/13/2018 11:03 AM, Michael Welzl wrote:
Hey all,

David Ros and I received the last emails. In response to my previous one about Jana, I also received answers from Lars and Patrick.
I think that already makes four people who probably shouldn=E2=80=99t get emails that are only sent to tcpm-chairs and tsvwg-chairs.

So=E2=80=A6 check this out. I=E2=80=99m sending = this email as a test, again *only* to tcpm-chairs@ietf.org and tsvwg-chairs@ietf.org

If you=E2=80=99re not a chair of TCPM or TSVWG, something=E2=80=99s bad. If, like me, you never even were one, something=E2=80=99s REALLY bad.

Then, maybe someone could fix it=E2=80=A6 or = have someone fix it?  But I guess one of the chairs of one of these = groups perhaps - because these seem to be the wrong =E2=80=9Cexploders=E2= =80=9D to even contain people like myself?

Cheers,
Michael

PS:  Because this email apparently will go = out to many random people, I=E2=80=99ll use this chance for a = commercial break: http://www.skinsofa.com
At least one of the recipients is in Munich, = only a short drive away from Innsbruck where we=E2=80=99ll play a = gig in Hard Rock Cafe on the 20th of April. Just saying =  :-)



_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/m=
ailman/listinfo/tcpm

_______________________________________________
tcpm = mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm

= --Apple-Mail=_3116D324-7903-4947-9163-324361858975-- From nobody Tue Mar 13 08:08:35 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B8E4B124B0A; Tue, 13 Mar 2018 08:08:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.909 X-Spam-Level: X-Spam-Status: No, score=-1.909 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3TyxAcU-uayz; Tue, 13 Mar 2018 08:08:31 -0700 (PDT) Received: from mx2.cnes.fr (mx2.cnes.fr [194.199.174.201]) by ietfa.amsl.com (Postfix) with ESMTP id 927EE120724; Tue, 13 Mar 2018 08:08:30 -0700 (PDT) X-IronPort-AV: E=Sophos; i="5.47,465,1515456000"; d="scan'208,217"; a="17163760" X-IPAS-Result: A2G1AQD46Kda/wYBeApdGQEBAQEBAQEBAQEBAQcBAQEBAYJadlUQcCgKg0aaFYEWjxCFNYF6ByIBCoUCAhqDBiE3FQECAQEBAQEBAgNoJ4UkAQEBAQMBASEKKBkLEAIBBQMHBgEUHQMCAgIlCxQRAgQBDQUIhCxkD6tJgiYhiD+CCoU1hWqDLoMuAQGBPgESASE0CIJKMIIyBJpWCXuQVogyhUKSdjQjYXEzGidLgkMJhD5AN40BgSIBgRcBAQE From: Kuhn Nicolas To: David Ros , Michael Welzl CC: "tcpm-chairs@ietf.org" , "tsvwg-chairs@ietf.org" Thread-Topic: [tcpm] Something's fishy here Thread-Index: AQHTutyFVB1zdsnT40i+rSzQvyQ2+KPOMwMAgAAQ8xA= Date: Tue, 13 Mar 2018 15:08:10 +0000 Deferred-Delivery: Tue, 13 Mar 2018 15:07:37 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-tm-as-product-ver: SMEX-11.0.0.4255-8.100.1062-23718.000 x-tm-as-result: No--29.435400-8.000000-31 x-tm-as-user-approved-sender: No x-tm-as-user-blocked-sender: No Content-Type: multipart/alternative; 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mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HS8YHHblU566 for ; Tue, 13 Mar 2018 09:49:12 -0700 (PDT) Received: from pegasus.erg.abdn.ac.uk (pegasus.erg.abdn.ac.uk [IPv6:2001:630:241:204::f0f0]) by ietfa.amsl.com (Postfix) with ESMTP id 7DFD7124D37 for ; Tue, 13 Mar 2018 09:49:12 -0700 (PDT) Received: from dhcp-207-156.erg.abdn.ac.uk (unknown [IPv6:2001:630:241:207:1864:e7b7:87f2:69c]) by pegasus.erg.abdn.ac.uk (Postfix) with ESMTPSA id B2FA51B001AA; Tue, 13 Mar 2018 16:49:11 +0000 (GMT) Reply-To: gorry@erg.abdn.ac.uk To: =?UTF-8?Q?Mirja_K=c3=bchlewind?= Cc: tcpm@ietf.org References: <5A128116.9080609@erg.abdn.ac.uk> <0C9DF549-632F-4FAC-A561-3C3679552C6E@tik.ee.ethz.ch> From: Gorry Fairhurst Organization: The University of Aberdeen is a charity registered in Scotland, No SC013683. Message-ID: Date: Tue, 13 Mar 2018 16:49:10 +0000 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <0C9DF549-632F-4FAC-A561-3C3679552C6E@tik.ee.ethz.ch> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [tcpm] Detailed review of AccECN rev -04 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 16:49:16 -0000 I'd like to pick up on your replies. Please see inline. Gorry On 05/03/2018 14:09, Mirja Kühlewind wrote: > Hi Gorry, > > say for your feedback. Please see below. > >> Am 20.11.2017 um 08:15 schrieb Gorry Fairhurst : >> >> tcpm@ietf.org >> >> I've read the -04 rev of teh above ID, and I have the following comments for the TCPM WG. >> >> Overall, >> >> * This document reads well, and seems mature. >> >> * There are several references to other IETF activities, and the text concerning these appears to need to be revised before this is ready to proceed. See below. >> >> * Since this document was adopted, work on ECN++ appears to have become inter-twined with this ID. I did not find this helpful, and made comments on ECN++ today that voiced this concern and requested we consider as a WG to best frame the proposed modification on the TCP SYN permitting ECT(?) to be set. See comment (6). >> >> * I wonder if this document updates any other RFCs - I'd assume not - but it may if a future work proceeds along the standards track. I think it would be good to specifically identify in one section of the intro what these implications are. >> For instance: >> - The discussion of ECN on SYN is predecated by ECN-Experimentation (targeting publication as PS) >> - The discussion of ECN on SYN has implications on ECN++, which recommends AccECN is implemented. > > This document does NOT enable ECN on SYN. However, it does specify how to provide feedback on what was observed in the SYN (also because middleboxes might remark wrongly). These are two independent things. > >> - A future standards-track document based on the AccECN experimental RFC could update RFC3168. > > No, I don’t it would update RFC3168. It does not change anything in that RFC. It also specified an additional meachismen (which we hope will deploy as the default). The only thing we change is the use of the NS bit in the SYN but that was previously unused; with or without ECN Nonce. > OK that makes sense. > >> - etc. > > I don’t think there is any update. I thin we’ve been trying to be careful about that. > >> >> * The document may intend a proposed change to RFC 5681 (4.2. Generating Acknowledgments). See comment (8). > > I also don’t think so because RFC5681 says "The delayed ACK algorithm specified in [RFC1122] SHOULD be used by a TCP receiver.“ and not MUST. And delay ACK SHOULD still because but there are further things to consider. > > >> >> Gorry >> >> --- >> >> Some more specific comments on the text in the -04 AccECN draft: >> >> (1) The introduction - "until the AccECN experiment suceeds, [RFC3168] will remain as the standards track specification for adding ECN to TCP." >> - This seems odd. I think this is not the case: >> Quite simply: "RFC3168 defines the current TCP feedback method." >> - It may be you think a future standards-track document based on the AccECN experimental RFC could update RFC3168, that is possible, but there is no need for an EXP to make that direct claim against as PS. > > I added any „only“ here based on Micheal’s comment: > > "Until the AccECN experiment succeeds, [RFC3168] will > remain as the only standards track specification for adding ECN to TCP.“ > > This sentenced was just mention to introduce the term „classic ECN“. It was not meant to say anything about a status change of RFC3168, which we also do plan to do as explained to Micheal. AccECN is implicitly backward compatible to ECN therefore even AccECN as PS will not change, nor update anything that is said in RFC3168. > OK - so I think this actually should say the "only standards track method for providing ECN feedback" ... or something similar. >> >> (2) Section 1.5. First para. (On loss v drop using ECN) >> - I'd feel happier also noting that a router implementing AQM is still allowed to drop packets marked as ECT() when this is needed - and you could refer to the BCP to say so: /RFC/7567. > > I didn’t think the section say anything else. Also this is just the ECN recap… > > This says: > > "When a network node experiences congestion, it > will occasionally either drop or mark a packet, with the choice > depending on the packet's ECN codepoint. If the codepoint is Not- > ECT, only drop is appropriate. If the codepoint is ECT(0) or ECT(1), > the node can mark the packet by setting both ECN bits,…“ > > So it explicitly say „mark or drop“ and „can mark“... > > >> >> (3) Section 1.5. Last para. >> - Please remove the discussion of Nonce from here! > > I think it is still important to mention that this bit is not assigned completely newish but has been assigned for ECN purported previously. Based on Micheal’s comment I added a reference to the ecn-exp draft and explicitly say that NS has been marked as „revered“. > >> - It is OK simply to refer to the PS specifying ECN Experimentation - or the process document to do this. >> - If it is really necessary to discuss this, please use the form of words expressed in that draft, rather than saying "was never deployed“. > > Done. Now it says > "In the absence of widespread deployment RFC 3540 has been reclassified as historic [RFC8311]." > OK >> >> (4) Section 3.1.1 >> "is being reclassified as historic." >> - Again this text is now out-of-date, see comment (3). > > s/is being/has been/ OK >> >> (5) Section 3.1.1, ECN Nonce. >> - This definition also contains text later that say "does not need...". It's not that it doesn't need, more that the IETF has changed the use of this field. I think it would be easy to simply remove this definition - but the WG wants to keep it please align the text precisely with the ECN Experimentation draft. The last para of section 4 repeats this and has the smae problem. > > Good catch. Changed to > > "With AccECN implementation, there is no need to for the ECN Nonce feedback mode [RFC3540], which has also been reclassified as historic [RFC8311], as AccECN is compatible with an alternative ECN feedback integrity approach…" > > Does that work for you? > It would, with changing /as/ to /because/ >> >> (6) Section 3.1.2. ECN on SYN >> - This section seems to be a variant of the section expressed in the ECN++ draft (sect 4.2). That draft rather awkwardly refers back to this draft recommending AccECN is implemented - but the two specs differ. > > Section 3.1.2? Not sure what you mean… > > However, we have been to only specify a feedback scheme (that includes SYN feedback) and not say anything about when or if to use ECN (in general not only for the SYN). Please let me know if that is anywhere not the case. My feeling was that the two specs differ for how ECN is used with SYN. If that's not the case (as you say), it would be good to hear from the ECN++ people that they agree with the spec as written here - so we know that they are not going to be surprised when people refer back to this during the WGLC of their draft. >> >> I do encourage the WG to think about where the update on ECN for SYN is best described. > > As I just said we clearly want to separate feedback and usage of ECN as this is also one of the problems with RFC3168. > Separation is good. It would help to state (in section 3.1??) that this does not specify setting of the IP ECN field, only how feedback is negotiated. >> There are specific issues for experimentation and for caching in ECN++ and other issues here. I'd like a cleaner spec so that **IF** there are results from the experiments we know how to then publish a PS and declare the experiment as historic. At the moment this seems awkard. > > I think the nice part of this separation is actually that AccECN is independent of the results of the ECN++ experiments. See above. >> >> - Section 3.2.7.2 is also about the SYN negotiation. And similar to ECN++. > > I don’t know where the ECN+ doc says anything about negotiation. negoation and option fallback belongs in this doc. Setting and testing of the IP ECN codepoint below in ECN++. > >> >> (7) Section 3.2.3 (First segment after SYN) >> - TCP segments can be re-ordered, so saying the "first segment after SYN" should (I think) probably be the segment numbered after the SYN segment - noting that this is not necessarily the next segment received (in time order). > > I don’t see where this is written. Actually the text says: > > "More precisely, the "first segment with > SYN=0" is defined as: the segment with SYN=0 that i) acknowledges > sequence space at least covering the initial sequence number (ISN) > plus 1; and ii) arrives before any other segments with SYN=0 so it is > unlikely to be a retransmission.“ > OK - somehow I didn't focus on that as I read, so that seems fine. > >> >> (8) Section 3.2.5 >> - The modified delayed ACK policy stated here is an experimental update to the IETF recommended procedure in a PS (RFC5681, 4.2. Generating Acknowledgments). I think it is important that the change is referenced back to this RFC. The proposed change could have implications on the capacity used for the ACK stream - and this should be noted. > > I disagree as explained above. > >> >> (9) RFC2119: Section 3.2.7.1, para 1 >> - The ID says the client MUST NOT include the AccECN option on the SYN. What does a server do that receives such an option? > > I guess as long as the option is correct, there is no problem and therefore no further specification is needed; it would be treated like every other AccECN option. Not sure if that needs to be explicitly mentioned... >> >> (10) RFC2119: Section 3.2.7.1, para 2 >> - "A TCP server that confirms its support ... SHOULD also" >> - I couldn't parse that sentence... Is that to imply there are valid reasons why the server could be implemented in a way that does not do this? (That doesn't seem to be explained). > > Yes, it's the endpoints decision to use options at all. If it does not want to support feedback in options it should not send it in the SYN/ACK. I just realized that this not stated anyway explicitly, so I added a sentence at the end of in section 3.2.6.: > > "The use of the AccECN option is optional for the Data Receiver. If the Data Receiver intents to use the AccECN option at any time during the rest of the connection it strongly recommended to also test its path traversal by including it in the SYN/ACK as specified in the next section. By default the use of the AccECN option is RECOMMENDED.“ > > >> - What is the meaning of "also" here. Does that mean the support is already confirmed in some other way? (I'm not sure also after SHOULD is a helpful construction of a clause). > > This referred to in addition to the information provided in the ACE field. But I just removed the „also". >> >> (11) RFC2119: Section 3.2.7.1, para 3 >> - I think the sentence starting "A TCP Client" also contains two SHOULD clauses without saying what are the conditions for not doing this. I think it is often wiser to start these sort of clauses by saying something like this order to avoid this: >> >> ... A host that receives an AccECN option SHOULD respond by returning the AccECN option in the first ACK at the end of the 3WHS. ... There are three cases when the host could decide not to … > > No this is not the intention here. Option travel may be independent in both direction and should be tested independently. >> >> When the TCP client returns the ECN option, it SHOULD also include an AccECN option on the first data segment it sends... This is to ensure that... >> >> (12) RFC2119: Please also avoid "MAY NOT" as a construct, since this can be mis-interpretted by different varients of English usage. > > What else would we say? This is the correctly RFC2119 language. > OLD: A host MAY NOT include an AccECN Option in any of these three cases if it has cached knowledge that the packet would be likely to be NEW: A host MAY decide to NOT include an AccECN Option in any of these three cases, when it has cached knowledge that the packet would be likely to be - To me that more clearly states it is permitted to not include. >> >> (13) Section 3.3 appears to make string normative requirements (MUST) on the operation of middleboxes. This may be the intention, but if so, I think it would be much wider to then make this evident in the section title and the document introduction. > > Yes, that is intended. I renamed the section to > > "Requirements for TCP Proxies, Offload Engines and other Middleboxes on AccECN Compliance“ > > Does that help? > Yes. >> >> (14) RFC2119: Section 3.3 appears to make mixed normative requirements (MUST attempt) on offload. I don't know what that means. I think this could be equivalent to "SHOULD" with an explanation of WHY this is so needed (which is sort of there). > > s/MUST attempt to/SHOULD/ > > Also added > > „… as these can be used by the Data Sender to infer further information about the path congestion level.“ > OK >> >> (15) Section 3.3 on offload. >> - If this is intended to change offload behaviour, I think it needs a separate section to say this, mentioned in the intro, otherewise people implementing offload will not see and read this. > > Not really. How offload works with AccECN is a question I often get. My current understanding is that everything likely would still work but be less effective (at least when there are high level of path congestion). I would expect that is AccECN gets widely deployed offloading could be further optimized but there doesn’t see to be an urgent need now. However, knowing if what I actually said is all true, might also be part of the experiment… > >> >> (16) Section 4, Section 5, Appendix A, intro. >> - You could remove (not normative) to be even clearer. > > I don’t really see a point in removing these parts. As there are non-normative this obviously says that the spec would still be complete without them, however, I think the still have some useful information and I don’t the what we gain by removing them…? >> OK >> (17) For the avoidance of doubt it may be wise to state the standards status of the TCP AO and Conex work... e.g., "TCP AO is a standards-track method to …" > > Where should we do that? > You could here: The TCP authentication option (TCP-AO [RFC5925]) is a standards track method that can be used to detect any tampering with AccECN > Mirja > > >> >> Best wishes, >> >> Gorry >> >> _______________________________________________ >> tcpm mailing list >> tcpm@ietf.org >> https://www.ietf.org/mailman/listinfo/tcpm > From nobody Tue Mar 13 09:49:44 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 562BE124D37; Tue, 13 Mar 2018 09:49:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.959 X-Spam-Level: X-Spam-Status: No, score=-3.959 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ir6wnE2XEzvx; Tue, 13 Mar 2018 09:49:39 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 644241275FD; Tue, 13 Mar 2018 09:49:33 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [131.188.34.77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 477FE58C50D; Tue, 13 Mar 2018 17:49:28 +0100 (CET) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 2DDE3B0DD00; Tue, 13 Mar 2018 17:49:28 +0100 (CET) Date: Tue, 13 Mar 2018 17:49:28 +0100 From: Toerless Eckert To: Gorry Fairhurst Cc: Katsushi Kobayashi , Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "Scharf, Michael (Nokia - DE/Stuttgart)" , "tsvwg-chairs@ietf.org" , Yingzhen Qu Message-ID: <20180313164928.GA17042@faui40p.informatik.uni-erlangen.de> References: <5A9BEB65.6010102@erg.abdn.ac.uk> <050065D2-5F2E-4E79-9BD1-E1DC03F13900@acm.org> <5AA79C2E.1040808@erg.abdn.ac.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5AA79C2E.1040808@erg.abdn.ac.uk> User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: Re: [tcpm] inband signaling (was: Re: [tsvwg] Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 16:49:42 -0000 Thanks, Gory, nice explanation TCP Quickstart is rfc4782 btw. i think there was a buggy number in the thread. TCP quickstart really relates IMHO primarily to draft-han-6man-in-band-signaling-for-transport-qos, but not to draft-han-tsvwg-cc. The latter one is really meant to modify TCP assuming a known guaranteed CIR - whatever mechanism is used to provide that guarantee. TCP quickstart is an interesting example for inband signaling, which is what Lin's in-band-signaling draft does too. The main difference is that our draft focusses on high-value traffic where per-flow state is feasible and beneficial, if not necessary. And TCP quickstart seems more targeted to ANY TCP flow. Which raises a complete different scalability challenge to TCP quickstart. This type of comparison discussion will go into draft updates on our side. Would be interested in any more data points about the history of TCP quickstart, eg: where it was observed in the wild in deployments. Cheers Toerless On Tue, Mar 13, 2018 at 09:38:54AM +0000, Gorry Fairhurst wrote: > Maybe I'm saying what is obvious, but to be sure: > > The way I see QS is: > - The router tracks the unutilised link capacity at the current > time, and uses this as some estimate of what may be available to new > flows in the near future. > - The router responds to QS requests and can accept them if there is > "unutilised capacity" remaining. > - When accepted router updates it's count of the total unutilised > capacity reducing by the accepted QS requests. (i.e., Subsequent QS > requests in the same interval will currently have a smaller pool of > unutilised capacity available). > - After the end of the interval all "QS requests" expire and the > router again makes a measure of the unutilised capacity at the > current time. > > None of this implies a "reservation" of link resource in my > thinking. In QS, the whole link capacity is intended to be shared > using congestion control, and if flows start to send more using > normal CC within the interval where QS is operating, they would > simply receive a larger share of the capacity. That is: QS request > didn't "allocate" any link resource. > > Gorry > > > On 13/03/2018, 06:58, Katsushi Kobayashi wrote: > >Hi, > > > >I think TCP QS router on the path also reserves bandwidth resource, > >if it accepts a request. > > > >RFC4782 says: > > If the router approves the Quick-Start Request, this approval SHOULD > > be taken into account in the router's decision to accept or reject > > subsequent Quick-Start Requests (e.g., using a variable that tracks > > the recent aggregate of accepted Quick-Start Requests). > > > > > >--- > >Katsushi Kobayashi > > > >>2018/03/13 ??????3:43???Yingzhen Qu >>> ????????????: > >> > >>Hi Michael, > >>Sorry for the late response. > >> > >>Thanks for pointing out that we missed this important reference. > >>You're right, Quick-Start and our proposal do have lots of > >>similarities, for example both of them require that end-points > >>and routers to work together. But they are also different in > >>details. For example, in our proposal in-band signaling proposal > >>bandwidth is reserved on routers along the path. > >> > >>In next version of this draft, We'll add discussions about RFC > >>4728 and 6077. > >> > >>BTW, can I request a slot to present this draft in TCPM if time allows? > >> > >>Thanks, > >>Yingzhen > >> > >>On Mon, Mar 5, 2018 at 12:09 AM, Scharf, Michael (Nokia - > >>DE/Stuttgart) >>> wrote: > >> > >> I believe that this proposal is similar to QuickStart TCP (RFC > >> 4782), which is not cited in draft-han-tsvwg-cc, and the > >> reference is also missing in > >> draft-han-6man-in-band-signaling-for-transport-qos. > >> > >> RFC 6077 explains some of the issues that an in-band signaling > >> mechanism like Quick-Start has to solve. As far as I can tell, > >> the fundamental challenge is neither the protocol specification > >> nor a prototype implementation. For instance, it has been proven > >> that QuickStart TCP can be implemented e.g. in network processors > >> (see > >> http://www.ikr.uni-stuttgart.de/Content/Publications/Archive/Sf_Diss_40112.pdf > >> ). > >> > >> So, when updating the documents, I suggest to add a discussion of > >> how the open research issues explained in RFC 6077 are addressed. > >> > >> Michael > >> > >> *From:* Yingzhen Qu [mailto:yingzhen.ietf@gmail.com > >> ] > >> *Sent:* Sunday, March 04, 2018 9:59 PM > >> *To:* gorry@erg.abdn.ac.uk > >> *Cc:* Scharf, Michael (Nokia - DE/Stuttgart) > >> >; > >> Thomas Nadeau >> >; tcpm@ietf.org > >> ; Yingzhen Qu >> >; tsvwg@ietf.org > >> ; tsvwg-chairs@ietf.org > >> > >> *Subject:* Re: [tsvwg] Agenda requests for TSVWG@IETF101 > >> > >> Hi Gorry and Michael, > >> > >> Thanks for the suggestion, I'll request a presentation in ICCRG. > >> Meanwhile, I think since the in-band signaling draft was > >> presented in TSVWG, if time allows it still makes sense to > >> present this draft in TSVWG. > >> > >> The in-band signaling draft covers lots of aspects, and the > >> required changes include network layer and transport layer. We're > >> working on updating the draft, and may break it into pieces to > >> fit different WGs. > >> > >> Your comments and help are very much appreciated. > >> > >> Thanks, > >> > >> Yingzhen > >> > >> On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst > >> > wrote: > >> > >> I am unsure yet what the correct group of people world be to > >> explore a "Bandwidth Guaranteed Network". The presentation > >> last IETF looked like the work could imply a need for changes > >> proposed to the network layer (using OAM exchnages) to set > >> the sending rate and make those bandwidth reservations. In > >> the end, it could result in a protocol quite different to > >> TCP, I think this sort of change may possibly have a home in > >> TSVWG - but first I'd agree with Michaeland would encourage > >> a presentation of the problem statement in ICCRG to explore > >> the issues. > >> > >> Gorry > >> > >> On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) > >> wrote: > >> > >> > >> Hi all, > >> > >> >From the abstract: ??????This draft proposes a new TCP > >> congestion control algorithm used in bandwidth guaranteed > >> networks. It is an extension to the current TCP standards.??? > >> > >> In the IETF, I believe the expertise for this specific > >> document would be in TCPM, which in CC. If the authors > >> are interested in feedback on the proposed mechanism, I > >> would recommend to ask TCPM. > >> > >> Alternatively, corresponding research could perhaps be > >> performed in the ICCRG. ICCRG has published RFC 6077 to > >> document some of the open research issues in this space. > >> > >> Michael > >> > >> *From:*tsvwg [mailto:tsvwg-bounces@ietf.org > >> ] *On Behalf Of *Yingzhen Qu > >> *Sent:* Sunday, March 04, 2018 6:55 AM > >> *To:* tsvwg@ietf.org ; > >> tsvwg-chairs@ietf.org > >> *Cc:* Thomas Nadeau >> > > >> *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 > >> > >> Dear Chairs, > >> > >> A new draft (The draft was suggested by TSVWG @IETF100) > >> was just submitted, and we???d like to request a time slot > >> to present it @IETF101. > >> > >> Title:A New Congestion Control in Bandwidth Guaranteed > >> Network > >> > >> Presenter: Yingzhen Qu (Huawei) > >> > >> Time required (including Q/A): 10 mins > >> > >> Draft: > >> https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ > >> > >> > >> If there is any question, please kindly let us know. > >> > >> Thanks, > >> > >> Yingzhen > >> > >> > > -- --- tte@cs.fau.de From nobody Tue Mar 13 10:25:43 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0BE151200E5; Tue, 13 Mar 2018 10:25:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.21 X-Spam-Level: X-Spam-Status: No, score=-4.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XAHd1KwpZA_t; Tue, 13 Mar 2018 10:25:40 -0700 (PDT) Received: from mail-out02.uio.no (mail-out02.uio.no [IPv6:2001:700:100:8210::71]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E70D0127978; Tue, 13 Mar 2018 10:25:38 -0700 (PDT) Received: from mail-mx06.uio.no ([129.240.10.40]) by mail-out02.uio.no with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1evng7-000Gcb-No; Tue, 13 Mar 2018 18:25:35 +0100 Received: from [160.80.82.29] by mail-mx06.uio.no with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) user michawe (Exim 4.90_1) (envelope-from ) id 1evng6-0007Ba-O1; Tue, 13 Mar 2018 18:25:35 +0100 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) From: Michael Welzl X-Priority: 3 In-Reply-To: <23187136694049B3BEA2C7FAD794E280@srichardlxp2> Date: Tue, 13 Mar 2018 18:25:34 +0100 Cc: Michael Tuexen , tcpm@ietf.org, tcpm-chairs@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> <23187136694049B3BEA2C7FAD794E280@srichardlxp2> To: Richard Scheffenegger X-Mailer: Apple Mail (2.3273) X-UiO-SPF-Received: Received-SPF: neutral (mail-mx06.uio.no: 160.80.82.29 is neither permitted nor denied by domain of ifi.uio.no) client-ip=160.80.82.29; envelope-from=michawe@ifi.uio.no; helo=[160.80.82.29]; X-UiO-Spam-info: not spam, SpamAssassin (score=-5.0, required=5.0, autolearn=disabled, UIO_MAIL_IS_INTERNAL=-5, uiobl=NO, uiouri=NO) X-UiO-Scanned: 7067E24347C83684036CB07E5C3B28C5123B6862 Archived-At: Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 17:25:42 -0000 Hi, > On Mar 1, 2018, at 11:13 AM, Richard Scheffenegger = wrote: >=20 > Hi, >=20 > Some of the I-D references are already RFCs; >=20 > Reading the FreeBSD modular cubic code, using a beta value of 0.8 (vs. = 0.7 reportedy in Linux), I'm wondering if some generic rules-of-thumb, = as to what a reasonable beta_loss vs. beta_ecn adjustment would be in = this RFC might be in order (although I agree, that CCs should come up = with reasonable guidance there). Yes, we found the choice of value to depend on the algorithm. > Other than this, I like this draft, as it also gives some additional = incouragement to deploy ECN. Thanks - we hope so too! Cheers, Michael PS: When I just tried to answer this email with reply-to-all, my Apple = Mail client offered the alias: "tcpm-chairs@ietf.org" =20 which it had stored as an address, as a result of the previous = conversation. To avoid continuing the nonsense of wrongly sending to the = list instead of the chairs in the future as this alias gets stored in = email clients, I recommend that folks check this address carefully when = sending replies. Although, maybe don=E2=80=99t: it would be kind of funny to see these = things happen more often :-) this certainly gave me a good laugh = today. From nobody Tue Mar 13 12:25:35 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C406312D7E5; Tue, 13 Mar 2018 12:25:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PdO_GVjd4xdQ; Tue, 13 Mar 2018 12:25:30 -0700 (PDT) Received: from mail-yw0-x233.google.com (mail-yw0-x233.google.com [IPv6:2607:f8b0:4002:c05::233]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C2D2012D7F4; Tue, 13 Mar 2018 12:25:29 -0700 (PDT) Received: by mail-yw0-x233.google.com with SMTP id y64so549892ywa.3; Tue, 13 Mar 2018 12:25:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=HVY8XN4hLBcLLHIKYwTMc9JCC2bJBSAnBgOcrggDQck=; b=szBsgpntyJlzSZaoWmOR1NTS+OdIQqsHbxUEj1UwTOZcHZ0FbTnNaHmKAGqo8ztxbx xhDSxgjcbKmJ5GsLMwiRtkYnufdvA9nxiT2doRj0w1Peme7M1IcDxUtYAk1LivoF7z2Y xH6KQYjWW0WzpSJuCBIlu2/bWI7MfvEAX4MoGo/T0qGRGgkOx+JXBZhNAy0VTg/R90Rc ORWpkjR1KrFMRU1bmTdOFHwau4imx8AeW+L1er3qwhVaY7Hxkygq5cOOFZ4uTxI8bWoB DFysJLkhhG0qiwivj5BHpRK/x35hHtwqd7zRXDIrCvHpavZ4MTBmirfIeRQ0bxngxZCA yoBA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=HVY8XN4hLBcLLHIKYwTMc9JCC2bJBSAnBgOcrggDQck=; b=N73IDLqqT3+A0fIft/z1MflSzqDlWf6+b07w5NJhqgs+kjnjdGg1Hbp5az4bLeHwpB 7jvq37haUbEDukbHHg8mCLnhBW7ViE1PQIZ//WePpMg16nzQDA35/mJA7QNpXit9AOHL bim7B0ZWLsvAVXxDZnKNgKSdfKAmY9wVofg/I9wovpLxR6I+HIcNPNv9EViy8ShVIXzk x0vPrzkKc4IDUyIwMKcaVNe4SYWkwG6cTkx7GHYgw5SZvwh9aFzsV6XNx9R3iAA/7qLv eBIWxn05Apow9B5yIuC+lEBuql4qqPvJFpUQcynQskfvuZlfLVp9bBu2LkpYriN8uM02 uKcg== X-Gm-Message-State: AElRT7Hn4XavdgCm7caoq3hxyxO0HY8ZWuJ283IJXR4Uji7G3m+LiTgh YCYyZqS9yhDHaVwgsOHONRG9db7RfZY65T0zmI1M7w== X-Google-Smtp-Source: AG47ELv6ge+hu3e8p3jdIRbZnz7B1sYPb7KRo+ESqPsBY3SI2GrE3+FhCvVAy6m22A5mnNzjebhOAXMN7jETmDTv/Bg= X-Received: by 2002:a25:1a42:: with SMTP id a63-v6mr1467720yba.235.1520969128504; Tue, 13 Mar 2018 12:25:28 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a25:5f06:0:0:0:0:0 with HTTP; Tue, 13 Mar 2018 12:25:28 -0700 (PDT) In-Reply-To: <5AA7BB41.4070507@erg.abdn.ac.uk> References: <5A9BEB65.6010102@erg.abdn.ac.uk> <430A7C48-DA1D-4D73-AB40-F2B30A8E8580@lurchi.franken.de> <5AA7A614.3050706@erg.abdn.ac.uk> <5AA7BB41.4070507@erg.abdn.ac.uk> From: Spencer Dawkins at IETF Date: Tue, 13 Mar 2018 14:25:28 -0500 Message-ID: To: G Fairhurst Cc: "Scharf, Michael (Nokia - DE/Stuttgart)" , "tcpm-chairs@ietf.org" , "tsvwg-chairs@ietf.org" Content-Type: multipart/alternative; boundary="0000000000009e728b056750387c" Archived-At: Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 19:25:34 -0000 --0000000000009e728b056750387c Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Just to confirm, On Tue, Mar 13, 2018 at 6:51 AM, Gorry Fairhurst wrote: > On 13/03/2018, 11:23, Scharf, Michael (Nokia - DE/Stuttgart) wrote: > >> As for TSVWG, we have had quite a long discussion with the authors at th= e >>> meeting and after. The TSV chairs encouraged them to take the CC aspect= s >>> separately and explain why this method is better and detail what this >>> benefit >>> is and what is required in the router to allow this. We suggested an >>> initial talk >>> in ICCRG to present results and show *why* this is attractive. As far a= s >>> I know >>> they requested time to do this. >>> >> ICCRG is the right home for this. And the TCPM charter explicitly allows >> us to move topics there... >> >> I have written a PhD thesis on exactly this topic; we had a network >> processor implementation of Quick-Start, and our use cases was actually >> augmented/virtual reality... And I run into tons of fundamental issues 1= 0 >> years ago, which are not easy to solve and not even mentioned in the I-D= s. >> So I somehow feel qualified to give feedback on what they have to look a= t >> more in detail =F0=9F=98=89 >> >> They also requested time in TSVWG - but there's (as yet) been little >>> discssion >>> on the list, so we curently advise them to prepare a slide to show to >>> say why >>> people should read the draft. We have not decided (yet) to give time to >>> this >>> new framework. >>> >> I personally believe that for new ideas the IETF should give a >> presentation slot *once*. For a second presentation the bar should be >> higher. If the framework draft has been presented already in TSVWG, IMHO >> further discussion on that belongs now on the list. >> >> They have now also requested time in TCPM. >>> >> The draft is very specific about TCP congestion control, so in principle >> it belongs into TCPM. In general, I think TCPM should be open to new ide= as. >> But my own thinking is that this can be at best a "if time permits" >> presentation in TCPM. >> >> I don't know whethere this time they are also requesting slots some othe= r >>> places to discuss other aspects. >>> >>> I also suggested (informally) that they should try making a great short >>> presentation of how this is a new opportunity and whar has changed sinc= e >>> we last saw schemes proposed. I do see that there are significant >>> advances in >>> router forwarding hardware - and I suspect there could be similar ideas >>> in >>> cisco, etc.Would other vendors (or operators) be interested in >>> standardising >>> this? I think such a talk could be put to TSVAREA. >>> >> I am only at the IETF on Sunday evening and Monday morning. >> Unfortunately, I may not be in TSVAREA as I have to go back to the airpo= rt. >> >> I doubt that other people who are familiar with RTG and OPS area will >> show up in TSVAREA (but I may be wrong). It is pointless to discuss traf= fic >> engineering and OAM in router hardware without RTG area input. In RTG an= d >> OPS area, the level of multi-vendor support of a document can typically = be >> seen in the author list. >> >> Michael >> >> I suspect it is far too late to use TSVAREA for this at the coming IETF. > https://datatracker.ietf.org/meeting/101/materials/agenda-101-tsvarea looks pretty packed to me - it's a one-hour slot. > Actually, to be more clear --- I am **NOT** against some sort of evolutio= n > in the network, and figuring out how best transports interact with this. > Ditto. Spencer > I still have people working on this, I see newer router designs as more > inviting, I still see appetite to do this. But like you, I **KNOW** there > some big obtsacles and pitfalls. I am wondering how best to bring this so= rt > of work to the IETF and get good perspective on the problems and solution= s. > After PLUS was short down by Privacy, I'd hate the next new thing to be > shot down for the wrong reason. > > Gorry > > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm > --0000000000009e728b056750387c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Just to confirm,=C2=A0

On Tue, Mar 13, 2018 at 6:51 AM, Gorry Fairhurst <gorry@erg.abdn.ac.uk> wrote:
O= n 13/03/2018, 11:23, Scharf, Michael (Nokia - DE/Stuttgart) wrote:
As for TSVWG, we have had quite a long discussion with the authors at the meeting and after. The TSV chairs encouraged them to take the CC aspects separately and explain why this method is better and detail what this benef= it
is and what is required in the router to allow this. We suggested an initia= l talk
in ICCRG to present results and show *why* this is attractive. As far as I = know
they requested time to do this.
ICCRG is the right home for this. And the TCPM charter explicitly allows us= to move topics there...

I have written a PhD thesis on exactly this topic; we had a network process= or implementation of Quick-Start, and our use cases was actually augmented/= virtual reality... And I run into tons of fundamental issues 10 years ago, = which are not easy to solve and not even mentioned in the I-Ds. So I someho= w feel qualified to give feedback on what they have to look at more in deta= il =F0=9F=98=89

They also requested time in TSVWG - but there's (as yet) been little di= scssion
on the list, so we curently advise them to prepare a slide to show to say w= hy
people should read the draft. We have not decided (yet) to give time to thi= s
new framework.
I personally believe that for new ideas the IETF should give a presentation= slot *once*. For a second presentation the bar should be higher. If the fr= amework draft has been presented already in TSVWG, IMHO further discussion = on that belongs now on the list.

They have now also requested time in TCPM.
The draft is very specific about TCP congestion control, so in principle it= belongs into TCPM. In general, I think TCPM should be open to new ideas. B= ut my own thinking is that this can be at best a "if time permits"= ; presentation in TCPM.

I don't know whethere this time they are also requesting slots some oth= er
places to discuss other aspects.

I also suggested (informally) that they should try making a great short
presentation of how this is a new opportunity and whar has changed since we last saw schemes proposed. I do see that there are significant advances = in
router forwarding hardware - and I suspect there could be similar ideas in<= br> cisco, etc.Would other vendors (or operators) be interested in standardisin= g
this? I think such a talk could be put to TSVAREA.
I am only at the IETF on Sunday evening and Monday morning. Unfortunately, = I may not be in TSVAREA as I have to go back to the airport.

I doubt that other people who are familiar with RTG and OPS area will show = up in TSVAREA (but I may be wrong). It is pointless to discuss traffic engi= neering and OAM in router hardware without RTG area input. In RTG and OPS a= rea, the level of multi-vendor support of a document can typically be seen = in the author list.

Michael

I suspect it is far too late to use TSVAREA for this at the coming IETF.

https://datatracker.ietf.org/meeti= ng/101/materials/agenda-101-tsvarea looks pretty packed to me - it'= s a one-hour slot.=C2=A0
=C2=A0
Actually, to be more clear --- I am **NOT** against s= ome sort of evolution in the network, and figuring out how best transports = interact with this.

Ditto.=C2=A0
<= div>
Spencer
=C2=A0
I still have people working on this, I see newer ro= uter designs as more inviting, I still see appetite to do this. But like yo= u, I **KNOW** there some big obtsacles and pitfalls. I am wondering how bes= t to bring this sort of work to the IETF and get good perspective on the pr= oblems and solutions. After PLUS was short down by Privacy, I'd hate th= e next new thing to be shot down for the wrong reason.

Gorry


_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm

--0000000000009e728b056750387c-- From nobody Tue Mar 13 12:27:41 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1053E12D7E5; Tue, 13 Mar 2018 12:27:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.23 X-Spam-Level: X-Spam-Status: No, score=-4.23 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NLyB4yi8eHe7; Tue, 13 Mar 2018 12:27:31 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EFA96129C56; Tue, 13 Mar 2018 12:27:30 -0700 (PDT) Received: from lhreml701-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id AA20B674D50A2; Tue, 13 Mar 2018 19:27:26 +0000 (GMT) Received: from SJCEML702-CHM.china.huawei.com (10.208.112.38) by lhreml701-cah.china.huawei.com (10.201.108.42) with Microsoft SMTP Server (TLS) id 14.3.382.0; Tue, 13 Mar 2018 19:27:28 +0000 Received: from SJCEML521-MBS.china.huawei.com ([169.254.2.168]) by SJCEML702-CHM.china.huawei.com ([169.254.4.179]) with mapi id 14.03.0382.000; Tue, 13 Mar 2018 12:27:19 -0700 From: Lin Han To: Toerless Eckert , Gorry Fairhurst CC: Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "Scharf, Michael (Nokia - DE/Stuttgart)" , "tsvwg-chairs@ietf.org" , Katsushi Kobayashi , Yingzhen Qu Thread-Topic: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) Thread-Index: AQHTuwFM3r3WTfYLEkqWf3ecaDUj6g== Date: Tue, 13 Mar 2018 19:27:18 +0000 Message-ID: <1D30AF33624CDD4A99E8C395069A2A162CDB9BA3@sjceml521-mbs.china.huawei.com> References: <5A9BEB65.6010102@erg.abdn.ac.uk> <050065D2-5F2E-4E79-9BD1-E1DC03F13900@acm.org> <5AA79C2E.1040808@erg.abdn.ac.uk> <20180313164928.GA17042@faui40p.informatik.uni-erlangen.de> In-Reply-To: <20180313164928.GA17042@faui40p.informatik.uni-erlangen.de> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.209.217.85] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 19:27:34 -0000 Hi, Gorry/Toerless Here is some explanation and clarification for two drafts (draft-han-tsvwg-= cc and draft-han-6man-in-band-signaling-for-transport-qos) 1. About draft-han-tsvwg-cc compared with other CC for bandwidth guaranteed= network, such as gTFRC. draft-han-tsvwg-cc is a split draft from draft-han-6man-in-band-signaling-f= or-transport-qos . It proposes a new CC for a network if the TCP session's = bandwidth is guaranteed. Here the guaranteed bandwidth is per TCP session = and described by PIR/CIR and given directly by TCP end user.=20 2. About TCP-QS and draft-han-6man-in-band-signaling-for-transport-qos >From my understanding, TCP-QS and draft-han-6man-in-band-signaling-for-tran= sport-qos do have similarity, both are kind of using in-band signaling for = the resource reservation. But they still have big difference. 1). draft-han-6man-in-band-signaling-for-transport-qos is more general in-b= and signaling method, it not only applies to TCP, but also UDP or other upp= er layer of protocol, even the draft only exemplifies the method to TCP. 2). draft-han-6man-in-band-signaling-for-transport-qos provides reserved re= source for bandwidth and latency for the whole life of TCP session. It give= s more flavors and more granularity for the QoS (unlike TCP-QS only has 16 = values of starting bandwidth). Moreover, it can support the "worst case lat= ency" at each hop; also, it can support the OAM to detect the congestion st= ates, and support the "forwarding state" for host to be notified in real-ti= me about if the resource reservation or QoS forwarding is interrupted by ab= normal situation such as link/node failures. Best regards Lin -----Original Message----- From: tsvwg [mailto:tsvwg-bounces@ietf.org] On Behalf Of Toerless Eckert Sent: Tuesday, March 13, 2018 9:49 AM To: Gorry Fairhurst Cc: Thomas Nadeau ; tcpm@ietf.org; tsvwg@ietf.org;= Scharf, Michael (Nokia - DE/Stuttgart) ; tsvwg-c= hairs@ietf.org; Katsushi Kobayashi ; Yingzhen Qu Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101) Thanks, Gory, nice explanation TCP Quickstart is rfc4782 btw. i think there was a buggy number in the thre= ad. TCP quickstart really relates IMHO primarily to draft-han-6man-in-band-sign= aling-for-transport-qos, but not to draft-han-tsvwg-cc. The latter one is r= eally meant to modify TCP assuming a known guaranteed CIR - whatever mechan= ism is used to provide that guarantee. TCP quickstart is an interesting example for inband signaling, which is wha= t Lin's in-band-signaling draft does too. The main difference is that our d= raft focusses on high-value traffic where per-flow state is feasible and be= neficial, if not necessary. And TCP quickstart seems more targeted to ANY T= CP flow. Which raises a complete different scalability challenge to TCP qui= ckstart. This type of comparison discussion will go into draft updates on our side. Would be interested in any more data points about the history of TCP quicks= tart, eg: where it was observed in the wild in deployments. Cheers Toerless On Tue, Mar 13, 2018 at 09:38:54AM +0000, Gorry Fairhurst wrote: > Maybe I'm saying what is obvious, but to be sure: >=20 > The way I see QS is: > - The router tracks the unutilised link capacity at the current time,=20 > and uses this as some estimate of what may be available to new flows=20 > in the near future. > - The router responds to QS requests and can accept them if there is=20 > "unutilised capacity" remaining. > - When accepted router updates it's count of the total unutilised=20 > capacity reducing by the accepted QS requests. (i.e., Subsequent QS=20 > requests in the same interval will currently have a smaller pool of=20 > unutilised capacity available). > - After the end of the interval all "QS requests" expire and the=20 > router again makes a measure of the unutilised capacity at the current=20 > time. >=20 > None of this implies a "reservation" of link resource in my thinking.=20 > In QS, the whole link capacity is intended to be shared using=20 > congestion control, and if flows start to send more using normal CC=20 > within the interval where QS is operating, they would simply receive a=20 > larger share of the capacity. That is: QS request didn't "allocate"=20 > any link resource. >=20 > Gorry >=20 >=20 > On 13/03/2018, 06:58, Katsushi Kobayashi wrote: > >Hi, > > > >I think TCP QS router on the path also reserves bandwidth resource,=20 > >if it accepts a request. > > > >RFC4782 says: > > If the router approves the Quick-Start Request, this approval SHOULD > > be taken into account in the router's decision to accept or reject > > subsequent Quick-Start Requests (e.g., using a variable that tracks > > the recent aggregate of accepted Quick-Start Requests). > > > > > >--- > >Katsushi Kobayashi > > > >>2018/03/13 ??????3:43???Yingzhen Qu >>> ????????????: > >> > >>Hi Michael, > >>Sorry for the late response. > >> > >>Thanks for pointing out that we missed this important reference. > >>You're right, Quick-Start and our proposal do have lots of=20 > >>similarities, for example both of them require that end-points and=20 > >>routers to work together. But they are also different in details.=20 > >>For example, in our proposal in-band signaling proposal bandwidth is=20 > >>reserved on routers along the path. > >> > >>In next version of this draft, We'll add discussions about RFC > >>4728 and 6077. > >> > >>BTW, can I request a slot to present this draft in TCPM if time allows? > >> > >>Thanks, > >>Yingzhen > >> > >>On Mon, Mar 5, 2018 at 12:09 AM, Scharf, Michael (Nokia - > >>DE/Stuttgart) >>> wrote: > >> > >> I believe that this proposal is similar to QuickStart TCP (RFC > >> 4782), which is not cited in draft-han-tsvwg-cc, and the > >> reference is also missing in > >> draft-han-6man-in-band-signaling-for-transport-qos. > >> > >> RFC 6077 explains some of the issues that an in-band signaling > >> mechanism like Quick-Start has to solve. As far as I can tell, > >> the fundamental challenge is neither the protocol specification > >> nor a prototype implementation. For instance, it has been proven > >> that QuickStart TCP can be implemented e.g. in network processors > >> (see > >> http://www.ikr.uni-stuttgart.de/Content/Publications/Archive/Sf_Dis= s_40112.pdf > >> ). > >> > >> So, when updating the documents, I suggest to add a discussion of > >> how the open research issues explained in RFC 6077 are addressed. > >> > >> Michael > >> > >> *From:* Yingzhen Qu [mailto:yingzhen.ietf@gmail.com > >> ] > >> *Sent:* Sunday, March 04, 2018 9:59 PM > >> *To:* gorry@erg.abdn.ac.uk > >> *Cc:* Scharf, Michael (Nokia - DE/Stuttgart) > >> >; > >> Thomas Nadeau >> >; tcpm@ietf.org > >> ; Yingzhen Qu >> >; tsvwg@ietf.org > >> ; tsvwg-chairs@ietf.org > >> > >> *Subject:* Re: [tsvwg] Agenda requests for TSVWG@IETF101 > >> > >> Hi Gorry and Michael, > >> > >> Thanks for the suggestion, I'll request a presentation in ICCRG. > >> Meanwhile, I think since the in-band signaling draft was > >> presented in TSVWG, if time allows it still makes sense to > >> present this draft in TSVWG. > >> > >> The in-band signaling draft covers lots of aspects, and the > >> required changes include network layer and transport layer. We're > >> working on updating the draft, and may break it into pieces to > >> fit different WGs. > >> > >> Your comments and help are very much appreciated. > >> > >> Thanks, > >> > >> Yingzhen > >> > >> On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst > >> > wrote: > >> > >> I am unsure yet what the correct group of people world be to > >> explore a "Bandwidth Guaranteed Network". The presentation > >> last IETF looked like the work could imply a need for changes > >> proposed to the network layer (using OAM exchnages) to set > >> the sending rate and make those bandwidth reservations. In > >> the end, it could result in a protocol quite different to > >> TCP, I think this sort of change may possibly have a home in > >> TSVWG - but first I'd agree with Michaeland would encourage > >> a presentation of the problem statement in ICCRG to explore > >> the issues. > >> > >> Gorry > >> > >> On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) > >> wrote: > >> > >> > >> Hi all, > >> > >> >From the abstract: ??????This draft proposes a new TCP > >> congestion control algorithm used in bandwidth guaranteed > >> networks. It is an extension to the current TCP standards.= ??? > >> > >> In the IETF, I believe the expertise for this specific > >> document would be in TCPM, which in CC. If the authors > >> are interested in feedback on the proposed mechanism, I > >> would recommend to ask TCPM. > >> > >> Alternatively, corresponding research could perhaps be > >> performed in the ICCRG. ICCRG has published RFC 6077 to > >> document some of the open research issues in this space. > >> > >> Michael > >> > >> *From:*tsvwg [mailto:tsvwg-bounces@ietf.org > >> ] *On Behalf Of *Yingzhen Qu > >> *Sent:* Sunday, March 04, 2018 6:55 AM > >> *To:* tsvwg@ietf.org ; > >> tsvwg-chairs@ietf.org > >> *Cc:* Thomas Nadeau >> > > >> *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 > >> > >> Dear Chairs, > >> > >> A new draft (The draft was suggested by TSVWG @IETF100) > >> was just submitted, and we???d like to request a time slot > >> to present it @IETF101. > >> > >> Title:A New Congestion Control in Bandwidth Guaranteed > >> Network > >> > >> Presenter: Yingzhen Qu (Huawei) > >> > >> Time required (including Q/A): 10 mins > >> > >> Draft: > >> https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ > >> > >> > >> If there is any question, please kindly let us know. > >> > >> Thanks, > >> > >> Yingzhen > >> > >> > > -- --- tte@cs.fau.de From nobody Tue Mar 13 14:17:55 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 56FCC126CF6; Tue, 13 Mar 2018 14:17:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.959 X-Spam-Level: X-Spam-Status: No, score=-3.959 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xfQVGUylVnXf; Tue, 13 Mar 2018 14:17:45 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A7472126CD6; Tue, 13 Mar 2018 14:17:44 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 82B7B58C538; Tue, 13 Mar 2018 22:17:39 +0100 (CET) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 6B790B0DD05; Tue, 13 Mar 2018 22:17:39 +0100 (CET) Date: Tue, 13 Mar 2018 22:17:39 +0100 From: Toerless Eckert To: Lin Han Cc: Gorry Fairhurst , Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "Scharf, Michael (Nokia - DE/Stuttgart)" , "tsvwg-chairs@ietf.org" , Katsushi Kobayashi , Yingzhen Qu Message-ID: <20180313211739.GA19333@faui40p.informatik.uni-erlangen.de> References: <5A9BEB65.6010102@erg.abdn.ac.uk> <050065D2-5F2E-4E79-9BD1-E1DC03F13900@acm.org> <5AA79C2E.1040808@erg.abdn.ac.uk> <20180313164928.GA17042@faui40p.informatik.uni-erlangen.de> <1D30AF33624CDD4A99E8C395069A2A162CDB9BA3@sjceml521-mbs.china.huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1D30AF33624CDD4A99E8C395069A2A162CDB9BA3@sjceml521-mbs.china.huawei.com> User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 21:17:49 -0000 Thanks, Lin Let me also try another angle of comparison: Having worked on RSVP for a long time, your inband signaling draft is IMHO very easy to vet - lightweight inband signaling, replacing/simplifying/scaling the Intserv QoS model model for deterministic services. I think inband signaling could really be the antidote for what i would call the IETFs intserv "second system syndrom" trauma from NSIS and many ever more complex RSVP extensions never deployed. Compared to the work on inband signaling for DiffServ, i think we did not really have good attempts to do it for intserv. And ultimately, DiffServ inband signaling has been quite successful, and we also understand the dynamics needed to deploy it in various type of networks. last but not least ECN in the Internet. In fact, i think we are seeing with DiffServ a lot more difficult experiments, struggling with the complexities of control loops. TCP-QS is a great example: How do you even try to optimize in the real world a control loop with N-nodes on the path using their own "likely-best-useable-free-bandwidth" prediction based on a local algorithm ? I also did not see in the TCP-QS docs references to the impact of TCP behavior, (bursts), but its clear that the result will be different with most-bursty (classic TCP CC), DV, or even rate predictive (BBR etc.). How long are we working on bufferload reduction in our 'aqm' groups ? Give intserv a chance ;-) Cheers toerless On Tue, Mar 13, 2018 at 07:27:18PM +0000, Lin Han wrote: > Hi, Gorry/Toerless > > Here is some explanation and clarification for two drafts (draft-han-tsvwg-cc and draft-han-6man-in-band-signaling-for-transport-qos) > > 1. About draft-han-tsvwg-cc compared with other CC for bandwidth guaranteed network, such as gTFRC. > draft-han-tsvwg-cc is a split draft from draft-han-6man-in-band-signaling-for-transport-qos . It proposes a new CC for a network if the TCP session's bandwidth is guaranteed. Here the guaranteed bandwidth is per TCP session and described by PIR/CIR and given directly by TCP end user. > > 2. About TCP-QS and draft-han-6man-in-band-signaling-for-transport-qos > >From my understanding, TCP-QS and draft-han-6man-in-band-signaling-for-transport-qos do have similarity, both are kind of using in-band signaling for the resource reservation. But they still have big difference. > 1). draft-han-6man-in-band-signaling-for-transport-qos is more general in-band signaling method, it not only applies to TCP, but also UDP or other upper layer of protocol, even the draft only exemplifies the method to TCP. > 2). draft-han-6man-in-band-signaling-for-transport-qos provides reserved resource for bandwidth and latency for the whole life of TCP session. It gives more flavors and more granularity for the QoS (unlike TCP-QS only has 16 values of starting bandwidth). Moreover, it can support the "worst case latency" at each hop; also, it can support the OAM to detect the congestion states, and support the "forwarding state" for host to be notified in real-time about if the resource reservation or QoS forwarding is interrupted by abnormal situation such as link/node failures. > > Best regards > > Lin > > > -----Original Message----- > From: tsvwg [mailto:tsvwg-bounces@ietf.org] On Behalf Of Toerless Eckert > Sent: Tuesday, March 13, 2018 9:49 AM > To: Gorry Fairhurst > Cc: Thomas Nadeau ; tcpm@ietf.org; tsvwg@ietf.org; Scharf, Michael (Nokia - DE/Stuttgart) ; tsvwg-chairs@ietf.org; Katsushi Kobayashi ; Yingzhen Qu > Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) > > Thanks, Gory, nice explanation > > TCP Quickstart is rfc4782 btw. i think there was a buggy number in the thread. > > TCP quickstart really relates IMHO primarily to draft-han-6man-in-band-signaling-for-transport-qos, but not to draft-han-tsvwg-cc. The latter one is really meant to modify TCP assuming a known guaranteed CIR - whatever mechanism is used to provide that guarantee. > > TCP quickstart is an interesting example for inband signaling, which is what Lin's in-band-signaling draft does too. The main difference is that our draft focusses on high-value traffic where per-flow state is feasible and beneficial, if not necessary. And TCP quickstart seems more targeted to ANY TCP flow. Which raises a complete different scalability challenge to TCP quickstart. > > This type of comparison discussion will go into draft updates on our side. > > Would be interested in any more data points about the history of TCP quickstart, eg: where it was observed in the wild in deployments. > > Cheers > Toerless > > On Tue, Mar 13, 2018 at 09:38:54AM +0000, Gorry Fairhurst wrote: > > Maybe I'm saying what is obvious, but to be sure: > > > > The way I see QS is: > > - The router tracks the unutilised link capacity at the current time, > > and uses this as some estimate of what may be available to new flows > > in the near future. > > - The router responds to QS requests and can accept them if there is > > "unutilised capacity" remaining. > > - When accepted router updates it's count of the total unutilised > > capacity reducing by the accepted QS requests. (i.e., Subsequent QS > > requests in the same interval will currently have a smaller pool of > > unutilised capacity available). > > - After the end of the interval all "QS requests" expire and the > > router again makes a measure of the unutilised capacity at the current > > time. > > > > None of this implies a "reservation" of link resource in my thinking. > > In QS, the whole link capacity is intended to be shared using > > congestion control, and if flows start to send more using normal CC > > within the interval where QS is operating, they would simply receive a > > larger share of the capacity. That is: QS request didn't "allocate" > > any link resource. > > > > Gorry > > > > > > On 13/03/2018, 06:58, Katsushi Kobayashi wrote: > > >Hi, > > > > > >I think TCP QS router on the path also reserves bandwidth resource, > > >if it accepts a request. > > > > > >RFC4782 says: > > > If the router approves the Quick-Start Request, this approval SHOULD > > > be taken into account in the router's decision to accept or reject > > > subsequent Quick-Start Requests (e.g., using a variable that tracks > > > the recent aggregate of accepted Quick-Start Requests). > > > > > > > > >--- > > >Katsushi Kobayashi > > > > > >>2018/03/13 ??????3:43???Yingzhen Qu > >>> ????????????: > > >> > > >>Hi Michael, > > >>Sorry for the late response. > > >> > > >>Thanks for pointing out that we missed this important reference. > > >>You're right, Quick-Start and our proposal do have lots of > > >>similarities, for example both of them require that end-points and > > >>routers to work together. But they are also different in details. > > >>For example, in our proposal in-band signaling proposal bandwidth is > > >>reserved on routers along the path. > > >> > > >>In next version of this draft, We'll add discussions about RFC > > >>4728 and 6077. > > >> > > >>BTW, can I request a slot to present this draft in TCPM if time allows? > > >> > > >>Thanks, > > >>Yingzhen > > >> > > >>On Mon, Mar 5, 2018 at 12:09 AM, Scharf, Michael (Nokia - > > >>DE/Stuttgart) > >>> wrote: > > >> > > >> I believe that this proposal is similar to QuickStart TCP (RFC > > >> 4782), which is not cited in draft-han-tsvwg-cc, and the > > >> reference is also missing in > > >> draft-han-6man-in-band-signaling-for-transport-qos. > > >> > > >> RFC 6077 explains some of the issues that an in-band signaling > > >> mechanism like Quick-Start has to solve. As far as I can tell, > > >> the fundamental challenge is neither the protocol specification > > >> nor a prototype implementation. For instance, it has been proven > > >> that QuickStart TCP can be implemented e.g. in network processors > > >> (see > > >> http://www.ikr.uni-stuttgart.de/Content/Publications/Archive/Sf_Diss_40112.pdf > > >> ). > > >> > > >> So, when updating the documents, I suggest to add a discussion of > > >> how the open research issues explained in RFC 6077 are addressed. > > >> > > >> Michael > > >> > > >> *From:* Yingzhen Qu [mailto:yingzhen.ietf@gmail.com > > >> ] > > >> *Sent:* Sunday, March 04, 2018 9:59 PM > > >> *To:* gorry@erg.abdn.ac.uk > > >> *Cc:* Scharf, Michael (Nokia - DE/Stuttgart) > > >> >; > > >> Thomas Nadeau > >> >; tcpm@ietf.org > > >> ; Yingzhen Qu > >> >; tsvwg@ietf.org > > >> ; tsvwg-chairs@ietf.org > > >> > > >> *Subject:* Re: [tsvwg] Agenda requests for TSVWG@IETF101 > > >> > > >> Hi Gorry and Michael, > > >> > > >> Thanks for the suggestion, I'll request a presentation in ICCRG. > > >> Meanwhile, I think since the in-band signaling draft was > > >> presented in TSVWG, if time allows it still makes sense to > > >> present this draft in TSVWG. > > >> > > >> The in-band signaling draft covers lots of aspects, and the > > >> required changes include network layer and transport layer. We're > > >> working on updating the draft, and may break it into pieces to > > >> fit different WGs. > > >> > > >> Your comments and help are very much appreciated. > > >> > > >> Thanks, > > >> > > >> Yingzhen > > >> > > >> On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst > > >> > wrote: > > >> > > >> I am unsure yet what the correct group of people world be to > > >> explore a "Bandwidth Guaranteed Network". The presentation > > >> last IETF looked like the work could imply a need for changes > > >> proposed to the network layer (using OAM exchnages) to set > > >> the sending rate and make those bandwidth reservations. In > > >> the end, it could result in a protocol quite different to > > >> TCP, I think this sort of change may possibly have a home in > > >> TSVWG - but first I'd agree with Michaeland would encourage > > >> a presentation of the problem statement in ICCRG to explore > > >> the issues. > > >> > > >> Gorry > > >> > > >> On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) > > >> wrote: > > >> > > >> > > >> Hi all, > > >> > > >> >From the abstract: ??????This draft proposes a new TCP > > >> congestion control algorithm used in bandwidth guaranteed > > >> networks. It is an extension to the current TCP standards.??? > > >> > > >> In the IETF, I believe the expertise for this specific > > >> document would be in TCPM, which in CC. If the authors > > >> are interested in feedback on the proposed mechanism, I > > >> would recommend to ask TCPM. > > >> > > >> Alternatively, corresponding research could perhaps be > > >> performed in the ICCRG. ICCRG has published RFC 6077 to > > >> document some of the open research issues in this space. > > >> > > >> Michael > > >> > > >> *From:*tsvwg [mailto:tsvwg-bounces@ietf.org > > >> ] *On Behalf Of *Yingzhen Qu > > >> *Sent:* Sunday, March 04, 2018 6:55 AM > > >> *To:* tsvwg@ietf.org ; > > >> tsvwg-chairs@ietf.org > > >> *Cc:* Thomas Nadeau > >> > > > >> *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 > > >> > > >> Dear Chairs, > > >> > > >> A new draft (The draft was suggested by TSVWG @IETF100) > > >> was just submitted, and we???d like to request a time slot > > >> to present it @IETF101. > > >> > > >> Title:A New Congestion Control in Bandwidth Guaranteed > > >> Network > > >> > > >> Presenter: Yingzhen Qu (Huawei) > > >> > > >> Time required (including Q/A): 10 mins > > >> > > >> Draft: > > >> https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ > > >> > > >> > > >> If there is any question, please kindly let us know. > > >> > > >> Thanks, > > >> > > >> Yingzhen > > >> > > >> > > > > > -- > --- > tte@cs.fau.de -- --- tte@cs.fau.de From nobody Tue Mar 13 14:53:19 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 559EC126CF9; Tue, 13 Mar 2018 14:53:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.23 X-Spam-Level: X-Spam-Status: No, score=-4.23 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FDKShlm9u0Gb; Tue, 13 Mar 2018 14:53:09 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DCDB8126CD6; Tue, 13 Mar 2018 14:52:45 -0700 (PDT) Received: from lhreml709-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id 8E1057745657A; Tue, 13 Mar 2018 21:52:41 +0000 (GMT) Received: from SJCEML701-CHM.china.huawei.com (10.208.112.40) by lhreml709-cah.china.huawei.com (10.201.108.32) with Microsoft SMTP Server (TLS) id 14.3.382.0; Tue, 13 Mar 2018 21:52:43 +0000 Received: from SJCEML521-MBS.china.huawei.com ([169.254.2.168]) by SJCEML701-CHM.china.huawei.com ([169.254.3.93]) with mapi id 14.03.0382.000; Tue, 13 Mar 2018 14:52:35 -0700 From: Lin Han To: Toerless Eckert CC: Gorry Fairhurst , Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "Scharf, Michael (Nokia - DE/Stuttgart)" , "tsvwg-chairs@ietf.org" , Katsushi Kobayashi , Yingzhen Qu Thread-Topic: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) Thread-Index: AQHTuwFM3r3WTfYLEkqWf3ecaDUj6qPPIMSA//+TNEA= Date: Tue, 13 Mar 2018 21:52:34 +0000 Message-ID: <1D30AF33624CDD4A99E8C395069A2A162CDB9CE7@sjceml521-mbs.china.huawei.com> References: <5A9BEB65.6010102@erg.abdn.ac.uk> <050065D2-5F2E-4E79-9BD1-E1DC03F13900@acm.org> <5AA79C2E.1040808@erg.abdn.ac.uk> <20180313164928.GA17042@faui40p.informatik.uni-erlangen.de> <1D30AF33624CDD4A99E8C395069A2A162CDB9BA3@sjceml521-mbs.china.huawei.com> <20180313211739.GA19333@faui40p.informatik.uni-erlangen.de> In-Reply-To: <20180313211739.GA19333@faui40p.informatik.uni-erlangen.de> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.209.217.85] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 21:53:12 -0000 Right, Toerless. You gave a very good comparison.=20 If we must use a simplest sentence to describe our work, it would be "Intse= rv Renaissance by in-band signaling" Regards Lin -----Original Message----- From: Toerless Eckert [mailto:tte@cs.fau.de]=20 Sent: Tuesday, March 13, 2018 2:18 PM To: Lin Han Cc: Gorry Fairhurst ; Thomas Nadeau ; tcpm@ietf.org; tsvwg@ietf.org; Scharf, Michael (Nokia - DE/Stuttg= art) ; tsvwg-chairs@ietf.org; Katsushi Kobayashi = ; Yingzhen Qu Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101) Thanks, Lin Let me also try another angle of comparison:=20 Having worked on RSVP for a long time, your inband signaling draft is IMHO = very easy to vet - lightweight inband signaling, replacing/simplifying/scal= ing the Intserv QoS model model for deterministic services. I think inband signaling could really be the antidote for what i would call= the IETFs intserv "second system syndrom" trauma from NSIS and many ever m= ore complex RSVP extensions never deployed. Compared to the work on inband signaling for DiffServ, i think we did not r= eally have good attempts to do it for intserv. And ultimately, DiffServ inb= and signaling has been quite successful, and we also understand the dynamic= s needed to deploy it in various type of networks. last but not least ECN in the Internet. In fact, i think we are seeing with DiffServ a lot more difficult experimen= ts, struggling with the complexities of control loops. TCP-QS is a great example: How do you even try to optimize in the real worl= d a control loop with N-nodes on the path using their own "likely-best-usea= ble-free-bandwidth" prediction based on a local algorithm ? I also did not = see in the TCP-QS docs references to the impact of TCP behavior, (bursts), = but its clear that the result will be different with most-bursty (classic T= CP CC), DV, or even rate predictive (BBR etc.). How long are we working on = bufferload reduction in our 'aqm' groups ? Give intserv a chance ;-) Cheers toerless On Tue, Mar 13, 2018 at 07:27:18PM +0000, Lin Han wrote: > Hi, Gorry/Toerless >=20 > Here is some explanation and clarification for two drafts=20 > (draft-han-tsvwg-cc and=20 > draft-han-6man-in-band-signaling-for-transport-qos) >=20 > 1. About draft-han-tsvwg-cc compared with other CC for bandwidth guarante= ed network, such as gTFRC. > draft-han-tsvwg-cc is a split draft from draft-han-6man-in-band-signaling= -for-transport-qos . It proposes a new CC for a network if the TCP session'= s bandwidth is guaranteed. Here the guaranteed bandwidth is per TCP sessio= n and described by PIR/CIR and given directly by TCP end user.=20 >=20 > 2. About TCP-QS and draft-han-6man-in-band-signaling-for-transport-qos > >From my understanding, TCP-QS and draft-han-6man-in-band-signaling-for-t= ransport-qos do have similarity, both are kind of using in-band signaling f= or the resource reservation. But they still have big difference. > 1). draft-han-6man-in-band-signaling-for-transport-qos is more general in= -band signaling method, it not only applies to TCP, but also UDP or other u= pper layer of protocol, even the draft only exemplifies the method to TCP. > 2). draft-han-6man-in-band-signaling-for-transport-qos provides reserved = resource for bandwidth and latency for the whole life of TCP session. It gi= ves more flavors and more granularity for the QoS (unlike TCP-QS only has 1= 6 values of starting bandwidth). Moreover, it can support the "worst case l= atency" at each hop; also, it can support the OAM to detect the congestion = states, and support the "forwarding state" for host to be notified in real-= time about if the resource reservation or QoS forwarding is interrupted by = abnormal situation such as link/node failures. >=20 > Best regards >=20 > Lin >=20 >=20 > -----Original Message----- > From: tsvwg [mailto:tsvwg-bounces@ietf.org] On Behalf Of Toerless=20 > Eckert > Sent: Tuesday, March 13, 2018 9:49 AM > To: Gorry Fairhurst > Cc: Thomas Nadeau ; tcpm@ietf.org;=20 > tsvwg@ietf.org; Scharf, Michael (Nokia - DE/Stuttgart)=20 > ; tsvwg-chairs@ietf.org; Katsushi Kobayashi=20 > ; Yingzhen Qu > Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for=20 > TSVWG@IETF101) >=20 > Thanks, Gory, nice explanation >=20 > TCP Quickstart is rfc4782 btw. i think there was a buggy number in the th= read. >=20 > TCP quickstart really relates IMHO primarily to draft-han-6man-in-band-si= gnaling-for-transport-qos, but not to draft-han-tsvwg-cc. The latter one is= really meant to modify TCP assuming a known guaranteed CIR - whatever mech= anism is used to provide that guarantee. >=20 > TCP quickstart is an interesting example for inband signaling, which is w= hat Lin's in-band-signaling draft does too. The main difference is that our= draft focusses on high-value traffic where per-flow state is feasible and = beneficial, if not necessary. And TCP quickstart seems more targeted to ANY= TCP flow. Which raises a complete different scalability challenge to TCP q= uickstart. >=20 > This type of comparison discussion will go into draft updates on our side= . >=20 > Would be interested in any more data points about the history of TCP quic= kstart, eg: where it was observed in the wild in deployments. >=20 > Cheers > Toerless >=20 > On Tue, Mar 13, 2018 at 09:38:54AM +0000, Gorry Fairhurst wrote: > > Maybe I'm saying what is obvious, but to be sure: > >=20 > > The way I see QS is: > > - The router tracks the unutilised link capacity at the current=20 > > time, and uses this as some estimate of what may be available to new=20 > > flows in the near future. > > - The router responds to QS requests and can accept them if there is=20 > > "unutilised capacity" remaining. > > - When accepted router updates it's count of the total unutilised=20 > > capacity reducing by the accepted QS requests. (i.e., Subsequent QS=20 > > requests in the same interval will currently have a smaller pool of=20 > > unutilised capacity available). > > - After the end of the interval all "QS requests" expire and the=20 > > router again makes a measure of the unutilised capacity at the=20 > > current time. > >=20 > > None of this implies a "reservation" of link resource in my thinking.=20 > > In QS, the whole link capacity is intended to be shared using=20 > > congestion control, and if flows start to send more using normal CC=20 > > within the interval where QS is operating, they would simply receive=20 > > a larger share of the capacity. That is: QS request didn't "allocate" > > any link resource. > >=20 > > Gorry > >=20 > >=20 > > On 13/03/2018, 06:58, Katsushi Kobayashi wrote: > > >Hi, > > > > > >I think TCP QS router on the path also reserves bandwidth resource,=20 > > >if it accepts a request. > > > > > >RFC4782 says: > > > If the router approves the Quick-Start Request, this approval SHOUL= D > > > be taken into account in the router's decision to accept or reject > > > subsequent Quick-Start Requests (e.g., using a variable that tracks > > > the recent aggregate of accepted Quick-Start Requests). > > > > > > > > >--- > > >Katsushi Kobayashi > > > > > >>2018/03/13 ??????3:43???Yingzhen Qu > >>> ????????????: > > >> > > >>Hi Michael, > > >>Sorry for the late response. > > >> > > >>Thanks for pointing out that we missed this important reference. > > >>You're right, Quick-Start and our proposal do have lots of=20 > > >>similarities, for example both of them require that end-points and=20 > > >>routers to work together. But they are also different in details. > > >>For example, in our proposal in-band signaling proposal bandwidth=20 > > >>is reserved on routers along the path. > > >> > > >>In next version of this draft, We'll add discussions about RFC > > >>4728 and 6077. > > >> > > >>BTW, can I request a slot to present this draft in TCPM if time allow= s? > > >> > > >>Thanks, > > >>Yingzhen > > >> > > >>On Mon, Mar 5, 2018 at 12:09 AM, Scharf, Michael (Nokia - > > >>DE/Stuttgart) > >>> wrote: > > >> > > >> I believe that this proposal is similar to QuickStart TCP (RFC > > >> 4782), which is not cited in draft-han-tsvwg-cc, and the > > >> reference is also missing in > > >> draft-han-6man-in-band-signaling-for-transport-qos. > > >> > > >> RFC 6077 explains some of the issues that an in-band signaling > > >> mechanism like Quick-Start has to solve. As far as I can tell, > > >> the fundamental challenge is neither the protocol specification > > >> nor a prototype implementation. For instance, it has been proven > > >> that QuickStart TCP can be implemented e.g. in network processors > > >> (see > > >> http://www.ikr.uni-stuttgart.de/Content/Publications/Archive/Sf_D= iss_40112.pdf > > >> ). > > >> > > >> So, when updating the documents, I suggest to add a discussion of > > >> how the open research issues explained in RFC 6077 are addressed. > > >> > > >> Michael > > >> > > >> *From:* Yingzhen Qu [mailto:yingzhen.ietf@gmail.com > > >> ] > > >> *Sent:* Sunday, March 04, 2018 9:59 PM > > >> *To:* gorry@erg.abdn.ac.uk > > >> *Cc:* Scharf, Michael (Nokia - DE/Stuttgart) > > >> >; > > >> Thomas Nadeau > >> >; tcpm@ietf.org > > >> ; Yingzhen Qu > >> >; tsvwg@ietf.org > > >> ; tsvwg-chairs@ietf.org > > >> > > >> *Subject:* Re: [tsvwg] Agenda requests for TSVWG@IETF101 > > >> > > >> Hi Gorry and Michael, > > >> > > >> Thanks for the suggestion, I'll request a presentation in ICCRG. > > >> Meanwhile, I think since the in-band signaling draft was > > >> presented in TSVWG, if time allows it still makes sense to > > >> present this draft in TSVWG. > > >> > > >> The in-band signaling draft covers lots of aspects, and the > > >> required changes include network layer and transport layer. We're > > >> working on updating the draft, and may break it into pieces to > > >> fit different WGs. > > >> > > >> Your comments and help are very much appreciated. > > >> > > >> Thanks, > > >> > > >> Yingzhen > > >> > > >> On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst > > >> > wrote: > > >> > > >> I am unsure yet what the correct group of people world be to > > >> explore a "Bandwidth Guaranteed Network". The presentation > > >> last IETF looked like the work could imply a need for changes > > >> proposed to the network layer (using OAM exchnages) to set > > >> the sending rate and make those bandwidth reservations. In > > >> the end, it could result in a protocol quite different to > > >> TCP, I think this sort of change may possibly have a home in > > >> TSVWG - but first I'd agree with Michaeland would encourage > > >> a presentation of the problem statement in ICCRG to explore > > >> the issues. > > >> > > >> Gorry > > >> > > >> On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) > > >> wrote: > > >> > > >> > > >> Hi all, > > >> > > >> >From the abstract: ??????This draft proposes a new TCP > > >> congestion control algorithm used in bandwidth guaranteed > > >> networks. It is an extension to the current TCP standard= s.??? > > >> > > >> In the IETF, I believe the expertise for this specific > > >> document would be in TCPM, which in CC. If the authors > > >> are interested in feedback on the proposed mechanism, I > > >> would recommend to ask TCPM. > > >> > > >> Alternatively, corresponding research could perhaps be > > >> performed in the ICCRG. ICCRG has published RFC 6077 to > > >> document some of the open research issues in this space. > > >> > > >> Michael > > >> > > >> *From:*tsvwg [mailto:tsvwg-bounces@ietf.org > > >> ] *On Behalf Of *Yingzhen = Qu > > >> *Sent:* Sunday, March 04, 2018 6:55 AM > > >> *To:* tsvwg@ietf.org ; > > >> tsvwg-chairs@ietf.org > > >> *Cc:* Thomas Nadeau > >> > > > >> *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 > > >> > > >> Dear Chairs, > > >> > > >> A new draft (The draft was suggested by TSVWG @IETF100) > > >> was just submitted, and we???d like to request a time slo= t > > >> to present it @IETF101. > > >> > > >> Title:A New Congestion Control in Bandwidth Guaranteed > > >> Network > > >> > > >> Presenter: Yingzhen Qu (Huawei) > > >> > > >> Time required (including Q/A): 10 mins > > >> > > >> Draft: > > >> https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ > > >> > > >> > > >> If there is any question, please kindly let us know. > > >> > > >> Thanks, > > >> > > >> Yingzhen > > >> > > >> > > > >=20 > -- > --- > tte@cs.fau.de -- --- tte@cs.fau.de From nobody Wed Mar 14 00:56:09 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B710412708C for ; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 6d7babf2-0824-4640-bfc3-08d5898106db X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Mar 2018 07:56:00.0273 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 92e84ceb-fbfd-47ab-be52-080c6b87953f X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR0702MB3740 X-OriginatorOrg: ericsson.com X-Brightmail-Tracker: H4sIAAAAAAAAA02Se0hTYRjG+c7N42p08oIvXqIGQd6mlsQqsaI/XFeKCGIWufSg0pyyY0Ml wkuZrEKZKEyxLZjzklTa1CJN20pdkXkLU7NCxVITbZCXdJHbWdB/v+d9Ht7Lx0fjXnrSn05V ZrIqpVwhogSE7nzrvvDSD7WyyOYXuKTT8MxD8kZPSFpsekzS9WOckvQOr+GHSKmucR5Jb7ya J6VG4yomLW20UqcJmSAmiVWkqllVRGyCIKV9yUpltAdldQ0OY7lIDxrkSQMTDfVTbZgGCWgv xorAYbSRvDAj6O83e/BiGcFKfr47Vo1ByWudSxCMHYOq7nKCd7QYNK7fo3gxjaAsz0E5x1BM DNRZlpGTfZhTMFO76JqCMzUI1gyLuNPwZuKhpMe8YdAboQugK9rB58Ww0L9IOJlgdsLN4gLM yUImAZaKta6eiAmCL8ufXRmc8YPRKT3Gn8eAse09zrMvzEz+Ifl8IthH7pJ8fTusD0xQPAfB gP424rkFA+M4wXMUdNd1uPv0kVBtvMzzSejQdrqeApgxBL8Ge9yNwqCqrNDN6TCSP+teSAET ujL34Docpu1xJSii4r+9eQ4Dw3M7xXMomO7P4RWum7eCTTdFGBBRj3w5luPSknfvEbOq1ESO S1eKlWxmE9r4Ni/Na+FP0YO5wxbE0Ei0Wajpr5V5kXI1l51mQUDjIh9hc+BGSZgkz85hVemX VFcVLGdBATQh8hPajgplXkyyPJO9wrIZrOqfi9Ge/rnIZFfH3Wkbf/TxWnZDw4EcI1m5en1g 197Z6IKsi00hxf6m2O+jT4bEx7f09lklo630tOzTCYdA2BbZ/rP33O+Z1E1DfWMxpZ2OmlDD ilrSEfiOHN6v1DjyVsvZIu3CwVsBlcE+x75uOxOcXTn57WFhfEONqOexyYQVIO+3Z0dbjogI LkUeFYKrOPlfQpHSyTIDAAA= Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Mar 2018 07:56:08 -0000 Hi This subject pops up every once in a while.=20 I would like to add my perspective, given how I understand that 3GPP techno= logy works. The 3GPP QoS framework can be used to offer for instance a Guar= anteed bandwidth (GBR) to applications. The operation is that the "bearer" = gets increased scheduling priority once the throughput is below the GBR val= ue. In simulations I have verified that this framework can deliver a GBR to TCP= flows when the network load increases, at least as long it is possible to = push back other bearers with a lower priority. So, seen from my experience = so far I am not fully confident that additional inband signaling is needed.= =20 There can however be a benefit to e.g. determine an appropriate bitrate for= a DASH session, depending on network load and/or coverage, but I would arg= ue that out of band signaling is better in this case. As regards to "worst case latency", I am not sure that I follow here, are w= e discussing TSN/Detnet technology here, general link failures, or is it ab= out means to control the queue delay in the network ?. As to the latter, I = believe that it is worthwhile to look more closely at L4S.=20 Regards Ingemar Johansson > Message: 2 > Date: Tue, 13 Mar 2018 19:27:18 +0000 > From: Lin Han > To: Toerless Eckert , Gorry Fairhurst > > Cc: Thomas Nadeau , "tcpm@ietf.org" > , "tsvwg@ietf.org" , "Scharf, > Michael > (Nokia - DE/Stuttgart)" , > "tsvwg-chairs@ietf.org" , Katsushi Kobayashi > , Yingzhen Qu > Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests > for TSVWG@IETF101) > Message-ID: > <1D30AF33624CDD4A99E8C395069A2A162CDB9BA3@sjceml521- > mbs.china.huawei.com> >=20 > Content-Type: text/plain; charset=3D"us-ascii" >=20 > Hi, Gorry/Toerless >=20 > Here is some explanation and clarification for two drafts (draft-han-tsvw= g-cc > and draft-han-6man-in-band-signaling-for-transport-qos) >=20 > 1. About draft-han-tsvwg-cc compared with other CC for bandwidth > guaranteed network, such as gTFRC. > draft-han-tsvwg-cc is a split draft from draft-han-6man-in-band-signaling= -for- > transport-qos . It proposes a new CC for a network if the TCP session's > bandwidth is guaranteed. Here the guaranteed bandwidth is per TCP sessio= n > and described by PIR/CIR and given directly by TCP end user. >=20 > 2. About TCP-QS and draft-han-6man-in-band-signaling-for-transport-qos > >From my understanding, TCP-QS and draft-han-6man-in-band-signaling-for- > transport-qos do have similarity, both are kind of using in-band signalin= g for > the resource reservation. But they still have big difference. > 1). draft-han-6man-in-band-signaling-for-transport-qos is more general in= - > band signaling method, it not only applies to TCP, but also UDP or other > upper layer of protocol, even the draft only exemplifies the method to TC= P. > 2). draft-han-6man-in-band-signaling-for-transport-qos provides reserved > resource for bandwidth and latency for the whole life of TCP session. It = gives > more flavors and more granularity for the QoS (unlike TCP-QS only has 16 > values of starting bandwidth). Moreover, it can support the "worst case > latency" at each hop; also, it can support the OAM to detect the congesti= on > states, and support the "forwarding state" for host to be notified in rea= l-time > about if the resource reservation or QoS forwarding is interrupted by > abnormal situation such as link/node failures. >=20 > Best regards >=20 > Lin >=20 From nobody Wed Mar 14 02:31:48 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B4269127876; Wed, 14 Mar 2018 02:31:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.491 X-Spam-Level: X-Spam-Status: No, score=-2.491 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, T_DKIM_INVALID=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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a=rsa-sha256; c=relaxed/relaxed; d=vodafone.onmicrosoft.com; s=selector1-vodafone-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=tVpQ2hz9Li4vFmAtyfQXNNirUBn8yyePajiJU16iuhE=; b=Mi8V7ecWbhhJB31hSnxj76EBpeq6Bq2tACG4JMswX1wlMiswtr3SRbRKB+rT5Yb5hCOhRyD8jITQEq8ADhz+APSfvUNFINGBfNcY/DyLmL5jlxEw9hqMxXgV5UtxMfswGIyFtfVtVJZCxRaOUMqkZxnqQjvrg83wADI9RKxbM0A= x-ms-exchange-crosstenant-network-message-id: 8038049b-8d32-47d2-79ac-08d5898e55aa x-ms-exchange-crosstenant-originalarrivaltime: 14 Mar 2018 09:31:15.6827 (UTC) x-ms-exchange-crosstenant-fromentityheader: Hosted x-ms-exchange-crosstenant-id: 68283f3b-8487-4c86-adb3-a5228f18b893 x-ms-exchange-transport-crosstenantheadersstamped: HE1PR05MB1306 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: vodafone.com Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Mar 2018 09:31:44 -0000 HI Ingemar, > The 3GPP QoS framework can be used to offer for instance a Guaranteed ban= dwidth (GBR) to applications. The operation is that the "bearer" gets incre= ased scheduling priority once the throughput is below the GBR value. That is technically correct: but a consideration to note here is that in LT= E, operators typically operate only two bearers - one for IMS/VoLTE, which = is GBR; and one 'best effort' (non-GBR) bearer for Internet traffic. This = is likely due to non-technical reasons. Hence I also favour a bearer*-agnostic approach such as L4S, but appreciate= that L4S will also have to operate within the constraints of the radio sch= eduler (which will still be 'best effort') For 5G, certainly there can be more flexible and holistic scheduling approa= ches. For practical implementation though, all 'prioritisations' will need = to meet regulatory directives on traffic management. * i.e. GBR vs non-GBR bearer All best, Kevin Vodafone Proprietary classified as C2 - Internal -----Original Message----- From: tsvwg [mailto:tsvwg-bounces@ietf.org] On Behalf Of Ingemar Johansson = S Sent: 14 March 2018 07:56 To: Lin.Han@huawei.com; tte@cs.fau.de Cc: Ingemar Johansson S ; tcpm@ietf.org; = tsvwg@ietf.org; 'iccrg@irtf.org' Subject: Re: [tsvwg] [tcpm] inband signaling (was: Re: Agenda requests for = TSVWG@IETF101) Hi This subject pops up every once in a while. I would like to add my perspective, given how I understand that 3GPP techno= logy works. The 3GPP QoS framework can be used to offer for instance a Guar= anteed bandwidth (GBR) to applications. The operation is that the "bearer" = gets increased scheduling priority once the throughput is below the GBR val= ue. In simulations I have verified that this framework can deliver a GBR to TCP= flows when the network load increases, at least as long it is possible to = push back other bearers with a lower priority. So, seen from my experience = so far I am not fully confident that additional inband signaling is needed. There can however be a benefit to e.g. determine an appropriate bitrate for= a DASH session, depending on network load and/or coverage, but I would arg= ue that out of band signaling is better in this case. As regards to "worst case latency", I am not sure that I follow here, are w= e discussing TSN/Detnet technology here, general link failures, or is it ab= out means to control the queue delay in the network ?. As to the latter, I = believe that it is worthwhile to look more closely at L4S. Regards Ingemar Johansson > Message: 2 > Date: Tue, 13 Mar 2018 19:27:18 +0000 > From: Lin Han > To: Toerless Eckert , Gorry Fairhurst > > Cc: Thomas Nadeau , "tcpm@ietf.org" > , "tsvwg@ietf.org" , "Scharf, Michael > (Nokia - DE/Stuttgart)" , > "tsvwg-chairs@ietf.org" , Katsushi Kobayashi > , Yingzhen Qu > Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests > for TSVWG@IETF101) > Message-ID: > <1D30AF33624CDD4A99E8C395069A2A162CDB9BA3@sjceml521- > mbs.china.huawei.com> > > Content-Type: text/plain; charset=3D"us-ascii" > > Hi, Gorry/Toerless > > Here is some explanation and clarification for two drafts > (draft-han-tsvwg-cc and > draft-han-6man-in-band-signaling-for-transport-qos) > > 1. About draft-han-tsvwg-cc compared with other CC for bandwidth > guaranteed network, such as gTFRC. > draft-han-tsvwg-cc is a split draft from > draft-han-6man-in-band-signaling-for- > transport-qos . It proposes a new CC for a network if the TCP > session's bandwidth is guaranteed. Here the guaranteed bandwidth is > per TCP session and described by PIR/CIR and given directly by TCP end us= er. > > 2. About TCP-QS and draft-han-6man-in-band-signaling-for-transport-qos > >From my understanding, TCP-QS and > >draft-han-6man-in-band-signaling-for- > transport-qos do have similarity, both are kind of using in-band > signaling for the resource reservation. But they still have big differenc= e. > 1). draft-han-6man-in-band-signaling-for-transport-qos is more general > in- band signaling method, it not only applies to TCP, but also UDP or > other upper layer of protocol, even the draft only exemplifies the method= to TCP. > 2). draft-han-6man-in-band-signaling-for-transport-qos provides > reserved resource for bandwidth and latency for the whole life of TCP > session. It gives more flavors and more granularity for the QoS > (unlike TCP-QS only has 16 values of starting bandwidth). Moreover, it > can support the "worst case latency" at each hop; also, it can support > the OAM to detect the congestion states, and support the "forwarding > state" for host to be notified in real-time about if the resource > reservation or QoS forwarding is interrupted by abnormal situation such a= s link/node failures. > > Best regards > > Lin > From nobody Wed Mar 14 08:01:55 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4B24C1205D3; Tue, 13 Mar 2018 19:08:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.689 X-Spam-Level: X-Spam-Status: No, score=-2.689 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_FREEMAIL_DOC_PDF=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gqq4LtUEW_vW; Tue, 13 Mar 2018 19:08:18 -0700 (PDT) Received: from mail-qk0-x22b.google.com (mail-qk0-x22b.google.com [IPv6:2607:f8b0:400d:c09::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8AEF8126B6D; Tue, 13 Mar 2018 19:08:17 -0700 (PDT) Received: by mail-qk0-x22b.google.com with SMTP id y137so1906845qka.4; Tue, 13 Mar 2018 19:08:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=HfnzU2hP7I3yGobT05VMt9x+7v22y44q+46KzQZ7noY=; b=gXRAvaYk6vsGtMNRVSSnjdRd24vh5XVycsNnSMUAIjHKVd3T9MWbyygOKKfvbFVf6s Xoy5rI+i5z03uk9hYeXcVo9m5ZmrxKmHSoWCI135oeV3JKBZ9x4j5jVKtZk9zkF2+SLh 7qhp0YDbiTOdEG7KS5q3k2ZWhh8RGwxr30di0BIOcI0wgLG9PDCJWI8o+N0hyvrwyuGm YLzZEzGNCD2nkL7Qs394TnXWSZ67TGTO59I8dzjUi+UvQZ3YHLRbXosk9ukLuHQ+ZO+7 tlFfwJXkbami9pdDb2SScWPvJTTbM3dRhkG9qTmiZf5kibk1ZjuxrMAiJ1shTP4cbz14 ZzgQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=HfnzU2hP7I3yGobT05VMt9x+7v22y44q+46KzQZ7noY=; b=j6zrmvrIk2nb1Ys9vmsd4Y4IeR2zBY8QxnfcnjAP8qE5svhR3THrvSd0ntkUu9O8xn VKcvWvMgg8Qj4jOWJwPUxyhsbPJxD3fN6j76ALtxC6PXzZ5lUdA0s5XkjteMiroWhOVd c4ZYe50801n2cHDAoX/K4pKcjtUREe9/zyoWRA/EwKp7iPFznNhM0XoNIv1tUWJa/0U1 YSvs+XLEFwCwJqMw0pjhCje6UAUh0OCTUkMPOehRymCwfx1i64vRccpndhBR3P5DvfpF IPuj0zmksjj0XnZgTYqKhpVFDhK6S6/dHNX7AGTAgUYRdyFdd+DNx9EFl9YplS6udVWe /GyQ== X-Gm-Message-State: AElRT7E5V9Q3CIrD+uwUlwN7lvl4u+xprRTHcKJ5BrdbkdWyfEG1j1ux J6yfiv+y4M05kWv2BdxGadDh9PvDja5fMjQYGUBu X-Google-Smtp-Source: AG47ELsU0hY6++xdRq0R3uhRbffKzRUus/sdQJAaFiWadNREjh8kZeG0WQ5LmVeVeHotOIwpSFw2kk3aDKfEOx+QXzA= X-Received: by 10.55.189.196 with SMTP id n187mr4287137qkf.141.1520993296287; Tue, 13 Mar 2018 19:08:16 -0700 (PDT) MIME-Version: 1.0 Received: by 10.237.60.123 with HTTP; Tue, 13 Mar 2018 19:08:15 -0700 (PDT) In-Reply-To: <5AA7A614.3050706@erg.abdn.ac.uk> References: <5A9BEB65.6010102@erg.abdn.ac.uk> <430A7C48-DA1D-4D73-AB40-F2B30A8E8580@lurchi.franken.de> <5AA7A614.3050706@erg.abdn.ac.uk> From: Yingzhen Qu Date: Tue, 13 Mar 2018 19:08:15 -0700 Message-ID: To: gorry@erg.abdn.ac.uk, lin.han@huawei.com Cc: "tcpm-chairs@ietf.org" , "tsvwg-chairs@ietf.org" Content-Type: multipart/mixed; boundary="94eb2c043d8a21cfc1056755d98a" Archived-At: X-Mailman-Approved-At: Wed, 14 Mar 2018 08:01:54 -0700 Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Mar 2018 02:08:21 -0000 --94eb2c043d8a21cfc1056755d98a Content-Type: multipart/alternative; boundary="94eb2c043d8a21cfbc056755d988" --94eb2c043d8a21cfbc056755d988 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi chairs, Sorry for all the confusions and troubles here. We originally requested a slot in TSVWG considering the in-band signaling draft was presented there at last IETF. Since we didn't receive a confirmation and also noticed that TSVWG already has a full schedule, hence sent a request to TCPM. So far, no request sent to ICCRG yet. We'd be happy to present it at either or both WGs. This congestion control draft is a split of the in-band signaling draft per the comments we received, and we plan to further split that draft based on comments (potentially with one in Routing area focusing on ip signaling part). At this IETF, we=E2=80=99ve requested to present the resource reservation usin= g in-band signaling in HotRFC lightning talk. I=E2=80=99m also attaching the slides for the congestion control draft presentation. Your comments are very much appreciated. Title: A New Congestion Control in Bandwidth Guaranteed Network Presenter: Yingzhen Qu (Huawei) Time required (including Q/A): 10 mins Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ Thanks, Yingzhen On Tue, Mar 13, 2018 at 3:21 AM, Gorry Fairhurst wrote: > Hi Chairs... > > I think we should coordinate:-) > > The history I know is (please add). I think I'd benefit from more thought= s > by others. > > There is work in ETSI by various companies on next generation protocols. > The work is diverse and most of it aims at significant changes to IP. I > spoke with some people (by no means all) who attend, and they suggested a= t > this time there was no consensus on what they thought was the best > direction. > > We saw presentations on the overall architecture last IETF. There was > discussions in 6man, intarea, tsvwg, and possibly other places. I saw > significant push-back from others on the idea of introducing a new QoS > model, but what they proposed was complex and had not been discussed much > prior to the IETF meeting, so it may hard to understand by people. > > A key question is whether this can work on a path that does not include > one specific vendor's equipment. What I understood was that it relied on > OAM information about the path. This phrase in the latest draft seems to > agree with what I think was presented last IETF: > "When a sender receives the third duplicated ACK, but no previous > OAM congestion alarm has been received, then it is considered that > a segment is lost due to random failure not congestion. In this > case the cwnd is not changed." > > As for TSVWG, we have had quite a long discussion with the authors at the > meeting and after. The TSV chairs encouraged them to take the CC aspects > separately and explain why this method is better and detail what this > benefit is and what is required in the router to allow this. We suggested > an initial talk in ICCRG to present results and show *why* this is > attractive. As far as I know they requested time to do this. > > They also requested time in TSVWG - but there's (as yet) been little > discssion on the list, so we curently advise them to prepare a slide to > show to say why people should read the draft. We have not decided (yet) t= o > give time to this new framework. > > They have now also requested time in TCPM. > > I don't know whethere this time they are also requesting slots some other > places to discuss other aspects. > > I also suggested (informally) that they should try making a great short > presentation of how this is a new opportunity and whar has changed since = we > last saw schemes proposed. I do see that there are significant advances i= n > router forwarding hardware - and I suspect there could be similar ideas i= n > cisco, etc.Would other vendors (or operators) be interested in > standardising this? I think such a talk could be put to TSVAREA. > > Gorry > > > On 13/03/2018, 09:45, Michael Tuexen wrote: > >> On 13. Mar 2018, at 07:43, Yingzhen Qu wrote: >>> >>> Hi Michael, >>> >>> Sorry for the late response. >>> >>> Thanks for pointing out that we missed this important reference. You're >>> right, Quick-Start and our proposal do have lots of similarities, for >>> example both of them require that end-points and routers to work togeth= er. >>> But they are also different in details. For example, in our proposal >>> in-band signaling proposal bandwidth is reserved on routers along the p= ath. >>> >>> In next version of this draft, We'll add discussions about RFC 4728 and >>> 6077. >>> >>> BTW, can I request a slot to present this draft in TCPM if time allows? >>> >> How much time would you need? >> >> Best regards >> Michael >> >>> Thanks, >>> Yingzhen >>> >>> On Mon, Mar 5, 2018 at 12:09 AM, Scharf, Michael (Nokia - DE/Stuttgart)= < >>> michael.scharf@nokia.com> wrote: >>> I believe that this proposal is similar to QuickStart TCP (RFC 4782), >>> which is not cited in draft-han-tsvwg-cc, and the reference is also mis= sing >>> in draft-han-6man-in-band-signaling-for-transport-qos. >>> >>> >>> >>> RFC 6077 explains some of the issues that an in-band signaling mechanis= m >>> like Quick-Start has to solve. As far as I can tell, the fundamental >>> challenge is neither the protocol specification nor a prototype >>> implementation. For instance, it has been proven that QuickStart TCP ca= n be >>> implemented e.g. in network processors (see >>> http://www.ikr.uni-stuttgart.de/Content/Publications/Archive >>> /Sf_Diss_40112.pdf). >>> >>> >>> >>> So, when updating the documents, I suggest to add a discussion of how >>> the open research issues explained in RFC 6077 are addressed. >>> >>> >>> >>> Michael >>> >>> >>> >>> >>> >>> From: Yingzhen Qu [mailto:yingzhen.ietf@gmail.com] >>> Sent: Sunday, March 04, 2018 9:59 PM >>> To: gorry@erg.abdn.ac.uk >>> Cc: Scharf, Michael (Nokia - DE/Stuttgart); >>> Thomas Nadeau; tcpm@ietf.org; Yingzhen Qu< >>> yingzhen.qu@huawei.com>; tsvwg@ietf.org; tsvwg-chairs@ietf.org >>> Subject: Re: [tsvwg] Agenda requests for TSVWG@IETF101 >>> >>> >>> >>> Hi Gorry and Michael, >>> >>> >>> >>> Thanks for the suggestion, I'll request a presentation in ICCRG. >>> Meanwhile, I think since the in-band signaling draft was presented in >>> TSVWG, if time allows it still makes sense to present this draft in TSV= WG. >>> >>> >>> >>> The in-band signaling draft covers lots of aspects, and the required >>> changes include network layer and transport layer. We're working on >>> updating the draft, and may break it into pieces to fit different WGs. >>> >>> >>> >>> Your comments and help are very much appreciated. >>> >>> >>> >>> Thanks, >>> >>> Yingzhen >>> >>> >>> >>> On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst >>> wrote: >>> >>> I am unsure yet what the correct group of people world be to explore a >>> "Bandwidth Guaranteed Network". The presentation last IETF looked like = the >>> work could imply a need for changes proposed to the network layer (usin= g >>> OAM exchnages) to set the sending rate and make those bandwidth >>> reservations. In the end, it could result in a protocol quite differen= t to >>> TCP, I think this sort of change may possibly have a home in TSVWG - b= ut >>> first I'd agree with Michaeland would encourage a presentation of the >>> problem statement in ICCRG to explore the issues. >>> >>> Gorry >>> >>> On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) wrote: >>> >>> >>> Hi all, >>> >>> > From the abstract: =E2=80=9C=E2=80=A6This draft proposes a new TCP co= ngestion control >>> algorithm used in bandwidth guaranteed networks. It is an extension to= the >>> current TCP standards.=E2=80=9D >>> >>> In the IETF, I believe the expertise for this specific document would b= e >>> in TCPM, which in CC. If the authors are interested in feedback on the >>> proposed mechanism, I would recommend to ask TCPM. >>> >>> Alternatively, corresponding research could perhaps be performed in the >>> ICCRG. ICCRG has published RFC 6077 to document some of the open resear= ch >>> issues in this space. >>> >>> Michael >>> >>> *From:*tsvwg [mailto:tsvwg-bounces@ietf.org] *On Behalf Of *Yingzhen Qu >>> *Sent:* Sunday, March 04, 2018 6:55 AM >>> *To:* tsvwg@ietf.org; tsvwg-chairs@ietf.org >>> *Cc:* Thomas Nadeau >>> *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 >>> >>> Dear Chairs, >>> >>> A new draft (The draft was suggested by TSVWG @IETF100) was just >>> submitted, and we=E2=80=99d like to request a time slot to present it @= IETF101. >>> >>> Title:A New Congestion Control in Bandwidth Guaranteed Network >>> >>> Presenter: Yingzhen Qu (Huawei) >>> >>> Time required (including Q/A): 10 mins >>> >>> Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ >>> >>> If there is any question, please kindly let us know. >>> >>> Thanks, >>> >>> Yingzhen >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> tcpm mailing list >>> tcpm@ietf.org >>> https://www.ietf.org/mailman/listinfo/tcpm >>> >> > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm > --94eb2c043d8a21cfbc056755d988 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hi chairs,

=C2=A0

Sorry for all the con= fusions and troubles here.

=C2=A0

We originally request= ed a slot in TSVWG considering the in-band signaling draft was presented there a= t last IETF. Since we didn't receive a confirmation and also noticed that= TSVWG already has a full schedule, hence sent a request to TCPM. So far, no reque= st sent to ICCRG yet.

=C2=A0

We'd be happy to = present it at either or both WGs. This congestion control draft is a split of the in-b= and signaling draft per the comments we received, and we plan to further split = that draft based on comments (potentially=C2=A0with one in Routing area focusing= on ip signaling part). At this IETF, we=E2=80=99ve requested to present the re= source reservation using in-band signaling in HotRFC lightning talk.<= /span>

=C2=A0

I=E2=80=99m also atta= ching the slides for the congestion control draft presentation. Your comments are very much appreciated.

=C2=A0

Title:=C2=A0A New Con= gestion Control in Bandwidth Guaranteed Network

Presenter: Yingzhen Q= u (Huawei)

Time required (includ= ing Q/A): 10 mins

Draft:=C2=A0https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/


Thanks,

Yingzhen


On Tue, Mar= 13, 2018 at 3:21 AM, Gorry Fairhurst <gorry@erg.abdn.ac.uk> wrote:
Hi Chairs...

I think we should coordinate:-)

The history I know is (please add). I think I'd benefit from more thoug= hts by others.

There is work in ETSI by various companies on next generation protocols. Th= e work is diverse and most of it aims at significant changes to IP. I spoke= with some people (by no means all) who attend, and they suggested at this = time there was no consensus on what they thought was the best direction.
We saw presentations on the overall architecture last IETF. There was discu= ssions in 6man, intarea, tsvwg, and possibly other places. I saw significan= t push-back from others on the idea of introducing a new QoS model, but wha= t they proposed was complex and had not been discussed much prior to the IE= TF meeting, so it may hard to understand by people.

A key question is whether this can work on a path that does not include one= specific vendor's equipment. What I understood was that it relied on O= AM information about the path.=C2=A0 This phrase in the latest draft seems = to agree with what I think was presented last IETF:
=C2=A0 =C2=A0 "When a sender receives the third duplicated ACK, but no= previous
=C2=A0 =C2=A0 =C2=A0 OAM congestion alarm has been received, then it is con= sidered that
=C2=A0 =C2=A0 =C2=A0 a segment is lost due to random failure not congestion= .=C2=A0 In this
=C2=A0 =C2=A0 =C2=A0 case the cwnd is not changed."

As for TSVWG, we have had quite a long discussion with the authors at the m= eeting and after. The TSV chairs encouraged them to take the CC aspects sep= arately and explain why this method is better and detail what this benefit = is and what is required in the router to allow this. We suggested an initia= l talk in ICCRG to present results and show *why* this is attractive. As fa= r as I know they requested time to do this.

They also requested time in TSVWG - but there's (as yet) been little di= scssion on the list, so we curently advise them to prepare a slide to show = to say why people should read the draft. We have not decided (yet) to give = time to this new framework.

They have now also requested time in TCPM.

I don't know whethere this time they are also requesting slots some oth= er places to discuss other aspects.

I also suggested (informally) that they should try making a great short pre= sentation of how this is a new opportunity and whar has changed since we la= st saw schemes proposed. I do see that there are significant advances in ro= uter forwarding hardware - and I suspect there could be similar ideas in ci= sco, etc.Would other vendors (or operators) be interested in standardising = this? I think such a talk could be put to TSVAREA.

Gorry


On 13/03/2018, 09:45, Michael Tuexen wrote:
On 13. Mar 2018, at 07:43, Yingzhen Qu<yingzhen.ietf@gmail.com>=C2=A0 wrote:
Hi Michael,

Sorry for the late response.

Thanks for pointing out that we missed this important reference. You're= right, Quick-Start and our proposal do have lots of similarities, for exam= ple both of them require that end-points and routers to work together. But = they are also different in details. For example, in our proposal in-band si= gnaling proposal bandwidth is reserved on routers along the path.

In next version of this draft, We'll add discussions about RFC 4728 and= 6077.

BTW, can I request a slot to present this draft in TCPM if time allows?
How much time would you need?

Best regards
Michael
Thanks,
Yingzhen

On Mon, Mar 5, 2018 at 12:09 AM, Scharf, Michael (Nokia - DE/Stuttgart)<= michael.schar= f@nokia.com>=C2=A0 wrote:
I believe that this proposal is similar to QuickStart TCP (RFC 4782), which= is not cited in draft-han-tsvwg-cc, and the reference is also missing in d= raft-han-6man-in-band-signaling-for-transport-qos.



RFC 6077 explains some of the issues that an in-band signaling mechanism li= ke Quick-Start has to solve. As far as I can tell, the fundamental challeng= e is neither the protocol specification nor a prototype implementation. For= instance, it has been proven that QuickStart TCP can be implemented e.g. i= n network processors (see http://www.ikr.uni-stuttgart.de/Content/Publications/Archive/= Sf_Diss_40112.pdf).



So, when updating the documents, I suggest to add a discussion of how the o= pen research issues explained in RFC 6077 are addressed.



Michael





From: Yingzhen Qu [mailto:yingzhen.ietf@gmail.com]
Sent: Sunday, March 04, 2018 9:59 PM
To: gorry@erg.abd= n.ac.uk
Cc: Scharf, Michael (Nokia - DE/Stuttgart)<michael.scharf@nokia.com>; Tho= mas Nadeau<= tnadeau@lucidvision.com>; tcpm@ietf.org; Yingzhen Qu<yingzhen.qu@huawei.com>; tsvwg@ietf.org; tsvwg-chairs@ietf.org
Subject: Re: [tsvwg] Agenda requests for TSVWG@IETF101



Hi Gorry and Michael,



Thanks for the suggestion, I'll request a presentation in ICCRG. Meanwh= ile, I think since the in-band signaling draft was presented in TSVWG, if t= ime allows it still makes sense to present this draft in TSVWG.



The in-band signaling draft covers lots of aspects, and the required change= s include network layer and transport layer. We're working on updating = the draft, and may break it into pieces to fit different WGs.



Your comments and help are very much appreciated.



Thanks,

Yingzhen



On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst<gorry@erg.abdn.ac.uk>=C2=A0 w= rote:

I am unsure yet what the correct group of people world be to explore a &quo= t;Bandwidth Guaranteed Network". The presentation last IETF looked lik= e the work could imply a need for changes proposed to the network layer (us= ing OAM exchnages) to set the sending rate and make those bandwidth reserva= tions.=C2=A0 In the end, it could result in a protocol quite different to T= CP, I think this sort of change may possibly have a home in TSVWG=C2=A0 - b= ut first I'd agree with Michaeland would encourage a presentation of th= e problem statement in ICCRG to explore the issues.

Gorry

On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) wrote:


Hi all,

> From the abstract: =E2=80=9C=E2=80=A6This draft proposes a new TCP con= gestion control algorithm used in bandwidth guaranteed networks.=C2=A0 It i= s an extension to the current TCP standards.=E2=80=9D

In the IETF, I believe the expertise for this specific document would be in= TCPM, which in CC. If the authors are interested in feedback on the propos= ed mechanism, I would recommend to ask TCPM.

Alternatively, corresponding research could perhaps be performed in the ICC= RG. ICCRG has published RFC 6077 to document some of the open research issu= es in this space.

Michael

*From:*tsvwg [mailto:tsvwg-bounces@ietf.org] *On Behalf Of *Yingzhen Qu
*Sent:* Sunday, March 04, 2018 6:55 AM
*To:* tsvwg@ietf.org; tsvwg-chairs@= ietf.org
*Cc:* Thomas Nadeau<tnadeau@lucidvision.com>
*Subject:* [tsvwg] Agenda requests for TSVWG@IETF101

Dear Chairs,

A new draft (The draft was suggested by TSVWG @IETF100) was just submitted,= and we=E2=80=99d like to request a time slot to present it @IETF101.

Title:A New Congestion Control in Bandwidth Guaranteed Network

Presenter: Yingzhen Qu (Huawei)

Time required (including Q/A): 10 mins

Draft: https://datatracker.ietf.org/doc/dra= ft-han-tsvwg-cc/

If there is any question, please kindly let us know.

Thanks,

Yingzhen






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cnR4cmVmCjIwMDUwNQolJUVPRgo= --94eb2c043d8a21cfc1056755d98a-- From nobody Wed Mar 14 08:46:16 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 778951274D2; Wed, 14 Mar 2018 08:46:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.71 X-Spam-Level: X-Spam-Status: No, score=-0.71 tagged_above=-999 required=5 tests=[RCVD_IN_DNSWL_LOW=-0.7, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qzh3kQvApcDn; Wed, 14 Mar 2018 08:46:12 -0700 (PDT) Received: from drew.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D22F6127444; Wed, 14 Mar 2018 08:46:11 -0700 (PDT) Received: from [IPv6:2003:cd:6bea:8000:d1d5:5072:b19f:e041] (p200300CD6BEA8000D1D55072B19FE041.dip0.t-ipconnect.de [IPv6:2003:cd:6bea:8000:d1d5:5072:b19f:e041]) (Authenticated sender: lurchi) by mail-n.franken.de (Postfix) with ESMTPSA id C05CA721E280C; Wed, 14 Mar 2018 16:46:05 +0100 (CET) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) From: Michael Tuexen In-Reply-To: Date: Wed, 14 Mar 2018 16:46:04 +0100 Cc: Gorry Fairhurst , lin.han@huawei.com, "tcpm-chairs@ietf.org" , "tsvwg-chairs@ietf.org" Content-Transfer-Encoding: quoted-printable Message-Id: <27A735F9-FCB8-4859-8498-FD3BA5DDAF6F@lurchi.franken.de> References: <5A9BEB65.6010102@erg.abdn.ac.uk> <430A7C48-DA1D-4D73-AB40-F2B30A8E8580@lurchi.franken.de> <5AA7A614.3050706@erg.abdn.ac.uk> To: Yingzhen Qu X-Mailer: Apple Mail (2.3445.5.20) Archived-At: Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Mar 2018 15:46:15 -0000 > On 14. Mar 2018, at 03:08, Yingzhen Qu = wrote: >=20 > Hi chairs, >=20 > =20 > Sorry for all the confusions and troubles here. >=20 > =20 > We originally requested a slot in TSVWG considering the in-band = signaling draft was presented there at last IETF. Since we didn't = receive a confirmation and also noticed that TSVWG already has a full = schedule, hence sent a request to TCPM. So far, no request sent to ICCRG = yet. >=20 > =20 > We'd be happy to present it at either or both WGs. This congestion = control draft is a split of the in-band signaling draft per the comments = we received, and we plan to further split that draft based on comments = (potentially with one in Routing area focusing on ip signaling part). At = this IETF, we=E2=80=99ve requested to present the resource reservation = using in-band signaling in HotRFC lightning talk. >=20 > =20 > I=E2=80=99m also attaching the slides for the congestion control draft = presentation. Your comments are very much appreciated. >=20 > =20 > Title: A New Congestion Control in Bandwidth Guaranteed Network >=20 > Presenter: Yingzhen Qu (Huawei) >=20 > Time required (including Q/A): 10 mins >=20 > Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ Dear all, we can put this at the end of the agenda on TCPM, with a "if time = permits" label... Best regards Michael >=20 >=20 >=20 > Thanks, >=20 > Yingzhen >=20 >=20 > On Tue, Mar 13, 2018 at 3:21 AM, Gorry Fairhurst = wrote: > Hi Chairs... >=20 > I think we should coordinate:-) >=20 > The history I know is (please add). I think I'd benefit from more = thoughts by others. >=20 > There is work in ETSI by various companies on next generation = protocols. The work is diverse and most of it aims at significant = changes to IP. I spoke with some people (by no means all) who attend, = and they suggested at this time there was no consensus on what they = thought was the best direction. >=20 > We saw presentations on the overall architecture last IETF. There was = discussions in 6man, intarea, tsvwg, and possibly other places. I saw = significant push-back from others on the idea of introducing a new QoS = model, but what they proposed was complex and had not been discussed = much prior to the IETF meeting, so it may hard to understand by people. >=20 > A key question is whether this can work on a path that does not = include one specific vendor's equipment. What I understood was that it = relied on OAM information about the path. This phrase in the latest = draft seems to agree with what I think was presented last IETF: > "When a sender receives the third duplicated ACK, but no previous > OAM congestion alarm has been received, then it is considered = that > a segment is lost due to random failure not congestion. In this > case the cwnd is not changed." >=20 > As for TSVWG, we have had quite a long discussion with the authors at = the meeting and after. The TSV chairs encouraged them to take the CC = aspects separately and explain why this method is better and detail what = this benefit is and what is required in the router to allow this. We = suggested an initial talk in ICCRG to present results and show *why* = this is attractive. As far as I know they requested time to do this. >=20 > They also requested time in TSVWG - but there's (as yet) been little = discssion on the list, so we curently advise them to prepare a slide to = show to say why people should read the draft. We have not decided (yet) = to give time to this new framework. >=20 > They have now also requested time in TCPM. >=20 > I don't know whethere this time they are also requesting slots some = other places to discuss other aspects. >=20 > I also suggested (informally) that they should try making a great = short presentation of how this is a new opportunity and whar has changed = since we last saw schemes proposed. I do see that there are significant = advances in router forwarding hardware - and I suspect there could be = similar ideas in cisco, etc.Would other vendors (or operators) be = interested in standardising this? I think such a talk could be put to = TSVAREA. >=20 > Gorry >=20 >=20 > On 13/03/2018, 09:45, Michael Tuexen wrote: > On 13. Mar 2018, at 07:43, Yingzhen Qu = wrote: >=20 > Hi Michael, >=20 > Sorry for the late response. >=20 > Thanks for pointing out that we missed this important reference. = You're right, Quick-Start and our proposal do have lots of similarities, = for example both of them require that end-points and routers to work = together. But they are also different in details. For example, in our = proposal in-band signaling proposal bandwidth is reserved on routers = along the path. >=20 > In next version of this draft, We'll add discussions about RFC 4728 = and 6077. >=20 > BTW, can I request a slot to present this draft in TCPM if time = allows? > How much time would you need? >=20 > Best regards > Michael > Thanks, > Yingzhen >=20 > On Mon, Mar 5, 2018 at 12:09 AM, Scharf, Michael (Nokia - = DE/Stuttgart) wrote: > I believe that this proposal is similar to QuickStart TCP (RFC 4782), = which is not cited in draft-han-tsvwg-cc, and the reference is also = missing in draft-han-6man-in-band-signaling-for-transport-qos. >=20 >=20 >=20 > RFC 6077 explains some of the issues that an in-band signaling = mechanism like Quick-Start has to solve. As far as I can tell, the = fundamental challenge is neither the protocol specification nor a = prototype implementation. For instance, it has been proven that = QuickStart TCP can be implemented e.g. in network processors (see = http://www.ikr.uni-stuttgart.de/Content/Publications/Archive/Sf_Diss_40112= .pdf). >=20 >=20 >=20 > So, when updating the documents, I suggest to add a discussion of how = the open research issues explained in RFC 6077 are addressed. >=20 >=20 >=20 > Michael >=20 >=20 >=20 >=20 >=20 > From: Yingzhen Qu [mailto:yingzhen.ietf@gmail.com] > Sent: Sunday, March 04, 2018 9:59 PM > To: gorry@erg.abdn.ac.uk > Cc: Scharf, Michael (Nokia - DE/Stuttgart); = Thomas Nadeau; tcpm@ietf.org; Yingzhen = Qu; tsvwg@ietf.org; tsvwg-chairs@ietf.org > Subject: Re: [tsvwg] Agenda requests for TSVWG@IETF101 >=20 >=20 >=20 > Hi Gorry and Michael, >=20 >=20 >=20 > Thanks for the suggestion, I'll request a presentation in ICCRG. = Meanwhile, I think since the in-band signaling draft was presented in = TSVWG, if time allows it still makes sense to present this draft in = TSVWG. >=20 >=20 >=20 > The in-band signaling draft covers lots of aspects, and the required = changes include network layer and transport layer. We're working on = updating the draft, and may break it into pieces to fit different WGs. >=20 >=20 >=20 > Your comments and help are very much appreciated. >=20 >=20 >=20 > Thanks, >=20 > Yingzhen >=20 >=20 >=20 > On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst = wrote: >=20 > I am unsure yet what the correct group of people world be to explore a = "Bandwidth Guaranteed Network". The presentation last IETF looked like = the work could imply a need for changes proposed to the network layer = (using OAM exchnages) to set the sending rate and make those bandwidth = reservations. In the end, it could result in a protocol quite different = to TCP, I think this sort of change may possibly have a home in TSVWG - = but first I'd agree with Michaeland would encourage a presentation of = the problem statement in ICCRG to explore the issues. >=20 > Gorry >=20 > On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) wrote: >=20 >=20 > Hi all, >=20 > > =46rom the abstract: =E2=80=9C=E2=80=A6This draft proposes a new TCP = congestion control algorithm used in bandwidth guaranteed networks. It = is an extension to the current TCP standards.=E2=80=9D >=20 > In the IETF, I believe the expertise for this specific document would = be in TCPM, which in CC. If the authors are interested in feedback on = the proposed mechanism, I would recommend to ask TCPM. >=20 > Alternatively, corresponding research could perhaps be performed in = the ICCRG. ICCRG has published RFC 6077 to document some of the open = research issues in this space. >=20 > Michael >=20 > *From:*tsvwg [mailto:tsvwg-bounces@ietf.org] *On Behalf Of *Yingzhen = Qu > *Sent:* Sunday, March 04, 2018 6:55 AM > *To:* tsvwg@ietf.org; tsvwg-chairs@ietf.org > *Cc:* Thomas Nadeau > *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 >=20 > Dear Chairs, >=20 > A new draft (The draft was suggested by TSVWG @IETF100) was just = submitted, and we=E2=80=99d like to request a time slot to present it = @IETF101. >=20 > Title:A New Congestion Control in Bandwidth Guaranteed Network >=20 > Presenter: Yingzhen Qu (Huawei) >=20 > Time required (including Q/A): 10 mins >=20 > Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ >=20 > If there is any question, please kindly let us know. >=20 > Thanks, >=20 > Yingzhen >=20 >=20 >=20 >=20 >=20 >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm From nobody Wed Mar 14 09:42:02 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7E66512D77B for ; 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Wed, 14 Mar 2018 09:41:56 -0700 (PDT) MIME-Version: 1.0 Received: by 10.159.37.196 with HTTP; Wed, 14 Mar 2018 09:41:55 -0700 (PDT) In-Reply-To: <5A9BEB65.6010102@erg.abdn.ac.uk> References: <5A9BEB65.6010102@erg.abdn.ac.uk> From: Pat Thaler Date: Wed, 14 Mar 2018 09:41:55 -0700 Message-ID: To: Gorry Fairhurst Cc: "Scharf, Michael (Nokia - DE/Stuttgart)" , Thomas Nadeau , "tcpm@ietf.org" , Yingzhen Qu , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" , DetNet Chairs Content-Type: multipart/alternative; boundary="001a1145762299574e0567620d53" Archived-At: Subject: Re: [tcpm] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Mar 2018 16:42:00 -0000 --001a1145762299574e0567620d53 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable There work underway in detnet WG in the routing area for " point-to-point (unicast) and point-to-multipoint (multicast) flows which can be characterized in a manner that allows the network to 1) reserve the appropriate resources for the flows in advance, and 2) release/reuse the resources when they are no longer required." The purpose is to provide for bounded latency, loss and delay variation along with high reliability. The current charter is focused on defining the data plane aspects. I hope that that will be followed by work to define the control plane. I've only had a quick glance at the draft. It isn't clear to me that it would be compatible with a network providing reservations for guaranteed bandwidth because it allows for sending at a rate higher than the bandwidth guarantee; (i.e. a peak rate higher than the committed rate). If flows are allowed to consume more than their reserved resources, they may interfere with the resources committed to other flows. Pat On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst wrote: > I am unsure yet what the correct group of people world be to explore a > "Bandwidth Guaranteed Network". The presentation last IETF looked like th= e > work could imply a need for changes proposed to the network layer (using > OAM exchnages) to set the sending rate and make those bandwidth > reservations. In the end, it could result in a protocol quite different = to > TCP, I think this sort of change may possibly have a home in TSVWG - but > first I'd agree with Michaeland would encourage a presentation of the > problem statement in ICCRG to explore the issues. > > Gorry > > On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) wrote: > >> >> Hi all, >> >> From the abstract: =E2=80=9C=E2=80=A6This draft proposes a new TCP conge= stion control >> algorithm used in bandwidth guaranteed networks. It is an extension to = the >> current TCP standards.=E2=80=9D >> >> In the IETF, I believe the expertise for this specific document would be >> in TCPM, which in CC. If the authors are interested in feedback on the >> proposed mechanism, I would recommend to ask TCPM. >> >> Alternatively, corresponding research could perhaps be performed in the >> ICCRG. ICCRG has published RFC 6077 to document some of the open researc= h >> issues in this space. >> >> Michael >> >> *From:*tsvwg [mailto:tsvwg-bounces@ietf.org] *On Behalf Of *Yingzhen Qu >> *Sent:* Sunday, March 04, 2018 6:55 AM >> *To:* tsvwg@ietf.org; tsvwg-chairs@ietf.org >> *Cc:* Thomas Nadeau >> *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 >> >> Dear Chairs, >> >> A new draft (The draft was suggested by TSVWG @IETF100) was just >> submitted, and we=E2=80=99d like to request a time slot to present it @I= ETF101. >> >> Title:A New Congestion Control in Bandwidth Guaranteed Network >> >> Presenter: Yingzhen Qu (Huawei) >> >> Time required (including Q/A): 10 mins >> >> Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ >> >> If there is any question, please kindly let us know. >> >> Thanks, >> >> Yingzhen >> >> > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm > --001a1145762299574e0567620d53 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
There work underway in detnet WG in the routing area for= =C2=A0" point-to-point (unicast) and point-to-multipoint (multicast) f= lows which can be characterized in a manner that allows the network to 1) r= eserve the appropriate resources for the flows in advance, and 2) release/r= euse the resources when they are no longer required."=C2=A0 The purpos= e is to provide for bounded latency, loss and delay variation along with hi= gh reliability. The current charter is focused on defining the data plane a= spects. I hope that that will be followed by work to define the control pla= ne.

I've only had a quick glance at the draft. It is= n't clear to me that it would be compatible with a network providing re= servations for guaranteed bandwidth because it allows for sending at a rate= higher than the bandwidth guarantee; (i.e. a peak rate higher than the com= mitted rate). If flows are allowed to consume more than their reserved reso= urces, they may interfere with the resources committed to other flows.=C2= =A0

Pat

<= div class=3D"gmail_quote">On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst <= span dir=3D"ltr"><gorry@erg.abdn.ac.uk> wrote:
I am unsure yet what the correct group of people world be to explore = a "Bandwidth Guaranteed Network". The presentation last IETF look= ed like the work could imply a need for changes proposed to the network lay= er (using OAM exchnages) to set the sending rate and make those bandwidth r= eservations.=C2=A0 In the end, it could result in a protocol quite differen= t to TCP, I think this sort of change may possibly have a home in TSVWG=C2= =A0 - but first I'd agree with Michaeland would encourage a presentatio= n of the problem statement in ICCRG to explore the issues.

Gorry

On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) wrote:

Hi all,

>From the abstract: =E2=80=9C=E2=80=A6This draft proposes a new TCP congesti= on control algorithm used in bandwidth guaranteed networks.=C2=A0 It is an = extension to the current TCP standards.=E2=80=9D

In the IETF, I believe the expertise for this specific document would be in= TCPM, which in CC. If the authors are interested in feedback on the propos= ed mechanism, I would recommend to ask TCPM.

Alternatively, corresponding research could perhaps be performed in the ICC= RG. ICCRG has published RFC 6077 to document some of the open research issu= es in this space.

Michael

 *From:*tsvwg [mailto:tsvwg-bounces@ietf.org] *On Behalf Of *Yingzhen Qu
*Sent:* Sunday, March 04, 2018 6:55 AM
*To:* tsvwg@ietf.org; tsvwg-chairs@= ietf.org
*Cc:* Thomas Nadeau <tnadeau@lucidvision.com>
*Subject:* [tsvwg] Agenda requests for TSVWG@IETF101

Dear Chairs,

A new draft (The draft was suggested by TSVWG @IETF100) was just submitted,= and we=E2=80=99d like to request a time slot to present it @IETF101.

Title:A New Congestion Control in Bandwidth Guaranteed Network

Presenter: Yingzhen Qu (Huawei)

Time required (including Q/A): 10 mins

Draft: https://datatracker.ietf.org/doc/dra= ft-han-tsvwg-cc/

If there is any question, please kindly let us know.

Thanks,

Yingzhen


_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm

--001a1145762299574e0567620d53-- From nobody Wed Mar 14 12:03:33 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1CFBC126C26; Wed, 14 Mar 2018 12:03:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.33 X-Spam-Level: X-Spam-Status: No, score=-2.33 tagged_above=-999 required=5 tests=[HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LViyjZQwzUc4; Wed, 14 Mar 2018 12:03:28 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1B80B126B72; Wed, 14 Mar 2018 12:03:28 -0700 (PDT) Received: from lhreml709-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id 23AC9529744C8; Wed, 14 Mar 2018 19:03:24 +0000 (GMT) Received: from SJCEML701-CHM.china.huawei.com (10.208.112.40) by lhreml709-cah.china.huawei.com (10.201.108.32) with Microsoft SMTP Server (TLS) id 14.3.382.0; Wed, 14 Mar 2018 19:03:25 +0000 Received: from SJCEML521-MBS.china.huawei.com ([169.254.2.168]) by SJCEML701-CHM.china.huawei.com ([169.254.3.93]) with mapi id 14.03.0382.000; Wed, 14 Mar 2018 12:03:15 -0700 From: Yingzhen Qu To: Pat Thaler , Gorry Fairhurst CC: "Scharf, Michael (Nokia - DE/Stuttgart)" , Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" , DetNet Chairs Thread-Topic: [tcpm] Agenda requests for TSVWG@IETF101 Thread-Index: AQHTs31He8dVfiO+dEamE9tKlKhCoqO/3CkggACxfoCAD+dwgIAAJ3wA Date: Wed, 14 Mar 2018 19:03:15 +0000 Message-ID: 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+1300 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <1DA14EFC-86A3-4EC4-B583-0FA7AFDAD751@huawei.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Mar 2018 19:38:48 -0000 Pat, > If flows are allowed to consume more than their reserved resources, the= y may interfere with the resources committed to other flows. No. They will simply use resources that are otherwise available for the b= est effort (or lower effort) class. Clearly, the total of all CIRs must b= e less than the total capacity, on any given path. Bounded latency and jitter are definitely harder problems. I think it mig= ht be wise to wait until DETNET has made some progress before fixing the = signalling parameters. There's no point in signalling a request that is p= hysically impossible to satisfy. So Yingzhen is correct to say "TBD" belo= w. Regards Brian Carpenter On 15/03/2018 08:03, Yingzhen Qu wrote: > Hi Pat, >=20 > Thanks for the comments. >=20 > Exactly what the QoS parameters to be used is TBD. In the draft, we def= ined a minimum set such as PIR/CIR/BS/latency, so hardware programming ma= y use one or more parameters depending on the feature requirement. For ex= ample, for bandwidth sensitive application, customer can give PIR/CIR (ev= en you can have PIR=3DCIR, it means device only guarantees the forwarding= of the traffic less than CIR); for latency sensitive application, we can= have CIR and/or bounded latency for the traffic like CBR in TSN. >=20 > Thanks, > Yingzhen >=20 > From: Pat Thaler > Date: Wednesday, March 14, 2018 at 9:42 AM > To: Gorry Fairhurst > Cc: "Scharf, Michael (Nokia - DE/Stuttgart)" = , Thomas Nadeau , "tcpm@ietf.org" , Yingzhen Qu , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" , DetNet Chairs > Subject: Re: [tcpm] Agenda requests for TSVWG@IETF101 >=20 > There work underway in detnet WG in the routing area for " point-to-poi= nt (unicast) and point-to-multipoint (multicast) flows which can be chara= cterized in a manner that allows the network to 1) reserve the appropriat= e resources for the flows in advance, and 2) release/reuse the resources = when they are no longer required." The purpose is to provide for bounded= latency, loss and delay variation along with high reliability. The curre= nt charter is focused on defining the data plane aspects. I hope that tha= t will be followed by work to define the control plane. >=20 > I've only had a quick glance at the draft. It isn't clear to me that it= would be compatible with a network providing reservations for guaranteed= bandwidth because it allows for sending at a rate higher than the bandwi= dth guarantee; (i.e. a peak rate higher than the committed rate). If flow= s are allowed to consume more than their reserved resources, they may int= erfere with the resources committed to other flows. >=20 > Pat >=20 > On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst > wrote: > I am unsure yet what the correct group of people world be to explore a = "Bandwidth Guaranteed Network". The presentation last IETF looked like th= e work could imply a need for changes proposed to the network layer (usin= g OAM exchnages) to set the sending rate and make those bandwidth reserva= tions. In the end, it could result in a protocol quite different to TCP,= I think this sort of change may possibly have a home in TSVWG - but fir= st I'd agree with Michaeland would encourage a presentation of the proble= m statement in ICCRG to explore the issues. >=20 > Gorry >=20 > On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) wrote: >=20 > Hi all, >=20 > From the abstract: =E2=80=9C=E2=80=A6This draft proposes a new TCP cong= estion control algorithm used in bandwidth guaranteed networks. It is an= extension to the current TCP standards.=E2=80=9D >=20 > In the IETF, I believe the expertise for this specific document would b= e in TCPM, which in CC. If the authors are interested in feedback on the = proposed mechanism, I would recommend to ask TCPM. >=20 > Alternatively, corresponding research could perhaps be performed in the= ICCRG. ICCRG has published RFC 6077 to document some of the open researc= h issues in this space. >=20 > Michael >=20 > *From:*tsvwg [mailto:tsvwg-bounces@ietf.org] *On Behalf Of *Yingzhen Qu > *Sent:* Sunday, March 04, 2018 6:55 AM > *To:* tsvwg@ietf.org; tsvwg-chairs@ietf.org > *Cc:* Thomas Nadeau > > *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 >=20 > Dear Chairs, >=20 > A new draft (The draft was suggested by TSVWG @IETF100) was just submit= ted, and we=E2=80=99d like to request a time slot to present it @IETF101.= >=20 > Title:A New Congestion Control in Bandwidth Guaranteed Network >=20 > Presenter: Yingzhen Qu (Huawei) >=20 > Time required (including Q/A): 10 mins >=20 > Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ >=20 > If there is any question, please kindly let us know. >=20 > Thanks, >=20 > Yingzhen >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm >=20 From nobody Wed Mar 14 14:22:17 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2450F127978; Wed, 14 Mar 2018 14:21:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.231 X-Spam-Level: X-Spam-Status: No, score=-4.231 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id t64Edd8uaGQ3; Wed, 14 Mar 2018 14:21:56 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 40860126CE8; Wed, 14 Mar 2018 14:21:56 -0700 (PDT) Received: from LHREML712-CAH.china.huawei.com (unknown [172.18.7.106]) by Forcepoint Email with ESMTP id 83CF85A23A6D5; Wed, 14 Mar 2018 21:21:51 +0000 (GMT) Received: from SJCEML701-CHM.china.huawei.com (10.208.112.40) by LHREML712-CAH.china.huawei.com (10.201.108.35) with Microsoft SMTP Server (TLS) id 14.3.382.0; Wed, 14 Mar 2018 21:21:53 +0000 Received: from SJCEML521-MBS.china.huawei.com ([169.254.2.168]) by SJCEML701-CHM.china.huawei.com ([169.254.3.93]) with mapi id 14.03.0382.000; Wed, 14 Mar 2018 14:21:49 -0700 From: Lin Han To: Ingemar Johansson S , "tte@cs.fau.de" CC: "tcpm@ietf.org" , "tsvwg@ietf.org" , "'iccrg@irtf.org'" Thread-Topic: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) Thread-Index: AdO7ZqLf99MPKZX+ToKs31yM2w2JXQAb219w Date: Wed, 14 Mar 2018 21:21:49 +0000 Message-ID: <1D30AF33624CDD4A99E8C395069A2A162CDBB467@sjceml521-mbs.china.huawei.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.209.216.200] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Mar 2018 21:21:59 -0000 Hi, Ingemar Tanks for the comments, See inline answer Best Regards Lin -----Original Message----- From: Ingemar Johansson S [mailto:ingemar.s.johansson@ericsson.com]=20 Sent: Wednesday, March 14, 2018 12:56 AM To: Lin Han ; tte@cs.fau.de Cc: tcpm@ietf.org; tsvwg@ietf.org; 'iccrg@irtf.org' ; Ingem= ar Johansson S Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for = TSVWG@IETF101) Hi This subject pops up every once in a while.=20 [LH] You are right -:) But this time, we bring up this issue for the future= applications like AR/VR, not for applications that current TCP works well.= See the detailed analysis in draft-han-iccrg-arvr-transport-problem-00. We= believe for the applications, such as AR/VR/TSN, that are much sensitive t= o congestion or delay, current technologies are hard to satisfy the require= ment.=20 I would like to add my perspective, given how I understand that 3GPP techno= logy works. The 3GPP QoS framework can be used to offer for instance a Guar= anteed bandwidth (GBR) to applications. The operation is that the "bearer" = gets increased scheduling priority once the throughput is below the GBR val= ue. In simulations I have verified that this framework can deliver a GBR to TCP= flows when the network load increases, at least as long it is possible to = push back other bearers with a lower priority. So, seen from my experience = so far I am not fully confident that additional inband signaling is needed.= =20 [LH] Does it work well when the GW or eNodeB are congested? The purpose for= in-band signaling is to guarantee network resource for a critical applicat= ion no matter what happens. The congestion is the major problem for such re= quirement by current technology, because all flows can only share the bandw= idth during congestion. There can however be a benefit to e.g. determine an appropriate bitrate for= a DASH session, depending on network load and/or coverage, but I would arg= ue that out of band signaling is better in this case. [LH] One benefit of in-band signaling is it can provide the dynamic resourc= e (like Q depth) to the source. By using this signal, we can distinguish co= ngestion packet loss and random physical loss. It can increase the good-put= for application as we described in the new draft. As regards to "worst case latency", I am not sure that I follow here, are w= e discussing TSN/Detnet technology here, general link failures, or is it ab= out means to control the queue delay in the network ?. As to the latter, I = believe that it is worthwhile to look more closely at L4S.=20 [LH] Yes, we want to control the delay for specified flow by change the que= ue/scheduler parameters. We believe only through such very fine control, we= can achieve the expected service from application. We are in talk with det= net to see if they want an alternative solution other than PWE. L4S still o= nly provides a statistical bounded latency when all hosts are upgraded to s= upport L4S. For our solution, we don't need to change hosts if they don't w= ant to use new TCP. Regards Ingemar Johansson > Message: 2 > Date: Tue, 13 Mar 2018 19:27:18 +0000 > From: Lin Han > To: Toerless Eckert , Gorry Fairhurst > > Cc: Thomas Nadeau , "tcpm@ietf.org" > , "tsvwg@ietf.org" , "Scharf, Michael > (Nokia - DE/Stuttgart)" , > "tsvwg-chairs@ietf.org" , Katsushi Kobayashi > , Yingzhen Qu > Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests > for TSVWG@IETF101) > Message-ID: > <1D30AF33624CDD4A99E8C395069A2A162CDB9BA3@sjceml521- > mbs.china.huawei.com> >=20 > Content-Type: text/plain; charset=3D"us-ascii" >=20 > Hi, Gorry/Toerless >=20 > Here is some explanation and clarification for two drafts=20 > (draft-han-tsvwg-cc and=20 > draft-han-6man-in-band-signaling-for-transport-qos) >=20 > 1. About draft-han-tsvwg-cc compared with other CC for bandwidth=20 > guaranteed network, such as gTFRC. > draft-han-tsvwg-cc is a split draft from=20 > draft-han-6man-in-band-signaling-for- > transport-qos . It proposes a new CC for a network if the TCP=20 > session's bandwidth is guaranteed. Here the guaranteed bandwidth is=20 > per TCP session and described by PIR/CIR and given directly by TCP end us= er. >=20 > 2. About TCP-QS and draft-han-6man-in-band-signaling-for-transport-qos > >From my understanding, TCP-QS and=20 > >draft-han-6man-in-band-signaling-for- > transport-qos do have similarity, both are kind of using in-band=20 > signaling for the resource reservation. But they still have big differenc= e. > 1). draft-han-6man-in-band-signaling-for-transport-qos is more general=20 > in- band signaling method, it not only applies to TCP, but also UDP or=20 > other upper layer of protocol, even the draft only exemplifies the method= to TCP. > 2). draft-han-6man-in-band-signaling-for-transport-qos provides=20 > reserved resource for bandwidth and latency for the whole life of TCP=20 > session. It gives more flavors and more granularity for the QoS=20 > (unlike TCP-QS only has 16 values of starting bandwidth). Moreover, it=20 > can support the "worst case latency" at each hop; also, it can support=20 > the OAM to detect the congestion states, and support the "forwarding=20 > state" for host to be notified in real-time about if the resource=20 > reservation or QoS forwarding is interrupted by abnormal situation such a= s link/node failures. >=20 > Best regards >=20 > Lin >=20 From nobody Wed Mar 14 16:32:27 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9956E126FDC; Wed, 14 Mar 2018 16:32:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.961 X-Spam-Level: X-Spam-Status: No, score=-3.961 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Oa8fgdgL543J; Wed, 14 Mar 2018 16:32:17 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5520F126CD6; Wed, 14 Mar 2018 16:32:17 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 12FF858C4BA; Thu, 15 Mar 2018 00:32:12 +0100 (CET) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id ED8B3B0DD1F; Thu, 15 Mar 2018 00:32:11 +0100 (CET) Date: Thu, 15 Mar 2018 00:32:11 +0100 From: Toerless Eckert To: Pat Thaler Cc: Gorry Fairhurst , Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "Scharf, Michael (Nokia - DE/Stuttgart)" , "tsvwg-chairs@ietf.org" , DetNet Chairs , Yingzhen Qu Message-ID: <20180314233211.GA11615@faui40p.informatik.uni-erlangen.de> References: <5A9BEB65.6010102@erg.abdn.ac.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: Re: [tcpm] [tsvwg] Agenda requests for TSVWG@IETF101 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Mar 2018 23:32:20 -0000 Thanks, Pat - inline. On Wed, Mar 14, 2018 at 09:41:55AM -0700, Pat Thaler wrote: > There work underway in detnet WG in the routing area for " point-to-point > (unicast) and point-to-multipoint (multicast) flows which can be > characterized in a manner that allows the network to 1) reserve the > appropriate resources for the flows in advance, and 2) release/reuse the > resources when they are no longer required." The purpose is to provide for > bounded latency, loss and delay variation along with high reliability. The > current charter is focused on defining the data plane aspects. Yes, well aware of that. We will also propose he inband signalling fr that context. The draft already mentions in passing UDP and is really not difficult to adopt to any transport. TCP was just the most widely accepted protocol even with more challenges than UDP IMHO, thats why our inband signaling draft focusses on it. > I hope that that will be followed by work to define the control plane. +1. > I've only had a quick glance at the draft. It isn't clear to me that it > would be compatible with a network providing reservations for guaranteed > bandwidth because it allows for sending at a rate higher than the bandwidth > guarantee; (i.e. a peak rate higher than the committed rate). If flows are > allowed to consume more than their reserved resources, they may interfere > with the resources committed to other flows. The enforcement of not intruding on reserved capacity is a matter of the forwarding plane. In the most extreme case which we describe in our inband singaling, you use per-flow reservation state (shaper/scheduler). This can be optimized(cost reduced) by only doing per-flow state on the edge and only admission control (calculate/signal inband) hop-by-hop, but not establish per-flow packet processing state (shaper/scheduler). This is all exactly like IMHO it would need to work in DetNet (e.g.: forwarding plane. Signaling is obviously variable... inband signaling is just the best IMHO ;-)). The interesting part of course is that your overall latency and jitter will go down the drain once you exceed your per-flow shaper/scheduler CIR + burst size and start to compete based on congestion experience. For the not really 'realtim' apps like he typical streaming with guaranteed CIR requiremens but desire for upspeeding, this is a perfect compromise to strike. For the typical realtime app coming from a CBR world, thats a surprise that might want them to stick to just CBR = CIR = PIR requests. The more advanced video solutions btw would use the AF style forwarding approach, whereby your <= CIR rate is marked with a hghier priority AF code point and the CIR..PIR rate with a lower AF code point. And then you put the more important video frames into your higher AF code point/ <= CIR rate, and the less important frames into the lower priority and you get even better upspeeding experience (visually). This btw. is something requiring UDP or SCTP or the like. TCP apps have no control over message/packet boundaries to mark them accordingly. Wrt. DetNet: I wam not quite sure about the PHBs defined in TSN. I sometime have the fear that its a lot more limited than in IP. I hope we manage to leverage the full extend of IP QoS in DetNet and not only some L2 TSN QoS subset... Toerless > Pat > > On Sun, Mar 4, 2018 at 4:49 AM, Gorry Fairhurst > wrote: > > > I am unsure yet what the correct group of people world be to explore a > > "Bandwidth Guaranteed Network". The presentation last IETF looked like the > > work could imply a need for changes proposed to the network layer (using > > OAM exchnages) to set the sending rate and make those bandwidth > > reservations. In the end, it could result in a protocol quite different to > > TCP, I think this sort of change may possibly have a home in TSVWG - but > > first I'd agree with Michaeland would encourage a presentation of the > > problem statement in ICCRG to explore the issues. > > > > Gorry > > > > On 04/03/2018, 10:34, Scharf, Michael (Nokia - DE/Stuttgart) wrote: > > > >> > >> Hi all, > >> > >> From the abstract: ??????This draft proposes a new TCP congestion control > >> algorithm used in bandwidth guaranteed networks. It is an extension to the > >> current TCP standards.??? > >> > >> In the IETF, I believe the expertise for this specific document would be > >> in TCPM, which in CC. If the authors are interested in feedback on the > >> proposed mechanism, I would recommend to ask TCPM. > >> > >> Alternatively, corresponding research could perhaps be performed in the > >> ICCRG. ICCRG has published RFC 6077 to document some of the open research > >> issues in this space. > >> > >> Michael > >> > >> *From:*tsvwg [mailto:tsvwg-bounces@ietf.org] *On Behalf Of *Yingzhen Qu > >> *Sent:* Sunday, March 04, 2018 6:55 AM > >> *To:* tsvwg@ietf.org; tsvwg-chairs@ietf.org > >> *Cc:* Thomas Nadeau > >> *Subject:* [tsvwg] Agenda requests for TSVWG@IETF101 > >> > >> Dear Chairs, > >> > >> A new draft (The draft was suggested by TSVWG @IETF100) was just > >> submitted, and we???d like to request a time slot to present it @IETF101. > >> > >> Title:A New Congestion Control in Bandwidth Guaranteed Network > >> > >> Presenter: Yingzhen Qu (Huawei) > >> > >> Time required (including Q/A): 10 mins > >> > >> Draft: https://datatracker.ietf.org/doc/draft-han-tsvwg-cc/ > >> > >> If there is any question, please kindly let us know. > >> > >> Thanks, > >> > >> Yingzhen > >> > >> > > _______________________________________________ > > tcpm mailing list > > tcpm@ietf.org > > https://www.ietf.org/mailman/listinfo/tcpm > > -- --- tte@cs.fau.de From nobody Thu Mar 15 01:24:03 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BDBCB12D95F for ; 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> tte@cs.fau.de > Cc: tcpm@ietf.org; tsvwg@ietf.org; 'iccrg@irtf.org' > Subject: RE: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests fo= r > TSVWG@IETF101) >=20 > Hi, Ingemar >=20 > Tanks for the comments, See inline answer >=20 > Best Regards >=20 > Lin >=20 > -----Original Message----- > From: Ingemar Johansson S [mailto:ingemar.s.johansson@ericsson.com] > Sent: Wednesday, March 14, 2018 12:56 AM > To: Lin Han ; tte@cs.fau.de > Cc: tcpm@ietf.org; tsvwg@ietf.org; 'iccrg@irtf.org' ; Ing= emar > Johansson S > Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests fo= r > TSVWG@IETF101) >=20 > Hi >=20 > This subject pops up every once in a while. > [LH] You are right -:) But this time, we bring up this issue for the futu= re > applications like AR/VR, not for applications that current TCP works well= . See > the detailed analysis in draft-han-iccrg-arvr-transport-problem-00. We > believe for the applications, such as AR/VR/TSN, that are much sensitive = to > congestion or delay, current technologies are hard to satisfy the > requirement. [IJ] Please have a look at the RITE project experiments https://riteproject= .eu/, these show that you can achieve very short latency with L4S technolog= y, L4S can in many ways coexist with diffserv and this draft outlines how t= he two can work together https://tools.ietf.org/pdf/draft-briscoe-tsvwg-l4s= -diffserv-00.pdf . Given this I am not convinced why an inband QoS solution= is needed for AR/VR. >=20 > I would like to add my perspective, given how I understand that 3GPP > technology works. The 3GPP QoS framework can be used to offer for > instance a Guaranteed bandwidth (GBR) to applications. The operation is t= hat > the "bearer" gets increased scheduling priority once the throughput is be= low > the GBR value. > In simulations I have verified that this framework can deliver a GBR to T= CP > flows when the network load increases, at least as long it is possible to= push > back other bearers with a lower priority. So, seen from my experience so = far I > am not fully confident that additional inband signaling is needed. > [LH] Does it work well when the GW or eNodeB are congested? The purpose > for in-band signaling is to guarantee network resource for a critical app= lication > no matter what happens. The congestion is the major problem for such > requirement by current technology, because all flows can only share the > bandwidth during congestion. [IJ] As for eNB, the allocation of GBR/MBR comes with admission control. Ho= wever because of physical limitations in terms of limited power coverage an= d/or radio interference, no in-band or out of band QoS signaling in the wor= ld can guarantee a given throughput in all conditions. It is all matter of = prioritization of the available resource blocks, where each resources worth= in terms of bits is dictated by the laws of Shannon, somewhat on steroids = with the use of adaptive antenna beamforming.=20 >=20 > There can however be a benefit to e.g. determine an appropriate bitrate f= or > a DASH session, depending on network load and/or coverage, but I would > argue that out of band signaling is better in this case. > [LH] One benefit of in-band signaling is it can provide the dynamic resou= rce > (like Q depth) to the source. By using this signal, we can distinguish > congestion packet loss and random physical loss. It can increase the good= -put > for application as we described in the new draft. [IJ] But isn't it better to use good AQMs instead as the goal should always= be to avoid large standing queues ?.=20 >=20 > As regards to "worst case latency", I am not sure that I follow here, are= we > discussing TSN/Detnet technology here, general link failures, or is it ab= out > means to control the queue delay in the network ?. As to the latter, I be= lieve > that it is worthwhile to look more closely at L4S. > [LH] Yes, we want to control the delay for specified flow by change the > queue/scheduler parameters. We believe only through such very fine > control, we can achieve the expected service from application. We are in = talk > with detnet to see if they want an alternative solution other than PWE. L= 4S > still only provides a statistical bounded latency when all hosts are upgr= aded > to support L4S. For our solution, we don't need to change hosts if they d= on't > want to use new TCP. [IJ] The L4S issue is that of deployment but you will face similar deployme= nt issues with inband QoS signaling, probably worse. L4S is basically very = simple technology whereas inband QoS implies more packet inspection and pro= cessing.=20 And I believe that TSN/Detnet is a different story as it tries to achieve e= xtremely tight scheduling, so far in confined domains. >=20 > Regards > Ingemar Johansson >=20 >=20 > > Message: 2 > > Date: Tue, 13 Mar 2018 19:27:18 +0000 > > From: Lin Han > > To: Toerless Eckert , Gorry Fairhurst > > > > Cc: Thomas Nadeau , "tcpm@ietf.org" > > , "tsvwg@ietf.org" , "Scharf, > Michael > > (Nokia - DE/Stuttgart)" , > > "tsvwg-chairs@ietf.org" , Katsushi Kobayashi > > , Yingzhen Qu > > Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests > > for TSVWG@IETF101) > > Message-ID: > > <1D30AF33624CDD4A99E8C395069A2A162CDB9BA3@sjceml521- > > mbs.china.huawei.com> > > > > Content-Type: text/plain; charset=3D"us-ascii" > > > > Hi, Gorry/Toerless > > > > Here is some explanation and clarification for two drafts > > (draft-han-tsvwg-cc and > > draft-han-6man-in-band-signaling-for-transport-qos) > > > > 1. About draft-han-tsvwg-cc compared with other CC for bandwidth > > guaranteed network, such as gTFRC. > > draft-han-tsvwg-cc is a split draft from > > draft-han-6man-in-band-signaling-for- > > transport-qos . It proposes a new CC for a network if the TCP > > session's bandwidth is guaranteed. Here the guaranteed bandwidth is > > per TCP session and described by PIR/CIR and given directly by TCP end > user. > > > > 2. About TCP-QS and draft-han-6man-in-band-signaling-for-transport-qos > > >From my understanding, TCP-QS and > > >draft-han-6man-in-band-signaling-for- > > transport-qos do have similarity, both are kind of using in-band > > signaling for the resource reservation. But they still have big differe= nce. > > 1). draft-han-6man-in-band-signaling-for-transport-qos is more general > > in- band signaling method, it not only applies to TCP, but also UDP or > > other upper layer of protocol, even the draft only exemplifies the meth= od > to TCP. > > 2). draft-han-6man-in-band-signaling-for-transport-qos provides > > reserved resource for bandwidth and latency for the whole life of TCP > > session. It gives more flavors and more granularity for the QoS > > (unlike TCP-QS only has 16 values of starting bandwidth). Moreover, it > > can support the "worst case latency" at each hop; also, it can support > > the OAM to detect the congestion states, and support the "forwarding > > state" for host to be notified in real-time about if the resource > > reservation or QoS forwarding is interrupted by abnormal situation such= as > link/node failures. > > > > Best regards > > > > Lin > > From nobody Thu Mar 15 12:56:24 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B3849126B72; Thu, 15 Mar 2018 12:56:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6EALoRQmLdwm; Thu, 15 Mar 2018 12:56:17 -0700 (PDT) Received: from mail-pg0-x229.google.com (mail-pg0-x229.google.com [IPv6:2607:f8b0:400e:c05::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 62DFB124BAC; Thu, 15 Mar 2018 12:56:17 -0700 (PDT) Received: by mail-pg0-x229.google.com with SMTP id x2so3172018pgo.9; Thu, 15 Mar 2018 12:56:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=46exkVhHpbe7B1WY67FqeCIVOPf/sn/W1zmkZMyJvYo=; b=PkO1s2NHkMgi0fODVnP2GEN2CvzzUeoSeChlVwJ4gWwtNiUA5fXAQS8X5a54PT+YSF SBk8Re0CwjoOub4TSXCpEVbSMuQgRS1CAUtHJ4HApIQ7ApneADCh8uRhK3csQ/j8oNm/ ZJxP/SdtYSokLKjjvkZjRcol50VslbFKoKvR8xDz1zk2e4Zc8sAqQB8aNiqrED3gQ0aa FLAqSj1MCINo2nt4XONdrg/7hlYw5E2M0lRwsER2ey+lA3lECN5//e1vTcRvhjO1eTWR /33gdxqxtVkX5sAR1cVEXmrP+eVvN8rgzOSFPUjCyg4xY96ofJ8To7hl8FNtFA5pDceB 9gqQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:subject:to:cc:references:from:message-id :date:user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=46exkVhHpbe7B1WY67FqeCIVOPf/sn/W1zmkZMyJvYo=; b=hwuibn0gLCeO4tnBlwujCXke7rn3xCmeCgieW50JG9RtB+uiLwoA1g84amQAQTU07K JKUMk5jzxf+211/zPw9RHtyCktgR7kPHeLwmhhC89wOAzY02SV0rTWR9EJ4ApaB3iOWa KEsVqSspWoU2/LM6QWwpyiTfrZMZOPB/tfNKhZ6HT5C9O5jBaaSwVXIPb6As2dNyQC+J J2B793WRgIJVcDGee4rhgJ3HiteMbl2Fk++nL7NEhYLJKzsO9dobqdp3KnbEfwuwojeD o826rN1eJ40kN5imCGUwAMbMIwGYSF6YQHv0Q3+ekaahqJtbGpOkNyf/paLjTOl6zkkA wkDw== X-Gm-Message-State: AElRT7G7zaCWajBmWcB/UfLbYW1D6J7xSWOoZPf+O36Td/talaqIRRbk Hri2lcvqdC0B+pbJc58Enmc= X-Google-Smtp-Source: AG47ELu/z9BluQXXipj2Zbu1Ui89JR+tqJXwQchDnyBzDMkmj3q4+FBo2w24RMECj57tQpTLN+YjBA== X-Received: by 10.99.98.196 with SMTP id w187mr7774980pgb.307.1521143777085; Thu, 15 Mar 2018 12:56:17 -0700 (PDT) Received: from [192.168.178.30] ([118.148.72.177]) by smtp.gmail.com with ESMTPSA id s90sm12518632pfd.153.2018.03.15.12.56.13 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 15 Mar 2018 12:56:16 -0700 (PDT) Sender: Brian Carpenter To: Ingemar Johansson S , Lin Han , "tte@cs.fau.de" Cc: "tcpm@ietf.org" , "tsvwg@ietf.org" , "'iccrg@irtf.org'" References: <1D30AF33624CDD4A99E8C395069A2A162CDBB467@sjceml521-mbs.china.huawei.com> From: Brian E Carpenter Message-ID: <49e08509-284b-96ab-c10e-1699d82daba5@gmail.com> Date: Fri, 16 Mar 2018 08:56:20 +1300 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Mar 2018 19:56:19 -0000 On 15/03/2018 21:23, Ingemar Johansson S wrote: ... > [IJ] As for eNB, the allocation of GBR/MBR comes with admission control. However because of physical limitations in terms of limited power coverage and/or radio interference, no in-band or out of band QoS signaling in the world can guarantee a given throughput in all conditions. It is all matter of prioritization of the available resource blocks, where each resources worth in terms of bits is dictated by the laws of Shannon, somewhat on steroids with the use of adaptive antenna beamforming. I just wanted to applaud that. In a wireless network where random interference is always possible, physics tells us that you can never ignore Shannon's theorem, and you can never ignore queueing theory as a result. Brian From nobody Thu Mar 15 16:17:28 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5E635120454; Thu, 15 Mar 2018 16:17:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.659 X-Spam-Level: X-Spam-Status: No, score=-1.659 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, HTML_OBFUSCATE_05_10=0.26, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=nokia.onmicrosoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Sk1DtXrNVJfZ; Thu, 15 Mar 2018 16:17:12 -0700 (PDT) Received: from EUR02-AM5-obe.outbound.protection.outlook.com (mail-eopbgr00122.outbound.protection.outlook.com [40.107.0.122]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 15ADD127419; 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boundary="_000_AM5PR0701MB2547AA3C16E849FDFED8857093D00AM5PR0701MB2547_" MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5bd84f43-6ab8-47bf-39ed-08d58acadec4 X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Mar 2018 23:17:06.7321 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0701MB1841 Archived-At: Subject: [tcpm] Questions on draft-han-tsvwg-cc-00 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Mar 2018 23:17:15 -0000 --_000_AM5PR0701MB2547AA3C16E849FDFED8857093D00AM5PR0701MB2547_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Authors, all, I have read draft-han-tsvwg-cc-00. Below I have listed a number of question= s, which I believe would have to be addressed when discussing such a mechan= ism in the IETF or IRTF. This e-mail is strictly limited to the content of draft-han-tsvwg-cc-00. As= the draft does not specify how the CIR and PIR will actually be guaranteed= in the Internet, as well as how OAM signaling will work at Internet scale,= I will not comment here on these assumptions, except regarding requirement= s that strictly follow from the content of the I-D. The technical, economic= al, and regulation aspects of the assumptions are not in scope of TCPM and = they need to be discussed and solved elsewhere. Questions on draft-han-tsvwg-cc-00: 1/ The document seems to implicitly assume that network resources are reser= ved for *every* single TCP connection, right? * If that assumption is correct, it has to be spelt out explicitly in t= he text and it has to be noted that the underlying technology has to provid= e these capabilities *for every single* TCP connection. * Otherwise sentences like "after a TCP session is successfully initia= ted its congestion window (cwnd) jumps to CIR" would not make sense as mult= iple TCP connections within an traffic aggregate policied by CIR/PIR could = start to all send with CIR in parallel, which would trigger massive congest= ion. * As an example, in my reading draft-han-6man-in-band-signaling-for-tra= nsport-qos-00 would allow also reservations e.g. for aggregates of multiple= TCP connections. Such an operation mode seems not be compatible with the s= uggested mechanism in this I-D, as far as I understand. So the requirements= have to be made explicit. * Also, sentences such as "it is assumed that in bandwidth guaranteed n= etworks there have been network resources (bandwidths, queues etc.) dedicat= ed to the TCP flows" have to be corrected to specify that for the mechanism= in this draft to work correctly, the resources have to be guaranteed to ev= ery single TCP connection, not multiple "flows". 2/ Why does the document not rely on ECN (and not even reference ECN)? * For instance, the following requirement "It is important that OAM nee= ds to be able to detect if any device's buffer depth has exceeded the pre-= configured threshold, as this is an indication of potential congestion and = packet drop" could possibly be solved by ECN, no? * Even in case another OAM mechanism could be used in addition, a compr= ehensive TCP congestion control specification would have to also cover the = reaction to ECN marks as well, as well as the potential combination of feed= back results. Why is this missing? * Or would the document mandates that ECN MUST NOT be enabled for TCP c= onnections using this congestion control mechanism? 3/ Why does the document assume that congestion windows are calculated in s= egments and not in bytes? * RFC 5681 as well as many other RFCs calculate CWND in bytes. * However, I believe equations such "MinBandwidthWND =3D CIR * RTT/MSS"= or "MaxBandwidthWND =3D PIR * RTT/MSS" would return a window counted in MS= S segments. * Apart from the mismatch with the TCP standards, this sort of equation= might also requires a discussion on how to deal with integer division. 4/ How does the mechanism deal with IP and TCP header overhead? * TCP window sizes are about the TCP bytestream, while the actual IP pa= ckets sent by a TCP/IP stack will include an IP and TCP header. If one negl= ects the IP and TCP headers in the congestion window calculation, the resul= ting IP packet rate will be larger than the CIR and PIR seen in the TCP lay= er. This could result in packet drops if CIR and PIR are enforced e.g. for = IP packet length. * How will this problem be solved? Note that TCP (and also IP) can incl= ude header options, which results in variable header sizes. The number of T= CP options can be different for each TCP segment. How does this congestion = control mechanism correctly handle the headers and the options in IP and TC= P headers? 3/ How does the document deal with RTT variations? Is the assumption that t= he RTT is constant? * As far as I can tell from experiments, the RTT estimation is importan= t when applying a rate to window-based congestion control, which is what th= is document does. * Equations such "MinBandwidthWND =3D CIR * RTT/MSS" or "MaxBandwidthWN= D =3D PIR * RTT/MSS" only provide a window equivalent to the bandwidth-dela= y product of the path if the RTT sample is a correct prediction of the actu= al delay that the segments in flight will experience. How does the mechanis= m suggested in this document correctly predict the future RTT of the segmen= ts that are sent by the sender at a given point in time? * As an example, assume that the RTT at time t=3D10s is determined as 8= 0ms. Assume PIR =3D 10 Mbps and neglect the questions 3/ and 4/. Then this = document would probably assume that MaxBandwidthWND=3D100 kB is the bandwid= th delay product of the path during t=3D10s and t=3D10.08s, i.e., the maxim= um amount of outstanding data that can be sent in that time without drops (= or exceeding PIR). But assume that the actual round-trip delay of segments = has dropped to 40ms after the last RTT management, which means that the max= imum bandwidth delay product of the path at t=3D10s+epsilon is only 50 kB. = As a result, 50 Kb out of the congestion window would likely be dropped dur= ing t=3D10s and t=3D10.08s. And, due to the wrong RTT value, the effective = data rate of the sender could even be 20 Mbps, if the RTT mismatch is not d= etected immediately, or, e.g., if EWMA will delay the update of the weighte= d RTT parameter to the actual value. * So how does the proposed scheme to indeed determine a window that mee= ts the statement "This means a TCP sender is never allowed to send data at = a rate larger than PIR" if the RTT is not constant? Does this assume rate = pacing in the TCP sender for each TCP connection? 4/ How is it ensured that OAM alarms will reach the TCP sender in time in a= ll possible "random failure" cases? * As far as I understand, the following statement "When a sender receiv= es the third duplicated ACK, but no previous OAM congestion alarm has been = received, then it is considered that a segment is lost due to random failur= e not congestion. In this case the cwnd is not changed." mandates that an = OAM alarm is received prior to the third duplicate ACK *in all potential ca= ses* of congestion. If the OAM alarm got lost or delayed, this condition wo= uld imply that cwnd is not changed despite a segment has been dropped due t= o congestion, which would be a violation of fundamental Internet congestion= control principles. * Please expand on how this document ensures that cwnd will be reduces = in all potential cases when a packet gets dropped due to congestion, and wh= at requirements on the OAM alarms propagation follow from that. Of specific= interest are effects such as packet drops of packets relevant for the OAM = information, reordering of packets, asymmetric routing in forward and rever= se direction, use of multiple paths in parallel (ECMP), and the like. If th= e document makes assumption about the path such as in-order packet delivery= or the like, these assumptions need to be spelt out explicitly. * I understand that the OAM could be solved in different ways and the s= olution is independent of this document. But this document has to comprehen= sively specify all technical requirements that the OAM mechanism has to mee= t in order to ensure that every single packet drop due to congestion always= results in a cwnd reduction. Otherwise the algorithm has to change as it d= oes not safely prevent congestion. 5/ What is the expected performance benefit? Are there situations in which = performance will be worse than standard TCP congestion control? * The document does not contain any data of potential improvements or d= eteriorations as compared to the TCP standard congestion control. I assume = that such data will be presented to explain why this mechanism is proposed,= and what benefits it has. * As I have experimented with similar mechanisms quite a bit, I believe= there will be cases in which this congestion control mechanism will perfor= m worse than a TCP sender fully compliant to RFC 5681, when using the same = network path with CIR and PIR guarantees. I believe this document should an= alyze these cases and reason why a worse performance than standard TCP cong= estion control will be acceptable. IMHO this issue will specifically apply = in cases when PIR is significantly larger than CIR, and if the RTT is large= . As far as I can see, this draft mandates to start the data transfer in co= ngestion avoidance at CIR rate, which means that it can take many RTTs unti= l the sender reaches the PIR. In contrast, RFC 5681 will run slow-start, an= d RFC 5681 states that the "initial value of ssthresh SHOULD be set arbitra= rily high". This means that the TCP sender can reach PIR within few RTTs an= d thus can send with full PIR speed, while a sender using draft-han-tsvwg-c= c-00 will send with a much lower speed CIR+epsilon. For short and medium-si= zed data transfers, IMHO it can happen that the congestion control accordin= g to RFC 5681 will significantly outperform the mechanism suggested in this= document, i.e., it will complete data transfers orders of magnitude faster= even without any knowledge about CIR and PIR. Have the authors compared th= is mechanism to the performance of RFC 5681? * Also, have the authors compared the performance of this mechanism as = compared to a modern TCP stack, which often use RFC 6928 (IW 10) and RFC 83= 12 (CUBIC)? In what cases has the suggested congestion control a better per= formance? I ask this because I have performed experiments 10 years ago with= congestion control schemes that have some similarity to what is suggested = here, and they also used knowledge about the path properties. In those expe= riments, it turned out to be quite difficult to design an algorithm that us= es knowledge about the path (such as CIR/PIR) and that outperforms CUBIC in= combination IW 10, even if such a stack is totally unaware of the path. Th= is has been discussed e.g. in ICCRG https://www.ietf.org/proceedings/73/sli= des/iccrg-2.pdf. As context, "more-start" in this document is somewhat simi= lar to what is proposed in this I-D (but applied to CUBIC), while the "init= ial-start" graphs somehow corresponds to what was later specified in RFC 69= 28 (IW 10) and RFC 8312 (CUBIC). 6/ For what application traffic patterns is this mechanism proposed? * The document states in Section 3 "... with the development of new app= lications, such as AR/VR". What properties do such applications have to lev= erage the mechanism suggested in this document? Is it possible to character= ize what the "new" requirements are, and how the suggested algorithm meets = these requirements? * Is it suggested to apply this congestion control to real-time media t= raffic over TCP? If so, what would be the benefit of using TCP in general a= nd of the specific mechanism compared to congestion control algorithm for s= uch traffic (e.g., the RMCAT working group)? This list of questions is not comprehensive, but I'll stop here. Regarding potential next steps of this document in the TCPM working group, = I believe that the applicable TCPM charter wording is: "In addition, TCPM m= ay document alternative TCP congestion control algorithms that are known to= be widely deployed, and that are considered safe for large-scale deploymen= t in the Internet." Until these prerequisites are fulfilled in the Internet= , in my view the document cannot be adopted in TCPM. Research could be perf= ormed in the IRTF, e.g., in ICCRG. Thanks Michael (with no hat on) --_000_AM5PR0701MB2547AA3C16E849FDFED8857093D00AM5PR0701MB2547_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Authors, all,

 

I have read draft-han-tsvwg-cc-00. Below I have list= ed a number of questions, which I believe would have to be addressed when d= iscussing such a mechanism in the IETF or IRTF.

 

This e-mail is strictly limited to the content of dr= aft-han-tsvwg-cc-00. As the draft does not specify how the CIR and PIR will= actually be guaranteed in the Internet, as well as how OAM signaling will = work at Internet scale, I will not comment here on these assumptions, except regarding requirements that stri= ctly follow from the content of the I-D. The technical, economical, and reg= ulation aspects of the assumptions are not in scope of TCPM and they need t= o be discussed and solved elsewhere.

 

Questions on draft-han-tsvwg-cc-00:

 

1/ The document seems to implicitly assume that netw= ork resources are reserved for *every* single TCP connection, right?=

 

  • If that assumptio= n is correct, it has to be spelt out explicitly in the text and it has to b= e noted that the underlying technology has to provide these capabilities *<= b>for every single* TCP connection.
  • Otherwise sentences like “after a TCP session is successfully  initiated its conge= stion window (cwnd) jumps to CIR” would not make sense as multiple TCP conn= ections within an traffic aggregate policied by CIR/PIR could start to all send with CIR in parallel, which would trigger massive conges= tion.
  • As an example, in my reading draft-han-6man-in-band-signaling-for-trans= port-qos-00 would allow also reservations e.g. for aggregates of multiple T= CP connections. Such an operation mode seems not be compatible with the suggested mechanism in this I-D, as far as I understand. So the r= equirements have to be made explicit.
  • Also, sentences such as “it is assumed that in bandwidth guaranteed networks there hav= e been network resources (bandwidths, queues etc.) dedicated to the TCP flo= ws” have to be corrected to specify that for the mechanism in this draft to work correctly, the resources have to be guaranteed to ev= ery single TCP connection, not multiple “flows”.

 

2/  Why does the document not rely on ECN (and = not even reference ECN)?

 

  • For instance, the= following requirement “It is important that OAM needs to be able to detect if any device's  = buffer depth has exceeded the pre-configured threshold, as this is an indic= ation of potential congestion and packet drop” could possibly be solved by ECN, no?
  • Even in case another OAM mechanism coul= d be used in addition, a comprehensive TCP congestion control specification= would have to also cover the reaction to ECN marks as well, as well as the= potential combination of feedback results. Why is this missing?
  • Or would the document mandates tha= t ECN MUST NOT be enabled for TCP connections using this congestion control= mechanism?

 

3/ Why does the document assume that congestion wind= ows are calculated in segments and not in bytes?

 

  • RFC 5681 as well = as many other RFCs calculate CWND in bytes.
  • However, I believe equations such “MinBandwidthWND =3D CIR * RTT/MSS” or “MaxBandwidthWND =3D PIR * RTT/MSS” would return a window counted in MSS se= gments.
  • Apart from the mismatch with the TCP standards, this sort of equation= might also requires a discussion on how to deal with integer division.

 

4/ How does the mechanism deal with IP and TCP heade= r overhead?

 

  • TCP window sizes = are about the TCP bytestream, while the actual IP packets sent by a TCP/IP = stack will include an IP and TCP header. If one neglects the IP and TCP hea= ders in the congestion window calculation, the resulting IP packet rate will be larger than the CIR and PIR seen in t= he TCP layer. This could result in packet drops if CIR and PIR are enforced= e.g. for IP packet length.
  • How will this problem be solved? Note that TCP (a= nd also IP) can include header options, which results in variable header si= zes. The number of TCP options can be different for each TCP segment. How d= oes this congestion control mechanism correctly handle the headers and the opt= ions in IP and TCP headers?

 

3/ How does the document deal with RTT variations? I= s the assumption that the RTT is constant?

 

  • As far as I can t= ell from experiments, the RTT estimation is important when applying a rate = to window-based congestion control, which is what this document does.<= /o:p>
  • Equatio= ns such “MinBandwidthWND =3D CIR * RTT/MSS” or “MaxBandwidthWND =3D PIR * RTT/MSS” only provide a window equivalent to the= bandwidth-delay product of the path if the RTT sample is a correct predict= ion of the actual delay that the segments in flight will experience. How does = the mechanism suggested in this document correctly predict the future RTT o= f the segments that are sent by the sender at a given point in time?
  • As an ex= ample, assume that the RTT at time t=3D10s is determined as 80ms. Assume PI= R =3D 10 Mbps and neglect the questions 3/ and 4/. Then this document would= probably assume that MaxBandwidthWND=3D100 kB is the bandwidth delay product of the path during t=3D10s and t=3D10.08s, i.e., t= he maximum amount of outstanding data that can be sent in that time without= drops (or exceeding PIR). But assume that the actual round-trip delay of s= egments has dropped to 40ms after the last RTT management, which means that the maximum bandwidth delay product = of the path at t=3D10s+epsilon is only 50 kB. As a result, 50 Kb out of= the congestion window would likely be dropped during t=3D10s and t=3D10.08= s. And, due to the wrong RTT value, the effective data rate of the sender could even be 20 Mbps, if the RTT mismatch is not = detected immediately, or, e.g., if EWMA will delay the update of the weight= ed RTT parameter to the actual value.
  • So how does the proposed scheme to inde= ed determine a window that meets the statement “This means a TCP sender is never allowed to send data at a rate larger tha= n PIR”<= /span>  if the RTT is not constant? Does this assume rate pacing in the TCP sender for each TCP connection?

 

4/ How is it ensured that OAM alarms will reach the = TCP sender in time in all possible “random failure 

  • “When a sender receives the third duplicated ACK, but no previous OAM conge= stion alarm has been received, then it is considered that a segment is lost= due to random failure not congestion.  In this case the cwnd is not changed.” mandates that an OAM alarm is received prior to = the third duplicate ACK *in all potential cases* of congestion. If t= he OAM alarm got lost or delayed, this condition would imply that cwnd is not changed despite a segment has been dropped due to c= ongestion, which would be a violation of fundamental Internet congestion co= ntrol principles.
  • Please expand on how this document ensur= es that cwnd will be reduces in all potential cases when a packet gets drop= ped due to congestion, and what requirements on the OAM alarms propagation follow from that. Of specific interest are effects such as packet drops of= packets relevant for the OAM information, reordering of packets, asymmetri= c routing in forward and reverse direction, use of multiple paths in parall= el (ECMP), and the like. If the document makes assumption about the path such as in-order packet delivery = or the like, these assumptions need to be spelt out explicitly.<= /li>
  • I understand that the OAM could be solved in different ways and the s= olution is independent of this document. But this document has to comprehen= sively specify all technical requirements that the OAM mechanism has to meet in order to ensure that every single pa= cket drop due to congestion always results in a cwnd reduction. Otherwise t= he algorithm has to change as it does not safely prevent congestion.

 

5/ What is the expected performance benefit? Are the= re situations in which performance will be worse than standard TCP congesti= on control?

 

  • The document does= not contain any data of potential improvements or deteriorations as compar= ed to the TCP standard congestion control. I assume that such data will be = presented to explain why this mechanism is proposed, and what benefits it has.
  • As I have experimented with similar m= echanisms quite a bit, I believe there will be cases in which this congesti= on control mechanism will perform worse than a TCP sender fully compliant t= o RFC 5681, when using the same network path with CIR and PIR guarantees. I believe this do= cument should analyze these cases and reason why a worse performance than s= tandard TCP congestion control will be acceptable. IMHO this issue will spe= cifically apply in cases when PIR is significantly larger than CIR, and if the RTT is large. As far as I can= see, this draft mandates to start the data transfer in congestion avoidanc= e at CIR rate, which means that it can take many RTTs until the sender reac= hes the PIR. In contrast, RFC 5681 will run slow-start, and RFC 5681 states that the “initial value of = ssthresh SHOULD be set arbitrarily high”. This means that the TCP sen= der can reach PIR within few RTTs and thus can send with full PIR speed, wh= ile a sender using draft-han-tsvwg-cc-00 will send with a much lower speed CIR+epsilon. For short and medium-sized d= ata transfers, IMHO it can happen that the congestion control according to = RFC 5681 will significantly outperform the mechanism suggested in this docu= ment, i.e., it will complete data transfers orders of magnitude faster even without any knowledge about CIR and PIR. H= ave the authors compared this mechanism to the performance of RFC 5681?
  • Also,= have the authors compared the performance of this mechanism as compared to= a modern TCP stack, which often use RFC 6928 (IW 10) and RFC 8312 (CUBIC)?= In what cases has the suggested congestion control a better performance? I ask this because I have performed experiments 10 y= ears ago with congestion control schemes that have some similarity to what = is suggested here, and they also used knowledge about the path properties. = In those experiments, it turned out to be quite difficult to design an algorithm that uses knowledge about= the path (such as CIR/PIR) and that outperforms CUBIC in combination IW 10= , even if such a stack is totally unaware of the path. This has been discus= sed e.g. in ICCRG https://www.ietf.org/proceedings/73/slides/i= ccrg-2.pdf. As context, “more-start” in this = document is somewhat similar to what is proposed in this I-D (but applied to CUBIC), while the “initial-start” gra= phs somehow corresponds to what was later specified in RFC 6928 (IW 10) and= RFC 8312 (CUBIC).

 

6/ For what application traffic patterns is this mec= hanism proposed?

 

  • The document stat= es in Section 3 “… with the development of new applications, su= ch as AR/VR”. What properties do such applications have to leverage t= he mechanism suggested in this document? Is it possible to characterize what the “new” requirements are, and how the s= uggested algorithm meets these requirements?
  • Is it suggested to apply this co= ngestion control to real-time media traffic over TCP? If so, what would be = the benefit of using TCP in general and of the specific mechanism compared = to congestion control algorithm for such traffic (e.g., the RMCAT working group)?

 

This list of questions is not comprehensive, but I&#= 8217;ll stop here.

 

Regarding potential next steps of this document in t= he TCPM working group, I believe that the applicable TCPM charter wording i= s: “In addition, TCPM may document alternative TCP congestion control algorith= ms that are known to be widely deployed, and that are considered safe for l= arge-scale deployment in the Internet.” Until these prerequisites are fulfilled in the Internet, in my view the do= cument cannot be adopted in TCPM. Research could be performed in the IRTF, = e.g., in ICCRG.

 

Thanks

 

Michael (with no hat on)

--_000_AM5PR0701MB2547AA3C16E849FDFED8857093D00AM5PR0701MB2547_-- From nobody Thu Mar 15 16:42:15 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E4EA4127873; Thu, 15 Mar 2018 16:42:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.911 X-Spam-Level: X-Spam-Status: No, score=-2.911 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=-1, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=nokia.onmicrosoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WnDlrpIKOT9Q; Thu, 15 Mar 2018 16:42:11 -0700 (PDT) Received: from EUR01-VE1-obe.outbound.protection.outlook.com (mail-ve1eur01on0098.outbound.protection.outlook.com [104.47.1.98]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 63BD812778D; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-Network-Message-Id: a4933f1a-5bc9-4190-fa9c-08d58ace5de1 X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Mar 2018 23:42:08.4419 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0701MB1796 Archived-At: Subject: Re: [tcpm] draft-han-tsvwg-cc (was: Re: [tsvwg] Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Mar 2018 23:42:14 -0000 I am responding since the e-mail was directed to me... > TCPM might be actually a good idea, and that WG's feedback would be highl= y > welcome. See my sepatate e-mail. > Let me send a separate email to the chairs and ask if they could consider > presenting this in TCPM. Please feel free to answer my questions on the TCPM list or in the presenta= tion. The list of questions is obviously not comprehensive. =20 > > From the abstract: ?????? This draft proposes a new TCP congestion cont= rol > algorithm used in bandwidth guaranteed networks. It is an extension to t= he > current TCP standards.??? >=20 > The way i would describe it: This memo defines simple extensions to TCP- > Reno CC to support and leverage a pre-known network guaranteed > (minimum) bandwidth (CIR) and pre-known maximumum needed > bandwidth (PIR). >=20 > IMHO, this work is very much orthogonal to how you would determine PIR > and CIR, I disagree. The work has to specify exactly what requirements need to be fu= lfilled to make the mechanism applicable, and these requirements would have= to be explicitly listed in the document.=20 For instance, it seems to be assumed that CIR and PIR is correctly known to= the sender. So the document would e.g. have to discuss the implications if= the sender has erroneous CIR or PIR information.=20 How the requirements would indeed met would be irrelevant, but of course in= the IETF context meeting all the requirements would have to be guaranteed = for the Internet. > the draft mentions some IMHO cool new ideas how to do this, but > this CC draft by itself would be a great benefit to application developer= s > today (assume CIR/PIR API extensions to transport service -> TAPS, etc. p= p). I don't see a lot of discussion in the document on how the application deve= lopers will get a benefit from this, but I assume this can be added. > My most simple deployment scenario is simple GUI on video devices/apps, > e.g.: > in home (STB) where i could select guaranted minimum qualiy (translated b= y > app into CIR), and (optional) maximum quality (PIR). On the parents livin= g > room STB CIR would be set according to 4k, and maybe in one other room to > FullHD, and the rest has to start compete for available bandwidth all the= way > from *yuck* QCIF). Is video streaming the target application of what we discuss here? > Of course, with more and more high-bitrate apps like AR/VR and others, th= e > problem to support easy policy differentiation for different apps will > increase, but i always like to look first at the most common use case tha= t > could profit today. I may be wrong but I believe for AR/VR apps the application traffic pattern= can depend on the application design, no? So will AR/VR be impossible over the current Internet with the tools we hav= e already? > I feel like we have discussed this problem forever, but i am not aware of= any > actual progress that app developers could use. We really need to break > through the chicken & egg circle. IMHO we first need to enable the host > stacks to do something like this, and then folks will see a lot easier th= e need > to have better in-network mechanisms to actually guarantee CIR. Me, as well as some of my students, have implemented mechanisms like this i= n the Linux TCP stack 10 years ago. None of us had kernel programming exper= ience. It wasn't super-complex to change the TCP stack to make this happen. Given that is simple to implement the logic in the host stacks, what has be= en missing so far according to this chicken&egg logic? And I assume that you are not suggesting to deploy TCP stacks that send CBR= traffic into the current Internet without reacting to congestion signals, = right? =20 > So, i wouldn't know something more pragmatic & simple than this proposal > based on TFP reno. >=20 > > Alternatively, corresponding research could perhaps be performed in the > ICCRG. ICCRG has published RFC 6077 to document some of the open > research issues in this space. >=20 > Nice overview for researchers. Can't quite find from browsing a section > related to this CIR/PIR knowledge issue, admission control is mentioned o= nly > once in passing. Let me know what you think i should specifically look in= to, > and we'll be happy to relate to that RFC6077 work in the draft. Section 3.1 in RFC 6077 applies also to CIR and PIR signaling. Thanks Michael From nobody Thu Mar 15 17:07:00 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3D318126DD9; Thu, 15 Mar 2018 17:06:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.92 X-Spam-Level: X-Spam-Status: No, score=-1.92 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=nokia.onmicrosoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CI18D6SK8Fa6; Thu, 15 Mar 2018 17:06:51 -0700 (PDT) Received: from EUR01-DB5-obe.outbound.protection.outlook.com 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localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F077812D7F8; Thu, 15 Mar 2018 17:31:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.23 X-Spam-Level: X-Spam-Status: No, score=-4.23 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gqtF-17TzsFY; Thu, 15 Mar 2018 17:31:52 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2A297127522; Thu, 15 Mar 2018 17:31:52 -0700 (PDT) Received: from lhreml704-cah.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id 5FA7189A5628F; Fri, 16 Mar 2018 00:31:48 +0000 (GMT) Received: from SJCEML703-CHM.china.huawei.com (10.208.112.39) by lhreml704-cah.china.huawei.com (10.201.108.45) with Microsoft SMTP Server (TLS) id 14.3.382.0; Fri, 16 Mar 2018 00:31:49 +0000 Received: from SJCEML521-MBS.china.huawei.com ([169.254.2.168]) by SJCEML703-CHM.china.huawei.com ([169.254.5.179]) with mapi id 14.03.0382.000; Thu, 15 Mar 2018 17:31:46 -0700 From: Lin Han To: Ingemar Johansson S , "tte@cs.fau.de" CC: "tcpm@ietf.org" , "tsvwg@ietf.org" , "'iccrg@irtf.org'" Thread-Topic: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) Thread-Index: AdO7ZqLf99MPKZX+ToKs31yM2w2JXQAb219wABbyGdAAHp3igA== Date: Fri, 16 Mar 2018 00:31:46 +0000 Message-ID: <1D30AF33624CDD4A99E8C395069A2A162CDBBA0E@sjceml521-mbs.china.huawei.com> References: <1D30AF33624CDD4A99E8C395069A2A162CDBB467@sjceml521-mbs.china.huawei.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.212.244.119] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 00:31:56 -0000 Hi, See inline with [LH] Thanks Lin -----Original Message----- From: Ingemar Johansson S [mailto:ingemar.s.johansson@ericsson.com]=20 Sent: Thursday, March 15, 2018 1:24 AM To: Lin Han ; tte@cs.fau.de Cc: tcpm@ietf.org; tsvwg@ietf.org; 'iccrg@irtf.org' ; Ingem= ar Johansson S Subject: RE: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for = TSVWG@IETF101) Hi Please see inline, marked [IJ] /Ingemar > -----Original Message----- > From: Lin Han [mailto:Lin.Han@huawei.com] > Sent: den 14 mars 2018 22:22 > To: Ingemar Johansson S ; > tte@cs.fau.de > Cc: tcpm@ietf.org; tsvwg@ietf.org; 'iccrg@irtf.org' > Subject: RE: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests=20 > for > TSVWG@IETF101) >=20 > Hi, Ingemar >=20 > Tanks for the comments, See inline answer >=20 > Best Regards >=20 > Lin >=20 > -----Original Message----- > From: Ingemar Johansson S [mailto:ingemar.s.johansson@ericsson.com] > Sent: Wednesday, March 14, 2018 12:56 AM > To: Lin Han ; tte@cs.fau.de > Cc: tcpm@ietf.org; tsvwg@ietf.org; 'iccrg@irtf.org' ;=20 > Ingemar Johansson S > Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests=20 > for > TSVWG@IETF101) >=20 > Hi >=20 > This subject pops up every once in a while. > [LH] You are right -:) But this time, we bring up this issue for the=20 > future applications like AR/VR, not for applications that current TCP=20 > works well. See the detailed analysis in=20 > draft-han-iccrg-arvr-transport-problem-00. We believe for the=20 > applications, such as AR/VR/TSN, that are much sensitive to congestion=20 > or delay, current technologies are hard to satisfy the requirement. [IJ] Please have a look at the RITE project experiments https://riteproject= .eu/, these show that you can achieve very short latency with L4S technolog= y, L4S can in many ways coexist with diffserv and this draft outlines how t= he two can work together https://tools.ietf.org/pdf/draft-briscoe-tsvwg-l4s= -diffserv-00.pdf . Given this I am not convinced why an inband QoS solution= is needed for AR/VR. [LH] Thanks for the reference, L4S can achieve the small latency for a clos= ed network like DC where all hosts must behave same according to the requir= ement to adjust the rate when the queue is exceeding the threshold. If some= host does not follow, i.e, ignore the ECN bit, I don't believe the latency= can be that good because all L4S flows share the same queue. Another aspect is that even using ECN, we still cannot provide an expected = and differentiated bandwidth to different user. DiffServ can only provide d= ifferentiated service by PHB, but without the quantity control in terms of = bandwidth or latency. >=20 > I would like to add my perspective, given how I understand that 3GPP=20 > technology works. The 3GPP QoS framework can be used to offer for=20 > instance a Guaranteed bandwidth (GBR) to applications. The operation=20 > is that the "bearer" gets increased scheduling priority once the=20 > throughput is below the GBR value. > In simulations I have verified that this framework can deliver a GBR=20 > to TCP flows when the network load increases, at least as long it is=20 > possible to push back other bearers with a lower priority. So, seen=20 > from my experience so far I am not fully confident that additional inband= signaling is needed. > [LH] Does it work well when the GW or eNodeB are congested? The=20 > purpose for in-band signaling is to guarantee network resource for a=20 > critical application no matter what happens. The congestion is the=20 > major problem for such requirement by current technology, because all=20 > flows can only share the bandwidth during congestion. [IJ] As for eNB, the allocation of GBR/MBR comes with admission control. Ho= wever because of physical limitations in terms of limited power coverage an= d/or radio interference, no in-band or out of band QoS signaling in the wor= ld can guarantee a given throughput in all conditions. It is all matter of = prioritization of the available resource blocks, where each resources worth= in terms of bits is dictated by the laws of Shannon, somewhat on steroids = with the use of adaptive antenna beamforming.=20 [LH] Yes, if the air interface has limit, no matter what signaling we use w= ill not help. In-band signaling just provide a way to control the network d= evice on the path to give a session expected resource. If the expected reso= urce cannot be given, the in-band signaling will notify the source host abo= ut the failure. The user can either reduce the resource demanded or use the= traditional TCP. If there is traffic engineering tool involved, the user m= ay use different path that can satisfy the user's expectation for the TCP s= ession setup, this is not conflicting with the basic frame work of in-band = signaling. We can still use it with segment routing for such non-shortest p= ath scenario. >=20 > There can however be a benefit to e.g. determine an appropriate=20 > bitrate for a DASH session, depending on network load and/or coverage,=20 > but I would argue that out of band signaling is better in this case. > [LH] One benefit of in-band signaling is it can provide the dynamic=20 > resource (like Q depth) to the source. By using this signal, we can=20 > distinguish congestion packet loss and random physical loss. It can=20 > increase the good-put for application as we described in the new draft. [IJ] But isn't it better to use good AQMs instead as the goal should always= be to avoid large standing queues ?.=20 [LH] Same as using L4S, AQM still try to provide the faired resource alloca= tion to all TCP flows by the rule of max-min fairness. This works well if t= he link capacity is big enough and all TCP flows will get what its applicat= ion want. But when the link is congested, we cannot give some critical appl= ication the expected bandwidth, each flow will get the equal instantaneous = bandwidth determined the total number of flows. To overcome this difficulty= caused by TCP fairness, we have to reserve the resource for some applicati= on and exclude them from the resource sharing with others if the resource i= s not enough (treat those flow differently as others, i.e, different queuin= g/scheduler, etc). >=20 > As regards to "worst case latency", I am not sure that I follow here,=20 > are we discussing TSN/Detnet technology here, general link failures,=20 > or is it about means to control the queue delay in the network ?. As=20 > to the latter, I believe that it is worthwhile to look more closely at L4= S. > [LH] Yes, we want to control the delay for specified flow by change=20 > the queue/scheduler parameters. We believe only through such very fine=20 > control, we can achieve the expected service from application. We are=20 > in talk with detnet to see if they want an alternative solution other=20 > than PWE. L4S still only provides a statistical bounded latency when=20 > all hosts are upgraded to support L4S. For our solution, we don't need=20 > to change hosts if they don't want to use new TCP. [IJ] The L4S issue is that of deployment but you will face similar deployme= nt issues with inband QoS signaling, probably worse. L4S is basically very = simple technology whereas inband QoS implies more packet inspection and pro= cessing.=20 And I believe that TSN/Detnet is a different story as it tries to achieve e= xtremely tight scheduling, so far in confined domains. [LH] Yes, in-band signaling is more complicated technology. We are aware of= this, and only report it as an informational or experiment draft. In-band signaling does not need to program all network device. In real depl= oyment, only those aggregation device (may experience congestion) such as G= W, Edge router are required to be involved. Normally core routers link util= ization is less than 60% or something like that. >=20 > Regards > Ingemar Johansson >=20 >=20 > > Message: 2 > > Date: Tue, 13 Mar 2018 19:27:18 +0000 > > From: Lin Han > > To: Toerless Eckert , Gorry Fairhurst > > > > Cc: Thomas Nadeau , "tcpm@ietf.org" > > , "tsvwg@ietf.org" , "Scharf, > Michael > > (Nokia - DE/Stuttgart)" , > > "tsvwg-chairs@ietf.org" , Katsushi Kobayashi > > , Yingzhen Qu > > Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests > > for TSVWG@IETF101) > > Message-ID: > > <1D30AF33624CDD4A99E8C395069A2A162CDB9BA3@sjceml521- > > mbs.china.huawei.com> > > > > Content-Type: text/plain; charset=3D"us-ascii" > > > > Hi, Gorry/Toerless > > > > Here is some explanation and clarification for two drafts=20 > > (draft-han-tsvwg-cc and > > draft-han-6man-in-band-signaling-for-transport-qos) > > > > 1. About draft-han-tsvwg-cc compared with other CC for bandwidth=20 > > guaranteed network, such as gTFRC. > > draft-han-tsvwg-cc is a split draft from > > draft-han-6man-in-band-signaling-for- > > transport-qos . It proposes a new CC for a network if the TCP=20 > > session's bandwidth is guaranteed. Here the guaranteed bandwidth is=20 > > per TCP session and described by PIR/CIR and given directly by TCP=20 > > end > user. > > > > 2. About TCP-QS and=20 > > draft-han-6man-in-band-signaling-for-transport-qos > > >From my understanding, TCP-QS and > > >draft-han-6man-in-band-signaling-for- > > transport-qos do have similarity, both are kind of using in-band=20 > > signaling for the resource reservation. But they still have big differe= nce. > > 1). draft-han-6man-in-band-signaling-for-transport-qos is more=20 > > general > > in- band signaling method, it not only applies to TCP, but also UDP=20 > > or other upper layer of protocol, even the draft only exemplifies=20 > > the method > to TCP. > > 2). draft-han-6man-in-band-signaling-for-transport-qos provides=20 > > reserved resource for bandwidth and latency for the whole life of=20 > > TCP session. It gives more flavors and more granularity for the QoS=20 > > (unlike TCP-QS only has 16 values of starting bandwidth). Moreover,=20 > > it can support the "worst case latency" at each hop; also, it can=20 > > support the OAM to detect the congestion states, and support the=20 > > "forwarding state" for host to be notified in real-time about if the=20 > > resource reservation or QoS forwarding is interrupted by abnormal=20 > > situation such as > link/node failures. > > > > Best regards > > > > Lin > > From nobody Thu Mar 15 17:34:33 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 72161127522; Thu, 15 Mar 2018 17:34:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.91 X-Spam-Level: X-Spam-Status: No, score=-2.91 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=-1, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3b47f726-c966-465a-6728-08d58ad5ac50 X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Mar 2018 00:34:26.5600 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0701MB2884 Archived-At: Subject: Re: [tcpm] inband signaling (was: Re: [tsvwg] Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 00:34:32 -0000 > TCP quickstart really relates IMHO primarily to draft-han-6man-in-band- > signaling-for-transport-qos, but not to draft-han-tsvwg-cc. The latter on= e is This is wrong. Section 4.4 in RFC 4782 is very related to draft-han-tsvwg-c= c. Of specific interest is e.g. the handling of ssthresh. RFC 4782 also con= siders packet headers. > really meant to modify TCP assuming a known guaranteed CIR - whatever > mechanism is used to provide that guarantee. >=20 > TCP quickstart is an interesting example for inband signaling, which is w= hat > Lin's in-band-signaling draft does too. The main difference is that our d= raft > focusses on high-value traffic where per-flow state is feasible and benef= icial, > if not necessary. And TCP quickstart seems more targeted to ANY TCP flow. No. Quick-Start only has benefits if it is enabled by the applications that= can indeed leverage it, which is a subset of all TCP flows. If a host naiv= ely applies it to any TCP connection, there will be no benefit as most Quic= k-Start requests will be rejected. So the endpoint has a strong incentive t= o enable it only on these connections that actually leverage it. Actually d= oing this is a problem of its own. I have discussed this issue with AR/VR d= evelopers 10 years ago and it was non-trivial by then. It would be interest= ing to learn what has changed since then in the application developer commu= nity. > Which raises a complete different scalability challenge to TCP quickstart= . Yep. Quick-Start can be implemented in a router without per-flow state and = thus scales e.g. on network processors. 10 years ago we found that the key = performance bottleneck in the fast path would be the state-synchronization = between the different cores of a network processor. But as Quick-Start does= not perform hard guarantees, this can be worked around. I am not a hardware expert, any maybe state synchronization between many co= res is cheaper these days. But I'd really like to understand how hard QoS g= uarantees for single TCP connections would be achieved e.g. on modern multi= -core network processor (i.e., multiple TBit/s).=20 =20 > This type of comparison discussion will go into draft updates on our side= . >=20 > Would be interested in any more data points about the history of TCP > quickstart, eg: where it was observed in the wild in deployments. In my experiments 10 years ago, there was little performance benefit of Qui= ck-Start as compared to IW10, which was published in RFC 6928. My experimen= ts are published in http://www.ikr.uni-stuttgart.de/Content/Publications/Ar= chive/Sf_Diss_40112.pdf. I strongly suggest to compare new congestion control schemes tot CUBIC+IW10= as baseline, and to show how much performance benefit one indeed gets, and= at what risk and costs. Michael =20 From nobody Thu Mar 15 18:00:07 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 83089127873; Thu, 15 Mar 2018 18:00:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.218 X-Spam-Level: X-Spam-Status: No, score=-4.218 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DC_PNG_UNO_LARGO=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8bllD4Ut1Krj; Thu, 15 Mar 2018 17:59:58 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4A1B712422F; Thu, 15 Mar 2018 17:59:58 -0700 (PDT) Received: from lhreml706-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id E7AACE9BFC583; Fri, 16 Mar 2018 00:59:54 +0000 (GMT) Received: from SJCEML702-CHM.china.huawei.com (10.208.112.38) by lhreml706-cah.china.huawei.com (10.201.108.47) with Microsoft SMTP Server (TLS) id 14.3.382.0; Fri, 16 Mar 2018 00:59:55 +0000 Received: from SJCEML521-MBS.china.huawei.com ([169.254.2.168]) by SJCEML702-CHM.china.huawei.com ([169.254.4.179]) with mapi id 14.03.0382.000; Thu, 15 Mar 2018 17:59:47 -0700 From: Lin Han To: "Scharf, Michael (Nokia - DE/Stuttgart)" , Toerless Eckert , Gorry Fairhurst CC: Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" , Katsushi Kobayashi , Yingzhen Qu Thread-Topic: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) Thread-Index: AQHTvL6dNgq1fgunpk6VuHbKAe8Xt6PSB2hw Date: Fri, 16 Mar 2018 00:59:47 +0000 Message-ID: <1D30AF33624CDD4A99E8C395069A2A162CDBBA47@sjceml521-mbs.china.huawei.com> References: <5A9BEB65.6010102@erg.abdn.ac.uk> <050065D2-5F2E-4E79-9BD1-E1DC03F13900@acm.org> <5AA79C2E.1040808@erg.abdn.ac.uk> <20180313164928.GA17042@faui40p.informatik.uni-erlangen.de> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.212.244.119] Content-Type: multipart/related; boundary="_004_1D30AF33624CDD4A99E8C395069A2A162CDBBA47sjceml521mbschi_"; type="multipart/alternative" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 01:00:02 -0000 --_004_1D30AF33624CDD4A99E8C395069A2A162CDBBA47sjceml521mbschi_ Content-Type: multipart/alternative; boundary="_000_1D30AF33624CDD4A99E8C395069A2A162CDBBA47sjceml521mbschi_" --_000_1D30AF33624CDD4A99E8C395069A2A162CDBBA47sjceml521mbschi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, Scarf For draft-han-tsvwg-cc, we have some assumptions 1. User application setup TCP session with a given PIR/CIR, 2. Network devices on the path will satisfy such expectation. In details, t= he traffic with the rate below CIR is always guaranteed to pass, and above = PIR will be dropped; If the rate is between PIR and CIR, the traffic may be= competing with others to get the resource. This draft try to propose what we should change for the current CC for abov= e scenarios, the picture below may explain more clearly for what is the dif= ference of new algorithm with reno: [cid:image001.png@01D3BC87.670DC980] -----Original Message----- From: tsvwg [mailto:tsvwg-bounces@ietf.org] On Behalf Of Scharf, Michael (N= okia - DE/Stuttgart) Sent: Thursday, March 15, 2018 5:34 PM To: Toerless Eckert ; Gorry Fairhurst Cc: Thomas Nadeau ; tcpm@ietf.org; tsvwg@ietf.org;= tsvwg-chairs@ietf.org; Katsushi Kobayashi ; Yingzhen Qu Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101) > TCP quickstart really relates IMHO primarily to > draft-han-6man-in-band- signaling-for-transport-qos, but not to > draft-han-tsvwg-cc. The latter one is This is wrong. Section 4.4 in RFC 4782 is very related to draft-han-tsvwg-c= c. Of specific interest is e.g. the handling of ssthresh. RFC 4782 also con= siders packet headers. > really meant to modify TCP assuming a known guaranteed CIR - whatever > mechanism is used to provide that guarantee. > > TCP quickstart is an interesting example for inband signaling, which > is what Lin's in-band-signaling draft does too. The main difference is > that our draft focusses on high-value traffic where per-flow state is > feasible and beneficial, if not necessary. And TCP quickstart seems more = targeted to ANY TCP flow. No. Quick-Start only has benefits if it is enabled by the applications that= can indeed leverage it, which is a subset of all TCP flows. If a host naiv= ely applies it to any TCP connection, there will be no benefit as most Quic= k-Start requests will be rejected. So the endpoint has a strong incentive t= o enable it only on these connections that actually leverage it. Actually d= oing this is a problem of its own. I have discussed this issue with AR/VR d= evelopers 10 years ago and it was non-trivial by then. It would be interest= ing to learn what has changed since then in the application developer commu= nity. > Which raises a complete different scalability challenge to TCP quickstart= .. Yep. Quick-Start can be implemented in a router without per-flow state and = thus scales e.g. on network processors. 10 years ago we found that the key = performance bottleneck in the fast path would be the state-synchronization = between the different cores of a network processor. But as Quick-Start does= not perform hard guarantees, this can be worked around. I am not a hardware expert, any maybe state synchronization between many co= res is cheaper these days. But I'd really like to understand how hard QoS g= uarantees for single TCP connections would be achieved e.g. on modern multi= -core network processor (i.e., multiple TBit/s). > This type of comparison discussion will go into draft updates on our side= .. > > Would be interested in any more data points about the history of TCP > quickstart, eg: where it was observed in the wild in deployments. In my experiments 10 years ago, there was little performance benefit of Qui= ck-Start as compared to IW10, which was published in RFC 6928. My experimen= ts are published in http://www.ikr.uni-stuttgart.de/Content/Publications/Ar= chive/Sf_Diss_40112.pdf. I strongly suggest to compare new congestion control schemes tot CUBIC+IW10= as baseline, and to show how much performance benefit one indeed gets, and= at what risk and costs. Michael --_000_1D30AF33624CDD4A99E8C395069A2A162CDBBA47sjceml521mbschi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi, Scarf

 

For draft-han-tsvwg-cc, we have some assumptions<= o:p>

1. User application setup TCP session with a give= n PIR/CIR,

2. Network devices on the path will satisfy such = expectation. In details, the traffic with the rate below CIR is always guar= anteed to pass, and above PIR will be dropped; If the rate is between PIR a= nd CIR, the traffic may be competing with others to get the resource.

This draft try to propose what we should change f= or the current CC for above scenarios, the picture below may explain more c= learly for what is the difference of new algorithm with reno:

 

 

-----Original Message-----
From: tsvwg [mailto:tsvwg-bounces@ietf.org] On Behalf Of Scharf, Michael (N= okia - DE/Stuttgart)
Sent: Thursday, March 15, 2018 5:34 PM
To: Toerless Eckert <tte@cs.fau.de>; Gorry Fairhurst <gorry@erg.ab= dn.ac.uk>
Cc: Thomas Nadeau <tnadeau@lucidvision.com>; tcpm@ietf.org; tsvwg@iet= f.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi <ikob@acm.org>; Ying= zhen Qu <yingzhen.qu@huawei.com>
Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101)

 

> TCP quickstart really relates IMHO primarily= to

> draft-han-6man-in-band- signaling-for-transp= ort-qos, but not to

> draft-han-tsvwg-cc. The latter one is

 

This is wrong. Section 4.4 in RFC 4782 is very re= lated to draft-han-tsvwg-cc. Of specific interest is e.g. the handling of s= sthresh. RFC 4782 also considers packet headers.

 

> really meant to modify TCP assuming a known = guaranteed CIR - whatever

> mechanism is used to provide that guarantee.=

>

> TCP quickstart is an interesting example for= inband signaling, which

> is what Lin's in-band-signaling draft does t= oo. The main difference is

> that our draft focusses on high-value traffi= c where per-flow state is

> feasible and beneficial, if not necessary. A= nd TCP quickstart seems more targeted to ANY TCP flow.

 

No. Quick-Start only has benefits if it is enable= d by the applications that can indeed leverage it, which is a subset of all= TCP flows. If a host naively applies it to any TCP connection, there will = be no benefit as most Quick-Start requests will be rejected. So the endpoint has a strong incentive to enabl= e it only on these connections that actually leverage it. Actually doing th= is is a problem of its own. I have discussed this issue with AR/VR develope= rs 10 years ago and it was non-trivial by then. It would be interesting to learn what has changed since then in t= he application developer community.

 

> Which raises a complete different scalabilit= y challenge to TCP quickstart..

 

Yep. Quick-Start can be implemented in a router w= ithout per-flow state and thus scales e.g. on network processors. 10 years = ago we found that the key performance bottleneck in the fast path would be = the state-synchronization between the different cores of a network processor. But as Quick-Start does not pe= rform hard guarantees, this can be worked around.

 

I am not a hardware expert, any maybe state synch= ronization between many cores is cheaper these days. But I'd really like to= understand how hard QoS guarantees for single TCP connections would be ach= ieved e.g. on modern multi-core network processor (i.e., multiple TBit/s).

 

> This type of comparison discussion will go i= nto draft updates on our side..

>

> Would be interested in any more data points = about the history of TCP

> quickstart, eg: where it was observed in the= wild in deployments.

 

In my experiments 10 years ago, there was little = performance benefit of Quick-Start as compared to IW10, which was published= in RFC 6928. My experiments are published in http://www.ikr.uni-st= uttgart.de/Content/Publications/Archive/Sf_Diss_40112.pdf.<= /o:p>

 

I strongly suggest to compare new congestion cont= rol schemes tot CUBIC+IW10 as baseline, and to show how much performanc= e benefit one indeed gets, and at what risk and costs.

 

Michael

 

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/mmpB52310H589vP+HtTDE0cNipkh63JnhU0wJAetlEuyT3vu8xqrSnkSgoGDEcAnK2d9pZbmt0qFnBYn4V6romezOHT7qLc326zl6HCshwXedP3cxoRxt2mZFtbf6sXdRvsdP1ze/gUTQDPQoe0UICjWE4qOfB8qpmLZPSqXdHY3rjawY5x0nqVuv66aN4RYtL72/njFSJbmRVPQH31+HvnFIYABHZBy1i6WncACQ/qHlU+30dadVkKGbaBtZ4hnQvPKAGIZ6Do5BL1si3WR0I/kCTWolqfLV9zPag9IdmN48Ub44OQKPR32iTvpNsvZqVmEEA+9/25t7+tmn0SifuuiIBtbOxcCtIQNxh1QQOv4RSmfg89uQd0GNGNs/z8 spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/related; boundary="_004_VI1PR0701MB255831A406C1EA3493FD0EF193D70VI1PR0701MB2558_"; type="multipart/alternative" MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 745d8775-3367-4bdb-5481-08d58ada3c73 X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Mar 2018 01:07:06.4007 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0701MB2079 Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 01:07:14 -0000 --_004_VI1PR0701MB255831A406C1EA3493FD0EF193D70VI1PR0701MB2558_ Content-Type: multipart/alternative; boundary="_000_VI1PR0701MB255831A406C1EA3493FD0EF193D70VI1PR0701MB2558_" --_000_VI1PR0701MB255831A406C1EA3493FD0EF193D70VI1PR0701MB2558_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable As I wrote already, I believe there will be scenarios where the TCP Reno co= ngestion control will complete data transfers significantly faster than wha= t you propose, i.e., your proposal results in worse performance. I suggest to draw a picture with PIR>>CIR and a larger RTT. Then you will s= ee that there will be cases in which TCP Reno outperforms what you suggest.= Which raises the question why an application should setup a TCP session th= at will be slower than the default. Michael From: Lin Han [mailto:Lin.Han@huawei.com] Sent: Friday, March 16, 2018 2:00 AM To: Scharf, Michael (Nokia - DE/Stuttgart) ; Toer= less Eckert ; Gorry Fairhurst Cc: Thomas Nadeau ; tcpm@ietf.org; tsvwg@ietf.org;= tsvwg-chairs@ietf.org; Katsushi Kobayashi ; Yingzhen Qu Subject: RE: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101) Hi, Scarf For draft-han-tsvwg-cc, we have some assumptions 1. User application setup TCP session with a given PIR/CIR, 2. Network devices on the path will satisfy such expectation. In details, t= he traffic with the rate below CIR is always guaranteed to pass, and above = PIR will be dropped; If the rate is between PIR and CIR, the traffic may be= competing with others to get the resource. This draft try to propose what we should change for the current CC for abov= e scenarios, the picture below may explain more clearly for what is the dif= ference of new algorithm with reno: [cid:image001.png@01D3BCCB.793D7490] -----Original Message----- From: tsvwg [mailto:tsvwg-bounces@ietf.org] On Behalf Of Scharf, Michael (N= okia - DE/Stuttgart) Sent: Thursday, March 15, 2018 5:34 PM To: Toerless Eckert >; Gorry Fairhurst = > Cc: Thomas Nadeau >= ; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi = >; Yingzhen Qu > Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101) > TCP quickstart really relates IMHO primarily to > draft-han-6man-in-band- signaling-for-transport-qos, but not to > draft-han-tsvwg-cc. The latter one is This is wrong. Section 4.4 in RFC 4782 is very related to draft-han-tsvwg-c= c. Of specific interest is e.g. the handling of ssthresh. RFC 4782 also con= siders packet headers. > really meant to modify TCP assuming a known guaranteed CIR - whatever > mechanism is used to provide that guarantee. > > TCP quickstart is an interesting example for inband signaling, which > is what Lin's in-band-signaling draft does too. The main difference is > that our draft focusses on high-value traffic where per-flow state is > feasible and beneficial, if not necessary. And TCP quickstart seems more = targeted to ANY TCP flow. No. Quick-Start only has benefits if it is enabled by the applications that= can indeed leverage it, which is a subset of all TCP flows. If a host naiv= ely applies it to any TCP connection, there will be no benefit as most Quic= k-Start requests will be rejected. So the endpoint has a strong incentive t= o enable it only on these connections that actually leverage it. Actually d= oing this is a problem of its own. I have discussed this issue with AR/VR d= evelopers 10 years ago and it was non-trivial by then. It would be interest= ing to learn what has changed since then in the application developer commu= nity. > Which raises a complete different scalability challenge to TCP quickstart= .. Yep. Quick-Start can be implemented in a router without per-flow state and = thus scales e.g. on network processors. 10 years ago we found that the key = performance bottleneck in the fast path would be the state-synchronization = between the different cores of a network processor. But as Quick-Start does= not perform hard guarantees, this can be worked around. I am not a hardware expert, any maybe state synchronization between many co= res is cheaper these days. But I'd really like to understand how hard QoS g= uarantees for single TCP connections would be achieved e.g. on modern multi= -core network processor (i.e., multiple TBit/s). > This type of comparison discussion will go into draft updates on our side= .. > > Would be interested in any more data points about the history of TCP > quickstart, eg: where it was observed in the wild in deployments. In my experiments 10 years ago, there was little performance benefit of Qui= ck-Start as compared to IW10, which was published in RFC 6928. My experimen= ts are published in http://www.ikr.uni-stuttgart.de/Content/Publications/Ar= chive/Sf_Diss_40112.pdf. I strongly suggest to compare new congestion control schemes tot CUBIC+IW10= as baseline, and to show how much performance benefit one indeed gets, and= at what risk and costs. Michael --_000_VI1PR0701MB255831A406C1EA3493FD0EF193D70VI1PR0701MB2558_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

As I wrote already, I believe there will be scenario= s where the TCP Reno congestion control will complete data transfers signif= icantly faster than what you propose, i.e., your proposal results in worse = performance.

 

I suggest to draw a picture with PIR>>CIR and = a larger RTT. Then you will see that there will be cases in which TCP Reno = outperforms what you suggest. Which raises the question why an application = should setup a TCP session that will be slower than the default.

 

Michael

 

 

 

From: Lin Han [mailto:Lin.Han@huawei.com] Sent: Friday, March 16, 2018 2:00 AM
To: Scharf, Michael (Nokia - DE/Stuttgart) <michael.scharf@nokia.= com>; Toerless Eckert <tte@cs.fau.de>; Gorry Fairhurst <gorry@e= rg.abdn.ac.uk>
Cc: Thomas Nadeau <tnadeau@lucidvision.com>; tcpm@ietf.org; ts= vwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi <ikob@acm.org>= ;; Yingzhen Qu <yingzhen.qu@huawei.com>
Subject: RE: [tsvwg] inband signaling (was: Re: Agenda requests for = TSVWG@IETF101)

 

Hi, Scarf

 

For draft-han-tsvwg-cc, we have some assumptions<= o:p>

1. User application setup TCP session with a give= n PIR/CIR,

2. Network devices on the path will satisfy such = expectation. In details, the traffic with the rate below CIR is always guar= anteed to pass, and above PIR will be dropped; If the rate is between PIR a= nd CIR, the traffic may be competing with others to get the resource.

This draft try to propose what we should change f= or the current CC for above scenarios, the picture below may explain more c= learly for what is the difference of new algorithm with reno:

 

 

-----Original Message-----
From: tsvwg [mailto:tsvwg-bounces= @ietf.org] On Behalf Of Scharf, Michael (Nokia - DE/Stuttgart)
Sent: Thursday, March 15, 2018 5:34 PM
To: Toerless Eckert <tte@cs.fau.de&= gt;; Gorry Fairhurst <gorry@erg.= abdn.ac.uk>
Cc: Thomas Nadeau <tnadeau@lu= cidvision.com>; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@i= etf.org; Katsushi Kobayashi <ikob@ac= m.org>; Yingzhen Qu <yi= ngzhen.qu@huawei.com>
Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101)

 

> TCP quickstart really relates IMHO primarily= to

> draft-han-6man-in-band- signaling-for-transp= ort-qos, but not to

> draft-han-tsvwg-cc. The latter one is

 

This is wrong. Section 4.4 in RFC 4782 is very re= lated to draft-han-tsvwg-cc. Of specific interest is e.g. the handling of s= sthresh. RFC 4782 also considers packet headers.

 

> really meant to modify TCP assuming a known = guaranteed CIR - whatever

> mechanism is used to provide that guarantee.=

>

> TCP quickstart is an interesting example for= inband signaling, which

> is what Lin's in-band-signaling draft does t= oo. The main difference is

> that our draft focusses on high-value traffi= c where per-flow state is

> feasible and beneficial, if not necessary. A= nd TCP quickstart seems more targeted to ANY TCP flow.

 

No. Quick-Start only has benefits if it is enable= d by the applications that can indeed leverage it, which is a subset of all= TCP flows. If a host naively applies it to any TCP connection, there will = be no benefit as most Quick-Start requests will be rejected. So the endpoint has a strong incentive to enabl= e it only on these connections that actually leverage it. Actually doing th= is is a problem of its own. I have discussed this issue with AR/VR develope= rs 10 years ago and it was non-trivial by then. It would be interesting to learn what has changed since then in t= he application developer community.

 

> Which raises a complete different scalabilit= y challenge to TCP quickstart..

 

Yep. Quick-Start can be implemented in a router w= ithout per-flow state and thus scales e.g. on network processors. 10 years = ago we found that the key performance bottleneck in the fast path would be = the state-synchronization between the different cores of a network processor. But as Quick-Start does not pe= rform hard guarantees, this can be worked around.

 

I am not a hardware expert, any maybe state synch= ronization between many cores is cheaper these days. But I'd really like to= understand how hard QoS guarantees for single TCP connections would be ach= ieved e.g. on modern multi-core network processor (i.e., multiple TBit/s).

 

> This type of comparison discussion will go i= nto draft updates on our side..

>

> Would be interested in any more data points = about the history of TCP

> quickstart, eg: where it was observed in the= wild in deployments.

 

In my experiments 10 years ago, there was little = performance benefit of Quick-Start as compared to IW10, which was published= in RFC 6928. My experiments are published in http://www.ikr.uni-st= uttgart.de/Content/Publications/Archive/Sf_Diss_40112.pdf.<= /o:p>

 

I strongly suggest to compare new congestion cont= rol schemes tot CUBIC+IW10 as baseline, and to show how much performanc= e benefit one indeed gets, and at what risk and costs.

 

Michael

 

 

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(ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xmM8wA3E837I; Thu, 15 Mar 2018 19:01:48 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2813E1200B9; Thu, 15 Mar 2018 19:01:47 -0700 (PDT) Received: from lhreml704-cah.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id 68D2272557986; Fri, 16 Mar 2018 02:01:42 +0000 (GMT) Received: from SJCEML703-CHM.china.huawei.com (10.208.112.39) by lhreml704-cah.china.huawei.com (10.201.108.45) with Microsoft SMTP Server (TLS) id 14.3.382.0; Fri, 16 Mar 2018 02:01:43 +0000 Received: from SJCEML521-MBS.china.huawei.com ([169.254.2.168]) by SJCEML703-CHM.china.huawei.com ([169.254.5.179]) with mapi id 14.03.0382.000; Thu, 15 Mar 2018 19:01:31 -0700 From: Lin Han To: "Scharf, Michael (Nokia - DE/Stuttgart)" , Toerless Eckert , Gorry Fairhurst CC: Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" , Katsushi Kobayashi , Yingzhen Qu Thread-Topic: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) Thread-Index: AQHTvL6dNgq1fgunpk6VuHbKAe8Xt6PSB2hwgAB6pgD//5KtwA== Date: Fri, 16 Mar 2018 02:01:31 +0000 Message-ID: <1D30AF33624CDD4A99E8C395069A2A162CDBBA8E@sjceml521-mbs.china.huawei.com> References: <5A9BEB65.6010102@erg.abdn.ac.uk> <050065D2-5F2E-4E79-9BD1-E1DC03F13900@acm.org> <5AA79C2E.1040808@erg.abdn.ac.uk> <20180313164928.GA17042@faui40p.informatik.uni-erlangen.de> <1D30AF33624CDD4A99E8C395069A2A162CDBBA47@sjceml521-mbs.china.huawei.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.212.244.119] Content-Type: multipart/related; boundary="_004_1D30AF33624CDD4A99E8C395069A2A162CDBBA8Esjceml521mbschi_"; type="multipart/alternative" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 02:01:52 -0000 --_004_1D30AF33624CDD4A99E8C395069A2A162CDBBA8Esjceml521mbschi_ Content-Type: multipart/alternative; boundary="_000_1D30AF33624CDD4A99E8C395069A2A162CDBBA8Esjceml521mbschi_" --_000_1D30AF33624CDD4A99E8C395069A2A162CDBBA8Esjceml521mbschi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, Michael As described in the original draft draft-han-6man-in-band-signaling-for-tra= nsport-qos, the new method is not designed for the normal application that = current TCP works well. It does not try to replace or compete with TCP for = most of current applications. It is designed for the scenario that the regu= lar TCP cannot satisfy the requirement in terms of bandwidth or latency. I.= e, ultra-high bandwidth or ultra-short latency. For example, there is no networked AR/VR (with good quality) now since no n= etwork or transport technology can satisfy its unusual requirement (see det= ailed analysis in draft-han-iccrg-arvr-transport-problem-00). In order to p= rovide such service, SP may need to dramatically increase network, link cap= acity and even topology. Currently, a user may be only able to get such ser= vice by a leased line, but it is too expensive for most of people. When an application selects the PIR and CIR, it must know the consequence f= or the value. As you said, if PIR>>CIR, it means it's a very burst traffic,= and using new method may not make sense since user should know for the rat= e above CIR, the behavior will be almost same as regular reno, and above PI= R is worse than reno since it will be dropped. How to smartly select PIR/CIR is another topic and irrelevant to the CC alg= orithm. Regards Lin From: Scharf, Michael (Nokia - DE/Stuttgart) [mailto:michael.scharf@nokia.c= om] Sent: Thursday, March 15, 2018 6:07 PM To: Lin Han ; Toerless Eckert ; Gorry Fa= irhurst Cc: Thomas Nadeau ; tcpm@ietf.org; tsvwg@ietf.org;= tsvwg-chairs@ietf.org; Katsushi Kobayashi ; Yingzhen Qu Subject: RE: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101) As I wrote already, I believe there will be scenarios where the TCP Reno co= ngestion control will complete data transfers significantly faster than wha= t you propose, i.e., your proposal results in worse performance. I suggest to draw a picture with PIR>>CIR and a larger RTT. Then you will s= ee that there will be cases in which TCP Reno outperforms what you suggest.= Which raises the question why an application should setup a TCP session th= at will be slower than the default. Michael From: Lin Han [mailto:Lin.Han@huawei.com] Sent: Friday, March 16, 2018 2:00 AM To: Scharf, Michael (Nokia - DE/Stuttgart) >; Toerless Eckert >; Gorry Fairhurst = > Cc: Thomas Nadeau >= ; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi = >; Yingzhen Qu > Subject: RE: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101) Hi, Scarf For draft-han-tsvwg-cc, we have some assumptions 1. User application setup TCP session with a given PIR/CIR, 2. Network devices on the path will satisfy such expectation. In details, t= he traffic with the rate below CIR is always guaranteed to pass, and above = PIR will be dropped; If the rate is between PIR and CIR, the traffic may be= competing with others to get the resource. This draft try to propose what we should change for the current CC for abov= e scenarios, the picture below may explain more clearly for what is the dif= ference of new algorithm with reno: [cid:image001.png@01D3BC8D.57335970] -----Original Message----- From: tsvwg [mailto:tsvwg-bounces@ietf.org] On Behalf Of Scharf, Michael (N= okia - DE/Stuttgart) Sent: Thursday, March 15, 2018 5:34 PM To: Toerless Eckert >; Gorry Fairhurst = > Cc: Thomas Nadeau >= ; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi = >; Yingzhen Qu > Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101) > TCP quickstart really relates IMHO primarily to > draft-han-6man-in-band- signaling-for-transport-qos, but not to > draft-han-tsvwg-cc. The latter one is This is wrong. Section 4.4 in RFC 4782 is very related to draft-han-tsvwg-c= c. Of specific interest is e.g. the handling of ssthresh. RFC 4782 also con= siders packet headers. > really meant to modify TCP assuming a known guaranteed CIR - whatever > mechanism is used to provide that guarantee. > > TCP quickstart is an interesting example for inband signaling, which > is what Lin's in-band-signaling draft does too. The main difference is > that our draft focusses on high-value traffic where per-flow state is > feasible and beneficial, if not necessary. And TCP quickstart seems more = targeted to ANY TCP flow. No. Quick-Start only has benefits if it is enabled by the applications that= can indeed leverage it, which is a subset of all TCP flows. If a host naiv= ely applies it to any TCP connection, there will be no benefit as most Quic= k-Start requests will be rejected. So the endpoint has a strong incentive t= o enable it only on these connections that actually leverage it. Actually d= oing this is a problem of its own. I have discussed this issue with AR/VR d= evelopers 10 years ago and it was non-trivial by then. It would be interest= ing to learn what has changed since then in the application developer commu= nity. > Which raises a complete different scalability challenge to TCP quickstart= .. Yep. Quick-Start can be implemented in a router without per-flow state and = thus scales e.g. on network processors. 10 years ago we found that the key = performance bottleneck in the fast path would be the state-synchronization = between the different cores of a network processor. But as Quick-Start does= not perform hard guarantees, this can be worked around. I am not a hardware expert, any maybe state synchronization between many co= res is cheaper these days. But I'd really like to understand how hard QoS g= uarantees for single TCP connections would be achieved e.g. on modern multi= -core network processor (i.e., multiple TBit/s). > This type of comparison discussion will go into draft updates on our side= .. > > Would be interested in any more data points about the history of TCP > quickstart, eg: where it was observed in the wild in deployments. In my experiments 10 years ago, there was little performance benefit of Qui= ck-Start as compared to IW10, which was published in RFC 6928. My experimen= ts are published in http://www.ikr.uni-stuttgart.de/Content/Publications/Ar= chive/Sf_Diss_40112.pdf. I strongly suggest to compare new congestion control schemes tot CUBIC+IW10= as baseline, and to show how much performance benefit one indeed gets, and= at what risk and costs. Michael --_000_1D30AF33624CDD4A99E8C395069A2A162CDBBA8Esjceml521mbschi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi, Michael=

 

As described in the or= iginal draft draft-han-6man-in-band-signaling-for-transport-qos, the new me= thod is not designed for the normal application that current TCP works well= . It does not try to replace or compete with TCP for most of current applications. It is designed for the scenario= that the regular TCP cannot satisfy the requirement in terms of bandwidth = or latency. I.e, ultra-high bandwidth or ultra-short latency.

 

For example, there is = no networked AR/VR (with good quality) now since no network or transport te= chnology can satisfy its unusual requirement (see detailed analysis in draf= t-han-iccrg-arvr-transport-problem-00). In order to provide such service, SP may need to dramatically increase net= work, link capacity and even topology. Currently, a user may be only able t= o get such service by a leased line, but it is too expensive for most of pe= ople.

 

When an application se= lects the PIR and CIR, it must know the consequence for the value. As you s= aid, if PIR>>CIR, it means it’s a very burst traffic, and using= new method may not make sense since user should know for the rate above CIR, the behavior will be almost same as regular r= eno, and above PIR is worse than reno since it will be dropped.<= /span>

How to smartly select = PIR/CIR is another topic and irrelevant to the CC algorithm.

 

Regards

 

Lin<= /p>

 

From: Scharf, Michael (Nokia - DE/Stuttgart) = [mailto:michael.scharf@nokia.com]
Sent: Thursday, March 15, 2018 6:07 PM
To: Lin Han <Lin.Han@huawei.com>; Toerless Eckert <tte@cs.f= au.de>; Gorry Fairhurst <gorry@erg.abdn.ac.uk>
Cc: Thomas Nadeau <tnadeau@lucidvision.com>; tcpm@ietf.org; ts= vwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi <ikob@acm.org>= ;; Yingzhen Qu <yingzhen.qu@huawei.com>
Subject: RE: [tsvwg] inband signaling (was: Re: Agenda requests for = TSVWG@IETF101)

 

As I wrote already, I believe there will be scenario= s where the TCP Reno congestion control will complete data transfers signif= icantly faster than what you propose, i.e., your proposal results in worse = performance.

 

I suggest to draw a picture with PIR>>CIR and = a larger RTT. Then you will see that there will be cases in which TCP Reno = outperforms what you suggest. Which raises the question why an application = should setup a TCP session that will be slower than the default.

 

Michael

 

 

 

From: Lin Han [mailto:Lin.Han@huawei.com]
Sent: Friday, March 16, 2018 2:00 AM
To: Scharf, Michael (Nokia - DE/Stuttgart) <michael.scharf@nokia.com>; Toerless Eckert &l= t;tte@cs.fau.de>; Gorry Fairhurst &= lt;gorry@erg.abdn.ac.uk>
Cc: Thomas Nadeau <tna= deau@lucidvision.com>; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@i= etf.org; Katsushi Kobayashi <ikob@ac= m.org>; Yingzhen Qu <yi= ngzhen.qu@huawei.com>
Subject: RE: [tsvwg] inband signaling (was: Re: Agenda requests for = TSVWG@IETF101)

 

Hi, Scarf

 

For draft-han-tsvwg-cc, we have some assumptions<= o:p>

1. User application setup TCP session with a give= n PIR/CIR,

2. Network devices on the path will satisfy such = expectation. In details, the traffic with the rate below CIR is always guar= anteed to pass, and above PIR will be dropped; If the rate is between PIR a= nd CIR, the traffic may be competing with others to get the resource.

This draft try to propose what we should change f= or the current CC for above scenarios, the picture below may explain more c= learly for what is the difference of new algorithm with reno:

3D"cid:=

 

 

-----Original Message-----
From: tsvwg [mailto:tsvwg-bounces= @ietf.org] On Behalf Of Scharf, Michael (Nokia - DE/Stuttgart)
Sent: Thursday, March 15, 2018 5:34 PM
To: Toerless Eckert <tte@cs.fau.de&= gt;; Gorry Fairhurst <gorry@erg.= abdn.ac.uk>
Cc: Thomas Nadeau <tnadeau@lu= cidvision.com>; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@i= etf.org; Katsushi Kobayashi <ikob@ac= m.org>; Yingzhen Qu <yi= ngzhen.qu@huawei.com>
Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101)

 

> TCP quickstart really relates IMHO primarily= to

> draft-han-6man-in-band- signaling-for-transp= ort-qos, but not to

> draft-han-tsvwg-cc. The latter one is

 

This is wrong. Section 4.4 in RFC 4782 is very re= lated to draft-han-tsvwg-cc. Of specific interest is e.g. the handling of s= sthresh. RFC 4782 also considers packet headers.

 

> really meant to modify TCP assuming a known = guaranteed CIR - whatever

> mechanism is used to provide that guarantee.=

>

> TCP quickstart is an interesting example for= inband signaling, which

> is what Lin's in-band-signaling draft does t= oo. The main difference is

> that our draft focusses on high-value traffi= c where per-flow state is

> feasible and beneficial, if not necessary. A= nd TCP quickstart seems more targeted to ANY TCP flow.

 

No. Quick-Start only has benefits if it is enable= d by the applications that can indeed leverage it, which is a subset of all= TCP flows. If a host naively applies it to any TCP connection, there will = be no benefit as most Quick-Start requests will be rejected. So the endpoint has a strong incentive to enabl= e it only on these connections that actually leverage it. Actually doing th= is is a problem of its own. I have discussed this issue with AR/VR develope= rs 10 years ago and it was non-trivial by then. It would be interesting to learn what has changed since then in t= he application developer community.

 

> Which raises a complete different scalabilit= y challenge to TCP quickstart..

 

Yep. Quick-Start can be implemented in a router w= ithout per-flow state and thus scales e.g. on network processors. 10 years = ago we found that the key performance bottleneck in the fast path would be = the state-synchronization between the different cores of a network processor. But as Quick-Start does not pe= rform hard guarantees, this can be worked around.

 

I am not a hardware expert, any maybe state synch= ronization between many cores is cheaper these days. But I'd really like to= understand how hard QoS guarantees for single TCP connections would be ach= ieved e.g. on modern multi-core network processor (i.e., multiple TBit/s).

 

> This type of comparison discussion will go i= nto draft updates on our side..

>

> Would be interested in any more data points = about the history of TCP

> quickstart, eg: where it was observed in the= wild in deployments.

 

In my experiments 10 years ago, there was little = performance benefit of Quick-Start as compared to IW10, which was published= in RFC 6928. My experiments are published in http://www.ikr.uni-st= uttgart.de/Content/Publications/Archive/Sf_Diss_40112.pdf.<= /o:p>

 

I strongly suggest to compare new congestion cont= rol schemes tot CUBIC+IW10 as baseline, and to show how much performanc= e benefit one indeed gets, and at what risk and costs.

 

Michael

 

 

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by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YW3lm6R0DK5U; Thu, 15 Mar 2018 19:58:43 -0700 (PDT) Received: from mail-pl0-x229.google.com (mail-pl0-x229.google.com [IPv6:2607:f8b0:400e:c01::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7459B126DFB; Thu, 15 Mar 2018 19:58:43 -0700 (PDT) Received: by mail-pl0-x229.google.com with SMTP id ay1-v6so5083888plb.7; Thu, 15 Mar 2018 19:58:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=/IuyZ2yQRuJbjc9Ojin92BzVOfJOAD4SLvd/qlQB65s=; b=GjnYj1fSo+RJ8b6h3b/uITlL7FXZI9/Ic2fCBkTzSLs7jI0LpsvIaCEGQ/aaUV4dPS 530jJ6yo2j7m8GparDIOtrjBfYuTv5N9w1FukLkDXHRCD9HZGO8uYLVDFZhFZ2AKDa7n 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AG47ELv/EgfIzTwfqfGW+VwsxxeJGKR+zT3FNUlSCidUy2Jxx9rNvNe96PIQyLL6yfpBIUdrD2SUMA== X-Received: by 2002:a17:902:b2c6:: with SMTP id x6-v6mr258649plw.298.1521169123083; Thu, 15 Mar 2018 19:58:43 -0700 (PDT) Received: from [192.168.178.30] ([118.148.72.177]) by smtp.gmail.com with ESMTPSA id e16sm13558314pfb.157.2018.03.15.19.58.39 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 15 Mar 2018 19:58:42 -0700 (PDT) Sender: Brian Carpenter To: Lin Han , Ingemar Johansson S , "tte@cs.fau.de" Cc: "tcpm@ietf.org" , "tsvwg@ietf.org" , "'iccrg@irtf.org'" References: <1D30AF33624CDD4A99E8C395069A2A162CDBB467@sjceml521-mbs.china.huawei.com> <1D30AF33624CDD4A99E8C395069A2A162CDBBA0E@sjceml521-mbs.china.huawei.com> From: Brian E Carpenter Message-ID: Date: Fri, 16 Mar 2018 15:58:46 +1300 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <1D30AF33624CDD4A99E8C395069A2A162CDBBA0E@sjceml521-mbs.china.huawei.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 02:58:45 -0000 Lin, On 16/03/2018 13:31, Lin Han wrote: ... > [LH] Same as using L4S, AQM still try to provide the faired resource allocation to all TCP flows by the rule of max-min fairness. This works well if the link capacity is big enough and all TCP flows will get what its application want. But when the link is congested, we cannot give some critical application the expected bandwidth, each flow will get the equal instantaneous bandwidth determined the total number of flows. To overcome this difficulty caused by TCP fairness, we have to reserve the resource for some application and exclude them from the resource sharing with others if the resource is not enough (treat those flow differently as others, i.e, different queuing/scheduler, etc). That's pretty much exactly the philosophy behind diffserv, with "flow" defined as "all packets marked with the same diffserv code point". The problem is scaling, and always has been. Diffserv sets a hard scaling limit at 64 classes. With modern technology, what value between 64 and infinity is a reasonable limit? (The discussion on scalability in the draft is rather brief.) Regards Brian From nobody Thu Mar 15 21:02:19 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 430A612D7EC for ; Thu, 15 Mar 2018 21:02:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.475 X-Spam-Level: X-Spam-Status: No, score=-2.475 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FAKE_REPLY_C=1.486, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FkJOOOFo9hSm for ; Thu, 15 Mar 2018 21:02:14 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7166A127078 for ; Thu, 15 Mar 2018 21:02:14 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 4811358C4BD; Fri, 16 Mar 2018 05:02:09 +0100 (CET) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 30092B0DD3E; Fri, 16 Mar 2018 05:02:09 +0100 (CET) Date: Fri, 16 Mar 2018 05:02:09 +0100 From: Toerless Eckert To: "Scharf, Michael (Nokia - DE/Stuttgart)" Cc: Thomas Nadeau , "tcpm@ietf.org" , Yingzhen Qu Message-ID: <20180316040208.GA9492@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: Re: [tcpm] [tsvwg] draft-han-tsvwg-cc X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 04:02:18 -0000 On Thu, Mar 15, 2018 at 11:42:08PM +0000, Scharf, Michael (Nokia - DE/Stutt= gart) wrote: > Authors, all, >=20 > I have read draft-han-tsvwg-cc-00. Below I have listed a number of questi= ons, which I believe would have to be addressed when discussing such a mech= anism in the IETF or IRTF. Thanks, much appreciated. Not a listed author, but let me give you some of my thoughts. I started trying to answer your questions individually, but it became IMHO too unstructured, long. So let me try instead some context setting and please tell me if you agree/disagree with the individual points. This is btw. just my personal opinions, the authors may disagree. Fundamentally, to comply to existing IETF QoS architecture, this method should be used in traffic classes with DS code points intended to be used with admission control/bandwidth management. Such as AF. or EF, or (forgot the others, but we'll look them up). Definitel not BE. Note: All the standards RFCs about those traffic classes do not mention whether they're intended for the Internet or not. Effectively they are almost never deployed on an Internet service, but on what we would call "controlled networks". But they don't=20 say this. Note 2: All those traffic class RFCs also are quite unspecific to the details of those bandwidth management/traffic control mechanisms. YOu asked for more details about e.g.: our in-band-signaling. On one hand i'd love to discuss it as much as possible, but just for the purpose of this CC draft, i think we should really only discuss any details of those bandwidth manaement/admission control that would impact the CC approach. See below for one example i have (ECN parameter). For example, the 10 year old draft-lochin-ietf-tsvwg-gtfrc was spec'ed with the example of AF and got as far as i understood it fairly positive WG feedback (just died because of authors changing jobs/priorities) (Given how it was TFRC based it was not primarily targeting TCP).=20 I would very much like to avoid changing the DSCP/PHP behavior of any classes, so this can not go into BE as a target solution. I would like to have a sentence like "any use in BE or other non-admission controled code points MUST stay within controlled networks" The reason to even mention this is just how SPs abuse DSCPs: inelastic video (non-congestion controlled) from service provider to their subs is often just using DSCP 0 for lazyness (overprovisioning). I mostly know this for multicast, but also VoD unicast (UDP). Even more so for voice (all inelastic codecs). So, if this approach is useful to those type of constrained networks... oh well... If i where to come up with a more complete TCP stack and API=20 description, i would probably default these type of flows to send with an AF class, and if the SP resets these to 0 instead of filtering them... see below. Having said this, the whole discussion about CC details is of course still core and all your questions are valid: I think we definitely should define a circuit breaker based on TCP behavior, based on the principles of RFC8084. Something like: - No TCP replies for more than N secs, break circuit - Only loss indication for more than M secs, fall back to CIR=3D0 behavior or break circuit (app based). Maybe also based on other TCP derived error recognition. Suggestions welcome. RFC8084 is so new, i have not seem good practices that could be applied to TCP. And i guess unlikely others have thought about this, given how there was no minimum CIR inelastic behavior for TCP.. The circuit breaker MUST IMHO be so strict it would pass Internet/BE muster - because of the unintended case where an SP resets the DSCP to 0 (instead of filtering them) and these flows do unintentionally get into the=20 Internet without any real admission control. Don't think=20 we have this case as a mandatory requirement (against screwed up SPs) in TSV review, but it would be really nice to meet. ECN was IMHO just an oversight of the -00. ECN MUST be used unchanged from existing recommendations when sending with more than CIR. When sending with less than CIR, it should be subject to a (binary) parameter whether or not to use ECN as an explicit congestion OAM indication resulting in a faster circuit breaker/revert to CIR=3D0, or whether to ignore it completely (and use the above loss/other TCP parameter based circuit breaker). Parameter really depends on how DSCP is set up: When you end up in a single queue / same drop priority with flows sending more than CIR, then you will see congestion even though you're sending below your admission approved CIR, so you need to ignore ECN. This is not an ideal case, but would happen if you only use external, eg: SDN/PCEP admission control schemes without e.g.: our in-band signaling (mileage with RSVP would vary based on how it controls the forwarding plane). I would definitely default ECN=3Don to ensure some integration with external bandwidth management explicitly turns it off when its known to break the scheme. To re-summarize: - Only use on bandwidth management compatible traffic classes - Constrain to controlled network otherwise - no redefinition of intended use of traffic classes (i think, need to revisit some AF details) - circuit breaker making it safe against use across ERRONEOUS use across non-controlled/Internete/BE. - ECN > CIR, ECN as parameter < CIR Of course, lots of still unanswered points from your side, but hope this is a good start. Cheers toerless P.S: You said no hat on, but i still see the pointy TCP wizard hat. Authors, all, I have read draft-han-tsvwg-cc-00. Below I have listed a number of question= s, which I believe would have to be addressed when discussing such a mechan= ism in the IETF or IRTF. This e-mail is strictly limited to the content of draft-han-tsvwg-cc-00. As= the draft does not specify how the CIR and PIR will actually be guaranteed= in the Internet, as well as how OAM signaling will work at Internet scale,= I will not comment here on these assumptions, except regarding requirement= s that strictly follow from the content of the I-D. The technical, economic= al, and regulation aspects of the assumptions are not in scope of TCPM and = they need to be discussed and solved elsewhere. Questions on draft-han-tsvwg-cc-00: 1/ The document seems to implicitly assume that network resources are reser= ved for *every* single TCP connection, right? * If that assumption is correct, it has to be spelt out explicitly in t= he text and it has to be noted that the underlying technology has to provid= e these capabilities *for every single* TCP connection. * Otherwise sentences like "after a TCP session is successfully initia= ted its congestion window (cwnd) jumps to CIR" would not make sense as mult= iple TCP connections within an traffic aggregate policied by CIR/PIR could = start to all send with CIR in parallel, which would trigger massive congest= ion. * As an example, in my reading draft-han-6man-in-band-signaling-for-tra= nsport-qos-00 would allow also reservations e.g. for aggregates of multiple= TCP connections. Such an operation mode seems not be compatible with the s= uggested mechanism in this I-D, as far as I understand. So the requirements= have to be made explicit. * Also, sentences such as "it is assumed that in bandwidth guaranteed n= etworks there have been network resources (bandwidths, queues etc.) dedicat= ed to the TCP flows" have to be corrected to specify that for the mechanism= in this draft to work correctly, the resources have to be guaranteed to ev= ery single TCP connection, not multiple "flows". 2/ Why does the document not rely on ECN (and not even reference ECN)? * For instance, the following requirement "It is important that OAM nee= ds to be able to detect if any device's buffer depth has exceeded the pre-= configured threshold, as this is an indication of potential congestion and = packet drop" could possibly be solved by ECN, no? * Even in case another OAM mechanism could be used in addition, a compr= ehensive TCP congestion control specification would have to also cover the = reaction to ECN marks as well, as well as the potential combination of feed= back results. Why is this missing? * Or would the document mandates that ECN MUST NOT be enabled for TCP c= onnections using this congestion control mechanism? 3/ Why does the document assume that congestion windows are calculated in s= egments and not in bytes? * RFC 5681 as well as many other RFCs calculate CWND in bytes. * However, I believe equations such "MinBandwidthWND =3D CIR * RTT/MSS"= or "MaxBandwidthWND =3D PIR * RTT/MSS" would return a window counted in MS= S segments. * Apart from the mismatch with the TCP standards, this sort of equation= might also requires a discussion on how to deal with integer division. 4/ How does the mechanism deal with IP and TCP header overhead? * TCP window sizes are about the TCP bytestream, while the actual IP pa= ckets sent by a TCP/IP stack will include an IP and TCP header. If one negl= ects the IP and TCP headers in the congestion window calculation, the resul= ting IP packet rate will be larger than the CIR and PIR seen in the TCP lay= er. This could result in packet drops if CIR and PIR are enforced e.g. for = IP packet length. * How will this problem be solved? Note that TCP (and also IP) can incl= ude header options, which results in variable header sizes. The number of T= CP options can be different for each TCP segment. How does this congestion = control mechanism correctly handle the headers and the options in IP and TC= P headers? 3/ How does the document deal with RTT variations? Is the assumption that t= he RTT is constant? * As far as I can tell from experiments, the RTT estimation is importan= t when applying a rate to window-based congestion control, which is what th= is document does. * Equations such "MinBandwidthWND =3D CIR * RTT/MSS" or "MaxBandwidthWN= D =3D PIR * RTT/MSS" only provide a window equivalent to the bandwidth-dela= y product of the path if the RTT sample is a correct prediction of the actu= al delay that the segments in flight will experience. How does the mechanis= m suggested in this document correctly predict the future RTT of the segmen= ts that are sent by the sender at a given point in time? * As an example, assume that the RTT at time t=3D10s is determined as 8= 0ms. Assume PIR =3D 10 Mbps and neglect the questions 3/ and 4/. Then this = document would probably assume that MaxBandwidthWND=3D100 kB is the bandwid= th delay product of the path during t=3D10s and t=3D10.08s, i.e., the maxim= um amount of outstanding data that can be sent in that time without drops (= or exceeding PIR). But assume that the actual round-trip delay of segments = has dropped to 40ms after the last RTT management, which means that the max= imum bandwidth delay product of the path at t=3D10s+epsilon is only 50 kB. = As a result, 50 Kb out of the congestion window would likely be dropped dur= ing t=3D10s and t=3D10.08s. And, due to the wrong RTT value, the effective = data rate of the sender could even be 20 Mbps, if the RTT mismatch is not d= etected immediately, or, e.g., if EWMA will delay the update of the weighte= d RTT parameter to the actual value. * So how does the proposed scheme to indeed determine a window that mee= ts the statement "This means a TCP sender is never allowed to send data at = a rate larger than PIR" if the RTT is not constant? Does this assume rate = pacing in the TCP sender for each TCP connection? 4/ How is it ensured that OAM alarms will reach the TCP sender in time in a= ll possible "random failure" cases? * As far as I understand, the following statement "When a sender receiv= es the third duplicated ACK, but no previous OAM congestion alarm has been = received, then it is considered that a segment is lost due to random failur= e not congestion. In this case the cwnd is not changed." mandates that an = OAM alarm is received prior to the third duplicate ACK *in all potential ca= ses* of congestion. If the OAM alarm got lost or delayed, this condition wo= uld imply that cwnd is not changed despite a segment has been dropped due t= o congestion, which would be a violation of fundamental Internet congestion= control principles. * Please expand on how this document ensures that cwnd will be reduces = in all potential cases when a packet gets dropped due to congestion, and wh= at requirements on the OAM alarms propagation follow from that. Of specific= interest are effects such as packet drops of packets relevant for the OAM = information, reordering of packets, asymmetric routing in forward and rever= se direction, use of multiple paths in parallel (ECMP), and the like. If th= e document makes assumption about the path such as in-order packet delivery= or the like, these assumptions need to be spelt out explicitly. * I understand that the OAM could be solved in different ways and the s= olution is independent of this document. But this document has to comprehen= sively specify all technical requirements that the OAM mechanism has to mee= t in order to ensure that every single packet drop due to congestion always= results in a cwnd reduction. Otherwise the algorithm has to change as it d= oes not safely prevent congestion. 5/ What is the expected performance benefit? Are there situations in which = performance will be worse than standard TCP congestion control? * The document does not contain any data of potential improvements or d= eteriorations as compared to the TCP standard congestion control. I assume = that such data will be presented to explain why this mechanism is proposed,= and what benefits it has. * As I have experimented with similar mechanisms quite a bit, I believe= there will be cases in which this congestion control mechanism will perfor= m worse than a TCP sender fully compliant to RFC 5681, when using the same = network path with CIR and PIR guarantees. I believe this document should an= alyze these cases and reason why a worse performance than standard TCP cong= estion control will be acceptable. IMHO this issue will specifically apply = in cases when PIR is significantly larger than CIR, and if the RTT is large= =2E As far as I can see, this draft mandates to start the data transfer in = congestion avoidance at CIR rate, which means that it can take many RTTs un= til the sender reaches the PIR. In contrast, RFC 5681 will run slow-start, = and RFC 5681 states that the "initial value of ssthresh SHOULD be set arbit= rarily high". This means that the TCP sender can reach PIR within few RTTs = and thus can send with full PIR speed, while a sender using draft-han-tsvwg= -cc-00 will send with a much lower speed CIR+epsilon. For short and medium-= sized data transfers, IMHO it can happen that the congestion control accord= ing to RFC 5681 will significantly outperform the mechanism suggested in th= is document, i.e., it will complete data transfers orders of magnitude fast= er even without any knowledge about CIR and PIR. Have the authors compared = this mechanism to the performance of RFC 5681? * Also, have the authors compared the performance of this mechanism as = compared to a modern TCP stack, which often use RFC 6928 (IW 10) and RFC 83= 12 (CUBIC)? In what cases has the suggested congestion control a better per= formance? I ask this because I have performed experiments 10 years ago with= congestion control schemes that have some similarity to what is suggested = here, and they also used knowledge about the path properties. In those expe= riments, it turned out to be quite difficult to design an algorithm that us= es knowledge about the path (such as CIR/PIR) and that outperforms CUBIC in= combination IW 10, even if such a stack is totally unaware of the path. Th= is has been discussed e.g. in ICCRG https://www.ietf.org/proceedings/73/sli= des/iccrg-2.pdf. As context, "more-start" in this document is somewhat simi= lar to what is proposed in this I-D (but applied to CUBIC), while the "init= ial-start" graphs somehow corresponds to what was later specified in RFC 69= 28 (IW 10) and RFC 8312 (CUBIC). 6/ For what application traffic patterns is this mechanism proposed? * The document states in Section 3 "... with the development of new app= lications, such as AR/VR". What properties do such applications have to lev= erage the mechanism suggested in this document? Is it possible to character= ize what the "new" requirements are, and how the suggested algorithm meets = these requirements? * Is it suggested to apply this congestion control to real-time media t= raffic over TCP? If so, what would be the benefit of using TCP in general a= nd of the specific mechanism compared to congestion control algorithm for s= uch traffic (e.g., the RMCAT working group)? This list of questions is not comprehensive, but I'll stop here. Regarding potential next steps of this document in the TCPM working group, = I believe that the applicable TCPM charter wording is: "In addition, TCPM m= ay document alternative TCP congestion control algorithms that are known to= be widely deployed, and that are considered safe for large-scale deploymen= t in the Internet." Until these prerequisites are fulfilled in the Internet= , in my view the document cannot be adopted in TCPM. Research could be perf= ormed in the IRTF, e.g., in ICCRG. 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DIR:OUT; SFP:1102; SCL:1; SRVR:VI1PR0701MB2174; H:VI1PR0701MB2558.eurprd07.prod.outlook.com; FPR:; SPF:None; PTR:InfoNoRecords; A:1; MX:1; LANG:en; received-spf: None (protection.outlook.com: nokia.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: qXv5ulEbmbjkMb3tBOWN5jyxDigyvx4izDWVPvu1kSR4K1kcf3Wemt9iOutziLYOIDpP2iABj4aqN6MTiRjT7nmrjRy14AwdsJhG/9/8KzeWvtsPej1pJKf1nU0tSqUaZItnAeedeDolvNKHJis98TEjwZQsWY6fXnjZgcAilc//HdTy8u6/PY93eyZlCRnmoe30rUFkE+U80wGUUBvH9brk6k4HljyCEpb3vf/X4lQ9Rb582DjJORfqhKkWdI9g5Ws7ZpvqVUPPMZeZNEnKifcq1wJZjRne1H3ukUuxHDgrtoEQsbrDOxH4dPBo+rUm74z4AYD3HPqLxkEffp/ZSzj47iTmPK2OzS24UYZfVeTDYxKqpW20F+m1vkUKB0nD spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/related; boundary="_004_VI1PR0701MB2558DAB3AF5AF8AF43DBA73393D70VI1PR0701MB2558_"; type="multipart/alternative" MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2dbacdb6-7f9b-4de0-9622-08d58b175f88 X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Mar 2018 08:24:44.5558 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0701MB2174 Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 08:24:53 -0000 --_004_VI1PR0701MB2558DAB3AF5AF8AF43DBA73393D70VI1PR0701MB2558_ Content-Type: multipart/alternative; boundary="_000_VI1PR0701MB2558DAB3AF5AF8AF43DBA73393D70VI1PR0701MB2558_" --_000_VI1PR0701MB2558DAB3AF5AF8AF43DBA73393D70VI1PR0701MB2558_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Lin, Thanks a lot. I read from your explanation that a leased line would solve t= he performance problem. Leased lines are offered by service providers alrea= dy. Have you compared the performance of your proposed TCP modification ove= r an existing leased line service of a service provider? And have you compa= red the result with a modern TCP stack with CUBIC, IW10, and the like runni= ng over the same service, without having to guess a PIR/CIR? For which case= s would your scheme provide a better service to the application compared to= what TCP can do today? I suggest to study real measurements to understand how much headroom for im= provement indeed exists, as compared to what TCP congestion control already= can do today without any new technology. For instance, a single TCP connection scales up to multiple 10 Gbps, i.e., = as far as I know it basically can reach the limit what a single computer ca= n process with current processors. TCP works very well over short latencies= since more than 20 years. Thanks Michael From: tsvwg [mailto:tsvwg-bounces@ietf.org] On Behalf Of Lin Han Sent: Friday, March 16, 2018 3:02 AM To: Scharf, Michael (Nokia - DE/Stuttgart) ; Toer= less Eckert ; Gorry Fairhurst Cc: Thomas Nadeau ; tcpm@ietf.org; tsvwg@ietf.org;= tsvwg-chairs@ietf.org; Katsushi Kobayashi ; Yingzhen Qu Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101) Hi, Michael As described in the original draft draft-han-6man-in-band-signaling-for-tra= nsport-qos, the new method is not designed for the normal application that = current TCP works well.. It does not try to replace or compete with TCP for= most of current applications. It is designed for the scenario that the reg= ular TCP cannot satisfy the requirement in terms of bandwidth or latency. I= .e, ultra-high bandwidth or ultra-short latency. For example, there is no networked AR/VR (with good quality) now since no n= etwork or transport technology can satisfy its unusual requirement (see det= ailed analysis in draft-han-iccrg-arvr-transport-problem-00). In order to p= rovide such service, SP may need to dramatically increase network, link cap= acity and even topology. Currently, a user may be only able to get such ser= vice by a leased line, but it is too expensive for most of people. When an application selects the PIR and CIR, it must know the consequence f= or the value. As you said, if PIR>>CIR, it means it's a very burst traffic,= and using new method may not make sense since user should know for the rat= e above CIR, the behavior will be almost same as regular reno, and above PI= R is worse than reno since it will be dropped. How to smartly select PIR/CIR is another topic and irrelevant to the CC alg= orithm. Regards Lin From: Scharf, Michael (Nokia - DE/Stuttgart) [mailto:michael.scharf@nokia.c= om] Sent: Thursday, March 15, 2018 6:07 PM To: Lin Han >; Toerless Ecker= t >; Gorry Fairhurst > Cc: Thomas Nadeau >= ; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi = >; Yingzhen Qu > Subject: RE: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101) As I wrote already, I believe there will be scenarios where the TCP Reno co= ngestion control will complete data transfers significantly faster than wha= t you propose, i.e., your proposal results in worse performance. I suggest to draw a picture with PIR>>CIR and a larger RTT. Then you will s= ee that there will be cases in which TCP Reno outperforms what you suggest.= Which raises the question why an application should setup a TCP session th= at will be slower than the default. Michael From: Lin Han [mailto:Lin.Han@huawei.com] Sent: Friday, March 16, 2018 2:00 AM To: Scharf, Michael (Nokia - DE/Stuttgart) >; Toerless Eckert >; Gorry Fairhurst = > Cc: Thomas Nadeau >= ; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi = >; Yingzhen Qu > Subject: RE: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101) Hi, Scarf For draft-han-tsvwg-cc, we have some assumptions 1. User application setup TCP session with a given PIR/CIR, 2. Network devices on the path will satisfy such expectation. In details, t= he traffic with the rate below CIR is always guaranteed to pass, and above = PIR will be dropped; If the rate is between PIR and CIR, the traffic may be= competing with others to get the resource. This draft try to propose what we should change for the current CC for abov= e scenarios, the picture below may explain more clearly for what is the dif= ference of new algorithm with reno: [cid:image001.png@01D3BC8D.57335970] -----Original Message----- From: tsvwg [mailto:tsvwg-bounces@ietf.org] On Behalf Of Scharf, Michael (N= okia - DE/Stuttgart) Sent: Thursday, March 15, 2018 5:34 PM To: Toerless Eckert >; Gorry Fairhurst = > Cc: Thomas Nadeau >= ; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi = >; Yingzhen Qu > Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101) > TCP quickstart really relates IMHO primarily to > draft-han-6man-in-band- signaling-for-transport-qos, but not to > draft-han-tsvwg-cc. The latter one is This is wrong. Section 4.4 in RFC 4782 is very related to draft-han-tsvwg-c= c. Of specific interest is e.g. the handling of ssthresh. RFC 4782 also con= siders packet headers. > really meant to modify TCP assuming a known guaranteed CIR - whatever > mechanism is used to provide that guarantee. > > TCP quickstart is an interesting example for inband signaling, which > is what Lin's in-band-signaling draft does too. The main difference is > that our draft focusses on high-value traffic where per-flow state is > feasible and beneficial, if not necessary. And TCP quickstart seems more = targeted to ANY TCP flow. No. Quick-Start only has benefits if it is enabled by the applications that= can indeed leverage it, which is a subset of all TCP flows. If a host naiv= ely applies it to any TCP connection, there will be no benefit as most Quic= k-Start requests will be rejected. So the endpoint has a strong incentive t= o enable it only on these connections that actually leverage it. Actually d= oing this is a problem of its own. I have discussed this issue with AR/VR d= evelopers 10 years ago and it was non-trivial by then. It would be interest= ing to learn what has changed since then in the application developer commu= nity. > Which raises a complete different scalability challenge to TCP quickstart= .. Yep. Quick-Start can be implemented in a router without per-flow state and = thus scales e.g. on network processors. 10 years ago we found that the key = performance bottleneck in the fast path would be the state-synchronization = between the different cores of a network processor. But as Quick-Start does= not perform hard guarantees, this can be worked around. I am not a hardware expert, any maybe state synchronization between many co= res is cheaper these days. But I'd really like to understand how hard QoS g= uarantees for single TCP connections would be achieved e.g. on modern multi= -core network processor (i.e., multiple TBit/s). > This type of comparison discussion will go into draft updates on our side= .. > > Would be interested in any more data points about the history of TCP > quickstart, eg: where it was observed in the wild in deployments. In my experiments 10 years ago, there was little performance benefit of Qui= ck-Start as compared to IW10, which was published in RFC 6928. My experimen= ts are published in http://www.ikr.uni-stuttgart.de/Content/Publications/Ar= chive/Sf_Diss_40112.pdf. I strongly suggest to compare new congestion control schemes tot CUBIC+IW10= as baseline, and to show how much performance benefit one indeed gets, and= at what risk and costs. Michael --_000_VI1PR0701MB2558DAB3AF5AF8AF43DBA73393D70VI1PR0701MB2558_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Lin,

 

Thanks a lot. I read from your explanation that a le= ased line would solve the performance problem. Leased lines are offered by = service providers already. Have you compared the performance of your propos= ed TCP modification over an existing leased line service of a service provider? And have you compared the resul= t with a modern TCP stack with CUBIC, IW10, and the like running over the s= ame service, without having to guess a PIR/CIR? For which cases would your = scheme provide a better service to the application compared to what TCP can do today?

 

I suggest to study real measurements to understand h= ow much headroom for improvement indeed exists, as compared to what TCP con= gestion control already can do today without any new technology.

 

For instance, a single TCP connection scales up to m= ultiple 10 Gbps, i.e., as far as I know it basically can reach the limit wh= at a single computer can process with current processors. TCP works very we= ll over short latencies since more than 20 years.

 

Thanks

 

Michael

 

 

From: tsvwg [mailto:tsvwg-bounces@ietf.org] <= b>On Behalf Of Lin Han
Sent: Friday, March 16, 2018 3:02 AM
To: Scharf, Michael (Nokia - DE/Stuttgart) <michael.scharf@nokia.= com>; Toerless Eckert <tte@cs.fau.de>; Gorry Fairhurst <gorry@e= rg.abdn.ac.uk>
Cc: Thomas Nadeau <tnadeau@lucidvision.com>; tcpm@ietf.org; ts= vwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi <ikob@acm.org>= ;; Yingzhen Qu <yingzhen.qu@huawei.com>
Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for = TSVWG@IETF101)

 

Hi, Michael=

 

As described in the or= iginal draft draft-han-6man-in-band-signaling-for-transport-qos, the new me= thod is not designed for the normal application that current TCP works well= .. It does not try to replace or compete with TCP for most of current applications. It is designed for the scenario= that the regular TCP cannot satisfy the requirement in terms of bandwidth = or latency. I.e, ultra-high bandwidth or ultra-short latency.

 

For example, there is = no networked AR/VR (with good quality) now since no network or transport te= chnology can satisfy its unusual requirement (see detailed analysis in draf= t-han-iccrg-arvr-transport-problem-00). In order to provide such service, SP may need to dramatically increase net= work, link capacity and even topology. Currently, a user may be only able t= o get such service by a leased line, but it is too expensive for most of pe= ople.

 

When an application se= lects the PIR and CIR, it must know the consequence for the value. As you s= aid, if PIR>>CIR, it means it’s a very burst traffic, and using= new method may not make sense since user should know for the rate above CIR, the behavior will be almost same as regular r= eno, and above PIR is worse than reno since it will be dropped.<= /span>

How to smartly select = PIR/CIR is another topic and irrelevant to the CC algorithm.

 

Regards

 

Lin<= /p>

 

From: Scharf, Michael (Nokia - DE/Stuttgart) = [mailto:michael.scharf@nokia.co= m]
Sent: Thursday, March 15, 2018 6:07 PM
To: Lin Han <Lin.Han@huawei= .com>; Toerless Eckert <tte@cs.f= au.de>; Gorry Fairhurst <= gorry@erg.abdn.ac.uk>
Cc: Thomas Nadeau <tna= deau@lucidvision.com>; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@i= etf.org; Katsushi Kobayashi <ikob@ac= m.org>; Yingzhen Qu <yi= ngzhen.qu@huawei.com>
Subject: RE: [tsvwg] inband signaling (was: Re: Agenda requests for = TSVWG@IETF101)

 

As I wrote already, I believe there will be scenario= s where the TCP Reno congestion control will complete data transfers signif= icantly faster than what you propose, i.e., your proposal results in worse = performance.

 

I suggest to draw a picture with PIR>>CIR and = a larger RTT. Then you will see that there will be cases in which TCP Reno = outperforms what you suggest. Which raises the question why an application = should setup a TCP session that will be slower than the default.

 

Michael

 

 

 

From: Lin Han [mailto:Lin.Han@huawei.com]
Sent: Friday, March 16, 2018 2:00 AM
To: Scharf, Michael (Nokia - DE/Stuttgart) <michael.scharf@nokia.com>; Toerless Eckert &l= t;tte@cs.fau.de>; Gorry Fairhurst &= lt;gorry@erg.abdn.ac.uk>
Cc: Thomas Nadeau <tna= deau@lucidvision.com>; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@i= etf.org; Katsushi Kobayashi <ikob@ac= m.org>; Yingzhen Qu <yi= ngzhen.qu@huawei.com>
Subject: RE: [tsvwg] inband signaling (was: Re: Agenda requests for = TSVWG@IETF101)

 

Hi, Scarf

 

For draft-han-tsvwg-cc, we have some assumptions<= o:p>

1. User application setup TCP session with a give= n PIR/CIR,

2. Network devices on the path will satisfy such = expectation. In details, the traffic with the rate below CIR is always guar= anteed to pass, and above PIR will be dropped; If the rate is between PIR a= nd CIR, the traffic may be competing with others to get the resource.

This draft try to propose what we should change f= or the current CC for above scenarios, the picture below may explain more c= learly for what is the difference of new algorithm with reno:

3D"cid:image001.png@01D3BC8D.57335970"

 

 

-----Original Message-----
From: tsvwg [mailto:tsvwg-bounces= @ietf.org] On Behalf Of Scharf, Michael (Nokia - DE/Stuttgart)
Sent: Thursday, March 15, 2018 5:34 PM
To: Toerless Eckert <tte@cs.fau.de&= gt;; Gorry Fairhurst <gorry@erg.= abdn.ac.uk>
Cc: Thomas Nadeau <tnadeau@lu= cidvision.com>; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@i= etf.org; Katsushi Kobayashi <ikob@ac= m.org>; Yingzhen Qu <yi= ngzhen.qu@huawei.com>
Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101)

 

> TCP quickstart really relates IMHO primarily= to

> draft-han-6man-in-band- signaling-for-transp= ort-qos, but not to

> draft-han-tsvwg-cc. The latter one is

 

This is wrong. Section 4.4 in RFC 4782 is very re= lated to draft-han-tsvwg-cc. Of specific interest is e.g. the handling of s= sthresh. RFC 4782 also considers packet headers.

 

> really meant to modify TCP assuming a known = guaranteed CIR - whatever

> mechanism is used to provide that guarantee.=

>

> TCP quickstart is an interesting example for= inband signaling, which

> is what Lin's in-band-signaling draft does t= oo. The main difference is

> that our draft focusses on high-value traffi= c where per-flow state is

> feasible and beneficial, if not necessary. A= nd TCP quickstart seems more targeted to ANY TCP flow.

 

No. Quick-Start only has benefits if it is enable= d by the applications that can indeed leverage it, which is a subset of all= TCP flows. If a host naively applies it to any TCP connection, there will = be no benefit as most Quick-Start requests will be rejected. So the endpoint has a strong incentive to enabl= e it only on these connections that actually leverage it. Actually doing th= is is a problem of its own. I have discussed this issue with AR/VR develope= rs 10 years ago and it was non-trivial by then. It would be interesting to learn what has changed since then in t= he application developer community.

 

> Which raises a complete different scalabilit= y challenge to TCP quickstart..

 

Yep. Quick-Start can be implemented in a router w= ithout per-flow state and thus scales e.g. on network processors. 10 years = ago we found that the key performance bottleneck in the fast path would be = the state-synchronization between the different cores of a network processor. But as Quick-Start does not pe= rform hard guarantees, this can be worked around.

 

I am not a hardware expert, any maybe state synch= ronization between many cores is cheaper these days. But I'd really like to= understand how hard QoS guarantees for single TCP connections would be ach= ieved e.g. on modern multi-core network processor (i.e., multiple TBit/s).

 

> This type of comparison discussion will go i= nto draft updates on our side..

>

> Would be interested in any more data points = about the history of TCP

> quickstart, eg: where it was observed in the= wild in deployments.

 

In my experiments 10 years ago, there was little = performance benefit of Quick-Start as compared to IW10, which was published= in RFC 6928. My experiments are published in http://www.ikr.uni-st= uttgart.de/Content/Publications/Archive/Sf_Diss_40112.pdf.<= /o:p>

 

I strongly suggest to compare new congestion cont= rol schemes tot CUBIC+IW10 as baseline, and to show how much performanc= e benefit one indeed gets, and at what risk and costs.

 

Michael

 

 

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OTiy0+wg1FSAa3AFO8gS6I7j0MNsPbEtkKCVrK9jn7aI/58wy1/ouxDs49iN3/1NFWWqurOtUgcm6oDc5wejY2G+Zfxa38vwoIgKkAzLBTgke+fAwJ1K7zsYtGMaoKVy1pE2wYBDwdbqguYZS5Lwp2NGASY+Mghmht6JDLg23eajE70SJFnXH6lFm25Fpqyzlti4f0CL8cRZOdO+FhNEzzyElcZawIFSf+ZiO07i5LIOX7YMOLFrJ3yoq4AOc5nBHNsRFUYs4UJVEOJFT7/DBVDYLJYqQr/3AS4zM/zr3qdCf76th1VOWhx3L45oRPIAieNorWgiswexl9KilBpPtWpICil/K+fEvdZP1jpbtt3glWCKDk75Bhnr2TMfxu92 spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3f95d880-d4aa-4a4f-48a9-08d58b44164c X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Mar 2018 13:44:48.9834 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1SPR00MB65 Archived-At: Subject: Re: [tcpm] [tsvwg] draft-han-tsvwg-cc X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 13:44:56 -0000 > > Authors, all, > > > > I have read draft-han-tsvwg-cc-00. Below I have listed a number of > questions, which I believe would have to be addressed when discussing suc= h > a mechanism in the IETF or IRTF. >=20 > Thanks, much appreciated. Not a listed author, but let me give you some o= f > my thoughts. >=20 > I started trying to answer your questions individually, but it became IMH= O > too unstructured, long. So let me try instead some context setting and pl= ease > tell me if you agree/disagree with the individual points. This is btw. ju= st my Your points seem not to be about my questions on why draft-han-tsvwg-cc-00 = would be better as compared to running today's TCP congestion control over = the same scenario, and how the congestion control would be ensured to work = properly. > personal opinions, the authors may disagree. >=20 > Fundamentally, to comply to existing IETF QoS architecture, this method > should be used in traffic classes with DS code points intended to be used > with admission control/bandwidth management. Such as AF. or EF, or > (forgot the others, but we'll look them up). Definitel not BE. My reading of the document is that it assumes that CIR and PIR applies to a= single TCP connection and CIR is guaranteed *for each connection*. So the = admission control and bandwidth management must apply for each TCP connecti= on using this congestion control scheme, not for traffic aggregates. This specifically means that TCP connections will have to be rejected by th= e network if they intent to use this congestion control mechanism but the C= IR cannot be guaranteed, or the network would have to ensure that the conge= stion control falls back to TCP Reno in that case. This has to be specified= , otherwise the congestion control is not safe. =20 > Note: All the standards RFCs about those traffic classes do not mention > whether they're intended for the Internet or not. > Effectively they are almost never deployed on an Internet service, but on > what we would call "controlled networks". But they don't say this. > > Note 2: All those traffic class RFCs also are quite unspecific to the det= ails of > those bandwidth management/traffic control mechanisms. YOu asked for > more details about e.g.: our in-band-signaling. On one hand i'd love to d= iscuss > it as much as possible, but just for the purpose of this CC draft, i thin= k we > should really only discuss any details of those bandwidth > manaement/admission control that would impact the CC approach. See > below for one example i have (ECN parameter). >=20 > For example, the 10 year old draft-lochin-ietf-tsvwg-gtfrc was spec'ed wi= th > the example of AF and got as far as i understood it fairly positive WG > feedback (just died because of authors changing jobs/priorities) (Given h= ow > it was TFRC based it was not primarily targeting TCP). >=20 > I would very much like to avoid changing the DSCP/PHP behavior of any > classes, so this can not go into BE as a target solution. I would like to= have a > sentence like "any use in BE or other non-admission controled code points > MUST stay within controlled networks" >=20 > The reason to even mention this is just how SPs abuse DSCPs: > inelastic video (non-congestion controlled) from service provider to thei= r > subs is often just using DSCP 0 for lazyness (overprovisioning). I mostly= know > this for multicast, but also VoD unicast (UDP). > Even more so for voice (all inelastic codecs). So, if this approach is us= eful to > those type of constrained networks... oh well... >=20 > If i where to come up with a more complete TCP stack and API description,= i > would probably default these type of flows to send with an AF class, and = if > the SP resets these to 0 instead of filtering them... see below. >=20 > Having said this, the whole discussion about CC details is of course stil= l core > and all your questions are > valid: >=20 > I think we definitely should define a circuit breaker based on TCP behavi= or, > based on the principles of RFC8084. The TCP congestion control already takes care of this, no? =20 > Something like: > - No TCP replies for more than N secs, break circuit > - Only loss indication for more than M secs, fall back > to CIR=3D0 behavior or break circuit (app based). This is basically the TCP RTO. > Maybe also based on other TCP derived error recognition. > Suggestions welcome. RFC8084 is so new, i have not seem good practices > that could be applied to TCP. And i guess unlikely others have thought ab= out > this, given how there was no minimum CIR inelastic behavior for TCP.. If the network guarantees a minimum CIR to a single TCP connection, the TCP= congestion control will fully use this CIR as long as there is no congesti= on, in particular if one uses a modern TCP stack with high-speed congestion= control, efficient error recovery (SACK), and possibly even ECN (to avoid = packet drops if PIR is reached, which can make sense for latency-sensitive = apps). So an inelastic application that needs at minimum CIR should work pe= rfectly with existing TCP over that path with CIR guarantees, right? And the same TCP congestion control will also work very well if for some re= ason CIR cannot be guaranteed in the network. That can e.g. occur even in a= network that can guarantee CIR and PIR, e.g., if there is network misconfi= guration. In that case, the app will need to throttle down their sending ra= te, but as the network does not deliver CIR, there is no alternative to red= uce the rate anyway. > The circuit breaker MUST IMHO be so strict it would pass Internet/BE must= er > - because of the unintended case where an SP resets the DSCP to 0 (instea= d > of filtering > them) and these flows do unintentionally get into the Internet without an= y > real admission control. Don't think we have this case as a mandatory > requirement (against screwed up SPs) in TSV review, but it would be reall= y > nice to meet. >=20 > ECN was IMHO just an oversight of the -00. ECN MUST be used unchanged > from existing recommendations when sending with more than CIR. >=20 > When sending with less than CIR, it should be subject to a (binary) param= eter > whether or not to use ECN as an explicit congestion OAM indication result= ing > in a faster circuit breaker/revert to CIR=3D0, or whether to ignore it co= mpletely > (and use the above loss/other TCP parameter based circuit breaker). That seems to be a different algorithm than what is currently in the draft.= The starting point for a discussion about congestion control is a complete= specification and measurement results. This could possibly also be done at= research conferences. =20 > Parameter really depends on how DSCP is set up: >=20 > When you end up in a single queue / same drop priority with flows sending > more than CIR, then you will see congestion even though you're sending > below your admission approved CIR, so you need to ignore ECN. This is not > an ideal case, but would happen if you only use external, > eg: SDN/PCEP admission control schemes without e.g.: > our in-band signaling (mileage with RSVP would vary based on how it contr= ols > the forwarding plane). I cannot follow why it would be appropriate to ignore ECN as in that case a= router is clearly congested.=20 As far as I recall as "TCP wizard", the acronyms "SDN" and "PCEP" have not = been mentioned in TCPM so far, albeit PCEP is a TCP-based protocol. As this= have not come up in TCPM so far, I would assume that the use of "SDN" and = "PCEP" technology could also work with the existing TCP standards. What do = I miss? > I would definitely default ECN=3Don to ensure some integration with exter= nal > bandwidth management explicitly turns it off when its known to break the > scheme. >=20 > To re-summarize: >=20 > - Only use on bandwidth management compatible traffic classes No, as far as I understand, draft-han-tsvwg-cc requires bandwidth managemen= t per TCP connection > - Constrain to controlled network otherwise No to "otherwise" > - no redefinition of intended use of traffic classes > (i think, need to revisit some AF details) No, out of my head per-TCP connection admission control would require chang= es in AF (but I don't recall for sure) > - circuit breaker making it safe against > use across ERRONEOUS use across non-controlled/Internete/BE. No, circuit breaker is not needed in TCP as long as applications are elasti= c. For totally unelastic traffic, the question would first be why to use TC= P first of all and I don't see this answered in the drafts. > - ECN > CIR, ECN as parameter < CIR No, at first sight that does not make sense but I would need to see a full = spec, measurement, etc.=20 Thanks Michael > Of course, lots of still unanswered points from your side, but hope this = is a > good start. >=20 > Cheers > toerless >=20 > P.S: You said no hat on, but i still see the pointy TCP wizard hat. >=20 > Authors, all, >=20 > I have read draft-han-tsvwg-cc-00. Below I have listed a number of > questions, which I believe would have to be addressed when discussing suc= h > a mechanism in the IETF or IRTF. >=20 > This e-mail is strictly limited to the content of draft-han-tsvwg-cc-00. = As the > draft does not specify how the CIR and PIR will actually be guaranteed in= the > Internet, as well as how OAM signaling will work at Internet scale, I wil= l not > comment here on these assumptions, except regarding requirements that > strictly follow from the content of the I-D. The technical, economical, a= nd > regulation aspects of the assumptions are not in scope of TCPM and they > need to be discussed and solved elsewhere. >=20 > Questions on draft-han-tsvwg-cc-00: >=20 > 1/ The document seems to implicitly assume that network resources are > reserved for *every* single TCP connection, right? >=20 >=20 > * If that assumption is correct, it has to be spelt out explicitly in= the text > and it has to be noted that the underlying technology has to provide thes= e > capabilities *for every single* TCP connection. > * Otherwise sentences like "after a TCP session is successfully init= iated its > congestion window (cwnd) jumps to CIR" would not make sense as multiple > TCP connections within an traffic aggregate policied by CIR/PIR could sta= rt to > all send with CIR in parallel, which would trigger massive congestion. > * As an example, in my reading draft-han-6man-in-band-signaling-for- > transport-qos-00 would allow also reservations e.g. for aggregates of > multiple TCP connections. Such an operation mode seems not be compatible > with the suggested mechanism in this I-D, as far as I understand. So the > requirements have to be made explicit. > * Also, sentences such as "it is assumed that in bandwidth guaranteed > networks there have been network resources (bandwidths, queues etc.) > dedicated to the TCP flows" have to be corrected to specify that for the > mechanism in this draft to work correctly, the resources have to be > guaranteed to every single TCP connection, not multiple "flows". >=20 > 2/ Why does the document not rely on ECN (and not even reference ECN)? >=20 >=20 > * For instance, the following requirement "It is important that OAM n= eeds > to be able to detect if any device's buffer depth has exceeded the pre- > configured threshold, as this is an indication of potential congestion an= d > packet drop" could possibly be solved by ECN, no? > * Even in case another OAM mechanism could be used in addition, a > comprehensive TCP congestion control specification would have to also cov= er > the reaction to ECN marks as well, as well as the potential combination o= f > feedback results. Why is this missing? > * Or would the document mandates that ECN MUST NOT be enabled for > TCP connections using this congestion control mechanism? >=20 > 3/ Why does the document assume that congestion windows are calculated > in segments and not in bytes? >=20 >=20 > * RFC 5681 as well as many other RFCs calculate CWND in bytes. > * However, I believe equations such "MinBandwidthWND =3D CIR * > RTT/MSS" or "MaxBandwidthWND =3D PIR * RTT/MSS" would return a window > counted in MSS segments. > * Apart from the mismatch with the TCP standards, this sort of equati= on > might also requires a discussion on how to deal with integer division. >=20 > 4/ How does the mechanism deal with IP and TCP header overhead? >=20 >=20 > * TCP window sizes are about the TCP bytestream, while the actual IP > packets sent by a TCP/IP stack will include an IP and TCP header. If one > neglects the IP and TCP headers in the congestion window calculation, the > resulting IP packet rate will be larger than the CIR and PIR seen in the = TCP > layer. This could result in packet drops if CIR and PIR are enforced e.g.= for IP > packet length. > * How will this problem be solved? Note that TCP (and also IP) can in= clude > header options, which results in variable header sizes. The number of TCP > options can be different for each TCP segment. How does this congestion > control mechanism correctly handle the headers and the options in IP and > TCP headers? >=20 > 3/ How does the document deal with RTT variations? Is the assumption that > the RTT is constant? >=20 >=20 > * As far as I can tell from experiments, the RTT estimation is import= ant > when applying a rate to window-based congestion control, which is what th= is > document does. > * Equations such "MinBandwidthWND =3D CIR * RTT/MSS" or > "MaxBandwidthWND =3D PIR * RTT/MSS" only provide a window equivalent to > the bandwidth-delay product of the path if the RTT sample is a correct > prediction of the actual delay that the segments in flight will experienc= e. How > does the mechanism suggested in this document correctly predict the futur= e > RTT of the segments that are sent by the sender at a given point in time? > * As an example, assume that the RTT at time t=3D10s is determined as= 80ms. > Assume PIR =3D 10 Mbps and neglect the questions 3/ and 4/. Then this > document would probably assume that MaxBandwidthWND=3D100 kB is the > bandwidth delay product of the path during t=3D10s and t=3D10.08s, i.e., = the > maximum amount of outstanding data that can be sent in that time without > drops (or exceeding PIR). But assume that the actual round-trip delay of > segments has dropped to 40ms after the last RTT management, which means > that the maximum bandwidth delay product of the path at t=3D10s+epsilon i= s > only 50 kB. As a result, 50 Kb out of the congestion window would likely = be > dropped during t=3D10s and t=3D10.08s. And, due to the wrong RTT value, t= he > effective data rate of the sender could even be 20 Mbps, if the RTT misma= tch > is not detected immediately, or, e.g., if EWMA will delay the update of t= he > weighted RTT parameter to the actual value. > * So how does the proposed scheme to indeed determine a window that > meets the statement "This means a TCP sender is never allowed to send dat= a > at a rate larger than PIR" if the RTT is not constant? Does this assume = rate > pacing in the TCP sender for each TCP connection? >=20 > 4/ How is it ensured that OAM alarms will reach the TCP sender in time in= all > possible "random failure" cases? >=20 >=20 > * As far as I understand, the following statement "When a sender rece= ives > the third duplicated ACK, but no previous OAM congestion alarm has been > received, then it is considered that a segment is lost due to random fail= ure > not congestion. In this case the cwnd is not changed." mandates that an > OAM alarm is received prior to the third duplicate ACK *in all potential = cases* > of congestion. If the OAM alarm got lost or delayed, this condition would > imply that cwnd is not changed despite a segment has been dropped due to > congestion, which would be a violation of fundamental Internet congestion > control principles. > * Please expand on how this document ensures that cwnd will be reduce= s > in all potential cases when a packet gets dropped due to congestion, and > what requirements on the OAM alarms propagation follow from that. Of > specific interest are effects such as packet drops of packets relevant fo= r the > OAM information, reordering of packets, asymmetric routing in forward and > reverse direction, use of multiple paths in parallel (ECMP), and the like= . If the > document makes assumption about the path such as in-order packet delivery > or the like, these assumptions need to be spelt out explicitly. > * I understand that the OAM could be solved in different ways and the > solution is independent of this document. But this document has to > comprehensively specify all technical requirements that the OAM > mechanism has to meet in order to ensure that every single packet drop du= e > to congestion always results in a cwnd reduction. Otherwise the algorithm > has to change as it does not safely prevent congestion. >=20 > 5/ What is the expected performance benefit? Are there situations in whic= h > performance will be worse than standard TCP congestion control? >=20 >=20 > * The document does not contain any data of potential improvements or > deteriorations as compared to the TCP standard congestion control. I assu= me > that such data will be presented to explain why this mechanism is propose= d, > and what benefits it has. > * As I have experimented with similar mechanisms quite a bit, I belie= ve > there will be cases in which this congestion control mechanism will perfo= rm > worse than a TCP sender fully compliant to RFC 5681, when using the same > network path with CIR and PIR guarantees. I believe this document should > analyze these cases and reason why a worse performance than standard TCP > congestion control will be acceptable. IMHO this issue will specifically = apply in > cases when PIR is significantly larger than CIR, and if the RTT is large.= As far as > I can see, this draft mandates to start the data transfer in congestion > avoidance at CIR rate, which means that it can take many RTTs until the > sender reaches the PIR. In contrast, RFC 5681 will run slow-start, and RF= C > 5681 states that the "initial value of ssthresh SHOULD be set arbitrarily= high". > This means that the TCP sender can reach PIR within few RTTs and thus can > send with full PIR speed, while a sender using draft-han-tsvwg-cc-00 will > send with a much lower speed CIR+epsilon. For short and medium-sized data > transfers, IMHO it can happen that the congestion control according to RF= C > 5681 will significantly outperform the mechanism suggested in this > document, i.e., it will complete data transfers orders of magnitude faste= r > even without any knowledge about CIR and PIR. Have the authors compared > this mechanism to the performance of RFC 5681? > * Also, have the authors compared the performance of this mechanism a= s > compared to a modern TCP stack, which often use RFC 6928 (IW 10) and RFC > 8312 (CUBIC)? In what cases has the suggested congestion control a better > performance? I ask this because I have performed experiments 10 years ago > with congestion control schemes that have some similarity to what is > suggested here, and they also used knowledge about the path properties. I= n > those experiments, it turned out to be quite difficult to design an algor= ithm > that uses knowledge about the path (such as CIR/PIR) and that outperforms > CUBIC in combination IW 10, even if such a stack is totally unaware of th= e > path. This has been discussed e.g. in ICCRG > https://www.ietf.org/proceedings/73/slides/iccrg-2.pdf. As context, "more= - > start" in this document is somewhat similar to what is proposed in this I= -D > (but applied to CUBIC), while the "initial-start" graphs somehow correspo= nds > to what was later specified in RFC 6928 (IW 10) and RFC 8312 (CUBIC). >=20 > 6/ For what application traffic patterns is this mechanism proposed? >=20 >=20 > * The document states in Section 3 "... with the development of new > applications, such as AR/VR". What properties do such applications have t= o > leverage the mechanism suggested in this document? Is it possible to > characterize what the "new" requirements are, and how the suggested > algorithm meets these requirements? > * Is it suggested to apply this congestion control to real-time media= traffic > over TCP? If so, what would be the benefit of using TCP in general and of= the > specific mechanism compared to congestion control algorithm for such traf= fic > (e.g., the RMCAT working group)? >=20 > This list of questions is not comprehensive, but I'll stop here. >=20 > Regarding potential next steps of this document in the TCPM working group= , > I believe that the applicable TCPM charter wording is: "In addition, TCPM= may > document alternative TCP congestion control algorithms that are known to > be widely deployed, and that are considered safe for large-scale deployme= nt > in the Internet." Until these prerequisites are fulfilled in the Internet= , in my > view the document cannot be adopted in TCPM. Research could be > performed in the IRTF, e.g., in ICCRG. >=20 > Thanks >=20 > Michael (with no hat on) From nobody Fri Mar 16 08:09:31 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3FB521200F1 for ; Thu, 15 Mar 2018 22:50:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.888 X-Spam-Level: X-Spam-Status: No, score=-1.888 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DC_PNG_UNO_LARGO=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, T_KAM_HTML_FONT_INVALID=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VOgfk-JK7iLs for ; Thu, 15 Mar 2018 22:50:48 -0700 (PDT) Received: from mail-qt0-x22c.google.com (mail-qt0-x22c.google.com [IPv6:2607:f8b0:400d:c0d::22c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2D664124BFA for ; Thu, 15 Mar 2018 22:50:48 -0700 (PDT) Received: by mail-qt0-x22c.google.com with SMTP id y6so9767231qtm.7 for ; Thu, 15 Mar 2018 22:50:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=dllmU6CoR0U1exNacObMSgCRX8jU6gTOIuuW74qs1cU=; b=OGnsRocvVOMyl/c4W1Q3yT/Fsd1Qmx6zer6WQob4F/t7Gci0/RMfPWEeXS3HEubMRj clp+0RNjygxiXQZysx2/z9AlylksY/FUTVhd47cYe6Hm7kQBryoFpawYpj1d4mXQuLmO NCmm9uCowb7KfqEAb6dJokxaqF6OEN8QtqHIyc6c+bLM88aPTSemXyxN9fZ+gjNaUmIW 7qWPEFDDqN9J3JfOX/oG9Q1qgObhM0NoRrCjXSB+hkKZYseSf9e1coyhQS8cbSlt72FG SUxyXhfhgikBmVzOIcMtBbep7ebojNECFcp3x3CCgEnvyy0BIM7b7fI/bl/P+aTPxaiL GDrg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=dllmU6CoR0U1exNacObMSgCRX8jU6gTOIuuW74qs1cU=; b=Cm6rtVGfSRuhD2qJZ8DiGpyLFT5ktZBlYFOu36YBX06eeA20/D4A2c1i9m88ZSboxp N6tQ8lD9C2b3G+i4EmGEhVYMf9+X8Y0DuhhfWsTkkuHXxsvcGpmsYSIDdsXnZ04LJ3A2 nTQOT1hk8ExIbipTyLkAP3VhSWa1USXRhkOY2tfz79ZGWQw86jkD+RcMrd2upQ6Wk56W W4fuMZZ28yECd+4Pn7qrMyEwrwmMXPHb7c0ffEHc9jmkWSkfWt62VJGMx6gFL6LutBEX QT6Bjqm+DqHYZDyrqJ6XBAtOZfUmxpj+LkWUbJruc82276NOZGlpm5QSP1Oy+1C1i5E5 djVg== X-Gm-Message-State: AElRT7GZLFgrkeKpdjwXJgU7h/rowAtZeWoUcqo4A6CNmrXHeto3+aKR LuSmArFU0ygI8/kvJbmROgfMcvRvh+Q2n4cxsGsCCA== X-Google-Smtp-Source: AG47ELtuplXwTUfp9Q4TFZaoC34o3eC2ZmzjoCxMPtU+UfDjifrEM/pln8ZtKevTgNppXF79YXc819vVgFrnHhePCJ0= X-Received: by 10.237.46.196 with SMTP id k62mr788656qtd.291.1521179447094; Thu, 15 Mar 2018 22:50:47 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.26.135 with HTTP; Thu, 15 Mar 2018 22:50:46 -0700 (PDT) In-Reply-To: <1D30AF33624CDD4A99E8C395069A2A162CDBBA8E@sjceml521-mbs.china.huawei.com> References: <5A9BEB65.6010102@erg.abdn.ac.uk> <050065D2-5F2E-4E79-9BD1-E1DC03F13900@acm.org> <5AA79C2E.1040808@erg.abdn.ac.uk> <20180313164928.GA17042@faui40p.informatik.uni-erlangen.de> <1D30AF33624CDD4A99E8C395069A2A162CDBBA47@sjceml521-mbs.china.huawei.com> <1D30AF33624CDD4A99E8C395069A2A162CDBBA8E@sjceml521-mbs.china.huawei.com> From: Tom Herbert Date: Thu, 15 Mar 2018 22:50:46 -0700 Message-ID: To: Lin Han Cc: "Scharf, Michael (Nokia - DE/Stuttgart)" , Toerless Eckert , Gorry Fairhurst , Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" , Katsushi Kobayashi , Yingzhen Qu Content-Type: multipart/related; boundary="94eb2c122ab095a3f9056781304f" Archived-At: X-Mailman-Approved-At: Fri, 16 Mar 2018 08:09:30 -0700 Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 05:50:52 -0000 --94eb2c122ab095a3f9056781304f Content-Type: multipart/alternative; boundary="94eb2c122ab095a3f7056781304e" --94eb2c122ab095a3f7056781304e Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, Mar 15, 2018 at 7:01 PM, Lin Han wrote: > Hi, Michael > > > > As described in the original draft draft-han-6man-in-band-signaling-for-t= ransport-qos, > the new method is not designed for the normal application that current TC= P > works well.. It does not try to replace or compete with TCP for most of > current applications. It is designed for the scenario that the regular TC= P > cannot satisfy the requirement in terms of bandwidth or latency. I.e, > ultra-high bandwidth or ultra-short latency. > > > Hi Lin, The draft does seem to be TCP centric. You might want to look at FAST (draft-herbert-fast-00). It's similar in that it uses extension headers for network signaling of things such as QoS, but is designed to be completely transport protocol agnostic. In fact one of the goals of FAST is to not have the network perform DPI to extract 5-tuples any more. With the use of non-TCP protocols or increased use of encryption (tunnel mode IPsec) the need or ability for the network to do DPI hopefully decreases (IMO a good thing since DPI tends to be a source of protocol ossification). We still want the same functionality though which is what FAST tries to provide. Tom > For example, there is no networked AR/VR (with good quality) now since no > network or transport technology can satisfy its unusual requirement (see > detailed analysis in draft-han-iccrg-arvr-transport-problem-00). In order > to provide such service, SP may need to dramatically increase network, li= nk > capacity and even topology. Currently, a user may be only able to get suc= h > service by a leased line, but it is too expensive for most of people. > > > > When an application selects the PIR and CIR, it must know the consequence > for the value. As you said, if PIR>>CIR, it means it=E2=80=99s a very bur= st > traffic, and using new method may not make sense since user should know f= or > the rate above CIR, the behavior will be almost same as regular reno, and > above PIR is worse than reno since it will be dropped. > > How to smartly select PIR/CIR is another topic and irrelevant to the CC > algorithm. > > > > Regards > > > > Lin > > > > *From:* Scharf, Michael (Nokia - DE/Stuttgart) [mailto: > michael.scharf@nokia.com] > *Sent:* Thursday, March 15, 2018 6:07 PM > *To:* Lin Han ; Toerless Eckert ; > Gorry Fairhurst > *Cc:* Thomas Nadeau ; tcpm@ietf.org; > tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi ; > Yingzhen Qu > *Subject:* RE: [tsvwg] inband signaling (was: Re: Agenda requests for > TSVWG@IETF101) > > > > As I wrote already, I believe there will be scenarios where the TCP Reno > congestion control will complete data transfers significantly faster than > what you propose, i.e., your proposal results in worse performance. > > > > I suggest to draw a picture with PIR>>CIR and a larger RTT. Then you will > see that there will be cases in which TCP Reno outperforms what you > suggest. Which raises the question why an application should setup a TCP > session that will be slower than the default. > > > > Michael > > > > > > > > *From:* Lin Han [mailto:Lin.Han@huawei.com ] > *Sent:* Friday, March 16, 2018 2:00 AM > *To:* Scharf, Michael (Nokia - DE/Stuttgart) ; > Toerless Eckert ; Gorry Fairhurst > *Cc:* Thomas Nadeau ; tcpm@ietf.org; > tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi ; > Yingzhen Qu > *Subject:* RE: [tsvwg] inband signaling (was: Re: Agenda requests for > TSVWG@IETF101) > > > > Hi, Scarf > > > > For draft-han-tsvwg-cc, we have some assumptions > > 1. User application setup TCP session with a given PIR/CIR, > > 2. Network devices on the path will satisfy such expectation. In details, > the traffic with the rate below CIR is always guaranteed to pass, and abo= ve > PIR will be dropped; If the rate is between PIR and CIR, the traffic may = be > competing with others to get the resource. > > This draft try to propose what we should change for the current CC for > above scenarios, the picture below may explain more clearly for what is t= he > difference of new algorithm with reno: > > [image: cid:image001.png@01D3BC8D.57335970] > > > > > > -----Original Message----- > From: tsvwg [mailto:tsvwg-bounces@ietf.org ] On > Behalf Of Scharf, Michael (Nokia - DE/Stuttgart) > Sent: Thursday, March 15, 2018 5:34 PM > To: Toerless Eckert ; Gorry Fairhurst > > Cc: Thomas Nadeau ; tcpm@ietf.org; tsvwg@ietf.or= g; > tsvwg-chairs@ietf.org; Katsushi Kobayashi ; Yingzhen Qu < > yingzhen.qu@huawei.com> > Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for > TSVWG@IETF101) > > > > > TCP quickstart really relates IMHO primarily to > > > draft-han-6man-in-band- signaling-for-transport-qos, but not to > > > draft-han-tsvwg-cc. The latter one is > > > > This is wrong. Section 4.4 in RFC 4782 is very related to > draft-han-tsvwg-cc. Of specific interest is e.g. the handling of ssthresh= . > RFC 4782 also considers packet headers. > > > > > really meant to modify TCP assuming a known guaranteed CIR - whatever > > > mechanism is used to provide that guarantee. > > > > > > TCP quickstart is an interesting example for inband signaling, which > > > is what Lin's in-band-signaling draft does too. The main difference is > > > that our draft focusses on high-value traffic where per-flow state is > > > feasible and beneficial, if not necessary. And TCP quickstart seems mor= e > targeted to ANY TCP flow. > > > > No. Quick-Start only has benefits if it is enabled by the applications > that can indeed leverage it, which is a subset of all TCP flows. If a hos= t > naively applies it to any TCP connection, there will be no benefit as mos= t > Quick-Start requests will be rejected. So the endpoint has a strong > incentive to enable it only on these connections that actually leverage i= t. > Actually doing this is a problem of its own. I have discussed this issue > with AR/VR developers 10 years ago and it was non-trivial by then. It wou= ld > be interesting to learn what has changed since then in the application > developer community. > > > > > Which raises a complete different scalability challenge to TCP > quickstart.. > > > > Yep. Quick-Start can be implemented in a router without per-flow state an= d > thus scales e.g. on network processors. 10 years ago we found that the ke= y > performance bottleneck in the fast path would be the state-synchronizatio= n > between the different cores of a network processor. But as Quick-Start do= es > not perform hard guarantees, this can be worked around. > > > > I am not a hardware expert, any maybe state synchronization between many > cores is cheaper these days. But I'd really like to understand how hard Q= oS > guarantees for single TCP connections would be achieved e.g. on modern > multi-core network processor (i.e., multiple TBit/s). > > > > > This type of comparison discussion will go into draft updates on our > side.. > > > > > > Would be interested in any more data points about the history of TCP > > > quickstart, eg: where it was observed in the wild in deployments. > > > > In my experiments 10 years ago, there was little performance benefit of > Quick-Start as compared to IW10, which was published in RFC 6928. My > experiments are published in http://www.ikr.uni-stuttgart. > de/Content/Publications/Archive/Sf_Diss_40112.pdf. > > > > I strongly suggest to compare new congestion control schemes tot > CUBIC+IW10 as baseline, and to show how much performance benefit one inde= ed > gets, and at what risk and costs. > > > > Michael > > > > > --94eb2c122ab095a3f7056781304e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Thu, Mar 15, 2018 at 7:01 PM, Lin Han <Lin.Han@huawei.com>= wrote:

Hi, Michael<= /u>

=C2=A0

As described in= the original draft draft-han-6man-in-band-signaling-for-transport-qos= , the new method is not designed for the normal application that current TC= P works well.. It does not try to replace or compete with TCP for most of current applications. It is designed for the scenario= that the regular TCP cannot satisfy the requirement in terms of bandwidth = or latency. I.e, ultra-high bandwidth or ultra-short latency.

=C2=A0

Hi Lin,

The= draft does seem to be TCP centric. You might want to look at FAST (draft-h= erbert-fast-00). It's similar in that it uses extension headers for net= work signaling of things such as QoS, but is designed to be completely tran= sport protocol agnostic. In fact one of the goals of FAST is to not have th= e network perform DPI to extract 5-tuples any more. With the use of non-TCP= protocols or increased use of encryption (tunnel mode IPsec) the need or a= bility for the network to do DPI hopefully decreases (IMO a good thing sinc= e DPI tends to be a source of protocol ossification). We still want the sam= e functionality though which is what FAST tries to provide.

<= /div>
Tom
=C2=A0

=

For example, th= ere is no networked AR/VR (with good quality) now since no network or trans= port technology can satisfy its unusual requirement (see detailed analysis = in draft-han-iccrg-arvr-transport-problem-00). In order to provide such service, SP may need to dramatically increase net= work, link capacity and even topology. Currently, a user may be only able t= o get such service by a leased line, but it is too expensive for most of pe= ople.

=C2=A0

When an applica= tion selects the PIR and CIR, it must know the consequence for the value. A= s you said, if PIR>>CIR, it means it=E2=80=99s a very burst traffic, = and using new method may not make sense since user should know for the rate above CIR, the behavior will be almost same as regular r= eno, and above PIR is worse than reno since it will be dropped.

How to smartly = select PIR/CIR is another topic and irrelevant to the CC algorithm.<= u>

=C2=A0

Regards<= u>

=C2=A0

Lin

=C2=A0

From: Scharf, Michael (Nokia - DE/Stuttgart) = [mailto:micha= el.scharf@nokia.com]
Sent: Thursday, March 15, 2018 6:07 PM
To: Lin Han <Lin.Han@huawei.com>; Toerless Eckert <tte@cs.fau.de>; Gorry Fairhurst <gorry@erg.abdn.ac.uk<= /a>>
Cc: Thomas Nadeau <tnadeau@lucidvision.com>; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi <<= a href=3D"mailto:ikob@acm.org" target=3D"_blank">ikob@acm.org>; Ying= zhen Qu <yin= gzhen.qu@huawei.com>
Subject: RE: [tsvwg] inband signaling (was: Re: Agenda requests for = TSVWG@IETF101)

=C2=A0

As I wrote already, I believe there will be scenario= s where the TCP Reno congestion control will complete data transfers signif= icantly faster than what you propose, i.e., your proposal results in worse = performance.

=C2=A0

I suggest to draw a picture with PIR>>CIR and = a larger RTT. Then you will see that there will be cases in which TCP Reno = outperforms what you suggest. Which raises the question why an application = should setup a TCP session that will be slower than the default.

=C2=A0

Michael

=C2=A0

=C2=A0

=C2=A0

From: Lin Han [mailto:Lin.Han@huawei.com]
Sent: Friday, March 16, 2018 2:00 AM
To: Scharf, Michael (Nokia - DE/Stuttgart) <michael.scharf@nokia.com>; = Toerless Eckert <tte@= cs.fau.de>; Gorry Fairhurst <gorry@erg.abdn.ac.uk>
Cc: Thomas Nadeau <tnadeau@lucidvision.com>; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi <ikob@acm.org>; Yingzhen Qu <yingzhen.qu@huawei.com= >
Subject: RE: [tsvwg] inband signaling (was: Re: Agenda requests for = TSVWG@IETF101)

=C2=A0

Hi, Scarf

=C2=A0<= /p>

For draft-han-tsvwg-c= c, we have some assumptions

1. User application s= etup TCP session with a given PIR/CIR,

2. Network devices on= the path will satisfy such expectation. In details, the traffic with the r= ate below CIR is always guaranteed to pass, and above PIR will be dropped; = If the rate is between PIR and CIR, the traffic may be competing with others to get the resource.

This draft try to pro= pose what we should change for the current CC for above scenarios, the pict= ure below may explain more clearly for what is the difference of new algori= thm with reno:

3D"cid:image001.png=

=C2=A0<= /p>

=C2=A0<= /p>

-----Original Message= -----
From: tsvwg [ma= ilto:tsvwg-bounces@ietf.org] On Behalf Of Scharf, Michael (Nokia -= DE/Stuttgart)
Sent: Thursday, March 15, 2018 5:34 PM
To: Toerless Eckert <= tte@cs.fau.de>; Gorry Fairhurst <gorry@erg.abdn.ac.uk>
Cc: Thomas Nadeau <tnadeau@lucidvision.com>; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi <ikob@acm.org>; Yingzhen Qu <yingzhen.qu@huawei.com= >
Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@I= ETF101)

=C2=A0<= /p>

> TCP quickstart r= eally relates IMHO primarily to

> draft-han-6man-i= n-band- signaling-for-transport-qos, but not to

> draft-han-tsvwg-= cc. The latter one is

=C2=A0<= /p>

This is wrong. Sectio= n 4.4 in RFC 4782 is very related to draft-han-tsvwg-cc. Of specific intere= st is e.g. the handling of ssthresh. RFC 4782 also considers packet headers= .

=C2=A0<= /p>

> really meant to = modify TCP assuming a known guaranteed CIR - whatever

> mechanism is use= d to provide that guarantee.

>

> TCP quickstart i= s an interesting example for inband signaling, which

> is what Lin'= s in-band-signaling draft does too. The main difference is

> that our draft f= ocusses on high-value traffic where per-flow state is

> feasible and ben= eficial, if not necessary. And TCP quickstart seems more targeted to ANY TC= P flow.

=C2=A0<= /p>

No. Quick-Start only = has benefits if it is enabled by the applications that can indeed leverage = it, which is a subset of all TCP flows. If a host naively applies it to any= TCP connection, there will be no benefit as most Quick-Start requests will be rejected. So the endpoint has a strong incentive to enabl= e it only on these connections that actually leverage it. Actually doing th= is is a problem of its own. I have discussed this issue with AR/VR develope= rs 10 years ago and it was non-trivial by then. It would be interesting to learn what has changed since then in t= he application developer community.

=C2=A0<= /p>

> Which raises a c= omplete different scalability challenge to TCP quickstart..

=C2=A0<= /p>

Yep. Quick-Start can = be implemented in a router without per-flow state and thus scales e.g. on n= etwork processors. 10 years ago we found that the key performance bottlenec= k in the fast path would be the state-synchronization between the different cores of a network processor. But as Quick-Start does not pe= rform hard guarantees, this can be worked around.

=C2=A0<= /p>

I am not a hardware e= xpert, any maybe state synchronization between many cores is cheaper these = days. But I'd really like to understand how hard QoS guarantees for sin= gle TCP connections would be achieved e.g. on modern multi-core network processor (i.e., multiple TBit/s).

=C2=A0<= /p>

> This type of com= parison discussion will go into draft updates on our side..

>

> Would be interes= ted in any more data points about the history of TCP

> quickstart, eg: = where it was observed in the wild in deployments.

=C2=A0<= /p>

In my experiments 10 = years ago, there was little performance benefit of Quick-Start as compared = to IW10, which was published in RFC 6928. My experiments are published in http://www.ikr.uni-st= uttgart.de/Content/Publications/Archive/Sf_Diss_40112.pdf<= /a>.

=C2=A0<= /p>

I strongly suggest to= compare new congestion control schemes tot CUBIC+IW10 as baseline, and to = show how much performance benefit one indeed gets, and at what risk and cos= ts.

=C2=A0<= /p>

Michael=

=C2=A0<= /p>

=C2=A0<= /p>


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AAAgYgiAAAAAEUMABAAAiBSz/wKhZhMmWQvt4wAAAABJRU5ErkJggg== --94eb2c122ab095a3f9056781304f-- From nobody Fri Mar 16 09:23:54 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 62D2E12D868 for ; Fri, 16 Mar 2018 09:23:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 1.039 X-Spam-Level: * X-Spam-Status: No, score=1.039 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, GB_SUMOF=5, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zOkY3leOn3-g for ; Fri, 16 Mar 2018 09:23:44 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 61092126C83 for ; Fri, 16 Mar 2018 09:23:44 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 499EA58C4E5; Fri, 16 Mar 2018 17:23:39 +0100 (CET) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 2C24AB0DD48; Fri, 16 Mar 2018 17:23:39 +0100 (CET) Date: Fri, 16 Mar 2018 17:23:39 +0100 From: Toerless Eckert To: "Scharf, Michael (Nokia - DE/Stuttgart)" Cc: Thomas Nadeau , "tcpm@ietf.org" , Yingzhen Qu Message-ID: <20180316162338.GD18047@faui40p.informatik.uni-erlangen.de> References: <20180316040208.GA9492@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: Re: [tcpm] [tsvwg] draft-han-tsvwg-cc X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 16:23:49 -0000 On Fri, Mar 16, 2018 at 01:44:48PM +0000, Scharf, Michael (Nokia - DE/S So, thats what you then usetuttgart) wrote: > Your points seem not to be about my questions on why draft-han-tsvwg-cc-00 would be > a) better as compared to running today's TCP congestion control over the same scenario, > b) and how the congestion control would be ensured to work properly. I did say i was not answering all questions but tried to take it from the top, e.g.: how this fits into the existing IETF model for PHB/DSCPs and bandiwdth management/admission control. a) I had sent previously already an example use-case through which i tried to explain how we think this improves over todays CC in TCP, but i think that was not Cc'ed to CPM, but only when the discussions started on TSVWG, so let me repeat here: Many applications nowaday are elastic, but need a guaranteed minimum amount of bandwidth. In todays world of solely "fully elastic from 0 on" congestion model, we have a wide and not controllable resulting share under congestion. This share solely relies on how "aggressive" the CC is. between the least aggressive delay variation over to the most aggressive rate estimation approaches like BBR, we may have 10x share difference. Instead of calling such ranges fair and stop improving, i think it is more appropriate to figure out how one can move to a fairness model where its more about the resulting experience than the absolute bitrates alone: What i think is the most easy incremental step we can do is to combine the CC based bandwidth share with an admission controlled/bandwidth management ensured minimum bandwidth. As said in before, this is not a new concept, this was proposed in well received drafts even 10 years ago, but not trying to be applied to simply TCP proper. Yet even today, the mayority of applications even in applicable scenarios such as video streaming heavily rely on TCP. Consider simple scenarios such as TV-sets/STBs in the home. You have the $4000 huge living room TV set where you want to ensure 4k always. And you have a bunch of other cheaper TV sets, and you can't get 4k on all of them at the same time due to DSL speed limit. So you use an appropiate mean of admission control to figure out what guaranteed bandwidth will fit into the DSL link if worstcase all TV sets are active and come up e.g.: with a minimum guaranteed CIR of the 720p equivalent for all other TVs plus the 4k equivalent for the living room. During times when there is no contention, every TV gets the max bandwidth it supports (most may likely not be 4k anyhow), and during peak hours during the weekend, you have ensured the desired minimums for them. This approach well generalizes. You typically do have to scale up your bandwidth to support desirable minimums across peak hour maximum use anyhow, but you have no way to easily apply this to existing TCP using applicatoins today. This scheme introduces that ability. b) I am sure there will be a lot more details to look into re. the details of competing flows, but in basic, once the flow goes down to CIR it simply turns into an inelastic flow. To any flows that are operating at rates igher than CIR, this will just be as if operating on competing bandwidth reduced by the aggregate CIRs of CIR>0 flows. > > Fundamentally, to comply to existing IETF QoS architecture, this method > > should be used in traffic classes with DS code points intended to be used > > with admission control/bandwidth management. Such as AF. or EF, or > > (forgot the others, but we'll look them up). Definitel not BE. > > My reading of the document is that it assumes that CIR and PIR applies to a single TCP connection and CIR is guaranteed *for each connection*. So the admission control and bandwidth management must apply for each TCP connection using this congestion control scheme, not for traffic aggregates. a) CIR: Yes. As a starting point CIR is guaranteed:, this is exactly how it will look like to the TCP layer operating with the CIR > 0 modification. Nevertheless, this does not mean that the overall bandwidth management needs to be constrained to just that. There are quite useful more flexible use cases in which this CC scheme can be applied. For once, the admission control / bandwidth management scheme does not need to actually keep track of every active allocation. It just needs to make sure that the sum of all flows that are given a CIR will fit into the available bandwidth - and still leave headroom for any CIR=0 flows to reach an "experience fair" bitrate during peak hour. The notion of knowing all flows by name upfront may look silly from the average core internet perspective, but scenarios like a home network or detnet very often can life with such simplified admission control. Of course, when you do know that you can not support the peak hour sum of all possible CIR you need to have actually signaled admission control. We prefer inband, but of course any option (bandwidth broker == offpath PCEC, RSVP,...) is fair game. Another vector of flexibility are traffic groups. For example, in video conference with N participants, you typically only as man flows active as there are screens, eg: 3 out of N (e.g.: flow going to an MCU). So here you could have a bandwidth scheme that allocates to the application the bandwidth for for 3 streams (eg: 3 Mbps), but it does not matter which 3 out of the N streams are actively sending. Each participants TCP stream get a CIR of 1 Mbps, and the application control ensures that only 3 of the N flows are actively sending at the same time. (typically the last three who spoke). I don't want to bring any of this admission control complexity into the poor TCP layer, i am just trying to explain some examples of the feasible flexibility of admission / bandwidth management schemes on top of it. b) PIR: I think for the purpose of TCP behavior it is only a self-constrained to that PIR. As far as the CC draft is concerned, i think there should be no expectation of guarantees involved between CIR and PIR bitrates other than normal CC experience. Think of just an app indictaing CIR=0, PIR=X. It has full elsaticity (e.g.: no natural max limit, e.g.: file transfer) and uses this simply to be paced by TCP. Having said this, there are nice ways on how QoS/bandwidth management mechanisms could provide further guarantees. For example you could manage bandwidth through guaranteeing the CIR and providing per-flow weighted fair queues for the CIR..PIR range, where the weight is just (PIR-CIR). This would result in quite controlled relative upspeeding between CIR-PIR for those flows, so flow for whom the fair quality experience of N times that of anothe rflow would just need to have a 4 times larger (PIR-CIR) range. [ Note that per-flow weighted fair queues where used in products as late as the end of the 90th, e.g.: in Cisco IOS with RSVP, its just that the onset and prevalence of cheap silicone... and now silicone becomes intelligent enough to revive these solution scenarios. But as said in before, i would like to keep the CC spec as independent of these options as possible. ] > This specifically means that TCP connections will have to be rejected by the network if they intent to use this congestion control mechanism but the CIR cannot be guaranteed, or the network would have to ensure that the congestion control falls back to TCP Reno in that case. This has to be specified, otherwise the congestion control is not safe. Right. See above for how varied this can be though. Need to figure out how to keep it more pithy in the next text rev than my probably too extensive examples given here. I think th text should say that CIR can only be indicated by app to TCP if reasonable admission control /bandwidth for the classed used has succeeded. And TCP itself MUST revert to CIR=0 behavior or stop if OAM or circuit breaker mechanism indicate that the CIR is not actually available. > > I think we definitely should define a circuit breaker based on TCP behavior, > > based on the principles of RFC8084. > > The TCP congestion control already takes care of this, no? As discussed, when the rate goes below CIR, the flow becomes inelastic, and then we need to figure out how to disting randomn loss which we just want to correct from congestion loss which we would have to interpret as a circuit breaker. > > Something like: > > - No TCP replies for more than N secs, break circuit > > - Only loss indication for more than M secs, fall back > > to CIR=0 behavior or break circuit (app based). > > This is basically the TCP RTO. I think thats just one case. > > Maybe also based on other TCP derived error recognition. > > Suggestions welcome. RFC8084 is so new, i have not seem good practices > > that could be applied to TCP. And i guess unlikely others have thought about > > this, given how there was no minimum CIR inelastic behavior for TCP.. > > If the network guarantees a minimum CIR to a single TCP connection, the TCP congestion control will fully use this CIR as long as there is no congestion, in particular if one uses a modern TCP stack with high-speed congestion control, efficient error recovery (SACK), and possibly even ECN (to avoid packet drops if PIR is reached, which can make sense for latency-sensitive apps). So an inelastic application that needs at minimum CIR should work perfectly with existing TCP over that path with CIR guarantees, right? I think there are at least two points. One is the proposed behavior change when experiencing congestion at rate > CIR, falling back to just CIR, not below. The other one isbased on how the diffserv class/PHB actually separates flows. The goal is to have the CIR>0 TCP flow self-guarantee its CIR even when there is congestion. This is of course only necessary when the PHB does not separate out flows into separate queues, if it does, then the queue should take care of that. > And the same TCP congestion control will also work very well if for some reason CIR cannot be guaranteed in the network. That can e.g. occur even in a network that can guarantee CIR and PIR, e.g., if there is network misconfiguration. In that case, the app will need to throttle down their sending rate, but as the network does not deliver CIR, there is no alternative to reduce the rate anyway. As said above, its about te modification that work towards distinguishing randomn loss from congestion loss and the ability to support leightweight DSCP/PHB implementations, where there will be no network based defense of CIR for flows who have them. > > When sending with less than CIR, it should be subject to a (binary) parameter > > whether or not to use ECN as an explicit congestion OAM indication resulting > > in a faster circuit breaker/revert to CIR=0, or whether to ignore it completely > > (and use the above loss/other TCP parameter based circuit breaker). > > That seems to be a different algorithm than what is currently in the draft. Not different, just explained how the not-yet-included-in-00 ECN behavior would be. > The starting point for a discussion about congestion control is a complete specification ;-) I can mostly remember early drafts in in rmcat, so i am not sure about accurate metrics for "complete", but we definitely have good improvements to do for -01. > and measurement results. Did you take a look at the 10 year old draft-lochin-ietf-tsvwg-gtfrc-02 i pointed you to ? Would a presention of analysis as done in that document meet your bar for measurement results (obviously, one would need to repeat this type of analysis for the proposed TCP mechanism instead of TFRC) ? > This could possibly also be done at research conferences. Given how e.g.: Emmanuels draft did the same 10 years ago for TFRC, and this work tries to apply the same scheme to TCP proper, i wonder how interesting this is to research. To me this is a long overdue, well understood, pragmatic, quite constrained extension to TCP (obviously in support of a larger framework of improving QoS/admission control systems). > > Parameter really depends on how DSCP is set up: > > > > When you end up in a single queue / same drop priority with flows sending > > more than CIR, then you will see congestion even though you're sending > > below your admission approved CIR, so you need to ignore ECN. This is not > > an ideal case, but would happen if you only use external, > > eg: SDN/PCEP admission control schemes without e.g.: > > our in-band signaling (mileage with RSVP would vary based on how it controls > > the forwarding plane). > > I cannot follow why it would be appropriate to ignore ECN as in that case a router is clearly congested. As said, this is primarily an issue when having to defend CIR against competing flows in same queue, so not an issue in the more desirable deployment options such as with inband signaling, so i am happy to ultimtely derive at conclusions where we may not want to call that option a standards option, it would just reduce the possible deployment options. I am actually not sure if you would have to ignore ECN to defend CIR in the same queue when the other competing flows are well behaved and also support ECN. It seems obvious to me that you will always loose out when you do support ECN but competing flows now. As long as you are in the (CIR...PIR) range, thats basically the price you pay for playing nice against a bully. Its just when you reach down to CIR you shouldn't want to be nice anymore in the same way - you've been competing with a bully all the way down from CIR..PIR and loosing to a bully, now you want to be affirmative ;-) > As far as I recall as "TCP wizard", the acronyms "SDN" and "PCEP" have not been mentioned in TCPM so far, albeit PCEP is a TCP-based protocol. As this have not come up in TCPM so far, I would assume that the use of "SDN" and "PCEP" technology could also work with the existing TCP standards. What do I miss? I am probably loosing these terms to naively too, the correct terminology i think that has ben used in DiffServ QoS docs is bandwidth broker to indicate offpath bandwidth management. I am using SDN somewhat cynical for everything offpath. And on second thought, let me withdraw the terms PCEC (PCEP was typo) and only bring it back when i am more cerrtain about its applicability as one option. > > > I would definitely default ECN=on to ensure some integration with external > > bandwidth management explicitly turns it off when its known to break the > > scheme. > > > > To re-summarize: > > > > - Only use on bandwidth management compatible traffic classes > > No, as far as I understand, draft-han-tsvwg-cc requires bandwidth management per TCP connection "per-flow bandwidth management compatible traffic classes" > > - Constrain to controlled network otherwise > > No to "otherwise" But tht was the point i was making about the standards RFC for traffic classes such as AF. We can go back, but as far as i remember none of these have been defined to be constrained to controlled networks. They ar all applicable to Intenet. They just have almost nowhere ben deployed there.But its definitely an architecturally saner approach to constrain applicability to well behaved and defined DSCP/PHB behavior than the somewhat vague "controlled network" term. > > - no redefinition of intended use of traffic classes > > (i think, need to revisit some AF details) > > No, out of my head per-TCP connection admission control would require changes in AF (but I don't recall for sure) I've been using AF with RSVP forever, admittedly only with RTP, but i don't think that the protocol should matter. Just the behavior of the protocol. And not being able to use TCP easily in those classes is one of the drivers. > > - circuit breaker making it safe against > > use across ERRONEOUS use across non-controlled/Internete/BE. > > No, circuit breaker is not needed in TCP as long as applications are elastic. For totally unelastic traffic, the question would first be why to use TCP first of all and I don't see this answered in the drafts. I did give examples... More and more even video apps rely on TCP (for better or worse). > > - ECN > CIR, ECN as parameter < CIR > > No, at first sight that does not make sense but I would need to see a full spec, measurement, etc. > > Thanks > > Michael Thanks Toerless > > > > Of course, lots of still unanswered points from your side, but hope this is a > > good start. > > > > Cheers > > toerless > > > > P.S: You said no hat on, but i still see the pointy TCP wizard hat. > > > > Authors, all, > > > > I have read draft-han-tsvwg-cc-00. Below I have listed a number of > > questions, which I believe would have to be addressed when discussing such > > a mechanism in the IETF or IRTF. > > > > This e-mail is strictly limited to the content of draft-han-tsvwg-cc-00. As the > > draft does not specify how the CIR and PIR will actually be guaranteed in the > > Internet, as well as how OAM signaling will work at Internet scale, I will not > > comment here on these assumptions, except regarding requirements that > > strictly follow from the content of the I-D. The technical, economical, and > > regulation aspects of the assumptions are not in scope of TCPM and they > > need to be discussed and solved elsewhere. > > > > Questions on draft-han-tsvwg-cc-00: > > > > 1/ The document seems to implicitly assume that network resources are > > reserved for *every* single TCP connection, right? > > > > > > * If that assumption is correct, it has to be spelt out explicitly in the text > > and it has to be noted that the underlying technology has to provide these > > capabilities *for every single* TCP connection. > > * Otherwise sentences like "after a TCP session is successfully initiated its > > congestion window (cwnd) jumps to CIR" would not make sense as multiple > > TCP connections within an traffic aggregate policied by CIR/PIR could start to > > all send with CIR in parallel, which would trigger massive congestion. > > * As an example, in my reading draft-han-6man-in-band-signaling-for- > > transport-qos-00 would allow also reservations e.g. for aggregates of > > multiple TCP connections. Such an operation mode seems not be compatible > > with the suggested mechanism in this I-D, as far as I understand. So the > > requirements have to be made explicit. > > * Also, sentences such as "it is assumed that in bandwidth guaranteed > > networks there have been network resources (bandwidths, queues etc.) > > dedicated to the TCP flows" have to be corrected to specify that for the > > mechanism in this draft to work correctly, the resources have to be > > guaranteed to every single TCP connection, not multiple "flows". > > > > 2/ Why does the document not rely on ECN (and not even reference ECN)? > > > > > > * For instance, the following requirement "It is important that OAM needs > > to be able to detect if any device's buffer depth has exceeded the pre- > > configured threshold, as this is an indication of potential congestion and > > packet drop" could possibly be solved by ECN, no? > > * Even in case another OAM mechanism could be used in addition, a > > comprehensive TCP congestion control specification would have to also cover > > the reaction to ECN marks as well, as well as the potential combination of > > feedback results. Why is this missing? > > * Or would the document mandates that ECN MUST NOT be enabled for > > TCP connections using this congestion control mechanism? > > > > 3/ Why does the document assume that congestion windows are calculated > > in segments and not in bytes? > > > > > > * RFC 5681 as well as many other RFCs calculate CWND in bytes. > > * However, I believe equations such "MinBandwidthWND = CIR * > > RTT/MSS" or "MaxBandwidthWND = PIR * RTT/MSS" would return a window > > counted in MSS segments. > > * Apart from the mismatch with the TCP standards, this sort of equation > > might also requires a discussion on how to deal with integer division. > > > > 4/ How does the mechanism deal with IP and TCP header overhead? > > > > > > * TCP window sizes are about the TCP bytestream, while the actual IP > > packets sent by a TCP/IP stack will include an IP and TCP header. If one > > neglects the IP and TCP headers in the congestion window calculation, the > > resulting IP packet rate will be larger than the CIR and PIR seen in the TCP > > layer. This could result in packet drops if CIR and PIR are enforced e.g. for IP > > packet length. > > * How will this problem be solved? Note that TCP (and also IP) can include > > header options, which results in variable header sizes. The number of TCP > > options can be different for each TCP segment. How does this congestion > > control mechanism correctly handle the headers and the options in IP and > > TCP headers? > > > > 3/ How does the document deal with RTT variations? Is the assumption that > > the RTT is constant? > > > > > > * As far as I can tell from experiments, the RTT estimation is important > > when applying a rate to window-based congestion control, which is what this > > document does. > > * Equations such "MinBandwidthWND = CIR * RTT/MSS" or > > "MaxBandwidthWND = PIR * RTT/MSS" only provide a window equivalent to > > the bandwidth-delay product of the path if the RTT sample is a correct > > prediction of the actual delay that the segments in flight will experience. How > > does the mechanism suggested in this document correctly predict the future > > RTT of the segments that are sent by the sender at a given point in time? > > * As an example, assume that the RTT at time t=10s is determined as 80ms. > > Assume PIR = 10 Mbps and neglect the questions 3/ and 4/. Then this > > document would probably assume that MaxBandwidthWND=100 kB is the > > bandwidth delay product of the path during t=10s and t=10.08s, i.e., the > > maximum amount of outstanding data that can be sent in that time without > > drops (or exceeding PIR). But assume that the actual round-trip delay of > > segments has dropped to 40ms after the last RTT management, which means > > that the maximum bandwidth delay product of the path at t=10s+epsilon is > > only 50 kB. As a result, 50 Kb out of the congestion window would likely be > > dropped during t=10s and t=10.08s. And, due to the wrong RTT value, the > > effective data rate of the sender could even be 20 Mbps, if the RTT mismatch > > is not detected immediately, or, e.g., if EWMA will delay the update of the > > weighted RTT parameter to the actual value. > > * So how does the proposed scheme to indeed determine a window that > > meets the statement "This means a TCP sender is never allowed to send data > > at a rate larger than PIR" if the RTT is not constant? Does this assume rate > > pacing in the TCP sender for each TCP connection? > > > > 4/ How is it ensured that OAM alarms will reach the TCP sender in time in all > > possible "random failure" cases? > > > > > > * As far as I understand, the following statement "When a sender receives > > the third duplicated ACK, but no previous OAM congestion alarm has been > > received, then it is considered that a segment is lost due to random failure > > not congestion. In this case the cwnd is not changed." mandates that an > > OAM alarm is received prior to the third duplicate ACK *in all potential cases* > > of congestion. If the OAM alarm got lost or delayed, this condition would > > imply that cwnd is not changed despite a segment has been dropped due to > > congestion, which would be a violation of fundamental Internet congestion > > control principles. > > * Please expand on how this document ensures that cwnd will be reduces > > in all potential cases when a packet gets dropped due to congestion, and > > what requirements on the OAM alarms propagation follow from that. Of > > specific interest are effects such as packet drops of packets relevant for the > > OAM information, reordering of packets, asymmetric routing in forward and > > reverse direction, use of multiple paths in parallel (ECMP), and the like. If the > > document makes assumption about the path such as in-order packet delivery > > or the like, these assumptions need to be spelt out explicitly. > > * I understand that the OAM could be solved in different ways and the > > solution is independent of this document. But this document has to > > comprehensively specify all technical requirements that the OAM > > mechanism has to meet in order to ensure that every single packet drop due > > to congestion always results in a cwnd reduction. Otherwise the algorithm > > has to change as it does not safely prevent congestion. > > > > 5/ What is the expected performance benefit? Are there situations in which > > performance will be worse than standard TCP congestion control? > > > > > > * The document does not contain any data of potential improvements or > > deteriorations as compared to the TCP standard congestion control. I assume > > that such data will be presented to explain why this mechanism is proposed, > > and what benefits it has. > > * As I have experimented with similar mechanisms quite a bit, I believe > > there will be cases in which this congestion control mechanism will perform > > worse than a TCP sender fully compliant to RFC 5681, when using the same > > network path with CIR and PIR guarantees. I believe this document should > > analyze these cases and reason why a worse performance than standard TCP > > congestion control will be acceptable. IMHO this issue will specifically apply in > > cases when PIR is significantly larger than CIR, and if the RTT is large. As far as > > I can see, this draft mandates to start the data transfer in congestion > > avoidance at CIR rate, which means that it can take many RTTs until the > > sender reaches the PIR. In contrast, RFC 5681 will run slow-start, and RFC > > 5681 states that the "initial value of ssthresh SHOULD be set arbitrarily high". > > This means that the TCP sender can reach PIR within few RTTs and thus can > > send with full PIR speed, while a sender using draft-han-tsvwg-cc-00 will > > send with a much lower speed CIR+epsilon. For short and medium-sized data > > transfers, IMHO it can happen that the congestion control according to RFC > > 5681 will significantly outperform the mechanism suggested in this > > document, i.e., it will complete data transfers orders of magnitude faster > > even without any knowledge about CIR and PIR. Have the authors compared > > this mechanism to the performance of RFC 5681? > > * Also, have the authors compared the performance of this mechanism as > > compared to a modern TCP stack, which often use RFC 6928 (IW 10) and RFC > > 8312 (CUBIC)? In what cases has the suggested congestion control a better > > performance? I ask this because I have performed experiments 10 years ago > > with congestion control schemes that have some similarity to what is > > suggested here, and they also used knowledge about the path properties. In > > those experiments, it turned out to be quite difficult to design an algorithm > > that uses knowledge about the path (such as CIR/PIR) and that outperforms > > CUBIC in combination IW 10, even if such a stack is totally unaware of the > > path. This has been discussed e.g. in ICCRG > > https://www.ietf.org/proceedings/73/slides/iccrg-2.pdf. As context, "more- > > start" in this document is somewhat similar to what is proposed in this I-D > > (but applied to CUBIC), while the "initial-start" graphs somehow corresponds > > to what was later specified in RFC 6928 (IW 10) and RFC 8312 (CUBIC). > > > > 6/ For what application traffic patterns is this mechanism proposed? > > > > > > * The document states in Section 3 "... with the development of new > > applications, such as AR/VR". What properties do such applications have to > > leverage the mechanism suggested in this document? Is it possible to > > characterize what the "new" requirements are, and how the suggested > > algorithm meets these requirements? > > * Is it suggested to apply this congestion control to real-time media traffic > > over TCP? If so, what would be the benefit of using TCP in general and of the > > specific mechanism compared to congestion control algorithm for such traffic > > (e.g., the RMCAT working group)? > > > > This list of questions is not comprehensive, but I'll stop here. > > > > Regarding potential next steps of this document in the TCPM working group, > > I believe that the applicable TCPM charter wording is: "In addition, TCPM may > > document alternative TCP congestion control algorithms that are known to > > be widely deployed, and that are considered safe for large-scale deployment > > in the Internet." Until these prerequisites are fulfilled in the Internet, in my > > view the document cannot be adopted in TCPM. Research could be > > performed in the IRTF, e.g., in ICCRG. > > > > Thanks > > > > Michael (with no hat on) -- --- tte@cs.fau.de From nobody Fri Mar 16 09:45:13 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9BAB012D88F; Fri, 16 Mar 2018 09:44:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.961 X-Spam-Level: X-Spam-Status: No, score=-3.961 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pWVi_q9eFomC; Fri, 16 Mar 2018 09:44:55 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7DB5E12D969; Fri, 16 Mar 2018 09:44:55 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id B394C58C4E5; Fri, 16 Mar 2018 17:44:50 +0100 (CET) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 9A0F9B0DD48; Fri, 16 Mar 2018 17:44:50 +0100 (CET) Date: Fri, 16 Mar 2018 17:44:50 +0100 From: Toerless Eckert To: "Scharf, Michael (Nokia - DE/Stuttgart)" Cc: Lin Han , Gorry Fairhurst , Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" , Katsushi Kobayashi , Yingzhen Qu Message-ID: <20180316164450.GA31123@faui40p.informatik.uni-erlangen.de> References: <050065D2-5F2E-4E79-9BD1-E1DC03F13900@acm.org> <5AA79C2E.1040808@erg.abdn.ac.uk> <20180313164928.GA17042@faui40p.informatik.uni-erlangen.de> <1D30AF33624CDD4A99E8C395069A2A162CDBBA47@sjceml521-mbs.china.huawei.com> <1D30AF33624CDD4A99E8C395069A2A162CDBBA8E@sjceml521-mbs.china.huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 16:45:06 -0000 Michael: IMHO, the goal is to establish the model of mixed inelastic and elastic CIR..PIR traffic elasticity as an option for TCP. The problem is to define it in such a way that it is implementable, and as you say there there are now many different CC schemes for TCP. We choose Reno as a well known reference in the hope that others could then pick up and adopt to more modern, more complex CC algorithms, whereas the newer ones have likely a lot more intricacies and fewer folks who would know how to adopt the goals in details to those algorithms (i may be wrong on this one). Maybe using a rather older refeence CC scheme like reno to define an easily implementable version of the CIR..PIR goal is not the right approach, but the description shuold be more abstract ? Or just use as Emmanual did rely on TFRC as a reference ? Given how i think ( i may be wrong) that TFRC is not really applied to TCP, i thought another approch would have to be used. Advice very much welcome. The principles intended to be established are not really rocket science: - Constrain yourself to a max of PIR - Operate under expectation to have CIR guaranteed (expectation to be provided from other components) - fast-start to CIR, reduce only to CIR on bad congestion feedback. - When operating at/below CIR: - distinguish congestion from random loss - repair random loss. Keep rate at CIR. - break or revert to CIR=0 on congestion loss - optional (shared queue DSCP/PHB option) defend CIR against congestion from up to a point where its likely to be an CIR admission failure and not bullying contenders - Operate unchanged in all other cases (eg: between CIR..PIR). Cheers Toerless On Fri, Mar 16, 2018 at 08:24:44AM +0000, Scharf, Michael (Nokia - DE/Stuttgart) wrote: > Hi Lin, > > Thanks a lot. I read from your explanation that a leased line would solve the performance problem. Leased lines are offered by service providers already. Have you compared the performance of your proposed TCP modification over an existing leased line service of a service provider? And have you compared the result with a modern TCP stack with CUBIC, IW10, and the like running over the same service, without having to guess a PIR/CIR? For which cases would your scheme provide a better service to the application compared to what TCP can do today? > > I suggest to study real measurements to understand how much headroom for improvement indeed exists, as compared to what TCP congestion control already can do today without any new technology. > > For instance, a single TCP connection scales up to multiple 10 Gbps, i.e., as far as I know it basically can reach the limit what a single computer can process with current processors. TCP works very well over short latencies since more than 20 years. > > Thanks > > Michael > > > From: tsvwg [mailto:tsvwg-bounces@ietf.org] On Behalf Of Lin Han > Sent: Friday, March 16, 2018 3:02 AM > To: Scharf, Michael (Nokia - DE/Stuttgart) ; Toerless Eckert ; Gorry Fairhurst > Cc: Thomas Nadeau ; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi ; Yingzhen Qu > Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) > > Hi, Michael > > As described in the original draft draft-han-6man-in-band-signaling-for-transport-qos, the new method is not designed for the normal application that current TCP works well.. It does not try to replace or compete with TCP for most of current applications. It is designed for the scenario that the regular TCP cannot satisfy the requirement in terms of bandwidth or latency. I..e, ultra-high bandwidth or ultra-short latency. > > For example, there is no networked AR/VR (with good quality) now since no network or transport technology can satisfy its unusual requirement (see detailed analysis in draft-han-iccrg-arvr-transport-problem-00). In order to provide such service, SP may need to dramatically increase network, link capacity and even topology. Currently, a user may be only able to get such service by a leased line, but it is too expensive for most of people. > > When an application selects the PIR and CIR, it must know the consequence for the value. As you said, if PIR>>CIR, it means it's a very burst traffic, and using new method may not make sense since user should know for the rate above CIR, the behavior will be almost same as regular reno, and above PIR is worse than reno since it will be dropped. > How to smartly select PIR/CIR is another topic and irrelevant to the CC algorithm. > > Regards > > Lin > > From: Scharf, Michael (Nokia - DE/Stuttgart) [mailto:michael.scharf@nokia.com] > Sent: Thursday, March 15, 2018 6:07 PM > To: Lin Han >; Toerless Eckert >; Gorry Fairhurst > > Cc: Thomas Nadeau >; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi >; Yingzhen Qu > > Subject: RE: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) > > As I wrote already, I believe there will be scenarios where the TCP Reno congestion control will complete data transfers significantly faster than what you propose, i.e., your proposal results in worse performance. > > I suggest to draw a picture with PIR>>CIR and a larger RTT. Then you will see that there will be cases in which TCP Reno outperforms what you suggest. Which raises the question why an application should setup a TCP session that will be slower than the default. > > Michael > > > > From: Lin Han [mailto:Lin.Han@huawei.com] > Sent: Friday, March 16, 2018 2:00 AM > To: Scharf, Michael (Nokia - DE/Stuttgart) >; Toerless Eckert >; Gorry Fairhurst > > Cc: Thomas Nadeau >; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi >; Yingzhen Qu > > Subject: RE: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) > > > Hi, Scarf > > > > For draft-han-tsvwg-cc, we have some assumptions > > 1. User application setup TCP session with a given PIR/CIR, > > 2. Network devices on the path will satisfy such expectation. In details, the traffic with the rate below CIR is always guaranteed to pass, and above PIR will be dropped; If the rate is between PIR and CIR, the traffic may be competing with others to get the resource. > > This draft try to propose what we should change for the current CC for above scenarios, the picture below may explain more clearly for what is the difference of new algorithm with reno: > > [cid:image001.png@01D3BC8D.57335970] > > > > > > -----Original Message----- > From: tsvwg [mailto:tsvwg-bounces@ietf.org] On Behalf Of Scharf, Michael (Nokia - DE/Stuttgart) > Sent: Thursday, March 15, 2018 5:34 PM > To: Toerless Eckert >; Gorry Fairhurst > > Cc: Thomas Nadeau >; tcpm@ietf.org; tsvwg@ietf.org; tsvwg-chairs@ietf.org; Katsushi Kobayashi >; Yingzhen Qu > > Subject: Re: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) > > > > > TCP quickstart really relates IMHO primarily to > > > draft-han-6man-in-band- signaling-for-transport-qos, but not to > > > draft-han-tsvwg-cc. The latter one is > > > > This is wrong. Section 4.4 in RFC 4782 is very related to draft-han-tsvwg-cc. Of specific interest is e.g. the handling of ssthresh. RFC 4782 also considers packet headers. > > > > > really meant to modify TCP assuming a known guaranteed CIR - whatever > > > mechanism is used to provide that guarantee. > > > > > > TCP quickstart is an interesting example for inband signaling, which > > > is what Lin's in-band-signaling draft does too. The main difference is > > > that our draft focusses on high-value traffic where per-flow state is > > > feasible and beneficial, if not necessary. And TCP quickstart seems more targeted to ANY TCP flow. > > > > No. Quick-Start only has benefits if it is enabled by the applications that can indeed leverage it, which is a subset of all TCP flows. If a host naively applies it to any TCP connection, there will be no benefit as most Quick-Start requests will be rejected. So the endpoint has a strong incentive to enable it only on these connections that actually leverage it. Actually doing this is a problem of its own. I have discussed this issue with AR/VR developers 10 years ago and it was non-trivial by then. It would be interesting to learn what has changed since then in the application developer community. > > > > > Which raises a complete different scalability challenge to TCP quickstart... > > > > Yep. Quick-Start can be implemented in a router without per-flow state and thus scales e.g. on network processors. 10 years ago we found that the key performance bottleneck in the fast path would be the state-synchronization between the different cores of a network processor. But as Quick-Start does not perform hard guarantees, this can be worked around. > > > > I am not a hardware expert, any maybe state synchronization between many cores is cheaper these days. But I'd really like to understand how hard QoS guarantees for single TCP connections would be achieved e.g. on modern multi-core network processor (i.e., multiple TBit/s). > > > > > This type of comparison discussion will go into draft updates on our side... > > > > > > Would be interested in any more data points about the history of TCP > > > quickstart, eg: where it was observed in the wild in deployments. > > > > In my experiments 10 years ago, there was little performance benefit of Quick-Start as compared to IW10, which was published in RFC 6928. My experiments are published in http://www.ikr.uni-stuttgart.de/Content/Publications/Archive/Sf_Diss_40112.pdf. > > > > I strongly suggest to compare new congestion control schemes tot CUBIC+IW10 as baseline, and to show how much performance benefit one indeed gets, and at what risk and costs. > > > > Michael > > > > -- --- tte@cs.fau.de From nobody Fri Mar 16 10:54:37 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 49AE812D7E8; Fri, 16 Mar 2018 10:54:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.699 X-Spam-Level: X-Spam-Status: No, score=-2.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qriQBmsjZ6x0; Fri, 16 Mar 2018 10:54:32 -0700 (PDT) Received: from mail-yw0-x235.google.com (mail-yw0-x235.google.com [IPv6:2607:f8b0:4002:c05::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 803CB12D7E6; Fri, 16 Mar 2018 10:54:32 -0700 (PDT) Received: by mail-yw0-x235.google.com with SMTP id r66so7506608ywh.10; Fri, 16 Mar 2018 10:54:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=mtk+s49+zVOxt4RXknwdwqFcJnosMysXjaUC2ijkK9c=; b=iB4WtLkgZADQoYrpgy/X02FMPEMsmnt5q0iHxJKy1b6exeX+p5p/E4xTI2d4UFQbHm yeq8YvlS/4tXOT+rJqkDeXNuV8xKbSbYXYsq8cVdr/g28Q4TE67S3AOUwly+FhluvoPa Jsff7ATWt9PH5FnIoIGiHbRorolMxuyZ438A7Vdpe5BId/4sFIlnQsSbPjF046956T2d o+iI2wPI5G08oeBsapPYl/M3uzKwjXb49AXwe7wZIRRo1/mG5g85x5XpSxay3hYGxJRp 8EoVGv0/mb2GdBQNRVlelw8LY68awZzUI0Jb9AIU0HjeWor41uTj8Vn6/3pDcPjdjEkO mKeQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=mtk+s49+zVOxt4RXknwdwqFcJnosMysXjaUC2ijkK9c=; b=ExCQ8unA3npz3e2PgIuSUbnIGKCHQA61cco4RIb2Fo/q5gGuME/vMiK1KnmLIHPq2q DD6YYZs6wtzOSpf72NquJXzu9lpXxZR/Jh/21f7BekCCauFoZiO5hPrMpJOVNaXeyPqs LwmY4ejUuv49LZpwfXEXY20dWHIVO2ANVpcEqKqcSsgSLYp3QxKHmAq19KBYP5A2BUSq H4At0+ufIKQd9bevaUk/60H5BFUI6nr1S7Puiz1R6QZ+TGk6fHkosVNcjLMWL+X48VG9 Hwc+WUvXtR7TmW9QPAeaY43L3WWhV+8GTDZ/X1vKhE5dywDgFu1WYWDQXnTN3UscDTfC BMBA== X-Gm-Message-State: AElRT7GIUHPXANGRV8xKqvsJZL+DlqRp8n69TYTCv0aqxDYWtlnNXmAX q7lWwlxWpndhzz+KrdcK9RkhqqZHE+bcXB7wOeM= X-Google-Smtp-Source: AG47ELtVHIuyDfjnepSvHkOpdjTRJ90SZJcKsZjrPygHga/hYvce/1ZpKcemU1z/maDHXHeeHMSZKPEjh4gI+Uq/XBA= X-Received: by 10.13.192.132 with SMTP id b126mr1729152ywd.52.1521222871260; Fri, 16 Mar 2018 10:54:31 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a25:5f0f:0:0:0:0:0 with HTTP; Fri, 16 Mar 2018 10:54:30 -0700 (PDT) In-Reply-To: <20180316164450.GA31123@faui40p.informatik.uni-erlangen.de> References: <050065D2-5F2E-4E79-9BD1-E1DC03F13900@acm.org> <5AA79C2E.1040808@erg.abdn.ac.uk> <20180313164928.GA17042@faui40p.informatik.uni-erlangen.de> <1D30AF33624CDD4A99E8C395069A2A162CDBBA47@sjceml521-mbs.china.huawei.com> <1D30AF33624CDD4A99E8C395069A2A162CDBBA8E@sjceml521-mbs.china.huawei.com> <20180316164450.GA31123@faui40p.informatik.uni-erlangen.de> From: Spencer Dawkins at IETF Date: Fri, 16 Mar 2018 17:54:30 +0000 Message-ID: To: Toerless Eckert Cc: "Scharf, Michael (Nokia - DE/Stuttgart)" , Gorry Fairhurst , Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" , Katsushi Kobayashi , Yingzhen Qu Content-Type: multipart/alternative; boundary="001a114e6454dda54905678b4c93" Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 17:54:35 -0000 --001a114e6454dda54905678b4c93 Content-Type: text/plain; charset="UTF-8" I'm watching this thread, in all its variations across mailing lists, with great interest, but not participating, except to say ... On Fri, Mar 16, 2018 at 4:44 PM, Toerless Eckert wrote: > Michael: > deleted down to > Maybe using a rather older refeence CC scheme like reno to define an easily > implementable version of the CIR..PIR goal is not the right approach, > but the description shuold be more abstract ? Or just use as Emmanual did > rely on TFRC as a reference ? Given how i think ( i may be wrong) that > TFRC is > not really applied to TCP, i thought another approch would have to be used. I wouldn't use TFRC as a reference unless you can find people who are actively using it as if it was a good thing. I was still on the IAB when RMCAT was chartered, but I was also on the IAB program committee for https://www.iab.org/activities/workshops/cc-workshop/, which was the immediate predecessor activity for RMCAT, and IIRC, we couldn't find anyone who actually used TFRC for serious work. It was apparently being used as a fig leaf because prior to TFRC we had no advice for non-TCP rate control at all. So, at least people could say "do something, and TFRC is something", in their drafts without being flushed out of the IESG. IMO, of course. Spencer, speaking NOT as an AD, in this case ... --001a114e6454dda54905678b4c93 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I'm watching this thread, in all its variations across= mailing lists, with great interest, but not participating, except to say .= ..

On Fri, Mar 16,= 2018 at 4:44 PM, Toerless Eckert <tte@cs.fau.de> wrote:
Michael:

deleted down to=C2=A0
=C2=A0
Maybe using a rather older refeence CC s= cheme like reno to define an easily
implementable version of the CIR..PIR goal is not the right approach,
but the description shuold be more abstract ? Or just use as Emmanual did rely on TFRC as a reference ? Given how i think ( i may be wrong) that TFRC= is
not really applied to TCP, i thought another approch would have to be used.=

I wouldn't use TFRC as a reference unl= ess you can find people who are actively using it as if it was a good thing= .=C2=A0

I was still on the IAB when RMCAT was char= tered, but I was also on the IAB program committee for=C2=A0https://www.iab.org/acti= vities/workshops/cc-workshop/, which was the immediate predecessor acti= vity for RMCAT, and IIRC, we couldn't find anyone who actually used TFR= C for serious work. It was apparently being used as a fig leaf because prio= r to TFRC we had no advice for non-TCP rate control at all. So, at least pe= ople could say "do something, and TFRC is something", in their dr= afts without being flushed out of the IESG.

IMO, o= f course.

Spencer, speaking NOT as an AD, in this = case ...
--001a114e6454dda54905678b4c93-- From nobody Fri Mar 16 12:20:22 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 75E9812D7ED; Fri, 16 Mar 2018 12:20:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.961 X-Spam-Level: X-Spam-Status: No, score=-3.961 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nh43EtgtjJzF; Fri, 16 Mar 2018 12:20:18 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 22706127871; Fri, 16 Mar 2018 12:20:17 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 956D058C4C6; Fri, 16 Mar 2018 20:20:13 +0100 (CET) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 786E0B0DD4B; Fri, 16 Mar 2018 20:20:13 +0100 (CET) Date: Fri, 16 Mar 2018 20:20:13 +0100 From: Toerless Eckert To: Spencer Dawkins at IETF Cc: "Scharf, Michael (Nokia - DE/Stuttgart)" , Gorry Fairhurst , Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" , Katsushi Kobayashi , Yingzhen Qu Message-ID: <20180316192013.GB31123@faui40p.informatik.uni-erlangen.de> References: <050065D2-5F2E-4E79-9BD1-E1DC03F13900@acm.org> <5AA79C2E.1040808@erg.abdn.ac.uk> <20180313164928.GA17042@faui40p.informatik.uni-erlangen.de> <1D30AF33624CDD4A99E8C395069A2A162CDBBA47@sjceml521-mbs.china.huawei.com> <1D30AF33624CDD4A99E8C395069A2A162CDBBA8E@sjceml521-mbs.china.huawei.com> <20180316164450.GA31123@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 19:20:21 -0000 Thanks, Spencer! Is there any newer formalistic reference for "TCP friendly CC" or "Internet fair CC" that one could reference ? Or are we down to the battle ground of coming up with a random CC algorithm and showing through testing that it will be within +- 10x speed of some "internet CC mix - Reno, QBR? BBR, nada, ..." ? If so, is there any defined "Internet CC mix" to do testing with ? how else... ;-)) Cheers Toerless On Fri, Mar 16, 2018 at 05:54:30PM +0000, Spencer Dawkins at IETF wrote: > I'm watching this thread, in all its variations across mailing lists, with > great interest, but not participating, except to say ... > > On Fri, Mar 16, 2018 at 4:44 PM, Toerless Eckert wrote: > > > Michael: > > > > deleted down to > > > > Maybe using a rather older refeence CC scheme like reno to define an easily > > implementable version of the CIR..PIR goal is not the right approach, > > but the description shuold be more abstract ? Or just use as Emmanual did > > rely on TFRC as a reference ? Given how i think ( i may be wrong) that > > TFRC is > > not really applied to TCP, i thought another approch would have to be used. > > > I wouldn't use TFRC as a reference unless you can find people who are > actively using it as if it was a good thing. > > I was still on the IAB when RMCAT was chartered, but I was also on the IAB > program committee for https://www.iab.org/activities/workshops/cc-workshop/, > which was the immediate predecessor activity for RMCAT, and IIRC, we > couldn't find anyone who actually used TFRC for serious work. It was > apparently being used as a fig leaf because prior to TFRC we had no advice > for non-TCP rate control at all. So, at least people could say "do > something, and TFRC is something", in their drafts without being flushed > out of the IESG. > > IMO, of course. > > Spencer, speaking NOT as an AD, in this case ... -- --- tte@cs.fau.de From nobody Fri Mar 16 16:10:08 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B3369126C3D for ; Fri, 16 Mar 2018 16:10:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1UjCufKgztNk for ; Fri, 16 Mar 2018 16:10:04 -0700 (PDT) Received: from drew.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2B0AE126C2F for ; Fri, 16 Mar 2018 16:10:03 -0700 (PDT) Received: from [192.168.48.187] (unknown [31.221.80.98]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTPSA id 5CB29721E281C for ; Sat, 17 Mar 2018 00:09:59 +0100 (CET) From: Michael Tuexen Content-Type: multipart/signed; boundary="Apple-Mail=_98FC8C8E-D136-4F04-9755-9CFBE8B6F65A"; protocol="application/pkcs7-signature"; micalg=sha1 Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) Date: Fri, 16 Mar 2018 23:09:57 +0000 References: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> To: "tcpm@ietf.org" In-Reply-To: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> Message-Id: X-Mailer: Apple Mail (2.3445.5.20) Archived-At: Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Mar 2018 23:10:07 -0000 --Apple-Mail=_98FC8C8E-D136-4F04-9755-9CFBE8B6F65A Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii > On 28. Feb 2018, at 20:12, Michael Tuexen = wrote: >=20 > Dear all, >=20 > this e-mail starts the working group last call for = draft-ietf-tcpm-alternativebackoff-ecn-06. >=20 > This WGLC runs until Friday, March 16th 2018. Please send any = comments, including indications > to support this document, to the TCMP mailing list by then. >=20 > The ID is available at > https://tools.ietf.org/html/draft-ietf-tcpm-alternativebackoff-ecn-06 Dear all, the references need some updates: * I-D.ECN-exp should be RFC8311 * I-D.CoDel should be RFC8289 * I-D.CUBIC should be RRC 8312 Best regards Michael (as an individual) >=20 > Best regards > Michael_______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm --Apple-Mail=_98FC8C8E-D136-4F04-9755-9CFBE8B6F65A Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIQkDCCBNUw ggO9oAMCAQICCFBOxvU9EbRkMA0GCSqGSIb3DQEBCwUAMHExCzAJBgNVBAYTAkRFMRwwGgYDVQQK ExNEZXV0c2NoZSBUZWxla29tIEFHMR8wHQYDVQQLExZULVRlbGVTZWMgVHJ1c3QgQ2VudGVyMSMw 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02:52:18 +0200 (EET) From: Markku Kojo X-X-Sender: kojo@dx6-cs-02.pc.helsinki.fi To: Michael Tuexen cc: tcpm@ietf.org, tcpm-chairs@ietf.org In-Reply-To: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> Message-ID: References: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="=_script-29106-1521247939-0001-2" Archived-At: Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2018 00:52:32 -0000 This is a MIME-formatted message. If you see this text it means that your E-mail software does not support MIME-formatted messages. --=_script-29106-1521247939-0001-2 Content-Type: text/plain; format=flowed; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable Hi all, Maybe slightly late wg last call review of=20 draft-ietf-tcpm-alternativebackoff-ecn-06. The draft is mostly well written and clear, and it is also improved since=20 version -00 or -01 I last read it. I believe the intention of the draft is just to allow and propose=20 experimentation using a larger multiplicative decrease factor when=20 responding to ECN indication than when responding to packet loss. There is, however, a significant change that seem to have occured from=20 version -04 to -05 that does much more than this and is therefore crucial=20 to address properly. The text and reads now in -06 as follows: It updates the following text in section 6.1.2 of the ECN specification [RFC3168] : The indication of congestion should be treated just as a congestion loss in non-ECN-Capable TCP. That is, the TCP source halves the congestion window "cwnd" and reduces the slow start threshold "ssthresh". Replacing this with: Receipt of a packet with the ECN-Echo flag SHOULD trigger the TCP source to set the slow start threshold (ssthresh) to 0.8 times the FlightSize, with a lower bound of 2 * SMSS applied to the result. As in [RFC5681], the TCP sender also reduces the cwnd value to no more than the new ssthresh value. And is further clarified in Section 4.3: and in response to an indication of an ECN-signalled congestion: ssthresh =3D max (FlightSize * beta_{ecn}, 2 * SMSS) and cwnd =3D ssthresh In my reading this text above sets a lower bound of 2 MSS for cwnd which=20 is incorrect and dangerous modification and maybe not intended to modify=20 RFC 3168. The lower bound for cwnd is 1 MSS. The lower bound of 2 MSS for cwnd 1) is not specified in any (standards track) RFC, 2) is against the congestion control principles for avoiding congestion collapse as it effectively disables a full back off that is a crucial requirement for all congestion control algorithms, 3) is in conflict with the basic principle set in Sally's ECN papers and in RFC 3168 itself (the original text above from RFC 3168): "The indication of congestion should be treated just as a congestion loss in non-ECN-Capable TCP." When Flightsize (and cwnd) is 2 MSS in non-ECN-Capable TCP and loss signals congestion, cwnd effectively becomes 1 MSS. That is why RFC 3168 formulates the text: "the TCP source halves the congestion window "cwnd" ..." Note: the majority of the work and text in RFC 3168, including the text in RFC 2482, predates RFC 2581 that first introduced FlightSize. Prior to RFC 2581 all TCP CC text "halved cwnd" which literally meant cwnd=3Dcwnd/2. Instead of the above text in the draft, the draft should explicitly state=20 that when FlightSize/2 would result in ssthresh below its lower bound of = 2=20 MSS, a TCP sender must not stop decreasing cwnd. And, if more=20 ECN-signalled congestion indications arrive, the TCP sender must continue=20 reducing sending rate further (plus refer to RFC 3168 how to proceed=20 reducing the sending rate, if further ECE signals arrive). Furthermore, the draft should be very specific on how the TCP sender=20 should act when cwnd=3Dssthresh and ECE arrives. Currently the draft=20 specifies the way how the TCP sender reduces ssthresh (and cwnd) in=20 Congestion Avoidance. According to RFC 5681, when cwnd =3D ssthresh, TCP = is=20 not in Slow Start nor in Congestion Avoidance. Therefore, the draft=20 should be explicit on how cwnd is reduced, when cwnd=3Dssthresh. It is true that there is (at least) one (widely deployed) incorrect=20 implementation of RFC 3168 that incorrectly sets lower bound of 2 MSS=20 for cwnd when congestion is ECN-signaled. This, however, must not be used=20 as any kind of justification for chang=EDng IETF-specified congestion=20 control principles and requirements. Instead, this draft should carefully=20 instruct implementors and those who intend to experiment with the ECN=20 modification set in this draft to ensure the TCP stack used for=20 experiments correctly implements RFC 3168 in this respect. Otherwise,=20 such experimental results are mostly void. In addition, there is an incorrect statement in Sec 4.1: According to [RFC5681], when a TCP sender detects segment loss using the retransmission timer and the given segment has not yet been resent by way of the retransmission timer, the value of ssthresh must be set to no more of the maximum of half of the FlightSize and 2*SMSS. The same equation is also used during Fast Retransmit/Fast Recovery [RFC5681]. As a result, the TCP congestion control only allows one BDP of packets in flight. This is just sufficient to maintain 100% utilisation of the bottleneck on the network path. What the text says about setting ssthresh is correct. However, if the=20 segment loss is detected using the retransmission timer, the TCP congestion control does not allow one BDP of packets in flight (unless=20 BDP=3D1 MSS). Instead, cwnd is set to 1 MSS, allowing only 1 pkt in fligh= t. I suggest removing the text that discusses detecting segment loss using=20 the retransmission timer. Best regards, /Markku --=_script-29106-1521247939-0001-2-- From nobody Sat Mar 17 00:17:26 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8DF6A127076 for ; Sat, 17 Mar 2018 00:17:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.21 X-Spam-Level: X-Spam-Status: No, score=-4.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id K8VjeenlZgr1 for ; Sat, 17 Mar 2018 00:17:22 -0700 (PDT) Received: from mail-out02.uio.no (mail-out02.uio.no [IPv6:2001:700:100:8210::71]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 44D23124BFA for ; Sat, 17 Mar 2018 00:17:22 -0700 (PDT) Received: from mail-mx04.uio.no ([129.240.10.25]) by mail-out02.uio.no with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ex65d-000A93-Mm; Sat, 17 Mar 2018 08:17:17 +0100 Received: from 93-58-133-64.ip158.fastwebnet.it ([93.58.133.64] helo=[10.0.0.2]) by mail-mx04.uio.no with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) user michawe (Exim 4.90_1) (envelope-from ) id 1ex65b-0003af-SD; Sat, 17 Mar 2018 08:17:17 +0100 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) From: Michael Welzl In-Reply-To: Date: Sat, 17 Mar 2018 08:17:12 +0100 Cc: Michael Tuexen , tcpm@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> To: Markku Kojo X-Mailer: Apple Mail (2.3273) X-UiO-SPF-Received: Received-SPF: neutral (mail-mx04.uio.no: 93.58.133.64 is neither permitted nor denied by domain of ifi.uio.no) client-ip=93.58.133.64; envelope-from=michawe@ifi.uio.no; helo=[10.0.0.2]; X-UiO-Spam-info: not spam, SpamAssassin (score=-4.9, required=5.0, autolearn=disabled, AWL=0.075, TVD_RCVD_IP=0.001, UIO_MAIL_IS_INTERNAL=-5, uiobl=NO, uiouri=NO) X-UiO-Scanned: E94061EA2356C5D7569B60083E0E2EF7211C8579 Archived-At: Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2018 07:17:25 -0000 Dear Markku, Thank you very much for reading this! Answers in line below: > On Mar 17, 2018, at 1:52 AM, Markku Kojo wrote: >=20 > Hi all, >=20 > Maybe slightly late wg last call review of = draft-ietf-tcpm-alternativebackoff-ecn-06. >=20 > The draft is mostly well written and clear, and it is also improved = since version -00 or -01 I last read it. >=20 > I believe the intention of the draft is just to allow and propose = experimentation using a larger multiplicative decrease factor when = responding to ECN indication than when responding to packet loss. >=20 > There is, however, a significant change that seem to have occured from = version -04 to -05 that does much more than this and is therefore = crucial to address properly. The text and reads now in -06 as follows: >=20 >=20 > It updates the following text in section 6.1.2 of the ECN > specification [RFC3168] : >=20 > The indication of congestion should be treated just as a > congestion loss in non-ECN-Capable TCP. That is, the TCP source > halves the congestion window "cwnd" and reduces the slow start > threshold "ssthresh". >=20 > Replacing this with: >=20 > Receipt of a packet with the ECN-Echo flag SHOULD trigger the TCP > source to set the slow start threshold (ssthresh) to 0.8 times the > FlightSize, with a lower bound of 2 * SMSS applied to the result. > As in [RFC5681], the TCP sender also reduces the cwnd value to no > more than the new ssthresh value. >=20 >=20 >=20 > And is further clarified in Section 4.3: >=20 >=20 > and in response to an indication of an ECN-signalled congestion: >=20 > ssthresh =3D max (FlightSize * beta_{ecn}, 2 * SMSS) >=20 > and >=20 > cwnd =3D ssthresh >=20 >=20 >=20 > In my reading this text above sets a lower bound of 2 MSS for cwnd = which is incorrect and dangerous modification and maybe not intended to = modify RFC 3168. Just to be clear, indeed we absolutely did not intend to change the spec = here - however we thought we need to be clearer. Consider the original text: *** The indication of congestion should be treated just as a congestion loss in non-ECN-Capable TCP. That is, the TCP source halves the congestion window "cwnd" and reduces the slow start threshold "ssthresh=E2=80=9D.=20 *** Because this simply says =E2=80=9Creduces=E2=80=9D about ssthresh = without specifying in detail how to reduce it, it would seem obvious = (due to the first sentence) that this refers to eqn. 4 in RFC 5681. = However, if we say =E2=80=9C...set the slow start threshold (ssthresh) = to 0.8 times the FlightSize=E2=80=9D, then we lose the lower bound. This = is why we introduced it for ssthresh. As for cwnd, I find the original text to be contradictory in this = respect (unless I=E2=80=99m missing something). =E2=80=9CThe indication = of congestion should be treated just as a congestion loss in = non-ECN-Capable TCP. =E2=80=9C =3D> this, to me, means doing the same as = specified in RFC 5681 - but in RFC 5681, I couldn=E2=80=99t see any text = that allows cwnd to go below 2 MSS upon a =E2=80=9Ccongestion loss=E2=80=9D= (assuming this is not a timeout - where you=E2=80=99re right, our text = wrongly quoted RFC 5681 there, but that=E2=80=99s a separate issue = further below). ( Maybe you mean *during*, not after fast recovery? But that would be = confusing, as cwnd is also =E2=80=9Cinflated=E2=80=9D in this phase in = RFC 5681, which I hope we don=E2=80=99t do in response to ECE. ) However, RFC 3168, in the second sentence, beginning with =E2=80=9CThat = is, =E2=80=9C (indicating that this is just a clarification), states = that the TCP sources halves cwnd. > The lower bound for cwnd is 1 MSS. The lower bound of 2 MSS for cwnd >=20 > 1) is not specified in any (standards track) RFC, > 2) is against the congestion control principles for avoiding > congestion collapse as it effectively disables a full back > off that is a crucial requirement for all congestion control > algorithms, > 3) is in conflict with the basic principle set in Sally's ECN papers > and in RFC 3168 itself (the original text above from RFC 3168): >=20 > "The indication of congestion should be treated just as a > congestion loss in non-ECN-Capable TCP." >=20 > When Flightsize (and cwnd) is 2 MSS in non-ECN-Capable TCP and loss > signals congestion, cwnd effectively becomes 1 MSS. That is why RFC > 3168 formulates the text: "the TCP source halves the congestion > window "cwnd" =E2=80=A6" See above, regarding this text. We certainly don=E2=80=99t want to = change these principles but tried to be correct about what should = happen, and found the quoted text here to be contradictory. > Note: the majority of the work and text in RFC 3168, including > the text in RFC 2482, predates RFC 2581 that first introduced > FlightSize. Prior to RFC 2581 all TCP CC text "halved cwnd" > which literally meant cwnd=3Dcwnd/2. I know that, and I thought that this is the reason for the problem with = this text (due to updates of the non-ECN CC text). > Instead of the above text in the draft, the draft should explicitly = state that when FlightSize/2 would result in ssthresh below its lower = bound of 2 MSS, a TCP sender must not stop decreasing cwnd. And, if more = ECN-signalled congestion indications arrive, the TCP sender must = continue reducing sending rate further (plus refer to RFC 3168 how to = proceed reducing the sending rate, if further ECE signals arrive). Technically this makes sense to me, but I=E2=80=99m not currently = reading RFC 3168 this way. > Furthermore, the draft should be very specific on how the TCP sender = should act when cwnd=3Dssthresh and ECE arrives. Currently the draft = specifies the way how the TCP sender reduces ssthresh (and cwnd) in = Congestion Avoidance. According to RFC 5681, when cwnd =3D ssthresh, TCP = is not in Slow Start nor in Congestion Avoidance. Therefore, the draft = should be explicit on how cwnd is reduced, when cwnd=3Dssthresh. Why? RFC 5681 states =E2=80=9CWhen cwnd and ssthresh are equal, the = sender may use either slow start or congestion avoidance.=E2=80=9D - so = if you're an implementer, this basically tells you that you have to make = a decision on your own for the cwnd =3D=3D sthresh case. We specify how = to behave when you=E2=80=99re in congestion avoidance - thus it depends = on the decision you=E2=80=99ve taken for this case. > It is true that there is (at least) one (widely deployed) incorrect = implementation of RFC 3168 that incorrectly sets lower bound of 2 MSS = for cwnd when congestion is ECN-signaled. This, however, must not be = used as any kind of justification for chang=C3=ADng IETF-specified = congestion control principles and requirements. Instead, this draft = should carefully instruct implementors and those who intend to = experiment with the ECN modification set in this draft to ensure the TCP = stack used for experiments correctly implements RFC 3168 in this = respect. Otherwise, such experimental results are mostly void. Maybe the person behind this implementation was as confused by the RFC = 3168 as I am =E2=80=A6 clearly we didn=E2=80=99t intend to change the = principles. > In addition, there is an incorrect statement in Sec 4.1: >=20 > According to > [RFC5681], when a TCP sender detects segment loss using the > retransmission timer and the given segment has not yet been resent by > way of the retransmission timer, the value of ssthresh must be set to > no more of the maximum of half of the FlightSize and 2*SMSS. The > same equation is also used during Fast Retransmit/Fast Recovery > [RFC5681]. As a result, the TCP congestion control only allows one > BDP of packets in flight. This is just sufficient to maintain 100% > utilisation of the bottleneck on the network path. >=20 >=20 > What the text says about setting ssthresh is correct. However, if the = segment loss is detected using the retransmission timer, the TCP > congestion control does not allow one BDP of packets in flight (unless = BDP=3D1 MSS). Instead, cwnd is set to 1 MSS, allowing only 1 pkt in = flight. >=20 > I suggest removing the text that discusses detecting segment loss = using the retransmission timer. Good catch, thanks! 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charset=us-ascii Hi, I tried to write up a detailed reply, but I stopped myself. Here is the = meta-argument: Essentially, there seems to be an underlying desire here - for whatever = reason - to change the Internet to an architecture that has admission = control, and discuss how transport protocols should change in response = to that. I don't think such an change to the Internet will happen anytime soon. I = hence don't think that spending any time on discussing CC for such an = unlikely future is a very productive use of our time in the IETF. Lars --Apple-Mail=_39A72C11-241C-4B77-B4EE-72EBDE7F74B7 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEmpq0ZpSoejRmyhheVLXDCb9wwVcFAlqswZQACgkQVLXDCb9w wVcCLA//bUK59kgWMwA7Sfy/U2EBtx5Ms298eiN7NiugNaC5J2GT32l/Ox3951bB Mbmlkd9McLPKQxD07CmIRMAShWv3vMn3rKHrIwUIZuwgvGPo4J3L+tBg/xLkqY32 6DpruXNrjoFaXINGyVELh88tcpNC23peTqFH3oTAAZn/ac/G4v52/bRSHXXku0AH JTOvpRdgDwgdPqcQk/qco69TR+lVX5NGncadqau9K6AMf1lNs299kbhAfc1Hbc0q fNUuTtIjpP25n5mtA9Z8F86k+DDZDAo4a8Smg/YTPyoKCVzOCwk6C4Sb+IEHRdde aPP70SYauTDl+At25q3659gppVEMgb8DotbRDUiokRghFB7oVKGQj94jiOBPmDDA 9T85iBtpSfYLEboUws9wMhAk0nM3qE0VOuLWXLhT8i5gJYBtyuiEp00yGB62fHVL kGG6PgKBYg5TbDI32MndiqUUdm4bqc1Zu6Qhbr5S3LcyHdcTj0LgLwIg+H1k/C1B 6MBxg5WZP40le4JBE7T+UkGCWrZFb4EgkUaUrQ/L3X3M527cppfIxorl9Z0qsGAg rrSCy1ZTYsO9gDd5aS2QGWE+w7ANybkvt2kIRvbMChZ/V8yXyBLoFXJ2NvjPNTyi ZhLQxsgmh2wbSzvyFD0pnnhmr5h6cOiuzB1ZVDBCzKAH/Ip2Kl0= =5gwQ -----END PGP SIGNATURE----- --Apple-Mail=_39A72C11-241C-4B77-B4EE-72EBDE7F74B7-- From nobody Sat Mar 17 03:29:56 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7CA76127601 for ; 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DiffServ can only provide > differentiated service by PHB, but without the quantity control in terms = of > bandwidth or latency. This argument "if ECN is ignored" has been raised many times. ConEx was pro= posed as a remedy to issues where endpoints do not comply to the rules that= are set up, but it has not gained attraction so far. The counter argument = should be, what is really gained with congestion controls that misbehave in= one way or the other. In most of the work that I am active in you mainly s= poil your own performance with excessive end to end delay or packet loss if= the congestion control is badly configured. BR /Ingemar > -----Original Message----- > From: Lin Han [mailto:Lin.Han@huawei.com] > Sent: den 16 mars 2018 01:32 > To: Ingemar Johansson S ; > tte@cs.fau.de > Cc: tcpm@ietf.org; tsvwg@ietf.org; 'iccrg@irtf.org' > Subject: RE: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests fo= r > TSVWG@IETF101) >=20 > Hi, >=20 > See inline with [LH] >=20 > Thanks >=20 > Lin >=20 > -----Original Message----- > From: Ingemar Johansson S [mailto:ingemar.s.johansson@ericsson.com] > Sent: Thursday, March 15, 2018 1:24 AM > To: Lin Han ; tte@cs.fau.de > Cc: tcpm@ietf.org; tsvwg@ietf.org; 'iccrg@irtf.org' ; Ing= emar > Johansson S > Subject: RE: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests fo= r > TSVWG@IETF101) >=20 > Hi >=20 > Please see inline, marked [IJ] > /Ingemar >=20 > > -----Original Message----- > > From: Lin Han [mailto:Lin.Han@huawei.com] > > Sent: den 14 mars 2018 22:22 > > To: Ingemar Johansson S ; > > tte@cs.fau.de > > Cc: tcpm@ietf.org; tsvwg@ietf.org; 'iccrg@irtf.org' > > Subject: RE: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests > > for > > TSVWG@IETF101) > > > > Hi, Ingemar > > > > Tanks for the comments, See inline answer > > > > Best Regards > > > > Lin > > > > -----Original Message----- > > From: Ingemar Johansson S [mailto:ingemar.s.johansson@ericsson.com] > > Sent: Wednesday, March 14, 2018 12:56 AM > > To: Lin Han ; tte@cs.fau.de > > Cc: tcpm@ietf.org; tsvwg@ietf.org; 'iccrg@irtf.org' ; > > Ingemar Johansson S > > Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests > > for > > TSVWG@IETF101) > > > > Hi > > > > This subject pops up every once in a while. > > [LH] You are right -:) But this time, we bring up this issue for the > > future applications like AR/VR, not for applications that current TCP > > works well. See the detailed analysis in > > draft-han-iccrg-arvr-transport-problem-00. We believe for the > > applications, such as AR/VR/TSN, that are much sensitive to congestion > > or delay, current technologies are hard to satisfy the requirement. > [IJ] Please have a look at the RITE project experiments > https://riteproject.eu/, these show that you can achieve very short laten= cy > with L4S technology, L4S can in many ways coexist with diffserv and this = draft > outlines how the two can work together https://tools.ietf.org/pdf/draft- > briscoe-tsvwg-l4s-diffserv-00.pdf . Given this I am not convinced why an > inband QoS solution is needed for AR/VR. >=20 > [LH] Thanks for the reference, L4S can achieve the small latency for a cl= osed > network like DC where all hosts must behave same according to the > requirement to adjust the rate when the queue is exceeding the threshold. > If some host does not follow, i.e, ignore the ECN bit, I don't believe th= e > latency can be that good because all L4S flows share the same queue. > Another aspect is that even using ECN, we still cannot provide an expecte= d > and differentiated bandwidth to different user. DiffServ can only provide > differentiated service by PHB, but without the quantity control in terms = of > bandwidth or latency. >=20 > > > > I would like to add my perspective, given how I understand that 3GPP > > technology works. The 3GPP QoS framework can be used to offer for > > instance a Guaranteed bandwidth (GBR) to applications. The operation > > is that the "bearer" gets increased scheduling priority once the > > throughput is below the GBR value. > > In simulations I have verified that this framework can deliver a GBR > > to TCP flows when the network load increases, at least as long it is > > possible to push back other bearers with a lower priority. So, seen > > from my experience so far I am not fully confident that additional inba= nd > signaling is needed. > > [LH] Does it work well when the GW or eNodeB are congested? The > > purpose for in-band signaling is to guarantee network resource for a > > critical application no matter what happens. The congestion is the > > major problem for such requirement by current technology, because all > > flows can only share the bandwidth during congestion. > [IJ] As for eNB, the allocation of GBR/MBR comes with admission control. > However because of physical limitations in terms of limited power coverag= e > and/or radio interference, no in-band or out of band QoS signaling in the > world can guarantee a given throughput in all conditions. It is all matte= r of > prioritization of the available resource blocks, where each resources wor= th in > terms of bits is dictated by the laws of Shannon, somewhat on steroids wi= th > the use of adaptive antenna beamforming. >=20 > [LH] Yes, if the air interface has limit, no matter what signaling we use= will not > help. In-band signaling just provide a way to control the network device = on > the path to give a session expected resource. If the expected resource > cannot be given, the in-band signaling will notify the source host about = the > failure. The user can either reduce the resource demanded or use the > traditional TCP. If there is traffic engineering tool involved, the user = may use > different path that can satisfy the user's expectation for the TCP sessio= n > setup, this is not conflicting with the basic frame work of in-band signa= ling. > We can still use it with segment routing for such non-shortest path scena= rio. >=20 > > > > There can however be a benefit to e.g. determine an appropriate > > bitrate for a DASH session, depending on network load and/or coverage, > > but I would argue that out of band signaling is better in this case. > > [LH] One benefit of in-band signaling is it can provide the dynamic > > resource (like Q depth) to the source. By using this signal, we can > > distinguish congestion packet loss and random physical loss. It can > > increase the good-put for application as we described in the new draft. > [IJ] But isn't it better to use good AQMs instead as the goal should alwa= ys be > to avoid large standing queues ?. >=20 > [LH] Same as using L4S, AQM still try to provide the faired resource allo= cation > to all TCP flows by the rule of max-min fairness. This works well if the = link > capacity is big enough and all TCP flows will get what its application wa= nt. But > when the link is congested, we cannot give some critical application the > expected bandwidth, each flow will get the equal instantaneous bandwidth > determined the total number of flows. To overcome this difficulty caused = by > TCP fairness, we have to reserve the resource for some application and > exclude them from the resource sharing with others if the resource is not > enough (treat those flow differently as others, i.e, different > queuing/scheduler, etc). >=20 > > > > As regards to "worst case latency", I am not sure that I follow here, > > are we discussing TSN/Detnet technology here, general link failures, > > or is it about means to control the queue delay in the network ?. As > > to the latter, I believe that it is worthwhile to look more closely at = L4S. > > [LH] Yes, we want to control the delay for specified flow by change > > the queue/scheduler parameters. We believe only through such very fine > > control, we can achieve the expected service from application. We are > > in talk with detnet to see if they want an alternative solution other > > than PWE. L4S still only provides a statistical bounded latency when > > all hosts are upgraded to support L4S. For our solution, we don't need > > to change hosts if they don't want to use new TCP. > [IJ] The L4S issue is that of deployment but you will face similar deploy= ment > issues with inband QoS signaling, probably worse. L4S is basically very s= imple > technology whereas inband QoS implies more packet inspection and > processing. > And I believe that TSN/Detnet is a different story as it tries to achieve > extremely tight scheduling, so far in confined domains. >=20 > [LH] Yes, in-band signaling is more complicated technology. We are aware = of > this, and only report it as an informational or experiment draft. > In-band signaling does not need to program all network device. In real > deployment, only those aggregation device (may experience congestion) > such as GW, Edge router are required to be involved. Normally core router= s > link utilization is less than 60% or something like that. >=20 > > > > Regards > > Ingemar Johansson > > > > > > > Message: 2 > > > Date: Tue, 13 Mar 2018 19:27:18 +0000 > > > From: Lin Han > > > To: Toerless Eckert , Gorry Fairhurst > > > > > > Cc: Thomas Nadeau , "tcpm@ietf.org" > > > , "tsvwg@ietf.org" , "Scharf, > > Michael > > > (Nokia - DE/Stuttgart)" , > > > "tsvwg-chairs@ietf.org" , Katsushi Kobayashi > > > , Yingzhen Qu > > > Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda request= s > > > for TSVWG@IETF101) > > > Message-ID: > > > <1D30AF33624CDD4A99E8C395069A2A162CDB9BA3@sjceml521- > > > mbs.china.huawei.com> > > > > > > Content-Type: text/plain; charset=3D"us-ascii" > > > > > > Hi, Gorry/Toerless > > > > > > Here is some explanation and clarification for two drafts > > > (draft-han-tsvwg-cc and > > > draft-han-6man-in-band-signaling-for-transport-qos) > > > > > > 1. About draft-han-tsvwg-cc compared with other CC for bandwidth > > > guaranteed network, such as gTFRC. > > > draft-han-tsvwg-cc is a split draft from > > > draft-han-6man-in-band-signaling-for- > > > transport-qos . It proposes a new CC for a network if the TCP > > > session's bandwidth is guaranteed. Here the guaranteed bandwidth is > > > per TCP session and described by PIR/CIR and given directly by TCP > > > end > > user. > > > > > > 2. About TCP-QS and > > > draft-han-6man-in-band-signaling-for-transport-qos > > > >From my understanding, TCP-QS and > > > >draft-han-6man-in-band-signaling-for- > > > transport-qos do have similarity, both are kind of using in-band > > > signaling for the resource reservation. But they still have big diffe= rence. > > > 1). draft-han-6man-in-band-signaling-for-transport-qos is more > > > general > > > in- band signaling method, it not only applies to TCP, but also UDP > > > or other upper layer of protocol, even the draft only exemplifies > > > the method > > to TCP. > > > 2). draft-han-6man-in-band-signaling-for-transport-qos provides > > > reserved resource for bandwidth and latency for the whole life of > > > TCP session. It gives more flavors and more granularity for the QoS > > > (unlike TCP-QS only has 16 values of starting bandwidth). Moreover, > > > it can support the "worst case latency" at each hop; also, it can > > > support the OAM to detect the congestion states, and support the > > > "forwarding state" for host to be notified in real-time about if the > > > resource reservation or QoS forwarding is interrupted by abnormal > > > situation such as > > link/node failures. > > > > > > Best regards > > > > > > Lin > > > From nobody Sat Mar 17 04:51:42 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CF75112778E for ; Sat, 17 Mar 2018 04:51:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.23 X-Spam-Level: X-Spam-Status: No, score=-4.23 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5ON0fT2znfwQ for ; Sat, 17 Mar 2018 04:51:38 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D36961270A3 for ; Sat, 17 Mar 2018 04:51:37 -0700 (PDT) Received: from lhreml704-cah.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id 2DF1219348C7B; Sat, 17 Mar 2018 11:51:34 +0000 (GMT) Received: from SJCEML703-CHM.china.huawei.com (10.208.112.39) by lhreml704-cah.china.huawei.com (10.201.108.45) with Microsoft SMTP Server (TLS) id 14.3.382.0; Sat, 17 Mar 2018 11:51:35 +0000 Received: from SJCEML521-MBS.china.huawei.com ([169.254.2.168]) by SJCEML703-CHM.china.huawei.com ([169.254.5.179]) with mapi id 14.03.0382.000; Sat, 17 Mar 2018 04:51:32 -0700 From: Yingzhen Qu To: "Eggert, Lars" , Toerless Eckert CC: "Scharf, Michael (Nokia - DE/Stuttgart)" , Thomas Nadeau , "tcpm@ietf.org" Thread-Topic: [tcpm] [tsvwg] draft-han-tsvwg-cc Thread-Index: AQHTvNvC50kcphaiskyvoRPYdX2H0KPTVYcAgAAsYoCAAPqEgIAAS8UA Date: Sat, 17 Mar 2018 11:51:31 +0000 Message-ID: <51AE8AB2-B9D3-4266-A20D-BF269B69CD28@huawei.com> References: <20180316040208.GA9492@faui40p.informatik.uni-erlangen.de> <20180316162338.GD18047@faui40p.informatik.uni-erlangen.de> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.88.82] Content-Type: text/plain; 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a=rsa-sha256; c=relaxed/relaxed; d=cs.helsinki.fi; h=date:from:to:cc:subject:in-reply-to:message-id:references :mime-version:content-type:content-id; s=dkim20130528; bh=XJzK/p lPLk5Gq3OHfHpX54Qqbr/qDiIKGX+mRh0lV+w=; b=GNx9xn5+XFii36L96uI/37 F2gpzv+GbX8arrJo6+cHNhGFhBZ9FlwF9y4Pw/rQxmepT8dyIIzF6WB3kGZ5m1RQ 7DQdXDNvT+mM7O8kiU/LFsLO04vHaborWX/Eqi/r7fvw+hMjKPsVPppecgisYIky F6s8cRzynAyOKtOOIqu18= Received: from [192.168.254.6] (91-153-2-26.elisa-laajakaista.fi [91.153.2.26]) (AUTH: PLAIN kojo, TLS: TLSv1/SSLv3,256bits,AES256-SHA) by mail.cs.helsinki.fi with ESMTPSA; Sat, 17 Mar 2018 16:32:21 +0200 id 00000000005A0176.000000005AAD26F5.00002098 Date: Sat, 17 Mar 2018 16:32:00 +0200 (EET) From: Markku Kojo To: Michael Welzl cc: Michael Tuexen , tcpm@ietf.org In-Reply-To: Message-ID: References: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> User-Agent: Alpine 2.02 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="=_script-8370-1521297142-0001-2" Content-ID: Archived-At: Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2018 14:32:30 -0000 This is a MIME-formatted message. If you see this text it means that your E-mail software does not support MIME-formatted messages. --=_script-8370-1521297142-0001-2 Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: quoted-printable Content-ID: Hi Michael, see inline. On Sat, 17 Mar 2018, Michael Welzl wrote: > Dear Markku, > > Thank you very much for reading this! > Answers in line below: > > >> On Mar 17, 2018, at 1:52 AM, Markku Kojo wrote: >> >> Hi all, >> >> Maybe slightly late wg last call review of draft-ietf-tcpm-alternative= backoff-ecn-06. >> >> The draft is mostly well written and clear, and it is also improved si= nce version -00 or -01 I last read it. >> >> I believe the intention of the draft is just to allow and propose expe= rimentation using a larger multiplicative decrease factor when responding = to ECN indication than when responding to packet loss. >> >> There is, however, a significant change that seem to have occured from = version -04 to -05 that does much more than this and is therefore crucial = to address properly. The text and reads now in -06 as follows: >> >> >> It updates the following text in section 6.1.2 of the ECN >> specification [RFC3168] : >> >> The indication of congestion should be treated just as a >> congestion loss in non-ECN-Capable TCP. That is, the TCP source >> halves the congestion window "cwnd" and reduces the slow start >> threshold "ssthresh". >> >> Replacing this with: >> >> Receipt of a packet with the ECN-Echo flag SHOULD trigger the TCP >> source to set the slow start threshold (ssthresh) to 0.8 times the >> FlightSize, with a lower bound of 2 * SMSS applied to the result. >> As in [RFC5681], the TCP sender also reduces the cwnd value to no >> more than the new ssthresh value. >> >> >> >> And is further clarified in Section 4.3: >> >> >> and in response to an indication of an ECN-signalled congestion: >> >> ssthresh =3D max (FlightSize * beta_{ecn}, 2 * SMSS) >> >> and >> >> cwnd =3D ssthresh >> >> >> >> In my reading this text above sets a lower bound of 2 MSS for cwnd whi= ch is incorrect and dangerous modification and maybe not intended to modi= fy RFC 3168. > > Just to be clear, indeed we absolutely did not intend to change the spe= c here - however we thought we need to be clearer. > > Consider the original text: > *** > The indication of congestion should be treated just as a > congestion loss in non-ECN-Capable TCP. That is, the TCP source > halves the congestion window "cwnd" and reduces the slow start > threshold "ssthresh=E2=80=9D. > *** > > Because this simply says =E2=80=9Creduces=E2=80=9D about ssthresh witho= ut specifying in detail how to reduce it, it would seem obvious (due to t= he first sentence) that this refers to eqn. 4 in RFC 5681. However, if we = say =E2=80=9C...set the slow start threshold (ssthresh) to 0.8 times the = FlightSize=E2=80=9D, then we lose the lower bound. This is why we introdu= ced it for ssthresh. Clarifying ssthresh reduction is all welcome and fine. > As for cwnd, I find the original text to be contradictory in this respe= ct (unless I=E2=80=99m missing something). =E2=80=9CThe indication of con= gestion should be treated just as a congestion loss in non-ECN-Capable TC= P. =E2=80=9C =3D> this, to me, means doing the same as specified in RFC 5= 681 - but in RFC 5681, I couldn=E2=80=99t see any text that allows cwnd t= o go below 2 MSS upon a =E2=80=9Ccongestion loss=E2=80=9D (assuming this = is not a timeout - where you=E2=80=99re right, our text wrongly quoted RF= C 5681 there, but that=E2=80=99s a separate issue further below). With loss-based CC a crucial part of inferring congestion is via timeout=20 and that takes cwnd to 1 MSS. ECN response must follow the similar way of=20 reducing in the same situation (see below). > ( Maybe you mean *during*, not after fast recovery? But that would be c= onfusing, as cwnd is also =E2=80=9Cinflated=E2=80=9D in this phase in RFC = 5681, which I hope we don=E2=80=99t do in response to ECE. ) I'm not saying anything about "during" fast recovery. It's another story=20 and not subject to this draft, I believe. > However, RFC 3168, in the second sentence, beginning with =E2=80=9CThat = is, =E2=80=9C (indicating that this is just a clarification), states that = the TCP sources halves cwnd. Yes, meaning that cwnd is halved until it reaches 1 MSS (i.e., also when=20 cwnd=3D2) after which further rate reduction is via timer. > >> The lower bound for cwnd is 1 MSS. The lower bound of 2 MSS for cwnd >> >> 1) is not specified in any (standards track) RFC, >> 2) is against the congestion control principles for avoiding >> congestion collapse as it effectively disables a full back >> off that is a crucial requirement for all congestion control >> algorithms, >> 3) is in conflict with the basic principle set in Sally's ECN papers >> and in RFC 3168 itself (the original text above from RFC 3168): >> >> "The indication of congestion should be treated just as a >> congestion loss in non-ECN-Capable TCP." >> >> When Flightsize (and cwnd) is 2 MSS in non-ECN-Capable TCP and loss >> signals congestion, cwnd effectively becomes 1 MSS. That is why RFC >> 3168 formulates the text: "the TCP source halves the congestion >> window "cwnd" =E2=80=A6" > > See above, regarding this text. We certainly don=E2=80=99t want to chan= ge these principles but tried to be correct about what should happen, and = found the quoted text here to be contradictory. The original text from RFC 3168 could admittedly be more clearer in how t= o=20 reach cwnd =3D 1 MSS. It is very clear on what to do when cwnd =3D 1 MSS = is=20 reached. So, why to discuss it, if we don't ever allow reaching cwnd=3D1?=20 When ECN is operating ideally we'll never see RTO, so we would never reac= h=20 cwnd =3D 1 MSS if cwnd is lower bounded to 2 MSS (except in case we start=20 with IW =3D 1 MSS and immediately receive ECE). I don't see the quoted text here being contradictory if we think what=20 happens in loss-based CC, when cwnd =3D 2 MSS and either or both=20 of the pkts in flight are dropped. In such case congestion is signalled via timeout (*) and cwnd is reduced to 1 MSS as the TCP=20 sender is unable to get three dupacks but at most one dupack. (*) Limited Transmit introduces an exception to this but it was carefully=20 designed not to modify congestion control principles. If cwnd =3D 2 MSS a= nd=20 one segment is dropped, Limited Transmit transmits one segment per RTT=20 over the period of two following RTTs, i.e., it effectively reduces=20 sending rate to 1 MSS / RTT even though cwnd is not reduced to 1 MSS.=20 This is allowed because the Limited Transmit triggered dupacks=20 indicate that there is no heavy congestion and rate reduction=20 realizes implicitly. >> Note: the majority of the work and text in RFC 3168, including >> the text in RFC 2482, predates RFC 2581 that first introduced >> FlightSize. Prior to RFC 2581 all TCP CC text "halved cwnd" >> which literally meant cwnd=3Dcwnd/2. > > I know that, and I thought that this is the reason for the problem with = this text (due to updates of the non-ECN CC text). > Yes, unfortunately RFC 3168 did not get aligned with RFC 2581 introductio= n=20 of FlightSize when they both were finalized around the same time. >> Instead of the above text in the draft, the draft should explicitly st= ate that when FlightSize/2 would result in ssthresh below its lower bound = of 2 MSS, a TCP sender must not stop decreasing cwnd. And, if more ECN-si= gnalled congestion indications arrive, the TCP sender must continue reduc= ing sending rate further (plus refer to RFC 3168 how to proceed reducing = the sending rate, if further ECE signals arrive). > > Technically this makes sense to me, but I=E2=80=99m not currently readi= ng RFC 3168 this way. We might then disagree here ;) In case we want continue with the lower bound for cwnd being 2 MSS, it=20 must be justified, I think. However, I find it dangerous as it would lead=20 to huge delays in a setting where the physical buffer of a bottleneck=20 AQM-enabled router is large or huge (quite typical today) and the offered=20 load goes very high such that the share per flow at the bottleneck router=20 becomes less than 2 MSS. When offered load is further increased, none of=20 the ECN senders will respond to ECN signals and queue builds high. This=20 is also very bad for any non-ECT flows that share the same bottleneck as=20 they will be locked-out totally and the non-ECT flows will encounter=20 unfair, "selective" congestion collapse. I know Sally has been very careful in designing ECN response and therefor= e=20 I have no doubt how to intepret RFC 3168 in this regard. >> Furthermore, the draft should be very specific on how the TCP sender s= hould act when cwnd=3Dssthresh and ECE arrives. Currently the draft speci= fies the way how the TCP sender reduces ssthresh (and cwnd) in Congestion = Avoidance. According to RFC 5681, when cwnd =3D ssthresh, TCP is not in S= low Start nor in Congestion Avoidance. Therefore, the draft should be exp= licit on how cwnd is reduced, when cwnd=3Dssthresh. > > Why? RFC 5681 states =E2=80=9CWhen cwnd and ssthresh are equal, the sen= der may use either slow start or congestion avoidance.=E2=80=9D - so if y= ou're an implementer, this basically tells you that you have to make a de= cision on your own for the cwnd =3D=3D sthresh case. We specify how to be= have when you=E2=80=99re in congestion avoidance - thus it depends on the = decision you=E2=80=99ve taken for this case. Yes, but RFC 5681 does not make any difference in how to decrease cwnd in=20 Slow Start and CA but ABE does. RFC 5681 only discusses that it is=20 implementors choice how to *increase* cwnd in this case but here we=20 discuss how to decrease cwnd that is more crucial decision and the=20 decision what to do maybe should be considered more carefully as=20 RFC 5681 does not give any recommendation in this respect. I have not given much thinking to this, so not sure if it makes much=20 difference, but discussing it is in place to judge whether or not it=20 matters, I think. E.g, in an (ideal) ECN-enabled environment we don't expect to see loss,=20 but if it occurs due to congestion it is possibly an indication of=20 heavy congestion (it may also be that there are non-ECN capable routers o= n=20 the path that get congested). Now, if we have loss and Fast Recovery=20 repairs the loss, we set cwnd=3Dssthresh when Fast Recovery completes. If=20 ECE arrives immediately after Fast Recovery, the implementor needs to=20 decide whether to use ABE factor of 0.8 or be more conservative. In this=20 case we may want to be more conservative to avoid further loss, if we=20 think that the loss event was due to heavy congestion. I don't know. This is potentially also something we may want to explore in the upcoming=20 experimentations, so it would be worth of a few sentences in the draft to=20 clarify what to do in this "gray area" (like RFC 5681 clarifies the "gray=20 area"). > >> It is true that there is (at least) one (widely deployed) incorrect im= plementation of RFC 3168 that incorrectly sets lower bound of 2 MSS for c= wnd when congestion is ECN-signaled. This, however, must not be used as a= ny kind of justification for chang=C3=ADng IETF-specified congestion cont= rol principles and requirements. Instead, this draft should carefully ins= truct implementors and those who intend to experiment with the ECN modifi= cation set in this draft to ensure the TCP stack used for experiments cor= rectly implements RFC 3168 in this respect. Otherwise, such experimental = results are mostly void. > > Maybe the person behind this implementation was as confused by the RFC = 3168 as I am =E2=80=A6 clearly we didn=E2=80=99t intend to change the pri= nciples. Quite likely so. Unharmonized RFC 3168 and RFC 2581 (and later RFC 5681)=20 do not help in this. Cheers, /Markku >> In addition, there is an incorrect statement in Sec 4.1: >> >> According to >> [RFC5681], when a TCP sender detects segment loss using the >> retransmission timer and the given segment has not yet been resent by >> way of the retransmission timer, the value of ssthresh must be set to >> no more of the maximum of half of the FlightSize and 2*SMSS. The >> same equation is also used during Fast Retransmit/Fast Recovery >> [RFC5681]. As a result, the TCP congestion control only allows one >> BDP of packets in flight. This is just sufficient to maintain 100% >> utilisation of the bottleneck on the network path. >> >> >> What the text says about setting ssthresh is correct. However, if the = segment loss is detected using the retransmission timer, the TCP >> congestion control does not allow one BDP of packets in flight (unless = BDP=3D1 MSS). Instead, cwnd is set to 1 MSS, allowing only 1 pkt in fligh= t. >> >> I suggest removing the text that discusses detecting segment loss usin= g the retransmission timer. > > Good catch, thanks! > > Cheers, > Michael > > --=_script-8370-1521297142-0001-2-- From nobody Sat Mar 17 09:07:53 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8B30612025C; Sat, 17 Mar 2018 09:07:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.229 X-Spam-Level: X-Spam-Status: No, score=-4.229 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rLkG68NJ9d_W; Sat, 17 Mar 2018 09:07:41 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5DF0A129C70; Sat, 17 Mar 2018 09:07:40 -0700 (PDT) Received: from lhreml701-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id 4C5142658A5BA; Sat, 17 Mar 2018 16:07:37 +0000 (GMT) Received: from SJCEML701-CHM.china.huawei.com (10.208.112.40) by lhreml701-cah.china.huawei.com (10.201.108.42) with Microsoft SMTP Server (TLS) id 14.3.382.0; Sat, 17 Mar 2018 16:07:38 +0000 Received: from SJCEML521-MBS.china.huawei.com ([169.254.2.168]) by SJCEML701-CHM.china.huawei.com ([169.254.3.93]) with mapi id 14.03.0382.000; Sat, 17 Mar 2018 09:07:35 -0700 From: Yingzhen Qu To: "Scharf, Michael (Nokia - DE/Stuttgart)" , "draft-han-tsvwg-cc@ietf.org" CC: "tcpm@ietf.org" , "tsvwg@ietf.org" , "iccrg@irtf.org" Thread-Topic: Questions on draft-han-tsvwg-cc-00 Thread-Index: AdO8pkvfd4lsbPnoT7CbLbNzdShcRwBnm4KA Date: Sat, 17 Mar 2018 16:07:34 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.87.39] Content-Type: multipart/alternative; boundary="_000_EB58F23FC5614D9DA92643ED428F36D5huaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [tcpm] Questions on draft-han-tsvwg-cc-00 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2018 16:07:43 -0000 --_000_EB58F23FC5614D9DA92643ED428F36D5huaweicom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgTWljaGFlbCwNCg0KVGhhbmtzIGZvciB0aGVzZSB2ZXJ5IGhlbHBmdWwgY29tbWVudHMuIFBs 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with ESMTP id 502E51270FC for ; Sat, 17 Mar 2018 10:05:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.209 X-Spam-Level: X-Spam-Status: No, score=-4.209 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AhqCYoNqHfFd for ; Sat, 17 Mar 2018 10:04:57 -0700 (PDT) Received: from mail-out01.uio.no (mail-out01.uio.no [IPv6:2001:700:100:10::50]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 48EA3128D2E for ; Sat, 17 Mar 2018 10:04:57 -0700 (PDT) Received: from mail-mx04.uio.no ([129.240.10.25]) by mail-out01.uio.no with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1exFGG-00052L-LV; Sat, 17 Mar 2018 18:04:52 +0100 Received: from 93-58-133-64.ip158.fastwebnet.it ([93.58.133.64] helo=[10.0.0.10]) by mail-mx04.uio.no with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) user michawe (Exim 4.90_1) (envelope-from ) id 1exFGE-000ENk-6p; Sat, 17 Mar 2018 18:04:52 +0100 From: Michael Welzl Message-Id: <9342CFB0-D086-4CB3-B301-228B7CCBDAFB@ifi.uio.no> Content-Type: multipart/alternative; boundary="Apple-Mail=_CE108572-7521-4DD1-B22D-D389855370F6" Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Date: Sat, 17 Mar 2018 18:04:46 +0100 In-Reply-To: Cc: Michael Tuexen , tcpm@ietf.org To: Markku Kojo References: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> X-Mailer: Apple Mail (2.3273) X-UiO-SPF-Received: Received-SPF: neutral (mail-mx04.uio.no: 93.58.133.64 is neither permitted nor denied by domain of ifi.uio.no) client-ip=93.58.133.64; envelope-from=michawe@ifi.uio.no; helo=[10.0.0.10]; X-UiO-Spam-info: not spam, SpamAssassin (score=-4.9, required=5.0, autolearn=disabled, AWL=0.075, HTML_MESSAGE=0.001, TVD_RCVD_IP=0.001, UIO_MAIL_IS_INTERNAL=-5, uiobl=NO, uiouri=NO) X-UiO-Scanned: 9465BFCB5BCC72A63C60722BBB2A5B5D1F55BBF7 Archived-At: Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2018 17:05:01 -0000 --Apple-Mail=_CE108572-7521-4DD1-B22D-D389855370F6 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi, Answers below: > On Mar 17, 2018, at 3:32 PM, Markku Kojo wrote: >=20 > Hi Michael, >=20 > see inline. >=20 > On Sat, 17 Mar 2018, Michael Welzl wrote: >=20 >> Dear Markku, >>=20 >> Thank you very much for reading this! >> Answers in line below: >>=20 >>=20 >>> On Mar 17, 2018, at 1:52 AM, Markku Kojo = wrote: >>>=20 >>> Hi all, >>>=20 >>> Maybe slightly late wg last call review of = draft-ietf-tcpm-alternativebackoff-ecn-06. >>>=20 >>> The draft is mostly well written and clear, and it is also improved = since version -00 or -01 I last read it. >>>=20 >>> I believe the intention of the draft is just to allow and propose = experimentation using a larger multiplicative decrease factor when = responding to ECN indication than when responding to packet loss. >>>=20 >>> There is, however, a significant change that seem to have occured = from version -04 to -05 that does much more than this and is therefore = crucial to address properly. The text and reads now in -06 as follows: >>>=20 >>>=20 >>> It updates the following text in section 6.1.2 of the ECN >>> specification [RFC3168] : >>>=20 >>> The indication of congestion should be treated just as a >>> congestion loss in non-ECN-Capable TCP. That is, the TCP source >>> halves the congestion window "cwnd" and reduces the slow start >>> threshold "ssthresh". >>>=20 >>> Replacing this with: >>>=20 >>> Receipt of a packet with the ECN-Echo flag SHOULD trigger the TCP >>> source to set the slow start threshold (ssthresh) to 0.8 times = the >>> FlightSize, with a lower bound of 2 * SMSS applied to the result. >>> As in [RFC5681], the TCP sender also reduces the cwnd value to no >>> more than the new ssthresh value. >>>=20 >>>=20 >>>=20 >>> And is further clarified in Section 4.3: >>>=20 >>>=20 >>> and in response to an indication of an ECN-signalled congestion: >>>=20 >>> ssthresh =3D max (FlightSize * beta_{ecn}, 2 * SMSS) >>>=20 >>> and >>>=20 >>> cwnd =3D ssthresh >>>=20 >>>=20 >>>=20 >>> In my reading this text above sets a lower bound of 2 MSS for cwnd = which is incorrect and dangerous modification and maybe not intended to = modify RFC 3168. >>=20 >> Just to be clear, indeed we absolutely did not intend to change the = spec here - however we thought we need to be clearer. >>=20 >> Consider the original text: >> *** >> The indication of congestion should be treated just as a >> congestion loss in non-ECN-Capable TCP. That is, the TCP source >> halves the congestion window "cwnd" and reduces the slow start >> threshold "ssthresh=E2=80=9D. >> *** >>=20 >> Because this simply says =E2=80=9Creduces=E2=80=9D about ssthresh = without specifying in detail how to reduce it, it would seem obvious = (due to the first sentence) that this refers to eqn. 4 in RFC 5681. = However, if we say =E2=80=9C...set the slow start threshold (ssthresh) = to 0.8 times the FlightSize=E2=80=9D, then we lose the lower bound. This = is why we introduced it for ssthresh. >=20 > Clarifying ssthresh reduction is all welcome and fine. >=20 >> As for cwnd, I find the original text to be contradictory in this = respect (unless I=E2=80=99m missing something). =E2=80=9CThe indication = of congestion should be treated just as a congestion loss in = non-ECN-Capable TCP. =E2=80=9C =3D> this, to me, means doing the same as = specified in RFC 5681 - but in RFC 5681, I couldn=E2=80=99t see any text = that allows cwnd to go below 2 MSS upon a =E2=80=9Ccongestion loss=E2=80=9D= (assuming this is not a timeout - where you=E2=80=99re right, our text = wrongly quoted RFC 5681 there, but that=E2=80=99s a separate issue = further below). >=20 > With loss-based CC a crucial part of inferring congestion is via = timeout and that takes cwnd to 1 MSS. ECN response must follow the = similar way of reducing in the same situation (see below). >=20 >> ( Maybe you mean *during*, not after fast recovery? But that would be = confusing, as cwnd is also =E2=80=9Cinflated=E2=80=9D in this phase in = RFC 5681, which I hope we don=E2=80=99t do in response to ECE. ) >=20 > I'm not saying anything about "during" fast recovery. It's another = story and not subject to this draft, I believe. >=20 >> However, RFC 3168, in the second sentence, beginning with =E2=80=9CThat= is, =E2=80=9C (indicating that this is just a clarification), states = that the TCP sources halves cwnd. >=20 > Yes, meaning that cwnd is halved until it reaches 1 MSS (i.e., also = when cwnd=3D2) after which further rate reduction is via timer. >>=20 >>> The lower bound for cwnd is 1 MSS. The lower bound of 2 MSS for cwnd >>>=20 >>> 1) is not specified in any (standards track) RFC, >>> 2) is against the congestion control principles for avoiding >>> congestion collapse as it effectively disables a full back >>> off that is a crucial requirement for all congestion control >>> algorithms, >>> 3) is in conflict with the basic principle set in Sally's ECN papers >>> and in RFC 3168 itself (the original text above from RFC 3168): >>>=20 >>> "The indication of congestion should be treated just as a >>> congestion loss in non-ECN-Capable TCP." >>>=20 >>> When Flightsize (and cwnd) is 2 MSS in non-ECN-Capable TCP and loss >>> signals congestion, cwnd effectively becomes 1 MSS. That is why RFC >>> 3168 formulates the text: "the TCP source halves the congestion >>> window "cwnd" =E2=80=A6" >>=20 >> See above, regarding this text. We certainly don=E2=80=99t want to = change these principles but tried to be correct about what should = happen, and found the quoted text here to be contradictory. >=20 > The original text from RFC 3168 could admittedly be more clearer in = how to reach cwnd =3D 1 MSS. It is very clear on what to do when cwnd =3D = 1 MSS is reached. So, why to discuss it, if we don't ever allow reaching = cwnd=3D1? When ECN is operating ideally we'll never see RTO, so we would = never reach cwnd =3D 1 MSS if cwnd is lower bounded to 2 MSS (except in = case we start with IW =3D 1 MSS and immediately receive ECE). Sorry, I overlooked this discussion - > I don't see the quoted text here being contradictory if we think what = happens in loss-based CC, when cwnd =3D 2 MSS and either or both of the = pkts in flight are dropped. In such case congestion > is signalled via timeout (*) and cwnd is reduced to 1 MSS as the TCP = sender is unable to get three dupacks but at most one dupack. >=20 > (*) Limited Transmit introduces an exception to this but it was = carefully designed not to modify congestion control principles. If cwnd = =3D 2 MSS and one segment is dropped, Limited Transmit transmits one = segment per RTT over the period of two following RTTs, i.e., it = effectively reduces sending rate to 1 MSS / RTT even though cwnd is not = reduced to 1 MSS. This is allowed because the Limited Transmit triggered = dupacks indicate that there is no heavy congestion and rate reduction = realizes implicitly. >=20 >>> Note: the majority of the work and text in RFC 3168, including >>> the text in RFC 2482, predates RFC 2581 that first introduced >>> FlightSize. Prior to RFC 2581 all TCP CC text "halved cwnd" >>> which literally meant cwnd=3Dcwnd/2. >>=20 >> I know that, and I thought that this is the reason for the problem = with this text (due to updates of the non-ECN CC text). >>=20 > Yes, unfortunately RFC 3168 did not get aligned with RFC 2581 = introduction of FlightSize when they both were finalized around the same = time. >=20 >>> Instead of the above text in the draft, the draft should explicitly = state that when FlightSize/2 would result in ssthresh below its lower = bound of 2 MSS, a TCP sender must not stop decreasing cwnd. And, if more = ECN-signalled congestion indications arrive, the TCP sender must = continue reducing sending rate further (plus refer to RFC 3168 how to = proceed reducing the sending rate, if further ECE signals arrive). >>=20 >> Technically this makes sense to me, but I=E2=80=99m not currently = reading RFC 3168 this way. >=20 > We might then disagree here ;) >=20 > In case we want continue with the lower bound for cwnd being 2 MSS, it = must be justified, I think. However, I find it dangerous as it would = lead to huge delays in a setting where the physical buffer of a = bottleneck AQM-enabled router is large or huge (quite typical today) and = the offered load goes very high such that the share per flow at the = bottleneck router becomes less than 2 MSS. When offered load is further = increased, none of the ECN senders will respond to ECN signals and queue = builds high. This is also very bad for any non-ECT flows that share the = same bottleneck as they will be locked-out totally and the non-ECT flows = will encounter unfair, "selective" congestion collapse. >=20 > I know Sally has been very careful in designing ECN response and = therefore I have no doubt how to intepret RFC 3168 in this regard. I=E2=80=99ll repeat that we never intended to change anything else but = the backoff factor. The wording change was the result of having to be more explicit (because = we can=E2=80=99t simply say =E2=80=9Csimilar to loss=E2=80=9D, which = automatically refers back to RFC 5681 rules). Thus, I think we agree = that this is just an editorial fix. >>> Furthermore, the draft should be very specific on how the TCP sender = should act when cwnd=3Dssthresh and ECE arrives. Currently the draft = specifies the way how the TCP sender reduces ssthresh (and cwnd) in = Congestion Avoidance. According to RFC 5681, when cwnd =3D ssthresh, TCP = is not in Slow Start nor in Congestion Avoidance. Therefore, the draft = should be explicit on how cwnd is reduced, when cwnd=3Dssthresh. >>=20 >> Why? RFC 5681 states =E2=80=9CWhen cwnd and ssthresh are equal, the = sender may use either slow start or congestion avoidance.=E2=80=9D - so = if you're an implementer, this basically tells you that you have to make = a decision on your own for the cwnd =3D=3D sthresh case. We specify how = to behave when you=E2=80=99re in congestion avoidance - thus it depends = on the decision you=E2=80=99ve taken for this case. >=20 > Yes, but RFC 5681 does not make any difference in how to decrease cwnd = in Slow Start and CA but ABE does. RFC 5681 only discusses that it is = implementors choice how to *increase* cwnd in this case but here we = discuss how to decrease cwnd that is more crucial decision and the = decision what to do maybe should be considered more carefully as RFC = 5681 does not give any recommendation in this respect. >=20 > I have not given much thinking to this, so not sure if it makes much = difference, but discussing it is in place to judge whether or not it = matters, I think. >=20 > E.g, in an (ideal) ECN-enabled environment we don't expect to see = loss, but if it occurs due to congestion it is possibly an indication of = heavy congestion (it may also be that there are non-ECN capable routers = on the path that get congested). Now, if we have loss and Fast Recovery = repairs the loss, we set cwnd=3Dssthresh when Fast Recovery completes. = If ECE arrives immediately after Fast Recovery, the implementor needs to = decide whether to use ABE factor of 0.8 or be more conservative. In this = case we may want to be more conservative to avoid further loss, if we = think that the loss event was due to heavy congestion. I don't know. >=20 > This is potentially also something we may want to explore in the = upcoming experimentations, so it would be worth of a few sentences in = the draft to clarify what to do in this "gray area" (like RFC 5681 = clarifies the "gray area=E2=80=9D). OK, I agree Cheers, Michael >>> It is true that there is (at least) one (widely deployed) incorrect = implementation of RFC 3168 that incorrectly sets lower bound of 2 MSS = for cwnd when congestion is ECN-signaled. This, however, must not be = used as any kind of justification for chang=C3=ADng IETF-specified = congestion control principles and requirements. Instead, this draft = should carefully instruct implementors and those who intend to = experiment with the ECN modification set in this draft to ensure the TCP = stack used for experiments correctly implements RFC 3168 in this = respect. Otherwise, such experimental results are mostly void. >>=20 >> Maybe the person behind this implementation was as confused by the = RFC 3168 as I am =E2=80=A6 clearly we didn=E2=80=99t intend to change = the principles. >=20 > Quite likely so. Unharmonized RFC 3168 and RFC 2581 (and later RFC = 5681) do not help in this. >=20 > Cheers, >=20 > /Markku >=20 >>> In addition, there is an incorrect statement in Sec 4.1: >>>=20 >>> According to >>> [RFC5681], when a TCP sender detects segment loss using the >>> retransmission timer and the given segment has not yet been resent = by >>> way of the retransmission timer, the value of ssthresh must be set = to >>> no more of the maximum of half of the FlightSize and 2*SMSS. The >>> same equation is also used during Fast Retransmit/Fast Recovery >>> [RFC5681]. As a result, the TCP congestion control only allows one >>> BDP of packets in flight. This is just sufficient to maintain 100% >>> utilisation of the bottleneck on the network path. >>>=20 >>>=20 >>> What the text says about setting ssthresh is correct. However, if = the segment loss is detected using the retransmission timer, the TCP >>> congestion control does not allow one BDP of packets in flight = (unless BDP=3D1 MSS). Instead, cwnd is set to 1 MSS, allowing only 1 pkt = in flight. >>>=20 >>> I suggest removing the text that discusses detecting segment loss = using the retransmission timer. >>=20 >> Good catch, thanks! >>=20 >> Cheers, >> Michael --Apple-Mail=_CE108572-7521-4DD1-B22D-D389855370F6 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hi,

Answers= below:

On = Mar 17, 2018, at 3:32 PM, Markku Kojo <kojo@cs.helsinki.fi>= wrote:

Hi Michael,
see inline.

On Sat, 17 Mar 2018, Michael Welzl = wrote:

Dear Markku,
Thank you very much for reading this!
Answers = in line below:


On Mar 17, 2018, at 1:52 AM, Markku Kojo <kojo@cs.helsinki.fi>= wrote:

Hi all,

Maybe slightly late wg last call review of = draft-ietf-tcpm-alternativebackoff-ecn-06.

The draft is mostly well written and clear, and it is also = improved since version -00 or -01 I last read it.

I believe the intention of the draft is just to allow and = propose experimentation using a larger multiplicative decrease factor = when responding to ECN indication than when responding to packet = loss.

There is, however, a significant = change that seem to have occured from version -04 to -05 that does much = more than this and is therefore crucial to address properly. The text = and reads now in -06 as follows:


It updates the following text in section 6.1.2 of the ECN
specification [RFC3168] :

   The indication of congestion should be = treated just as a
   congestion loss in = non-ECN-Capable TCP.  That is, the TCP source
   halves the congestion window "cwnd" and = reduces the slow start
   threshold = "ssthresh".

Replacing this with:

   Receipt of a packet with the = ECN-Echo flag SHOULD trigger the TCP
   source to set the slow start threshold = (ssthresh) to 0.8 times the
   FlightSize, = with a lower bound of 2 * SMSS applied to the result.
   As in [RFC5681], the TCP sender also = reduces the cwnd value to no
   more than = the new ssthresh value.



And is further clarified in Section 4.3:


and in response to an indication of an = ECN-signalled congestion:

     ssthresh =3D max (FlightSize * = beta_{ecn}, 2 * SMSS)

     and

     cwnd =3D ssthresh



In my reading = this text above sets a lower bound of 2 MSS for cwnd which is incorrect = and dangerous modification and maybe not intended to modify RFC 3168.

Just to be clear, indeed we = absolutely did not intend to change the spec here - however we thought = we need to be clearer.

Consider the = original text:
***
  The = indication of congestion should be treated just as a
  congestion loss in non-ECN-Capable TCP. =  That is, the TCP source
  halves the = congestion window "cwnd" and reduces the slow start
  threshold "ssthresh=E2=80=9D.
***

Because this simply says =E2=80=9Creduces=E2=80=9D= about ssthresh without specifying in detail how to reduce it, it would = seem obvious (due to the first sentence) that this refers to eqn. 4 in = RFC 5681. However, if we say =E2=80=9C...set the slow start threshold = (ssthresh) to 0.8 times the FlightSize=E2=80=9D, then we lose the lower = bound. This is why we introduced it for ssthresh.

Clarifying ssthresh reduction is all = welcome and fine.

As for cwnd, I find the = original text to be contradictory in this respect (unless I=E2=80=99m = missing something). =E2=80=9CThe indication of congestion should be = treated just as a congestion loss in non-ECN-Capable TCP. =E2=80=9C = =3D> this, to me, means doing the same as specified in RFC 5681 - but = in RFC 5681, I couldn=E2=80=99t see any text that allows cwnd to go = below 2 MSS upon a =E2=80=9Ccongestion loss=E2=80=9D (assuming this is = not a timeout - where you=E2=80=99re right, our text wrongly quoted RFC = 5681 there, but that=E2=80=99s a separate issue further below).

With loss-based CC a crucial part of = inferring congestion is via timeout and that takes cwnd to 1 MSS. ECN = response must follow the similar way of reducing in the same situation = (see below).

( Maybe you mean *during*, = not after fast recovery? But that would be confusing, as cwnd is also = =E2=80=9Cinflated=E2=80=9D in this phase in RFC 5681, which I hope we = don=E2=80=99t do in response to ECE. )

I'm not saying anything about "during" fast = recovery. It's another story and not subject to this draft, I = believe.

However, RFC 3168, in the = second sentence, beginning with =E2=80=9CThat is, =E2=80=9C (indicating = that this is just a clarification), states that the TCP sources halves = cwnd.

Yes, meaning that cwnd is halved = until it reaches 1 MSS (i.e., also when cwnd=3D2) after which further = rate reduction is via timer.

The lower bound for cwnd is 1 MSS. The lower = bound of 2 MSS for cwnd

1) is not specified = in any (standards track) RFC,
2) is against the congestion = control principles for avoiding
 congestion collapse = as it effectively disables a full back
 off that is a = crucial requirement for all congestion control
 algorithms,
3) is in conflict with the = basic principle set in Sally's ECN papers
 and in RFC = 3168 itself (the original text above from RFC 3168):

 "The indication of congestion should be treated just as = a
  congestion loss in non-ECN-Capable TCP."

 When Flightsize (and cwnd) is 2 MSS in = non-ECN-Capable TCP and loss
 signals congestion, = cwnd effectively becomes 1 MSS. That is why RFC
 3168 = formulates the text: "the TCP source halves the congestion
 window "cwnd" =E2=80=A6"

See above, regarding this text. We certainly don=E2=80=99t = want to change these principles but tried to be correct about what = should happen, and found the quoted text here to be contradictory.

The original text from RFC 3168 could = admittedly be more clearer in how to reach cwnd =3D 1 MSS. It is very = clear on what to do when cwnd =3D 1 MSS is reached. So, why to discuss = it, if we don't ever allow reaching cwnd=3D1? When ECN is operating = ideally we'll never see RTO, so we would never reach cwnd =3D 1 MSS if = cwnd is lower bounded to 2 MSS (except in case we start with IW =3D 1 = MSS and immediately receive ECE).

Sorry, I = overlooked this discussion -


I don't see the quoted text here being = contradictory if we think what happens in loss-based CC, when cwnd =3D 2 = MSS and either or both of the pkts in flight are dropped. In such case = congestion
is signalled via timeout (*) and cwnd is = reduced to 1 MSS as the TCP sender is unable to get three dupacks but at = most one dupack.

(*) Limited Transmit introduces = an exception to this but it was carefully designed not to modify = congestion control principles. If cwnd =3D 2 MSS and one segment is = dropped, Limited Transmit transmits one segment per RTT over the period = of two following RTTs, i.e., it effectively reduces sending rate to 1 = MSS / RTT even though cwnd is not reduced to 1 MSS. This is allowed = because the Limited Transmit triggered dupacks indicate that there is no = heavy congestion and rate reduction realizes implicitly.
 Note: the majority of the work and text in RFC 3168, = including
 the text in RFC 2482, predates RFC 2581 = that first introduced
 FlightSize. Prior to RFC 2581 = all TCP CC text "halved cwnd"
 which literally meant = cwnd=3Dcwnd/2.

I know that, = and I thought that this is the reason for the problem with this text = (due to updates of the non-ECN CC text).

Yes, unfortunately RFC 3168 did not get = aligned with RFC 2581 introduction of FlightSize when they both were = finalized around the same time.

Instead of the above text in the draft, the draft should = explicitly state that when FlightSize/2 would result in ssthresh below = its lower bound of 2 MSS, a TCP sender must not stop decreasing cwnd. = And, if more ECN-signalled congestion indications arrive, the TCP sender = must continue reducing sending rate further (plus refer to RFC 3168 how = to proceed reducing the sending rate, if further ECE signals arrive).

Technically this makes sense to = me, but I=E2=80=99m not currently reading RFC 3168 this way.

We might then disagree here ;)
In case we want continue with the lower bound = for cwnd being 2 MSS, it must be justified, I think. However, I find it = dangerous as it would lead to huge delays in a setting where the = physical buffer of a bottleneck AQM-enabled router is large or huge = (quite typical today) and the offered load goes very high such that the = share per flow at the bottleneck router becomes less than 2 MSS. When = offered load is further increased, none of the ECN senders will respond = to ECN signals and queue builds high. This is also very bad for any = non-ECT flows that share the same bottleneck as they will be locked-out = totally and the non-ECT flows will encounter unfair, "selective" = congestion collapse.

I know Sally has been very careful in designing = ECN response and therefore I have no doubt how to intepret RFC 3168 in = this regard.

I=E2=80=99ll repeat that we never intended to = change anything else but the backoff factor.
The wording = change was the result of having to be more explicit (because we can=E2=80=99= t simply say =E2=80=9Csimilar to loss=E2=80=9D, which automatically = refers back to RFC 5681 rules). Thus, I think we agree that this is just = an editorial fix.


Furthermore, the draft should be very specific on how the TCP = sender should act when cwnd=3Dssthresh and ECE arrives. Currently the = draft specifies the way how the TCP sender reduces ssthresh (and cwnd) = in Congestion Avoidance. According to RFC 5681, when cwnd =3D ssthresh, = TCP is not in Slow Start nor in Congestion Avoidance. Therefore, the = draft should be explicit on how cwnd is reduced, when cwnd=3Dssthresh.

Why? RFC 5681 states =E2=80=9CWhen = cwnd and ssthresh are equal, the sender may use either slow start or = congestion avoidance.=E2=80=9D - so if you're an implementer, this = basically tells you that you have to make a decision on your own for the = cwnd =3D=3D sthresh case. We specify how to behave when you=E2=80=99re = in congestion avoidance - thus it depends on the decision you=E2=80=99ve = taken for this case.

Yes, but RFC 5681 does not make = any difference in how to decrease cwnd in Slow Start and CA but ABE = does. RFC 5681 only discusses that it is implementors choice how to = *increase* cwnd in this case but here we discuss how to decrease cwnd = that is more crucial decision and the decision what to do maybe should = be considered more carefully as RFC 5681 does not give any = recommendation in this respect.

I have not given much thinking to this, so not = sure if it makes much difference, but discussing it is in place to judge = whether or not it matters, I think.

E.g, in an (ideal) ECN-enabled environment we = don't expect to see loss, but if it occurs due to congestion it is = possibly an indication of heavy congestion (it may also be that there = are non-ECN capable routers on the path that get congested). Now, if we = have loss and Fast Recovery repairs the loss, we set cwnd=3Dssthresh = when Fast Recovery completes. If ECE arrives immediately after Fast = Recovery, the implementor needs to decide whether to use ABE factor of = 0.8 or be more conservative. In this case we may want to be more = conservative to avoid further loss, if we think that the loss event was = due to heavy congestion. I don't know.

This is potentially also something we may want = to explore in the upcoming experimentations, so it would be worth of a = few sentences in the draft to clarify what to do in this "gray area" = (like RFC 5681 clarifies the "gray area=E2=80=9D).

OK, I = agree

Cheers,
Michael


It is true that there is (at least) one (widely deployed) = incorrect implementation of RFC 3168 that incorrectly sets lower bound = of 2 MSS for cwnd when congestion is ECN-signaled. This, however, must = not be used as any kind of justification for chang=C3=ADng = IETF-specified congestion control principles and requirements. Instead, = this draft should carefully instruct implementors and those who intend = to experiment with the ECN modification set in this draft to ensure the = TCP stack used for experiments correctly implements RFC 3168 in this = respect. Otherwise, such experimental results are mostly void.

Maybe the person behind this = implementation was as confused by the RFC 3168 as I am =E2=80=A6 clearly = we didn=E2=80=99t intend to change the principles.

Quite likely so. Unharmonized RFC 3168 = and RFC 2581 (and later RFC 5681) do not help in this.
Cheers,

/Markku

In addition, there is an incorrect statement in Sec 4.1:

According to
[RFC5681], when a = TCP sender detects segment loss using the
retransmission = timer and the given segment has not yet been resent by
way = of the retransmission timer, the value of ssthresh must be set to
no more of the maximum of half of the FlightSize and 2*SMSS. =  The
same equation is also used during Fast = Retransmit/Fast Recovery
[RFC5681].  As a result, the = TCP congestion control only allows one
BDP of packets in = flight.  This is just sufficient to maintain 100%
utilisation of the bottleneck on the network path.


What the text says about = setting ssthresh is correct. However, if the segment loss is detected = using the retransmission timer, the TCP
congestion control = does not allow one BDP of packets in flight (unless BDP=3D1 MSS). = Instead, cwnd is set to 1 MSS, allowing only 1 pkt in flight.

I suggest removing the text that discusses = detecting segment loss using the retransmission timer.

Good catch, thanks!

Cheers,
Michael

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(CET) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 723C3B0DD62; Sat, 17 Mar 2018 21:26:23 +0100 (CET) Date: Sat, 17 Mar 2018 21:26:23 +0100 From: Toerless Eckert To: "Eggert, Lars" Cc: "Scharf, Michael (Nokia - DE/Stuttgart)" , Thomas Nadeau , "tcpm@ietf.org" , Yingzhen Qu Message-ID: <20180317202623.GB26661@faui40p.informatik.uni-erlangen.de> References: <20180316040208.GA9492@faui40p.informatik.uni-erlangen.de> <20180316162338.GD18047@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: Re: [tcpm] [tsvwg] draft-han-tsvwg-cc X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2018 20:26:29 -0000 Thanks, Lars Maybe please read my reply to Michael where i was trying to explain that this is not intended for Internet/BE, but for PHBs where admsision control and upspeeding are feasible - and support TCP there. Cheers Toerless On Sat, Mar 17, 2018 at 07:20:17AM +0000, Eggert, Lars wrote: > Hi, > > I tried to write up a detailed reply, but I stopped myself. Here is the meta-argument: > > Essentially, there seems to be an underlying desire here - for whatever reason - to change the Internet to an architecture that has admission control, and discuss how transport protocols should change in response to that. > > I don't think such an change to the Internet will happen anytime soon. I hence don't think that spending any time on discussing CC for such an unlikely future is a very productive use of our time in the IETF. > > Lars From nobody Sat Mar 17 13:48:04 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8F08512D7F2 for ; Sat, 17 Mar 2018 13:48:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.92 X-Spam-Level: X-Spam-Status: No, score=-1.92 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=nokia.onmicrosoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KnYX1lRUh-Oc for ; 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Sat, 17 Mar 2018 20:47:57 +0000 From: "Scharf, Michael (Nokia - DE/Stuttgart)" To: Toerless Eckert , "Eggert, Lars" CC: Thomas Nadeau , "tcpm@ietf.org" , Yingzhen Qu Thread-Topic: [tcpm] [tsvwg] draft-han-tsvwg-cc Thread-Index: AQHTvNuRsY1NVnC/X06wq/ofyfzol6PSzbEQgAA+4ICAAPqEgIAA26KAgAAEGBA= Date: Sat, 17 Mar 2018 20:47:56 +0000 Message-ID: References: <20180316040208.GA9492@faui40p.informatik.uni-erlangen.de> <20180316162338.GD18047@faui40p.informatik.uni-erlangen.de> <20180317202623.GB26661@faui40p.informatik.uni-erlangen.de> In-Reply-To: <20180317202623.GB26661@faui40p.informatik.uni-erlangen.de> Accept-Language: en-US, de-DE Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [92.203.232.179] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; AM5PR0701MB2739; 7:Skw21C+Z+AtwJURYdhxIU3+QqDEGYVVZRQC0H5QmbqTCx/BYheulAJ3XE6cyPqm1FMSKgeT+x8caiBgB8gFTU0N1/6rCXt7PHCEjNx3/8YzCKGq3vYZg9ns3q5xb39WYTNQ3M/FVDwMfrsKfHziSif0/cQqsUPRbxvfoV+4OAO0+ut2CDP+uSu696ZtSGehEeqRJV/s1K5i7O6LmgB5iEnMmcQarxUASyNBKpENAqwC3fHW/8dVhqI04mOj0vinR x-ms-exchange-antispam-srfa-diagnostics: SOS; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 83ae5bdb-52be-4016-69cd-08d58c485d1c X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Mar 2018 20:47:56.9419 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0701MB2739 Archived-At: Subject: Re: [tcpm] [tsvwg] draft-han-tsvwg-cc X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2018 20:48:03 -0000 Resource guarantees and admission control will in many cases also be needed= below IP, e.g., if there are shared resources (e.g., Ethernet switches or = Wifi meshes). If there are shared resources below IP, resource reservation = at IP layer will not be sufficient for this proposed congestion control. So, the assumptions on the network architecture and its functionality are n= ot limited to the IP layer only. This needs to be made explicit in the docu= ment. Michael > -----Original Message----- > From: Toerless Eckert [mailto:tte@cs.fau.de] > Sent: Saturday, March 17, 2018 9:26 PM > To: Eggert, Lars > Cc: Scharf, Michael (Nokia - DE/Stuttgart) ; > Thomas Nadeau ; tcpm@ietf.org; Yingzhen Qu > > Subject: Re: [tcpm] [tsvwg] draft-han-tsvwg-cc >=20 > Thanks, Lars >=20 > Maybe please read my reply to Michael where i was trying to explain that = this > is not intended for Internet/BE, but for PHBs where admsision control and > upspeeding are feasible - and support TCP there. >=20 > Cheers > Toerless >=20 > On Sat, Mar 17, 2018 at 07:20:17AM +0000, Eggert, Lars wrote: > > Hi, > > > > I tried to write up a detailed reply, but I stopped myself. Here is the= meta- > argument: > > > > Essentially, there seems to be an underlying desire here - for whatever > reason - to change the Internet to an architecture that has admission con= trol, > and discuss how transport protocols should change in response to that. > > > > I don't think such an change to the Internet will happen anytime soon. = I > hence don't think that spending any time on discussing CC for such an > unlikely future is a very productive use of our time in the IETF. > > > > Lars From nobody Sat Mar 17 15:02:53 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D4EFA126B72 for ; Sat, 17 Mar 2018 15:02:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.96 X-Spam-Level: X-Spam-Status: No, score=-3.96 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nbaskOXgKahn for ; Sat, 17 Mar 2018 15:02:48 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2D7F81241F8 for ; Sat, 17 Mar 2018 15:02:48 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [131.188.34.77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id D0FBF58C4F7; Sat, 17 Mar 2018 23:02:43 +0100 (CET) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id B6E2EB0DD66; Sat, 17 Mar 2018 23:02:43 +0100 (CET) Date: Sat, 17 Mar 2018 23:02:43 +0100 From: Toerless Eckert To: "Scharf, Michael (Nokia - DE/Stuttgart)" Cc: "Eggert, Lars" , Thomas Nadeau , "tcpm@ietf.org" , Yingzhen Qu Message-ID: <20180317220243.GC26661@faui40p.informatik.uni-erlangen.de> References: <20180316040208.GA9492@faui40p.informatik.uni-erlangen.de> <20180316162338.GD18047@faui40p.informatik.uni-erlangen.de> <20180317202623.GB26661@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: Re: [tcpm] [tsvwg] draft-han-tsvwg-cc X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2018 22:02:51 -0000 Thanks, Michael There are a lot of Standards track RFC about L3 PHB in conjunction with admission control/CAC and i can't remember a single one that discusses underlying L2 CAC unless it defines how to map to such L2 mechanisms or defines them. But not any RFC simply expecting admission control mechanisms to define higher layer behavior. [ RFC5865 is maybe an interesting example to see how expectations against capacity admission are described in a standards track RFC that is arguing to modify / expand PHB And this is already going farther in outlining options than i've seen in othre RFCs. Note that there is also no notion of "controlled networks" or the like to constrain applicability, because that AFAIK is really only done in docs targeting Internet/EF. ] I am not saying this to dismiss your point (quite the opposite), but rather in fear of past experiences where such explanatory text was seen as unnecessary/gratuitous given how the particular drafts text was meant to be orthogonal to whatever underlying option was used to provide dependencies. Maybe one way to look at this is that there may be a community in the IETF well aware of DiffServ/QoS/CAC, but its not the TCP community, so more informational text about feasible alternatives and expectations to deploy this type of "hybrid CAC + CC" for TCP flow would be helpful for acceptance by the TCP community ?! If so, then maybe it would be better to provide such framework information in a draft separately from one specifically targeted for an individual CC algorithm such as Reno or any of the other popular ones. What do you think ? Cheers Toerless On Sat, Mar 17, 2018 at 08:47:56PM +0000, Scharf, Michael (Nokia - DE/Stuttgart) wrote: > Resource guarantees and admission control will in many cases also be needed below IP, e.g., if there are shared resources (e.g., Ethernet switches or Wifi meshes). If there are shared resources below IP, resource reservation at IP layer will not be sufficient for this proposed congestion control. > > So, the assumptions on the network architecture and its functionality are not limited to the IP layer only. This needs to be made explicit in the document. > > Michael > > > > -----Original Message----- > > From: Toerless Eckert [mailto:tte@cs.fau.de] > > Sent: Saturday, March 17, 2018 9:26 PM > > To: Eggert, Lars > > Cc: Scharf, Michael (Nokia - DE/Stuttgart) ; > > Thomas Nadeau ; tcpm@ietf.org; Yingzhen Qu > > > > Subject: Re: [tcpm] [tsvwg] draft-han-tsvwg-cc > > > > Thanks, Lars > > > > Maybe please read my reply to Michael where i was trying to explain that this > > is not intended for Internet/BE, but for PHBs where admsision control and > > upspeeding are feasible - and support TCP there. > > > > Cheers > > Toerless > > > > On Sat, Mar 17, 2018 at 07:20:17AM +0000, Eggert, Lars wrote: > > > Hi, > > > > > > I tried to write up a detailed reply, but I stopped myself. Here is the meta- > > argument: > > > > > > Essentially, there seems to be an underlying desire here - for whatever > > reason - to change the Internet to an architecture that has admission control, > > and discuss how transport protocols should change in response to that. > > > > > > I don't think such an change to the Internet will happen anytime soon. I > > hence don't think that spending any time on discussing CC for such an > > unlikely future is a very productive use of our time in the IETF. > > > > > > Lars > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm -- --- tte@cs.fau.de From nobody Sat Mar 17 15:54:36 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2745B12426E for ; Sat, 17 Mar 2018 15:54:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=nokia.onmicrosoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9y28McdIGoMG for ; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0d4ceb0c-0913-4257-32a7-08d58c5a07d2 X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Mar 2018 22:54:24.8013 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0701MB2564 Archived-At: Subject: Re: [tcpm] [tsvwg] draft-han-tsvwg-cc X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2018 22:54:34 -0000 > I am not saying this to dismiss your point (quite the opposite), but rath= er in > fear of past experiences where such explanatory text was seen as > unnecessary/gratuitous given how the particular drafts text was meant to = be > orthogonal to whatever underlying option was used to provide > dependencies. This draft is about congestion control. This document makes assumptions abo= ut a network and will only work if these assumptions are met, but not other= wise. So, in my view, _all_ assumptions on the network must be spelt out. S= ome issues will be non-trivial to explain (and to solve). Shared media belo= w IP is one of the issues to be explicitly discussed in a section on the ap= plicability of the document, as this probably implies that some signaling/O= AM at IP layer may have to interact with some signaling/OAM in the sub-IP l= ayer. It does not matter how this is implemented. But I expect that a docum= ent will *comprehensively* explain all potential issues in shared media, wi= reless networks, etc. For instance, I believe guidance will be needed for t= he administrator of the network domain that enables such an algorithm, rega= rding *what* has to be ensured in that network. The *how* does not have to = be discussed as part of a congestion control specification. > Maybe one way to look at this is that there may be a community in the IET= F > well aware of DiffServ/QoS/CAC, but its not the TCP community, so more > informational text about feasible alternatives and expectations to deploy= this > type of "hybrid CAC + CC" for TCP flow would be helpful for acceptance by > the TCP community ?! The document has to be explicit about the assumptions and this will require= text on how TCP connections would be treated in the network, taking into a= ccount well-known characteristics of shared media, wireless networks, and t= he like. There may be multiple ways to implement resource guarantees, and t= hey may be implemented differently in different network technologies. But i= t must be spelt out explicitly how a TCP connection using this algorithm wo= uld be treated in all possible deployments and all possible network paths u= sed by a TCP connection using this algorithm. =20 > If so, then maybe it would be better to provide such framework informatio= n > in a draft separately from one specifically targeted for an individual CC > algorithm such as Reno or any of the other popular ones. What do you thin= k ? I don't understand how a framework document would look like but I could per= fectly imagine that it would cover also aspects relevant to RTG, INT, OPS, = and ART, and last but not least IRTF. The latter may be good place to start= such work. Michael From nobody Sat Mar 17 16:07:39 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1CDBC12D872 for ; Sat, 17 Mar 2018 16:07:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.23 X-Spam-Level: X-Spam-Status: No, score=-4.23 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nmg-Wtr3Ovqj for ; Sat, 17 Mar 2018 16:07:36 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B4E8E12426E for ; Sat, 17 Mar 2018 16:07:36 -0700 (PDT) Received: from lhreml706-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id D54952CB7F8E7; Sat, 17 Mar 2018 23:07:32 +0000 (GMT) Received: from SJCEML701-CHM.china.huawei.com (10.208.112.40) by lhreml706-cah.china.huawei.com (10.201.108.47) with Microsoft SMTP Server (TLS) id 14.3.382.0; Sat, 17 Mar 2018 23:07:34 +0000 Received: from SJCEML521-MBS.china.huawei.com ([169.254.2.168]) by SJCEML701-CHM.china.huawei.com ([169.254.3.93]) with mapi id 14.03.0382.000; Sat, 17 Mar 2018 16:07:19 -0700 From: Yingzhen Qu To: "Scharf, Michael (Nokia - DE/Stuttgart)" , Toerless Eckert CC: "Eggert, Lars" , Thomas Nadeau , "tcpm@ietf.org" , Lin Han Thread-Topic: [tcpm] [tsvwg] draft-han-tsvwg-cc Thread-Index: AQHTvNvC50kcphaiskyvoRPYdX2H0KPTVYcAgAAsYoCAAPqEgIAA26KAgAAGBgCAABTlgIAADnAAgAADl4A= Date: Sat, 17 Mar 2018 23:07:19 +0000 Message-ID: References: <20180316040208.GA9492@faui40p.informatik.uni-erlangen.de> <20180316162338.GD18047@faui40p.informatik.uni-erlangen.de> <20180317202623.GB26661@faui40p.informatik.uni-erlangen.de> <20180317220243.GC26661@faui40p.informatik.uni-erlangen.de> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.94.217] Content-Type: text/plain; charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [tcpm] [tsvwg] draft-han-tsvwg-cc X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2018 23:07:38 -0000 SGkgTWljaGFlbCwNCg0KSSB0b3RhbGx5IGFncmVlIHdpdGggeW91IHRoYXQgdGhlIHByb3Bvc2Vk IGFsZ29yaXRobSBkb2VzIGhhdmUgYW4gYXNzdW1wdGlvbiB0aGF0IGJhbmR3aWR0aCBpcyByZXNl 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mapi id 14.03.0382.000; Sat, 17 Mar 2018 16:40:14 -0700 From: Lin Han To: "Scharf, Michael (Nokia - DE/Stuttgart)" CC: "tcpm@ietf.org" , "tsvwg-chairs@ietf.org" , "'iccrg@irtf.org'" , Thomas Nadeau , Yingzhen Qu Thread-Topic: Questions on draft-han-tsvwg-cc-00 Thread-Index: AdO8pkvfd4lsbPnoT7CbLbNzdShcRwBnm4KAAAy5PwAADe51sA== Date: Sat, 17 Mar 2018 23:40:13 +0000 Message-ID: <1D30AF33624CDD4A99E8C395069A2A162CDBC402@sjceml521-mbs.china.huawei.com> References: <27982D64-95F7-48DB-AADE-F8D3015CF790@huawei.com> In-Reply-To: <27982D64-95F7-48DB-AADE-F8D3015CF790@huawei.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.85.194] Content-Type: multipart/alternative; boundary="_000_1D30AF33624CDD4A99E8C395069A2A162CDBC402sjceml521mbschi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [tcpm] FW: Questions on draft-han-tsvwg-cc-00 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2018 23:40:30 -0000 --_000_1D30AF33624CDD4A99E8C395069A2A162CDBC402sjceml521mbschi_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 IEhpLCBTY2hhcmYNCg0KRm9yIHNvbWUgcmVhc29uLCBJIGRpZCAgbm90IHJlY2VpdmUgdGhpcyB0 aHJlYWQsIG1heWJlIG15IGZpbHRlciBzZXQgaGFzIHByb2JsZW0uDQoNClNlZSBiZWxvdyBmb3Ig bW9yZSBjbGFyaWZpY2F0aW9uIHdpdGggW0xIXQ0KDQpSZWdhcmRzDQoNCkxpbg0KDQpGcm9tOiAi U2NoYXJmLCBNaWNoYWVsIChOb2tpYSAtIERFL1N0dXR0Z2FydCkiIDxtaWNoYWVsLnNjaGFyZkBu b2tpYS5jb208bWFpbHRvOm1pY2hhZWwuc2NoYXJmQG5va2lhLmNvbT4+DQpEYXRlOiBUaHVyc2Rh eSwgTWFyY2ggMTUsIDIwMTggYXQgNDoxNyBQTQ0KVG86ICJkcmFmdC1oYW4tdHN2d2ctY2NAaWV0 Zi5vcmc8bWFpbHRvOmRyYWZ0LWhhbi10c3Z3Zy1jY0BpZXRmLm9yZz4iIDxkcmFmdC1oYW4tdHN2 d2ctY2NAaWV0Zi5vcmc8bWFpbHRvOmRyYWZ0LWhhbi10c3Z3Zy1jY0BpZXRmLm9yZz4+DQpDYzog 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<1D30AF33624CDD4A99E8C395069A2A162CDBC911@sjceml521-mbs.china.huawei.com> References: <27982D64-95F7-48DB-AADE-F8D3015CF790@huawei.com> <1D30AF33624CDD4A99E8C395069A2A162CDBC402@sjceml521-mbs.china.huawei.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.47.86.34] Content-Type: multipart/related; boundary="_012_1D30AF33624CDD4A99E8C395069A2A162CDBC911sjceml521mbschi_"; type="multipart/alternative" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: X-Mailman-Approved-At: Sun, 18 Mar 2018 08:27:44 -0700 Subject: Re: [tcpm] Questions on draft-han-tsvwg-cc-00 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 18 Mar 2018 11:09:13 -0000 --_012_1D30AF33624CDD4A99E8C395069A2A162CDBC911sjceml521mbschi_ Content-Type: 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([169.254.2.168]) by SJCEML701-CHM.china.huawei.com ([169.254.3.93]) with mapi id 14.03.0382.000; Sun, 18 Mar 2018 05:58:51 -0700 From: Lin Han To: Tom Herbert CC: "Scharf, Michael (Nokia - DE/Stuttgart)" , Toerless Eckert , Gorry Fairhurst , Thomas Nadeau , "tcpm@ietf.org" , "tsvwg@ietf.org" , "tsvwg-chairs@ietf.org" , Katsushi Kobayashi , Yingzhen Qu Thread-Topic: [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) Thread-Index: AQHTvL6dNgq1fgunpk6VuHbKAe8Xt6PSB2hwgAB6pgD//5KtwIAAvJUAgAMbRyA= Date: Sun, 18 Mar 2018 12:58:50 +0000 Message-ID: <1D30AF33624CDD4A99E8C395069A2A162CDBCF65@sjceml521-mbs.china.huawei.com> References: <5A9BEB65.6010102@erg.abdn.ac.uk> <050065D2-5F2E-4E79-9BD1-E1DC03F13900@acm.org> <5AA79C2E.1040808@erg.abdn.ac.uk> <20180313164928.GA17042@faui40p.informatik.uni-erlangen.de> <1D30AF33624CDD4A99E8C395069A2A162CDBBA47@sjceml521-mbs.china.huawei.com> <1D30AF33624CDD4A99E8C395069A2A162CDBBA8E@sjceml521-mbs.china.huawei.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.47.86.34] Content-Type: multipart/related; boundary="_004_1D30AF33624CDD4A99E8C395069A2A162CDBCF65sjceml521mbschi_"; type="multipart/alternative" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: X-Mailman-Approved-At: Sun, 18 Mar 2018 08:27:44 -0700 Subject: Re: [tcpm] [tsvwg] inband signaling (was: Re: Agenda requests for TSVWG@IETF101) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 18 Mar 2018 12:59:11 -0000 --_004_1D30AF33624CDD4A99E8C395069A2A162CDBCF65sjceml521mbschi_ Content-Type: multipart/alternative; boundary="_000_1D30AF33624CDD4A99E8C395069A2A162CDBCF65sjceml521mbschi_" --_000_1D30AF33624CDD4A99E8C395069A2A162CDBCF65sjceml521mbschi_ Content-Type: text/plain; charset="utf-8" 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v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=ZcY45+l7ziPXzaU066v5K3VTxlb0GPSX7PF0UJsPQck=; b=j0jh05JtS+Dk5UVwnPM0u4j3HSt5pjXpPQx4U2c/vFt/lMxijih9zJuJiJGDpvJMdG +yCJwYwitjFVMjm+eXLgu88s+nFkhM93i7LLlUrocit0494SrOPOMAyQOTYAfSx1o6r0 rle+pUZY9GPzCuScAfGHClyfRmjAU4dQ5ZBeF0ApPOgIIH7D3+VmHJOTskZvxxRiWs5F Sbvb3PyQrlmxEORkh69SMo/QN92T1AYM7LlM+08m7GgvSLMaOohOHOjbbZXM/IfZvbjq DcJ5GKriLGMRX4ZfQaXhM8NEqlq5HuWY+70Ubl1W+t5zbzrKmXl/U7YpvpuU/4eE6t1s 85rA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=ZcY45+l7ziPXzaU066v5K3VTxlb0GPSX7PF0UJsPQck=; b=bJsiQHEsE/9moBAwszs2A3Jasu8v2nsI+jc7AHadHO3VXmwcjcumR+0SPJl9Ny6Wnm Fs+WI/GOW5eexibt3HupmJXrCBcdth2oWoQovTFZeC1Q5QxaKVKVX34zsqYuel2jXehD 72fdtTF+1KatM2yFTd6BeEN9sKtZti8EX2d27IJdWTANo3zvzU1NG6PqljhmGOlyOQcn 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Yingzhen Qu , "tsvwg-chairs@ietf.org" , "iccrg@irtf.org" Content-Type: multipart/related; boundary="089e0821fc0cda00980567b88758" Archived-At: X-Mailman-Approved-At: Sun, 18 Mar 2018 16:59:50 -0700 Subject: Re: [tcpm] [iccrg] Questions on draft-han-tsvwg-cc-00 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 18 Mar 2018 23:52:22 -0000 --089e0821fc0cda00980567b88758 Content-Type: multipart/alternative; boundary="089e0821fc0cda00960567b88757" --089e0821fc0cda00960567b88757 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi, Michael, Just for my information, I know http://citeseerx.ist.psu.edu/viewdoc/download?doi=3D10.1.1.71.4007&rep=3Dre= p1&type=3Dpdf is dated (it appeared in 1999), but since you folks are having a conversation that is constantly looking back at least a decade, is that still a useful reference for someone who is thinking about proposing changes to TCP? Or is there a more modern description that I could be looking at? Thanks for the feedback you've provided thus far. Spencer On Sun, Mar 18, 2018 at 11:38 PM, Scharf, Michael (Nokia - DE/Stuttgart) < michael.scharf@nokia.com> wrote: > Thanks a lot for confirming that in draft-han-6man-in-band-signaling-for-= transport-qos > =E2=80=9Cmore study and research need to be done=E2=80=9D for applying th= e mechanism e.g. > to Ethernet, which seems to me a pretty common technology to transport TC= P > connections. So there seem to be pretty fundamental gaps that need > research. Research can e.g. be published at conferences or in journals. > > > > Furthermore, it is obvious that a rate policer could be applied in the > host in addition to the proposed algorithm. But I still believe that the > proposed algorithm itself will result in data rates larger than PIR in th= e > scenarios I have explained (drops of the RTT), i.e., it does not meet the > objective that =E2=80=9Ca TCP sender is never allowed to send data at a r= ate > larger than PIR=E2=80=9D. Depending on how it is implemented, an addition= al rate > policer for PIR may drop packets already locally inside the host, because > the congestion control algorithm plays out too many packets. That would b= e > very ineffective. If your objective is a congestion control algorithm tha= t > at most results in a rate of PIR, your algorithm needs to change, IMHO. > > > > Also, I have said before that I believe TCP Reno can outperform your > algorithm for the same path with CIR/PIR. If you don=E2=80=99t believe it= , I > suggest to look at the transfer times of medium sized transfers with a CI= R > << PIR over an larger RTT, and compare the performance of TCP Reno with > your algorithm. IMHO you will find quite a number of cases in which TCP > Reno will complete such a data transfers significantly faster than the > algorithm in draft-han-tsvwg-cc-00. I have already explained the root cau= se > earlier. This effect should occur even if there is no PIR capping. It mea= ns > that a user could still request the guaranteed resources, but just use th= e > existing TCP congestion control with it, and he will get better throughpu= t > and/or response times over the resources that were requested. In that cas= e, > what benefit would a user have from using draft-han-tsvwg-cc-00? > > > > Finally, I cannot parse the figure in the e-mail below; this is useless > without labels and the like. A statement =E2=80=9CWe will have more compa= rison test > results (CC vs new CC) in the future=E2=80=9D is somewhat concerning. Bef= ore > proposing an algorithm for IETF standardization, I believe that such a > proposal must be comprehensively tested in simulations and measurements > with real TCP stacks to ensure that the algorithm is properly designed, > works as expected, and indeed has benefits over what already exists. None > of this is clear for draft-han-tsvwg-cc-00. > > > > Michael > > > > *From:* Lin Han [mailto:Lin.Han@huawei.com] > *Sent:* Sunday, March 18, 2018 12:09 PM > *To:* Scharf, Michael (Nokia - DE/Stuttgart) > *Cc:* tcpm@ietf.org; tsvwg-chairs@ietf.org; 'iccrg@irtf.org' < > iccrg@irtf.org>; Thomas Nadeau ; Yingzhen Qu < > yingzhen.qu@huawei.com> > *Subject:* RE: Questions on draft-han-tsvwg-cc-00 > > > > > > > > *From:* Scharf, Michael (Nokia - DE/Stuttgart) [ > mailto:michael.scharf@nokia.com ] > *Sent:* Sunday, March 18, 2018 12:09 AM > *To:* Lin Han > *Cc:* tcpm@ietf.org; tsvwg-chairs@ietf.org; 'iccrg@irtf.org' < > iccrg@irtf.org>; Thomas Nadeau ; Yingzhen Qu < > yingzhen.qu@huawei.com> > *Subject:* RE: Questions on draft-han-tsvwg-cc-00 > > > > Some follow-up remarks inline [ms] > > > > Michael > > > > *From:* Lin Han [mailto:Lin.Han@huawei.com ] > *Sent:* Sunday, March 18, 2018 12:40 AM > *To:* Scharf, Michael (Nokia - DE/Stuttgart) > *Cc:* tcpm@ietf.org; tsvwg-chairs@ietf.org; 'iccrg@irtf.org' < > iccrg@irtf.org>; Thomas Nadeau ; Yingzhen Qu < > yingzhen.qu@huawei.com> > *Subject:* FW: Questions on draft-han-tsvwg-cc-00 > > > > Hi, Scharf > > > > For some reason, I did not receive this thread, maybe my filter set has > problem. > > > > See below for more clarification with [LH] > > > > Regards > > > > Lin > > > > *From: *"Scharf, Michael (Nokia - DE/Stuttgart)" > > *Date: *Thursday, March 15, 2018 at 4:17 PM > *To: *"draft-han-tsvwg-cc@ietf.org" > *Cc: *"tcpm@ietf.org" , "tsvwg@ietf.org" , > "iccrg@irtf.org" > *Subject: *Questions on draft-han-tsvwg-cc-00 > *Resent-From: * > *Resent-To: *, > *Resent-Date: *Thursday, March 15, 2018 at 4:17 PM > > > > Authors, all, > > > > I have read draft-han-tsvwg-cc-00. Below I have listed a number of > questions, which I believe would have to be addressed when discussing suc= h > a mechanism in the IETF or IRTF. > > > > This e-mail is strictly limited to the content of draft-han-tsvwg-cc-00. > As the draft does not specify how the CIR and PIR will actually be > guaranteed in the Internet, as well as how OAM signaling will work at > Internet scale, I will not comment here on these assumptions, except > regarding requirements that strictly follow from the content of the I-D. > The technical, economical, and regulation aspects of the assumptions are > not in scope of TCPM and they need to be discussed and solved elsewhere. > > > > Questions on draft-han-tsvwg-cc-00: > > > > 1/ The document seems to implicitly assume that network resources are > reserved for **every** single TCP connection, right? > > > > - If that assumption is correct, it has to be spelt out explicitly in > the text and it has to be noted that the underlying technology has to > provide these capabilities **for every single** TCP connection. > - Otherwise sentences like =E2=80=9Cafter a TCP session is successfull= y > initiated its congestion window (cwnd) jumps to CIR=E2=80=9D would not= make > sense as multiple TCP connections within an traffic aggregate policied= by > CIR/PIR could start to all send with CIR in parallel, which would trig= ger > massive congestion. > - As an example, in my reading draft-han-6man-in-band-signaling-for-tr= ansport-qos-00 > would allow also reservations e.g. for aggregates of multiple TCP > connections. Such an operation mode seems not be compatible with the > suggested mechanism in this I-D, as far as I understand. So the > requirements have to be made explicit. > - Also, sentences such as =E2=80=9Cit is assumed that in bandwidth gua= ranteed > networks there have been network resources (bandwidths, queues etc.) > dedicated to the TCP flows=E2=80=9D have to be corrected to specify th= at for > the mechanism in this draft to work correctly, the resources have to b= e > guaranteed to every single TCP connection, not multiple =E2=80=9Cflows= =E2=80=9D. > > [YQ]: no, it doesn=E2=80=99t assume that network resources are reserved f= or EVERY > single TCP connection. It assumes when a TCP connection uses this propose= d > congestion control, network resources need to be reserved. The TCP exampl= e > used in draft-han-6man-in-band-signaling-for-transport-qos-00 is per-flow > based, and the congestion control draft also assumes the resources are > reserved per-flow. We will add this clarification in the next version of > the draft. > > > > [LH] The draft-han-tsvwg-cc-00 is about the CC algorithm for =E2=80=9CNEW= TCP=E2=80=9D > setup by draft-han-6man-in-band-signaling-for-transport-qos (I call it as > =E2=80=9Cin-band signaling method=E2=80=9D below) or any other method tha= t can provide a > CIR/PIR QoS service for the =E2=80=9CNEW TCP=E2=80=9D. > > As we said in in-band signaling method, the new in-band signaling method > is not supposed to be used for applications that normal TCP (reno, cubic, > etc) can satisfy the throughput requirement. This is because the new meth= od > is more costly than normal TCP and involve network devices. Off course, S= P > may charge it, but this is business issue. > > In the =E2=80=9Cin-band signaling method=E2=80=9D, we do talk about three= level of > granularity for the signaling, but only the =E2=80=9CFlow level in-band s= ignaling=E2=80=9D > is discussed in details. So, for this new CC draft, we can say each =E2= =80=9CNEW > TCP=E2=80=9D session or flow will have a PIR/CIR. > > Having said above, we can come up some summary as follows: > > 1. In a real deployment, We will use the in-band signaling method to > setup =E2=80=9CNEW TCP=E2=80=9D, and each =E2=80=9CNEW TCP=E2=80=9D wi= ll have PIR/CIR associated, and the > CIR is guaranteed end-to-end for the session. For all these =E2=80=9CN= EW TCP=E2=80=9D > sessions, we suggest to use the CC method described in > draft-han-tsvwg-cc-00, since old CC is not very adaptive to the traffi= c > behavior and network significance for =E2=80=9CNEW TCP=E2=80=9D; i.e, = the minimum rate is > guaranteed in network level to pass without any congestion; the given > maximum rate PIR cannot be exceeded, etc. > 2. In the same network, there certainly have much more regular TCP > sessions. For those TCP, they still use the old CC algorithm. > 3. The bandwidth resource is shared between =E2=80=9CNEW TCP=E2=80=9D = sessions and old > TCP sessions in a simple way > > > 1. The total reserved bandwidth for all =E2=80=9CNEW TCP=E2=80=9D sess= ions is > sum(CIR), > 2. The reserved bandwidth sum(CIR) still can be used for old TCP if > the total =E2=80=9CNEW TCP=E2=80=9D real bandwidth usage is less th= an sum(CIR). > 3. If total =E2=80=9CNEW TCP=E2=80=9D real bandwidth usage is equal= or less than > sum(CIR), =E2=80=9CNEW TCP=E2=80=9D will always grab the required b= andwidth from the link > un-used bandwidth and/or the bandwidth old TCP sessions are using. > 4. If total =E2=80=9CNEW TCP=E2=80=9D real bandwidth usage is great= than sum(CIR), > how much =E2=80=9CNEW TCP=E2=80=9D can use are dependent on the rem= ained bandwidth for the > link. > > > > [ms] As far as I can see, draft-han-6man-in-band-signaling-for-transport-= qos > ONLY is not sufficient to guarantee the assumptions of this algorithm. IP > packets using this congestion control mechanism could be dropped due to > congestion at devices that are not routers and do not process the IP or T= CP > header (e.g., a simple unmanaged Ethernet switch). So, the draft must > explicitly mention that an IP signaling mechanism such as > draft-han-6man-in-band-signaling-for-transport-qos is absolutely not > sufficient for enabling this TCP congestion control. Depending on the > technology below IP used for different IP hops further mechanisms must be > used. It could also make sense to exclude in deployment section these > sub-IP techniques for which there is currently no known technique to meet > the requirements of deploying the algorithm. Such a list of technologies > would probably be useful to network administrators as they have to ensure > that the network using this algorithm does not include any link with such= a > technology. > > > > [LH] What you said is correct, the =E2=80=9Cdraft-han-6man-in-band-signal= ing-for-transport-qos=E2=80=9D > only provides a method for IP network to support QoS for upper layer like > TCP, but it does not help if IP network is tunneling through a non-IP > network, like MPLS or Ethernet switch. This is a topic needs further stud= y > and mentioned in the section 5.4 =E2=80=9CHeterogeneous network=E2=80=9D = in the > =E2=80=9Cdraft-han-6man-in-band-signaling-for-transport-qos=E2=80=9D. > > > > > > 2/ Why does the document not rely on ECN (and not even reference ECN)? > > > > - For instance, the following requirement =E2=80=9CIt is important tha= t OAM > needs to be able to detect if any device's buffer depth has exceeded = the > pre-configured threshold, as this is an indication of potential conges= tion > and packet drop=E2=80=9D could possibly be solved by ECN, no? > - Even in case another OAM mechanism could be used in addition, a > comprehensive TCP congestion control specification would have to also = cover > the reaction to ECN marks as well, as well as the potential combinatio= n of > feedback results. Why is this missing? > - Or would the document mandates that ECN MUST NOT be enabled for TCP > connections using this congestion control mechanism? > > [YQ]: This is a good point. We haven=E2=80=99t thought about combining OA= M and ECN > together. Will need to do some research and figure it out. > > > > [LH] We just don=E2=80=99t want to mess up with the current ECN usage; i.= e, in a > same device, =E2=80=9CNEW TCP=E2=80=9D can coexist with all current TCP v= ariations, and new > CC does not impact them. > > > > [ms] The =E2=80=9Cco-existience=E2=80=9D would have to be specified, incl= uding the > reaction to ECN marks. > > > > [LH] we will specify this, and we don=E2=80=99t want to interfere with EC= N mark > and its algorithm > > > > 3/ Why does the document assume that congestion windows are calculated in > segments and not in bytes? > > > > - RFC 5681 as well as many other RFCs calculate CWND in bytes. > - However, I believe equations such =E2=80=9CMinBandwidthWND =3D CIR *= RTT/MSS=E2=80=9D > or =E2=80=9CMaxBandwidthWND =3D PIR * RTT/MSS=E2=80=9D would return a = window counted in > MSS segments. > - Apart from the mismatch with the TCP standards, this sort of > equation might also requires a discussion on how to deal with integer > division. > > [YQ]: you=E2=80=99re right, indeed in this draft the congestion windows a= re > calculated in segments. We=E2=80=99ll some calculations also in bytes, or= how to > make the conversion. > > > > > > 4/ How does the mechanism deal with IP and TCP header overhead? > > > > - TCP window sizes are about the TCP bytestream, while the actual IP > packets sent by a TCP/IP stack will include an IP and TCP header. If o= ne > neglects the IP and TCP headers in the congestion window calculation, = the > resulting IP packet rate will be larger than the CIR and PIR seen in t= he > TCP layer. This could result in packet drops if CIR and PIR are enforc= ed > e.g. for IP packet length. > - How will this problem be solved? Note that TCP (and also IP) can > include header options, which results in variable header sizes. The nu= mber > of TCP options can be different for each TCP segment. How does this > congestion control mechanism correctly handle the headers and the opti= ons > in IP and TCP headers? > > [YQ]: good point. The more accurate way is: the size of real packets that > got transmitted on the wire should be used to calculate how many packets > can be transmitted using the bandwidth reserved. We=E2=80=99ll add this i= n the next > version. > > > > 3/ How does the document deal with RTT variations? Is the assumption that > the RTT is constant? > > > > - As far as I can tell from experiments, the RTT estimation is > important when applying a rate to window-based congestion control, whi= ch is > what this document does. > - Equations such =E2=80=9CMinBandwidthWND =3D CIR * RTT/MSS=E2=80=9D o= r =E2=80=9CMaxBandwidthWND > =3D PIR * RTT/MSS=E2=80=9D only provide a window equivalent to the > bandwidth-delay product of the path if the RTT sample is a correct > prediction of the actual delay that the segments in flight will experi= ence. > How does the mechanism suggested in this document correctly predict th= e > future RTT of the segments that are sent by the sender at a given poin= t in > time? > - As an example, assume that the RTT at time t=3D10s is determined as > 80ms. Assume PIR =3D 10 Mbps and neglect the questions 3/ and 4/. Then= this > document would probably assume that MaxBandwidthWND=3D100 kB is the ba= ndwidth > delay product of the path during t=3D10s and t=3D10.08s, i.e., the max= imum > amount of outstanding data that can be sent in that time without drops= (or > exceeding PIR). But assume that the actual round-trip delay of segment= s has > dropped to 40ms after the last RTT management, which means that the ma= ximum > bandwidth delay product of the path at t=3D10s+epsilon is only 50 kB. = As a > result, 50 Kb out of the congestion window would likely be dropped dur= ing > t=3D10s and t=3D10.08s. And, due to the wrong RTT value, the effective= data > rate of the sender could even be 20 Mbps, if the RTT mismatch is not > detected immediately, or, e.g., if EWMA will delay the update of the > weighted RTT parameter to the actual value. > - So how does the proposed scheme to indeed determine a window that > meets the statement =E2=80=9CThis means a TCP sender is never allowed = to send > data at a rate larger than PIR=E2=80=9D if the RTT is not constant? D= oes this > assume rate pacing in the TCP sender for each TCP connection? > > [YQ]: no, RTT is not assumed to be constant in this draft. It=E2=80=99s > calculated using RTT =3D a* old RTT + (1-a) * new RTT (0 < a < 1) (1) > > > > [ms] And, as explained in my example, the statement =E2=80=9CThis means a= TCP > sender is never allowed to send data at a rate larger than PIR=E2=80=9D i= s not > met by the current design of the algorithm. I have provided an actual > example where the algorithm breaks. Please explain how the algorithm > ensures that a TCP sender never sends more than PIR over links with > variable RTT. > > > > [LH] Do not allow the rate exceeding the PIR is to regulate the traffic a= t > ingress to reduce the burst of traffic. This will effectively reduce the > buffer depth and the worst case latency. > > After per flow shaping, we will mark the color to different rate of > traffic: GREEN (ratePIR). The > GREEN traffic will always get scheduled at egress side after IP forwardin= g > process; the YELLOW traffic will be scheduled if the egress buffer depth = is > less than some pre-configured value (i.e, 70%), and will be dropped if th= e > buffer depth is exceeding the pre-configured value. > > We can easily do nothing after rate exceeding CIR, but this will make PIR > parameter meaningless. We use PIR and CIR instead of CIR only is because > this is a traditional definition from QoS point of view. We have already > simplified the definition, and removed some parameters like CB (committed > burst) and ECB (Exceeding Committed burst), etc. > > If we want to have the behavior of reno, user can easily set the PIR as a > very high value or even link bandwidth, the traffic will get to the > equilibrium point caused by congestion before reaching up its PIR. If the > community think this is more reasonable solution (don=E2=80=99t not cap t= he rate to > PIR at ingress), we can easily change the rule in hardware and CC algorit= hm > accordingly. > > > > 4/ How is it ensured that OAM alarms will reach the TCP sender in time in > all possible =E2=80=9Crandom failure=E2=80=9D cases? > > > > - As far as I understand, the following statement =E2=80=9CWhen a send= er > receives the third duplicated ACK, but no previous OAM congestion alar= m has > been received, then it is considered that a segment is lost due to ran= dom > failure not congestion. In this case the cwnd is not changed.=E2=80= =9D > mandates that an OAM alarm is received prior to the third duplicate AC= K **in > all potential cases** of congestion. If the OAM alarm got lost or > delayed, this condition would imply that cwnd is not changed despite a > segment has been dropped due to congestion, which would be a violation= of > fundamental Internet congestion control principles. > - Please expand on how this document ensures that cwnd will be reduces > in all potential cases when a packet gets dropped due to congestion, a= nd > what requirements on the OAM alarms propagation follow from that. Of > specific interest are effects such as packet drops of packets relevant= for > the OAM information, reordering of packets, asymmetric routing in forw= ard > and reverse direction, use of multiple paths in parallel (ECMP), and t= he > like. If the document makes assumption about the path such as in-order > packet delivery or the like, these assumptions need to be spelt out > explicitly. > - I understand that the OAM could be solved in different ways and the > solution is independent of this document. But this document has to > comprehensively specify all technical requirements that the OAM mechan= ism > has to meet in order to ensure that every single packet drop due to > congestion always results in a cwnd reduction. Otherwise the algorithm= has > to change as it does not safely prevent congestion. > > [YQ]: in case an OAM alarm for congestion is lost, currently cwnd is not > changed. The chance of packet loss due to congestion might be increased, = so > an OAM alarm should be received soon. But I agree more > design/considerations should be added here. > > > > [LH] if the OAM alarm msg is lost, we loss the capability to distinguish > the random failure and the congestion loss, we will treat the loss as > congestion loss. This is not worse than current reno. > > > > [ms] This is not what is written in the draft so the algorithm will need > to change. As a side note, the IETF has tried many years to find a soluti= on > of how to distinguish congestion loss and random failures. If the algorit= hm > wants to make that distinction, it has to explain how all congestion pack= et > losses will always be detected. > > > > [LH] will make it clear in the document. > > > > 5/ What is the expected performance benefit? Are there situations in whic= h > performance will be worse than standard TCP congestion control? > > > > - The document does not contain any data of potential improvements or > deteriorations as compared to the TCP standard congestion control. I a= ssume > that such data will be presented to explain why this mechanism is prop= osed, > and what benefits it has. > - As I have experimented with similar mechanisms quite a bit, I > believe there will be cases in which this congestion control mechanism= will > perform worse than a TCP sender fully compliant to RFC 5681, when usin= g the > same network path with CIR and PIR guarantees. I believe this document > should analyze these cases and reason why a worse performance than sta= ndard > TCP congestion control will be acceptable. IMHO this issue will > specifically apply in cases when PIR is significantly larger than CIR,= and > if the RTT is large. As far as I can see, this draft mandates to start= the > data transfer in congestion avoidance at CIR rate, which means that it= can > take many RTTs until the sender reaches the PIR. In contrast, RFC 5681= will > run slow-start, and RFC 5681 states that the =E2=80=9Cinitial value of= ssthresh > SHOULD be set arbitrarily high=E2=80=9D. This means that the TCP sende= r can reach > PIR within few RTTs and thus can send with full PIR speed, while a sen= der > using draft-han-tsvwg-cc-00 will send with a much lower speed CIR+epsi= lon. > For short and medium-sized data transfers, IMHO it can happen that the > congestion control according to RFC 5681 will significantly outperform= the > mechanism suggested in this document, i.e., it will complete data tran= sfers > orders of magnitude faster even without any knowledge about CIR and PI= R. > Have the authors compared this mechanism to the performance of RFC 568= 1? > - Also, have the authors compared the performance of this mechanism as > compared to a modern TCP stack, which often use RFC 6928 (IW 10) and R= FC > 8312 (CUBIC)? In what cases has the suggested congestion control a bet= ter > performance? I ask this because I have performed experiments 10 years = ago > with congestion control schemes that have some similarity to what is > suggested here, and they also used knowledge about the path properties= . In > those experiments, it turned out to be quite difficult to design an > algorithm that uses knowledge about the path (such as CIR/PIR) and tha= t > outperforms CUBIC in combination IW 10, even if such a stack is totall= y > unaware of the path. This has been discussed e.g. in ICCRG > https://www.ietf.org/proceedings/73/slides/iccrg-2.pdf > . As context, > =E2=80=9Cmore-start=E2=80=9D in this document is somewhat similar to w= hat is proposed in > this I-D (but applied to CUBIC), while the =E2=80=9Cinitial-start=E2= =80=9D graphs somehow > corresponds to what was later specified in RFC 6928 (IW 10) and RFC 83= 12 > (CUBIC). > > [YQ]: Totally agree. This is not a one to fit all solution, it has its > usage limitations. Detail comparisons and suggestion on when to use this > algorithm will be added later. > > > > [LH] Cannot be, as I said for question one, the new CC is just a > improvement over the current TCP-reno when used for =E2=80=9CNEW TCP=E2= =80=9D. It makes the > TCP-reno adapted to the new behavior of =E2=80=9CNEW TCP=E2=80=9D, the lo= gic is very > straightforward. > > > > [ms] As I shown in my example, there will be cases in which this proposed > congestion control is **not** an improvement over TCP Reno. There will be > cases in which it transfers data significantly slower than TCP Reno, and > this will affect interactive applications that need e.g. very fast respon= se > times. An application designer will observe that even TCP Reno can give > better performance over the same network. For some cases I think one can > even calculate explicitly how much slower this algorithm is as compared t= o > TCP Reno, and how much worse application performance will be =E2=80=93 th= e effect > and its root cause is so simple that one does not even need any > implementation for calculating how much worse this algorithm is than TCP > Reno. I believe that application developers would be interested in > understanding when (and why) this algorithm is slower than a > standard-compliant TCP over the same network. > > > > [LH]See the explanation for question 3. > > I guess this is the major misunderstanding point from our document, we > need to make document more clear in this regard. > > The new CC is not to compete with reno in throughput for any case since i= t > does not need to, it try to make reno more adaptive to the new traffic > behavior enforced by the QoS. The QoS itself will provide completely > different behavior with traditional TCP CC, see below (PIR=3DCIR; B1, B2 = are > new TCP set by in-band signaling and without changes of CC, n1 and n2 are > reno). > > It seems that In-band signaling method can have =E2=80=9Cbetter throughpu= t=E2=80=9D than > traditional TCP, but is it surprised? No, Off course not, QoS will be > better than best-effort! The better throughput is not caused by new CC, i= t > is caused by QoS. Directly comparing new CC with reno for throughput does > not make sense -J New CC means nothing without the per-flow QoS . > > Picture below also shows the new TCP will always provide the expected > throughput no matter how much bandwidth used by other traditional TCP. We > will have more comparison test results (CC vs new CC) in the future. > > > > [image: Rate(Kbps)][image: Rate(Kbps)][image: Time(s)][image: Time(s)] > > > > > > > > 6/ For what application traffic patterns is this mechanism proposed? > > > > - The document states in Section 3 =E2=80=9C=E2=80=A6 with the develop= ment of new > applications, such as AR/VR=E2=80=9D. What properties do such applicat= ions have to > leverage the mechanism suggested in this document? Is it possible to > characterize what the =E2=80=9Cnew=E2=80=9D requirements are, and how = the suggested > algorithm meets these requirements? > - Is it suggested to apply this congestion control to real-time media > traffic over TCP? If so, what would be the benefit of using TCP in gen= eral > and of the specific mechanism compared to congestion control algorithm= for > such traffic (e.g., the RMCAT working group)? > > [YQ] same as above answer, the exact traffic patterns that can benefit > from this algorithm will be studied in more detail and provided in later > version of the draft. > > > > [ms] I assume that =E2=80=9Clater version=E2=80=9D means =E2=80=9Cnext ve= rsion=E2=80=9D. It is pointless > to further discuss a congestion control algorithm without details about > workloads and the algorithm performance, resulting from simulations, actu= al > measurement from implementations, etc. Such data can also be published at > research conferences or in research journals prior to presenting it in th= e > IRTF or IETF. > > > > Michael > > > > > > This list of questions is not comprehensive, but I=E2=80=99ll stop here. > > > > Regarding potential next steps of this document in the TCPM working group= , > I believe that the applicable TCPM charter wording is: =E2=80=9CIn additi= on, TCPM > may document alternative TCP congestion control algorithms that are known > to be widely deployed, and that are considered safe for large-scale > deployment in the Internet.=E2=80=9D Until these prerequisites are fulfil= led in > the Internet, in my view the document cannot be adopted in TCPM. Research > could be performed in the IRTF, e.g., in ICCRG. > > > > Thanks > > > > Michael (with no hat on) > > _______________________________________________ > iccrg mailing list > iccrg@irtf.org > https://www.irtf.org/mailman/listinfo/iccrg > > --089e0821fc0cda00960567b88757 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi, Michael,

Just for my information, I= know=C2=A0http://citeseerx.ist.psu.edu/v= iewdoc/download?doi=3D10.1.1.71.4007&rep=3Drep1&type=3Dpdf is d= ated (it appeared in 1999), but since you folks are having a conversation t= hat is constantly looking back at least a decade, is that still a useful re= ference for someone who is thinking about proposing changes to TCP? Or is t= here a more modern description that I could be looking at?

Thanks fo= r the feedback you've provided thus far.

Spenc= er

On Sun, Mar= 18, 2018 at 11:38 PM, Scharf, Michael (Nokia - DE/Stuttgart) <mich= ael.scharf@nokia.com> wrote:

Thanks a lot for confirming that in draft-han-6man-i= n-band-signaling-for-transport-qos =E2=80=9Cmore study and research need to be done=E2=80=9D for applying the mechanism e.= g. to Ethernet, which seems to me a pretty common technology to transport TCP connections. So there seem to be pretty fundamental gaps that need res= earch. Research can e.g. be published at conferences or in journals.=

=C2=A0

Furthermore, it is obvious that a rate policer could= be applied in the host in addition to the proposed algorithm. But I still = believe that the proposed algorithm itself will result in data rates larger= than PIR in the scenarios I have explained (drops of the RTT), i.e., it does not meet the objective that =E2=80=9Ca TCP sender is never allowed to send data at a rate larger= than PIR=E2= =80=9D. Depending on how it is implemented, an additional rate policer for P= IR may drop packets already locally inside the host, because the congestion= control algorithm plays out too many packets. That would be very ineffecti= ve. If your objective is a congestion control algorithm that at most results in a rate of PIR, your algorithm ne= eds to change, IMHO.

=C2=A0

Also, I have said before that I believe TCP Reno can= outperform your algorithm for the same path with CIR/PIR. If you don=E2=80=99t b= elieve it, I suggest to look at the transfer times of medium sized transfers with a CIR << PIR over an larger RTT, and com= pare the performance of TCP Reno with your algorithm. IMHO you will find qu= ite a number of cases in which TCP Reno will complete such a data transfers= significantly faster than the algorithm in draft-han-tsvwg-cc-00. I have already explained the root cause earlier.= This effect should occur even if there is no PIR capping. It means that a = user could still request the guaranteed resources, but just use the existin= g TCP congestion control with it, and he will get better throughput and/or response times over the resources= that were requested. In that case, what benefit would a user have from usi= ng draft-han-tsvwg-cc-00?

=C2=A0

Finally, I cannot parse the figure in the e-mail bel= ow; this is useless without labels and the like. A statement =E2=80=9CWe wi= ll have more comparison test results (CC vs new CC) in the future=E2=80=9D is somewhat concerning. Before proposing an algorithm for IETF standardiza= tion, I believe that such a proposal must be comprehensively tested in simu= lations and measurements with real TCP stacks to ensure that the algorithm = is properly designed, works as expected, and indeed has benefits over what already exists. None of this is clear fo= r draft-han-tsvwg-cc-00.

=C2=A0

Michael

=C2=A0

=C2=A0

=C2=A0

=C2=A0

From: Scharf, Michael (Nokia - DE/Stuttgart) = [mailto:micha= el.scharf@nokia.com]
Sent: Sunday, March 18, 2018 12:09 AM
To: Lin Han <Lin.Han@huawei.com>
Cc: tcpm@ietf.org= ; tsvwg-chairs@ietf.org; 'iccrg@irtf.org' <iccrg@irtf.org>; Thomas Nadeau <tnadeau@lucidvision.com>; = Yingzhen Qu <yingzhen.qu@huawei.com>
Subject: RE: Questions on draft-han-tsvwg-cc-00

=C2=A0

Some follow-up= remarks inline [ms]

=C2=A0

Michael

=C2=A0

From: Lin Han [mailto:Lin.Han@huawei.com]
Sent: Sunday, March 18, 2018 12:40 AM
To: Scharf, Michael (Nokia - DE/Stuttgart) <michael.scharf@nokia.com> Cc: tcpm@ietf.org= ; tsvwg-chairs@ietf.org; 'iccrg@irtf.org' <iccrg@irtf.org>; Thomas Nadeau <tnadeau@lucidvision.com>; = Yingzhen Qu <yingzhen.qu@huawei.com>
Subject: FW: Questions on draft-han-tsvwg-cc-00

=C2=A0

=C2=A0Hi, Schar= f

=C2=A0

For some reason= , I did=C2=A0 not receive this thread, maybe my filter set has problem.<= /u>

=C2=A0

See below for m= ore clarification with [LH]

=C2=A0

Regards<= u>

=C2=A0

Lin

=C2=A0

From: = "Scharf, Michael= (Nokia - DE/Stuttgart)" <michael.scharf@nokia.com>
Date: Thursday, March 15, 2018 at 4:17 PM
To: "draft-han-tsvwg-cc@ietf.org" <draft-han-tsvwg-cc@ietf.org><= br> Cc: "tcpm@ie= tf.org" <tcp= m@ietf.org>, "tsvwg@ietf.org" <tsvwg@ietf.org>, "iccrg@irtf.org" <iccrg@irtf.org= >
Subject: Questions on draft-han-tsvwg-cc-00
Resent-From: <alias-bounces@ietf.org>
Resent-To: <yingzhen.qu@huawei.com>, <tnadeau@lucidvision.com>
Resent-Date: Thursday, March 15, 2018 at 4:17 PM

=C2=A0

Authors, all,

=C2=A0

I have read draft-han-tsvwg-cc-00. Below I have list= ed a number of questions, which I believe would have to be addressed when d= iscussing such a mechanism in the IETF or IRTF.

=C2=A0

This e-mail is strictly limited to the content of dr= aft-han-tsvwg-cc-00. As the draft does not specify how the CIR and PIR will= actually be guaranteed in the Internet, as well as how OAM signaling will = work at Internet scale, I will not comment here on these assumptions, except regarding requirements that stri= ctly follow from the content of the I-D. The technical, economical, and reg= ulation aspects of the assumptions are not in scope of TCPM and they need t= o be discussed and solved elsewhere.

=C2=A0

Questions on draft-han-tsvwg-cc-00:

=C2=A0

1/ The document seems to implicitly assume that netw= ork resources are reserved for *every* single TCP connection, right?=

=C2=A0

  • If that assumption is correct, it has to be spelt o= ut explicitly in the text and it has to be noted that the underlying techno= logy has to provide these capabilities *for every single* TCP connec= tion.
  • Otherwise sentences like =E2=80=9Cafter a TCP session is successfully=C2=A0 initiated its con= gestion window (cwnd) jumps to CIR=E2=80=9D would not make sense as multiple TCP = connections within an traffic aggregate policied by CIR/PIR could start to all send with CIR in parallel, which would trigger massive conges= tion.
  • As an example, in my readin= g draft-han-6man-in-band-signaling-for-transport-qos-00 would allow al= so reservations e.g. for aggregates of multiple TCP connections. Such an op= eration mode seems not be compatible with the suggested mechanism in this I-D, as far as I understand. So the r= equirements have to be made explicit.
  • Also, sentences such as =E2=80=9Cit is assumed that in bandwidth guaranteed networks there h= ave been network resources (bandwidths, queues etc.) dedicated to the TCP f= lows=E2=80=9D= have to be corrected to specify that for the mechanism in this draft to work correctly, the resources have to be guaranteed to ev= ery single TCP connection, not multiple =E2=80=9Cflows=E2=80=9D.<= /u>

[YQ]: no, it doesn=E2=80=99t assume that network res= ources are reserved for EVERY single TCP connection. It assumes when a TCP = connection uses this proposed congestion control, network resources need to= be reserved. The TCP example used in draft-han-6man-in-band-signaling= -for-transport-qos-00 is per-flow based, and the congestion control draft also assumes the resou= rces are reserved per-flow. We will add this clarification in the next vers= ion of the draft.

=C2=A0

[LH] The draft-han-tsvwg-c= c-00 is about the CC algorithm for =E2=80=9CNEW TCP=E2=80=9D setup by draft= -han-6man-in-band-signaling-for-transport-qos (I call it as =E2=80=9Ci= n-band signaling method=E2=80=9D below) or any other method that can provid= e a CIR/PIR QoS service for the =E2=80=9CNEW TCP=E2=80=9D.

As we said in in-band sign= aling method, the new in-band signaling method is not supposed to be used f= or applications that normal TCP (reno, cubic, etc) can satisfy the throughp= ut requirement. This is because the new method is more costly than normal TCP and involve network devices. Off= course, SP may charge it, but this is business issue.=

In the =E2=80=9Cin-band si= gnaling method=E2=80=9D, we do talk about three level of granularity for th= e signaling, but only the =E2=80=9CFlow level in-band signaling=E2=80=9D is= discussed in details. So, for this new CC draft, we can say each =E2=80=9C= NEW TCP=E2=80=9D session or flow will have a PIR/CIR.

Having said above, we can = come up some summary as follows:

  1. In a real deployment, We will u= se the in-band signaling method to setup =E2=80=9CNEW TCP=E2=80=9D, and eac= h =E2=80=9CNEW TCP=E2=80=9D will have PIR/CIR associated, and the CIR is gu= aranteed end-to-end for the session. For all these =E2=80=9CNEW TCP=E2=80=9D sessions, we suggest to use the CC method = described in draft-han-tsvwg-cc-00, since old CC is not very adaptive to th= e traffic behavior and network significance for =E2=80=9CNEW TCP=E2=80=9D; = i.e, the minimum rate is guaranteed in network level to pass without any congestion; the given maximum rate PIR cannot be exceeded, etc.=
  2. In the same network, there certainly have much more regular TCP session= s. For those TCP, they still use the old CC algorithm.
  3. The bandwidth resource is shared between =E2=80=9CNEW TCP= =E2=80=9D sessions and old TCP sessions in a simple way
    4. <= /span>
    1. The total reserved bandwidth fo= r all =E2=80=9CNEW TCP=E2=80=9D sessions is sum(CIR),
    2. The reserved bandwidth sum(CIR) still can be used for old= TCP if the total =E2=80=9CNEW TCP=E2=80=9D real bandwidth usage is less th= an sum(CIR).
    3. If total =E2=80=9CNEW TCP=E2=80=9D real bandw= idth usage is equal or less than sum(CIR), =E2=80=9CNEW TCP=E2=80=9D will a= lways grab the required bandwidth from the link un-used bandwidth and/or th= e bandwidth old TCP sessions are using.
    4. If total =E2=80=9CNEW TCP=E2=80=9D real band= width usage is great than sum(CIR), how much =E2=80=9CNEW TCP=E2=80=9D can = use are dependent on the remained bandwidth for the link.

=C2=A0

[ms] As far as= I can see,=C2=A0draft-han-6man-in-band-signaling-for-transport-qos ON= LY is not sufficient to guarantee the assumptions of this algorithm. IP pac= kets using this congestion control mechanism could be dropped due to congestion at devices that are not routers and do not proce= ss the IP or TCP header (e.g., a simple unmanaged Ethernet switch). So, the= draft must explicitly mention that an IP signaling mechanism such as draft= -han-6man-in-band-signaling-for-transport-qos is absolutely not sufficient for enabling this TCP congestion control. Dep= ending on the technology below IP used for different IP hops further mechan= isms must be used. It could also make sense to exclude in deployment sectio= n these sub-IP techniques for which there is currently no known technique to meet the requirements of deployin= g the algorithm. Such a list of technologies would probably be useful to ne= twork administrators as they have to ensure that the network using this alg= orithm does not include any link with such a technology.

=C2=A0

[LH] What you s= aid is correct, the =E2=80=9Cd= raft-han-6man-in-band-signaling-for-transport-qos=E2=80=9D only provid= es a method for IP network to support QoS for upper layer like TCP, but it does not help if IP network is tunneling through a non-IP network, like MP= LS or Ethernet switch. This is a topic needs further study and mentioned in= the section 5.4 =E2=80=9CHeterogeneous network=E2=80=9D in the =E2=80=9Cdr= aft-han-6man-in-band-signaling-for-transport-qos=E2=80=9D.

=C2=A0

=C2=A0

2/ =C2=A0Why does the document not rely on ECN (and = not even reference ECN)?

=C2=A0

  • For instance, the following requirement =E2=80=9CIt is important that OAM needs to be able to detect if any device's= =C2=A0 buffer depth has exceeded the pre-configured threshold, as this is a= n indication of potential congestion and packet drop=E2=80=9D could possibly be solved by ECN, no?
  • Even in case another OAM mechanism could be used in addition, a compre= hensive TCP congestion control specification would have to also cover the r= eaction to ECN marks as well, as well as the potential combination of feedback results. Why is this missing?
  • Or would the document mandates that ECN MUST NOT be enabled for T= CP connections using this congestion control mechanism?
    • <= /ul>

    [YQ]: This is a good point. We haven=E2=80=99t thoug= ht about combining OAM and ECN together. Will need to do some research and = figure it out.

    =C2=A0

    [LH] We just don=E2=80=99t= want to mess up with the current ECN usage; i.e, in a same device, =E2=80= =9CNEW TCP=E2=80=9D can coexist with all current TCP variations, and new CC= does not impact them.

    =C2=A0

    [ms] The =E2=80=9Cco-existie= nce=E2=80=9D would have to be specified, including the reaction to ECN marks.=

    =C2=A0

    [LH] we will sp= ecify this, and we don=E2=80=99t want to interfere with ECN mark and its al= gorithm

    =C2=A0

    3/ Why does the document assume that congestion wind= ows are calculated in segments and not in bytes?

    =C2=A0

    • RFC 5681 as well as many other RFCs calculate CWND = in bytes.
    • However, I believe equa= tions such =E2=80=9CMinBandwidthWND =3D CIR * RTT/MSS=E2=80=9D or =E2=80=9CMaxBandwidthWND =3D PIR * RTT/MSS=E2=80=9D would return a window counted in MS= S segments.
    • Apart from the mismat= ch with the TCP standards, this sort of equation might also requires a disc= ussion on how to deal with integer division.

    [YQ]: you=E2=80=99re right, indeed in this draft the= congestion windows are calculated in segments. We=E2=80=99ll some calculat= ions also in bytes, or how to make the conversion.

    =C2=A0

    =C2=A0

    4/ How does the mechanism deal with IP and TCP heade= r overhead?

    =C2=A0

    • TCP window sizes are about the TCP bytestream, whil= e the actual IP packets sent by a TCP/IP stack will include an IP and TCP h= eader. If one neglects the IP and TCP headers in the congestion window calc= ulation, the resulting IP packet rate will be larger than the CIR and PIR seen in t= he TCP layer. This could result in packet drops if CIR and PIR are enforced= e.g. for IP packet length.
    • How w= ill this problem be solved? Note that TCP (and also IP) can include header = options, which results in variable header sizes. The number of TCP options = can be different for each TCP segment. How does this congestion control mechanism correctly handle the headers and the opt= ions in IP and TCP headers?

    [YQ]: good point. The more accurate way is: the size= of real packets that got transmitted on the wire should be used to calcula= te how many packets can be transmitted using the bandwidth reserved. We=E2= =80=99ll add this in the next version.

    =C2=A0

    3/ How does the document deal with RTT variations? I= s the assumption that the RTT is constant?

    =C2=A0

    • As far as I can tell from experiments, the RTT esti= mation is important when applying a rate to window-based congestion control= , which is what this document does.
    • Equations such =E2=80=9CMinBandwidthWND =3D CIR * RTT/MSS=E2=80=9D or =E2=80=9CMaxBandwidthWND =3D PIR * RTT/MSS=E2=80=9D only provide a window equivalent to= the bandwidth-delay product of the path if the RTT sample is a correct pre= diction of the actual delay that the segments in flight will experience. How does = the mechanism suggested in this document correctly predict the future RTT o= f the segments that are sent by the sender at a given point in time?=
    • As an example, assume that the RTT at t= ime t=3D10s is determined as 80ms. Assume PIR =3D 10 Mbps and neglect the q= uestions 3/ and 4/. Then this document would probably assume that MaxBandwi= dthWND=3D100 kB is the bandwidth delay product of the path during t=3D10s and t=3D10.08s, i.e., t= he maximum amount of outstanding data that can be sent in that time without= drops (or exceeding PIR). But assume that the actual round-trip delay of s= egments has dropped to 40ms after the last RTT management, which means that the maximum bandwidth delay product = of the path at t=3D10s+epsilon is only 50 kB. As a result, 50 Kb out of the= congestion window would likely be dropped during t=3D10s and t=3D10.08s. A= nd, due to the wrong RTT value, the effective data rate of the sender could even be 20 Mbps, if the RTT mismatch is not = detected immediately, or, e.g., if EWMA will delay the update of the weight= ed RTT parameter to the actual value.
    • So how does the proposed scheme to indeed determine a window that meet= s the statement =E2=80=9CThis means a TCP sender is never allowed to send data at a rate larger t= han PIR=E2=80= =9D =C2=A0if the RTT is not constant? Does this assume rate pacing i= n the TCP sender for each TCP connection?

    =C2=A0[YQ]: no, RTT is not assumed to be constant in= this draft. It=E2=80=99s calculated using RTT =3D a* old RTT + (1-a) * new= RTT=C2=A0=C2=A0 (0 < a < 1)=C2=A0=C2=A0 (1)

    =C2=A0

    [ms] And, as e= xplained in my example, the statement =E2=80=9CThis = means a TCP sender is never allowed to send data at a rate larger than PIR<= /span>=E2=80=9D is not met by the current desi= gn of the algorithm. I have provided an actual example where the algorithm = breaks. Please explain how the algorithm ensures that a TCP sender never se= nds more than PIR over links with variable RTT.

    =C2=A0

    [LH] Do not all= ow the rate exceeding the PIR is to regulate the traffic at ingress to redu= ce the burst of traffic. This will effectively reduce the buffer depth and = the worst case latency.

    After per flow = shaping, we will mark the color to different rate of traffic: GREEN (rate&l= t;CIR); YELLOW(CIR<rate<PIR) and RED (rate>PIR). The GREEN traffic= will always get scheduled at egress side after IP forwarding process; the YELLOW traffic will be scheduled if the egress buffer depth i= s less than some pre-configured value (i.e, 70%), and will be dropped if th= e buffer depth is exceeding the pre-configured value.<= /p>

    We can easily d= o nothing after rate exceeding CIR, but this will make PIR parameter meanin= gless. We use PIR and CIR instead of CIR only is because this is a traditio= nal definition from QoS point of view. We have already simplified the definition, and removed some parameters like CB (co= mmitted burst) and ECB (Exceeding Committed burst), etc.

    If we want to h= ave the behavior of reno, user can easily set the PIR as a very high value = or even link bandwidth, the traffic will get to the equilibrium point cause= d by congestion before reaching up its PIR. If the community think this is more reasonable solution (don=E2=80=99t not= cap the rate to PIR at ingress), we can easily change the rule in hardware= and CC algorithm accordingly.

    =C2=A0

    4/ How is it ensured that OAM alarms will reach the = TCP sender in time in all possible =E2=80=9Crandom failure=E2=80=9D cases?

    =C2=A0

    • As far as I understand= , the following statement =E2=80=9CWhen a sender receives the third duplicated ACK, but no previous OAM con= gestion alarm has been received, then it is considered that a segment is lo= st due to random failure not congestion.=C2=A0 In this case the cwnd is not changed.=E2=80=9D mandates that an OAM alarm is received prior t= o the third duplicate ACK *in all potential cases* of congestion. If= the OAM alarm got lost or delayed, this condition would imply that cwnd is not changed despite a segment has been dropped due to c= ongestion, which would be a violation of fundamental Internet congestion co= ntrol principles.
    • Please expand on how this document ensures that cwnd will be = reduces in all potential cases when a packet gets dropped due to congestion= , and what requirements on the OAM alarms propagation follow from that. Of specific interest are effects such as packet drops of= packets relevant for the OAM information, reordering of packets, asymmetri= c routing in forward and reverse direction, use of multiple paths in parall= el (ECMP), and the like. If the document makes assumption about the path such as in-order packet delivery = or the like, these assumptions need to be spelt out explicitly.
    • I understand th= at the OAM could be solved in different ways and the solution is independen= t of this document. But this document has to comprehensively specify all te= chnical requirements that the OAM mechanism has to meet in order to ensure that every single pa= cket drop due to congestion always results in a cwnd reduction. Otherwise t= he algorithm has to change as it does not safely prevent congestion.=

    =C2=A0[YQ]: in case an OAM alarm for congestion is l= ost, currently cwnd is not changed. The chance of packet loss due to conges= tion might be increased, so an OAM alarm should be received soon. But I agr= ee more design/considerations should be added here.

    =C2=A0

    [LH] if the OAM alarm msg = is lost, we loss the capability to distinguish the random failure and the c= ongestion loss, we will treat the loss as congestion loss. This is not wors= e than current reno.

    =C2=A0

    [ms] This is n= ot what is written in the draft so the algorithm will need to change. As a = side note, the IETF has tried many years to find a solution of how to disti= nguish congestion loss and random failures. If the algorithm wants to make that distinction, it has to explain how all= congestion packet losses will always be detected.

    =C2=A0

    [LH] will make = it clear in the document.

    =C2=A0

    5/ What is the expected performance benefit? Are the= re situations in which performance will be worse than standard TCP congesti= on control?

    =C2=A0

    • The document does not contain any data of potential= improvements or deteriorations as compared to the TCP standard congestion = control. I assume that such data will be presented to explain why this mech= anism is proposed, and what benefits it has.
    • As I have experimented with similar mechanisms quite a bit, I believ= e there will be cases in which this congestion control mechanism will perfo= rm worse than a TCP sender fully compliant to RFC 5681, when using the same network path with CIR and PIR guarantees. I believe this do= cument should analyze these cases and reason why a worse performance than s= tandard TCP congestion control will be acceptable. IMHO this issue will spe= cifically apply in cases when PIR is significantly larger than CIR, and if the RTT is large. As far as I can= see, this draft mandates to start the data transfer in congestion avoidanc= e at CIR rate, which means that it can take many RTTs until the sender reac= hes the PIR. In contrast, RFC 5681 will run slow-start, and RFC 5681 states that the =E2=80=9Cinitial value o= f ssthresh SHOULD be set arbitrarily high=E2=80=9D. This means that the TCP= sender can reach PIR within few RTTs and thus can send with full PIR speed= , while a sender using draft-han-tsvwg-cc-00 will send with a much lower speed CIR+epsilon. For short and medium-sized data = transfers, IMHO it can happen that the congestion control according to RFC = 5681 will significantly outperform the mechanism suggested in this document= , i.e., it will complete data transfers orders of magnitude faster even without any knowledge about CIR and PIR. H= ave the authors compared this mechanism to the performance of RFC 5681?<= /u>
    • Also, have the authors compared the = performance of this mechanism as compared to a modern TCP stack, which ofte= n use RFC 6928 (IW 10) and RFC 8312 (CUBIC)? In what cases has the suggeste= d congestion control a better performance? I ask this because I have performed experiments 10 y= ears ago with congestion control schemes that have some similarity to what = is suggested here, and they also used knowledge about the path properties. = In those experiments, it turned out to be quite difficult to design an algorithm that uses knowledge about= the path (such as CIR/PIR) and that outperforms CUBIC in combination IW 10= , even if such a stack is totally unaware of the path. This has been discus= sed e.g. in ICCRG https://www.ietf.org/= proceedings/73/slides/iccrg-2.pdf. As context, =E2= =80=9Cmore-start=E2=80=9D in this document is somewhat similar to what is p= roposed in this I-D (but applied to CUBIC), while the =E2=80=9Cinitial-start=E2=80=9D= graphs somehow corresponds to what was later specified in RFC 6928 (IW 10)= and RFC 8312 (CUBIC).

    [YQ]: Totally agree. This is not a one to fit all so= lution, it has its usage limitations. Detail comparisons and suggestion on = when to use this algorithm will be added later.

    =C2=A0

    [LH] Cannot be, as I said = for question one, the new CC is just a improvement over the current TCP-ren= o when used for =E2=80=9CNEW TCP=E2=80=9D. It makes the TCP-reno adapted to= the new behavior of =E2=80=9CNEW TCP=E2=80=9D, the logic is very straightf= orward.

    =C2=A0

    [ms] As I show= n in my example, there will be cases in which this proposed congestion cont= rol is *not* an improvement over TCP Reno. There will be cases in wh= ich it transfers data significantly slower than TCP Reno, and this will affect interactive applications that need e.g. ver= y fast response times. An application designer will observe that even TCP R= eno can give better performance over the same network. For some cases I thi= nk one can even calculate explicitly how much slower this algorithm is as compared to TCP Reno, and how much wo= rse application performance will be =E2=80=93 the = effect and its root cause is so simple that one does not even need any impl= ementation for calculating how much worse this algorithm is than TCP Reno. I believe that application developers would be interested in understanding= when (and why) this algorithm is slower than a standard-compliant TCP over= the same network.

    =C2=A0

    [LH]See the exp= lanation for question 3.

    I guess this is= the major misunderstanding point from our document, we need to make docume= nt more clear in this regard.

    The new CC is n= ot to compete with reno in throughput for any case since it does not need t= o, it try to make reno more adaptive to the new traffic behavior enforced b= y the QoS. The QoS itself will provide completely different behavior with traditional TCP CC, see below (PIR=3DCIR; B1, B2 a= re new TCP set by in-band signaling and without changes of CC, n1 and n2 ar= e reno).

    It seems that I= n-band signaling method can have =E2=80=9Cbetter throughput=E2=80=9D than t= raditional TCP, but is it surprised? No, Off course not, QoS will be better= than best-effort! The better throughput is not caused by new CC, it is caused by QoS. Directly comparing new CC with reno for throughpu= t does not make sense -J New CC means no= thing without the per-flow QoS .

    Picture below a= lso shows the new TCP will always provide the expected throughput no matter= how much bandwidth used by other traditional TCP. We will have more compar= ison test results (CC vs new CC) in the future.

    =C2=A0

    3D"Rate(Kbps)"=3D"Rate(Kbps)"3D"Time(s)"= =

    =C2=A0

    =C2=A0

    =C2=A0

    6/ For what application traffic patterns is this mec= hanism proposed?

    =C2=A0

    • The document states in Section 3 =E2=80=9C=E2=80=A6= with the development of new applications, such as AR/VR=E2=80=9D. What pro= perties do such applications have to leverage the mechanism suggested in th= is document? Is it possible to characterize what the =E2=80=9Cnew=E2=80=9D requirements are, and how t= he suggested algorithm meets these requirements?
    • Is it suggested to apply this congestion control to real-ti= me media traffic over TCP? If so, what would be the benefit of using TCP in= general and of the specific mechanism compared to congestion control algorithm for such traffic (e.g., the RMCAT working group)?<= /li>

    [YQ] same as above answer, the exact traffic pattern= s that can benefit from this algorithm will be studied in more detail and p= rovided in later version of the draft.

    =C2=A0

    [ms] I assume = that =E2=80=9C= later version=E2=80=9D means =E2=80=9Cnext version=E2=80=9D. It is pointless to further discuss a congestion control algorithm without details about workloads and= the algorithm performance, resulting from simulations, actual measurement = from implementations, etc. Such data can also be published at research conf= erences or in research journals prior to presenting it in the IRTF or IETF.

    =C2=A0<= u>

    Michael=

    =C2=A0

    =C2=A0

    This list of questions is not comprehensive, but I= =E2=80=99ll stop here.

    =C2=A0

    Regarding potential next steps of this document in t= he TCPM working group, I believe that the applicable TCPM charter wording i= s: =E2=80=9CIn addition, TCPM may document alternative TCP congestion control algori= thms that are known to be widely deployed, and that are considered safe for= large-scale deployment in the Internet.=E2=80=9D Until these prerequisites are fulfilled in the Internet, in my view the do= cument cannot be adopted in TCPM. Research could be performed in the IRTF, = e.g., in ICCRG.

    =C2=A0

    Thanks

    =C2=A0

    Michael (with no hat on)


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<152145102871.15982.10398537380130204532.idtracker@ietfa.amsl.com> Date: Mon, 19 Mar 2018 02:17:08 -0700 From: IETF Secretariat Archived-At: Subject: [tcpm] Milestones changed for tcpm WG X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Mar 2018 09:17:09 -0000 Changed milestone "Submit document on TCP converters to the IESG for publication as an Experimental RFC", added draft-ietf-tcpm-converters to milestone. URL: https://datatracker.ietf.org/wg/tcpm/about/ From nobody Mon Mar 19 02:36:43 2018 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id B48EC12702E for ; Mon, 19 Mar 2018 02:36:41 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit To: X-Test-IDTracker: no X-IETF-IDTracker: 6.75.2 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <152145220173.15896.13084700435092573406.idtracker@ietfa.amsl.com> Date: Mon, 19 Mar 2018 02:36:41 -0700 From: IETF Secretariat Archived-At: Subject: [tcpm] Milestones changed for tcpm WG X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Mar 2018 09:36:41 -0000 Changed milestone "Submit document on Alternative Backoff with ECN to the IESG for publication as Experimental RFC", set state to active from review, accepting new milestone. URL: https://datatracker.ietf.org/wg/tcpm/about/ From nobody Mon Mar 19 04:17:27 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 79684127599 for ; Mon, 19 Mar 2018 04:17:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CfiLqV2_l0Zw for ; Mon, 19 Mar 2018 04:17:24 -0700 (PDT) Received: from mail-yw0-x22d.google.com (mail-yw0-x22d.google.com [IPv6:2607:f8b0:4002:c05::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BCC5A12741D for ; Mon, 19 Mar 2018 04:17:24 -0700 (PDT) Received: by mail-yw0-x22d.google.com with SMTP id r66so11225083ywh.10 for ; Mon, 19 Mar 2018 04:17:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=hG3W98bDyOeGu/CnJ3sRxgyefpffsVNBsyBDsiRjOtU=; b=iDhpVn+dFYvTd7dNx0CLmeZLqO/nKhqyI9etkccPXptqrwd+1rsHwrXJJk+m93zbIj K385UIW4E/tt4AqbVdhVQqLKZqHYuGL3mXCYrYV3h5c6BLXrLwUoyTOhNC/3vmFVPJmj NHoz++pG5WTnucWMAajuq+joocy32iag9Lcr2rK0Bngjxbk1JHesT7HqUzqOITHe41t6 waXv7eYDsw/qMhCG8HKQnyMLyIcxqaayRO7ltBCTCzDF2FeJDsXSc4LMOdSZA1RPBFtm s9wTjw78/iUB83PNH2DGo6gwhX3j4BPIXR7ODMk5gR2Ca+8eegabc5dA6Bf7z2WePhuO twKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=hG3W98bDyOeGu/CnJ3sRxgyefpffsVNBsyBDsiRjOtU=; b=iLFdnZceZYnLONrbTFtsyzcQKeC2CcNYpPvmLiLR4BAljyQ62Ya7JHOoB7W8R44C/f ZtB8H2IQ4R48nAwLLH45pQW60s/lPNOnVCm2mXLQc4tYrgaKPx73F6iVsb/2+bqoL9Nx 0HBG9Ub0oPd51xlR6YfEyb8fVYkMLkz+j8KMvb5bssiBkTASVswF5EcOHdCk+tAnu3Wn 4UUfJre8D+X9pVoRKBYsKqLebs/KSxcTiu3lD08V8VpPvZKrJ62S/cvMzUQ9aNNn3e8+ 5TfIQptfr2yPKUpCYLTFQmzS5tFC8C511cEU1c0+n3IG0c994udjk9FkkW3RJ36d7W5Z NZsw== X-Gm-Message-State: AElRT7EzEPcYv8Az4CPwuaVw90hRlfp75a1ztlDJwx3pqnCvLKsDAJf7 H3wYShNswcup77onWie+jyM7x3hYdT2vNdZbwmk= X-Google-Smtp-Source: AG47ELsSbLhFv2nhVOkFBzmFnaFxc1OekhHV89D7f08q4S+5tNskrrUeuiGwnERWkGx96I5l7c6s+2OE1xHMLx/9c4Q= X-Received: by 10.13.192.198 with SMTP id b189mr417282ywd.52.1521458243801; Mon, 19 Mar 2018 04:17:23 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a25:6b4d:0:0:0:0:0 with HTTP; Mon, 19 Mar 2018 04:17:23 -0700 (PDT) In-Reply-To: References: <27982D64-95F7-48DB-AADE-F8D3015CF790@huawei.com> <1D30AF33624CDD4A99E8C395069A2A162CDBC402@sjceml521-mbs.china.huawei.com> <1D30AF33624CDD4A99E8C395069A2A162CDBC911@sjceml521-mbs.china.huawei.com> From: Spencer Dawkins at IETF Date: Mon, 19 Mar 2018 11:17:23 +0000 Message-ID: To: "Scharf, Michael (Nokia - DE/Stuttgart)" Cc: "tcpm@ietf.org" , "iccrg@irtf.org" Content-Type: multipart/alternative; boundary="001a114e6f6229aa450567c21aa7" Archived-At: Subject: Re: [tcpm] [iccrg] Questions on draft-han-tsvwg-cc-00 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Mar 2018 11:17:26 -0000 --001a114e6f6229aa450567c21aa7 Content-Type: text/plain; charset="UTF-8" Michael, On Sun, Mar 18, 2018 at 11:58 PM, Scharf, Michael (Nokia - DE/Stuttgart) < michael.scharf@nokia.com> wrote: > draft-irtf-iccrg-tcpeval-01 and RFC 5033 are newer > > > > RFC 5033 is only a short BCP but still useful IMHO > > > > Michael > This is EXTREMELY helpful. I see that RFC 5033 was published in 2007 while I was working on SIP in the former RAI area - I probably saw the announcement for it, because I was remembering SOMETHING newer than 1999, but couldn't remember details. Thanks for all your thoughts. Spencer --001a114e6f6229aa450567c21aa7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Michael,

On Sun, Mar 18, 2018 at 11:58 PM, Scharf, Michael (Nokia - DE/Stutt= gart) <michael.scharf@nokia.com> wrote:

draft-irtf-iccrg-tcpeval-01 and RFC 5033 are newer

=C2=A0

RFC 5033 is only a short BCP but still useful IMHO

=C2=A0

Michael


<= div>This is EXTREMELY helpful. I see that RFC 5033 was published in 2007 wh= ile I was working on SIP in the former RAI area - I probably saw the announ= cement for it, because I was remembering SOMETHING newer than 1999, but cou= ldn't remember details.=C2=A0

Thanks for all y= our thoughts.

Spencer=C2=A0
--001a114e6f6229aa450567c21aa7-- From nobody Mon Mar 19 04:26:30 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 74417127077 for ; Mon, 19 Mar 2018 04:26:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.311 X-Spam-Level: X-Spam-Status: No, score=-4.311 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cs.helsinki.fi Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Lccg5O5mzh49 for ; Mon, 19 Mar 2018 04:26:26 -0700 (PDT) Received: from script.cs.helsinki.fi (script.cs.helsinki.fi [128.214.11.1]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7CE2D12741D for ; Mon, 19 Mar 2018 04:26:26 -0700 (PDT) X-DKIM: Courier DKIM Filter v0.50+pk-2017-10-25 mail.cs.helsinki.fi Mon, 19 Mar 2018 13:26:19 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.helsinki.fi; h=date:from:to:cc:subject:in-reply-to:message-id:references :mime-version:content-type; s=dkim20130528; bh=+tZCAJ11uNLDc8JSH 3ByzMAjArR55RCZZW20e+bMBDw=; b=SG9w53Fb1BDm1oPTHRdQRXScFk37cUOmT uFTNJ1LrGac+TgUKB/xvfthsdvoJByNCDTeU6/alZHHurQOKGcVAWH3hKi4R/4CJ V9VxfeHqNO7NDRqWq9H0oRVUuSl51sYd6SwBZH+F4fUUpNW1uoBXGfG0OZvD96XK 7gKjgG3vGo= Received: from dhcp-9f9c.meeting.ietf.org (dhcp-9f9c.meeting.ietf.org [31.133.159.156]) (AUTH: PLAIN kojo, TLS: TLSv1/SSLv3,256bits,AES256-SHA) by mail.cs.helsinki.fi with ESMTPSA; Mon, 19 Mar 2018 13:26:19 +0200 id 00000000005A001C.000000005AAF9E5B.000025EA Date: Mon, 19 Mar 2018 13:26:17 +0200 (EET) From: Markku Kojo To: Michael Welzl cc: Michael Tuexen , tcpm@ietf.org In-Reply-To: <9342CFB0-D086-4CB3-B301-228B7CCBDAFB@ifi.uio.no> Message-ID: References: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> <9342CFB0-D086-4CB3-B301-228B7CCBDAFB@ifi.uio.no> User-Agent: Alpine 2.02 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="=_script-9728-1521458779-0001-2" Archived-At: Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Mar 2018 11:26:28 -0000 This is a MIME-formatted message. If you see this text it means that your E-mail software does not support MIME-formatted messages. --=_script-9728-1521458779-0001-2 Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: quoted-printable Hi, On Sat, 17 Mar 2018, Michael Welzl wrote: [snip] > I=E2=80=99ll repeat that we never intended to change anything else but = the backoff factor. > The wording change was the result of having to be more explicit (becaus= e we can=E2=80=99t simply say > =E2=80=9Csimilar to loss=E2=80=9D, which automatically refers back to R= FC 5681 rules). Thus, I think we agree > that this is just an editorial fix. Sure, it was also my understanding that the draft is intended just to=20 modify the backoff factor. As we have incorrect implementation(s) of this deployed and a=20 misconception that TCP cwnd has a lower bound of 2*MSS has been around there (e.g., several iccrg / transport area wg presentations have=20 misleadingly stated this), I find it very important that the draft is=20 precise and explicit on describing this. Cheers, /Markku --=_script-9728-1521458779-0001-2-- From nobody Mon Mar 19 06:40:03 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E08EA12D962; Mon, 19 Mar 2018 06:39:46 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ccfC0UIWFwiV; Mon, 19 Mar 2018 06:39:44 -0700 (PDT) Received: from drew.franken.de (mail-n.franken.de [193.175.24.27]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B815B12741D; Mon, 19 Mar 2018 06:39:30 -0700 (PDT) Received: from dhcp-9621.meeting.ietf.org (dhcp-9621.meeting.ietf.org [31.133.150.33]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTPSA id 75996721E2822; Mon, 19 Mar 2018 14:39:27 +0100 (CET) From: Michael Tuexen Message-Id: <76D50896-68AD-4799-9909-41B72ADAAD47@fh-muenster.de> Content-Type: multipart/signed; boundary="Apple-Mail=_447183A9-F61A-404B-B9CC-5C8A54FCF089"; protocol="application/pkcs7-signature"; micalg=sha1 Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) Date: Mon, 19 Mar 2018 13:39:24 +0000 In-Reply-To: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> Cc: tcpm-chairs@ietf.org, tcpm@ietf.org To: =?utf-8?Q?Michael_T=C3=BCxen?= References: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> X-Mailer: Apple Mail (2.3445.5.20) Archived-At: Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Mar 2018 13:39:50 -0000 --Apple-Mail=_447183A9-F61A-404B-B9CC-5C8A54FCF089 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii > On 28. Feb 2018, at 20:12, Michael Tuexen = wrote: >=20 > Dear all, >=20 > this e-mail starts the working group last call for = draft-ietf-tcpm-alternativebackoff-ecn-06. >=20 > This WGLC runs until Friday, March 16th 2018. Please send any = comments, including indications > to support this document, to the TCMP mailing list by then. >=20 > The ID is available at > https://tools.ietf.org/html/draft-ietf-tcpm-alternativebackoff-ecn-06 Dear all, this mail closes the working group last call = draft-ietf-tcpm-alternativebackoff-ecn-06. Thanks to everyone for providing feedback! I ask the document editors to revise the document according to the = feedback they got. These are all editorial changes in my view. Best regards Michael >=20 > Best regards > Michael_______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm --Apple-Mail=_447183A9-F61A-404B-B9CC-5C8A54FCF089 Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIQkDCCBNUw ggO9oAMCAQICCFBOxvU9EbRkMA0GCSqGSIb3DQEBCwUAMHExCzAJBgNVBAYTAkRFMRwwGgYDVQQK ExNEZXV0c2NoZSBUZWxla29tIEFHMR8wHQYDVQQLExZULVRlbGVTZWMgVHJ1c3QgQ2VudGVyMSMw IQYDVQQDExpEZXV0c2NoZSBUZWxla29tIFJvb3QgQ0EgMjAeFw0xNDA3MjIxMjA4MjZaFw0xOTA3 MDkyMzU5MDBaMFoxCzAJBgNVBAYTAkRFMRMwEQYDVQQKEwpERk4tVmVyZWluMRAwDgYDVQQLEwdE Rk4tUEtJMSQwIgYDVQQDExtERk4tVmVyZWluIFBDQSBHbG9iYWwgLSBHMDEwggEiMA0GCSqGSIb3 DQEBAQUAA4IBDwAwggEKAoIBAQDpm8NnhfkNrvWNVMOWUDU9YuluTO2U1wBblSJ01CDrNI/W7MAx BAuZgeKmFNJSoCgjhIt0iQReW+DieMF4yxbLKDU5ey2QRdDtoAB6fL9KDhsAw4bpXCsxEXsM84Ik 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X-Spam-Score: -2.161 X-Spam-Level: X-Spam-Status: No, score=-2.161 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, STOX_REPLY_TYPE=0.439, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5-hm8cDMr1jN; Mon, 19 Mar 2018 08:31:32 -0700 (PDT) Received: from mout.gmx.net (mout.gmx.net [212.227.17.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 042ED12DA12; Mon, 19 Mar 2018 08:31:30 -0700 (PDT) Received: from srichardlxp2 ([213.143.121.76]) by mail.gmx.com (mrgmx101 [212.227.17.168]) with ESMTPSA (Nemesis) id 0Lusmr-1eX6FM16mn-0108N3; Mon, 19 Mar 2018 16:31:21 +0100 Message-ID: From: "Richard Scheffenegger" To: "Scharf, Michael \(Nokia - DE/Stuttgart\)" , =?UTF-8?Q?Mirja_K=C3=BChlewind?= Cc: , References: <44FDECF5-A031-4343-BA1A-AE0D9C2C078C@tik.ee.ethz.ch> Date: Mon, 19 Mar 2018 16:26:38 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="UTF-8"; reply-type=original Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 X-Provags-ID: V03:K0:kp3OSQMW/HzRbsCeB+NKVejVcXO9LH7wDlN5QJ4PPxHALBqFtwG SNHbOdu4XclCUOkPON9iy3FAXhbZE5/sGCNJ1GsmBKSwH4LLtclAKr0oND2gP5qEc91hF7Q w+w2J44G4oKz82WecEeb5OFGENwd34tILtipiSdMCE9q8UZE8Z9s+19KI3E4PtwKWNKW9Oo Z3WP6JnwHxdszZ8XtGvfA== X-UI-Out-Filterresults: notjunk:1;V01:K0:3KtlZZtY+6E=:hI5Od4GIqQvjmJtl5Pkl4S dOYm6NWdr3I8S4TTGvE3CXF7WhOq8nTrczbxCw1X6qHihNzNM6DxatkGL6ms1YArMZdMNYPIL HwBdt5Q9WqZn2R2OS7Bu3xVG4hwVemFNxZo7QLZx55GYMwLwr3NesqR2HNbSiEvToniX4rAbr WECntjoMD3Pgdf0Kr6o+jR5K7slkkyuQwy6TlntaVPwxZo99m8Caf0QtmHQW19aq4MOy/UurK J6ht6bmEocN3bs8ngJMviqYkR1USfZReXX8UUB8DaSDvN4j0DuGMIG4F7IiecoJIvLGXcxPQ7 KOeAmVMnhw1m6hoPMIn02uQ8ytfTJNXqaDdFyMunNppELekCTJjoE+oBcdZzUzafDP/Wo5t/c c86oGvjVwULY/e26K9ubRXQgtGOMiy/M7fMq9LGoE1I1QsVoVMo7F7krWxhvOijGMZ1eFfwBn foSfVqplPbtpSC3UML8w0toVfOclM+fhfn6EZgPr3jlRtYoY9pwJmVtxjlkc3yq67VB8LUVDl v1mj8RJuyaDjOuQlP4w/eE5yPKngdv/ysCHO50/ZQxqPjA8BqQgbZypHjCvCSppsHlQCgQY80 +SZDDB99DrIoqs8taLVRJmn2lnvNwy1IBAYsDzKWbarMBY7/4bczF7H2Rtogi8r8lILVY0E3G yNQCPGdAeJZsPNzqzKZC6OdBsy3omQFfRTt4YS+4rpB7npzzCG65zpq85njgNdUhKf4hS3d38 nixchQRAp4Hkv6ou6aiZ3eJwca7MGXHhqajc3Gb41q7rO2VhbFFEY+XOD31wpr5YctVmvn5IS aY5JTFg+Mktf9q8fi6WVvg/mh0esdxq5krGIPTKzlVo/lPBiEE= Archived-At: Subject: Re: [tcpm] Comments on draft-ietf-tcpm-accurate-ecn X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Mar 2018 15:31:44 -0000 Hi Michael, regarding your comment about the lack of future extensibility of the ECN / AccECN header handshake without further bits... I wanted to note, that the logic table we have in the accecn draft currently has two entries, that are reserved because of observed, but legacy, stacks misbehaving when reflecting these TCP header bits. So there is a possibility to eventually use those entries - once the broken legacy stacks have been confirmeed to have left the internet - as some additional negotiation capability. Also, the feedback of the byte counters vs. CE packet counter are split into using a tcp option and the tcp header bits. An extention of AccECN could take the form of using a differen TCP option together with the header counter negotiation... Earlier work by us determined that packing more information into the tcp header bits alone (as an example) would likely need an additional bit (that can also be used in a negotiation scheme)... +--------+--------+------------+-------------+----------------------+ | A | B | SYN A->B | SYN/ACK | Feedback Mode | | | | | B->A | | +--------+--------+------------+-------------+----------------------+ | | | AE CWR ECE | AE CWR ECE | | | AccECN | AccECN | 1 1 1 | 0 1 0 | AccECN (Not-ECT on | | | | | | SYN) | | AccECN | AccECN | 1 1 1 | 0 1 1 | AccECN (ECT1 on SYN) | | AccECN | AccECN | 1 1 1 | 1 0 0 | AccECN (ECT0 on SYN) | | AccECN | AccECN | 1 1 1 | 1 1 0 | AccECN (CE on SYN) | | | | | | | # | AccECN | Nonce | 1 1 1 | 1 0 1 | classic ECN | | AccECN | ECN | 1 1 1 | 0 0 1 | classic ECN | | AccECN | No ECN | 1 1 1 | 0 0 0 | Not ECN | | | | | | | | Nonce | AccECN | 0 1 1 | 0 0 1 | classic ECN | | ECN | AccECN | 0 1 1 | 0 0 1 | classic ECN | | No ECN | AccECN | 0 0 0 | 0 0 0 | Not ECN | | | | | | | # | AccECN | Broken | 1 1 1 | 1 1 1 | Not ECN | +--------+--------+------------+-------------+----------------------+ Best regards, Richard ----- Original Message ----- From: "Scharf, Michael (Nokia - DE/Stuttgart)" To: "Mirja Kühlewind" Cc: ; Sent: Monday, March 12, 2018 1:59 AM Subject: Re: [tcpm] Comments on draft-ietf-tcpm-accurate-ecn > Hi Mirja, > > Thanks a lot for the explanation. I won't follow-up on some of the > editorial suggestions. > > Yet, I continue to believe that some formal wording in the document needs > to change, as explained below. > > Thanks > > Michael (with no hat on) > > >> -----Original Message----- >> From: Mirja Kühlewind [mailto:mirja.kuehlewind@tik.ee.ethz.ch] >> Sent: Monday, March 05, 2018 1:54 PM >> To: Scharf, Michael (Nokia - DE/Stuttgart) >> Cc: draft-ietf-tcpm-accurate-ecn@ietf.org; tcpm@ietf.org >> Subject: Re: Comments on draft-ietf-tcpm-accurate-ecn >> >> Hi Micheal, >> >> thanks for your feedback and sorry for my late reply. >> >> Please see inline. >> >> > Am 03.12.2017 um 20:17 schrieb Scharf, Michael (Nokia - DE/Stuttgart) >> : >> > >> > Hi all, >> > >> > I have read draft-ietf-tcpm-accurate-ecn-05 (without the appendix). I >> believe this document needs further work before moving forward. >> > >> > Please find below my comments marked as [ms]. I have read the >> document independent of the review from Gorry. I apologize if there is >> duplication. >> > >> > Thanks >> > >> > Michael (with no hat on) >> > >> > >> > ****************************** >> > >> > * Abstract: >> > >> > Recently, new TCP mechanisms like Congestion Exposure (ConEx) or >> > Data >> Center TCP >> > (DCTCP) need more accurate ECN feedback information whenever more >> > than one marking is received in one RTT. >> > >> > [ms] I don't think this statement is fully backed by RFC 8257. I >> > suggest to >> remove this, or replace it by a more generic statement that more accurate >> information can be useful for several TCP extensions. >> >> I disagree. Both ConEx and DCTCP need more accurate information. They do >> not need the mechanism that is specified in this draft, however, this is >> not >> what the sentences is saying. > > In my understanding (as a non-native speaker), the use of the word "need" > is not correct here. DCTCP as specified in RFC 8257 can be implemented > without any such mechanism. > > What would work for me is something of the form "... Data Center TCP > cannot get precise ECN feedback whenever more than one marking is received > in one RTT". > >> > This document specifies an >> > experimental scheme to provide more than one feedback signal per RTT >> > in the TCP header. Given TCP header space is scarce, it overloads >> > the three existing ECN-related flags in the TCP header and provides >> > additional information in a new TCP option. >> > >> > [ms] This statement needs to be rewritten to correctly reflect what is >> requested from IANA. My understanding is that this experimental document >> asks for allocation of a reserved TCP header flag. This needs to be >> called out >> prominently, IMHO. In addition, since this is not a standard, the >> suggested >> experimentation with the main TCP header must IMHO be explicitly >> mentioned. I also suggest to have later in a document a section that >> explicitly >> explains why it is appropriate to modify the main TCP header in an >> experiment. >> >> I don’t know if any requirement that IANA assignment need to be called >> out >> in the abstract but we can do that. However, I believe the question if >> this >> document should or should not assign the bit is still not completely >> solved, or >> is it? > > I believe this question will have to be reviewed during WGLC and, more > importantly, IETF last call. For the moment, my concern is that the > document correctly describes the IANA allocation. > > I would like to see here a statement such as : "Given TCP header space is > scarce, this specification allocates a reserved header bit and overloads > the two ECN flags in the TCP header ...". > >> > * 1. Introduction >> > >> > Recently, proposed mechanisms like Congestion Exposure (ConEx >> > [RFC7713]), DCTCP [RFC8257] or L4S [I-D.ietf-tsvwg-l4s-arch] need >> > more accurate ECN feedback information whenever more than one >> marking >> > is received in one RTT. >> > >> > [ms] At least for RFC 8257 seems to be implementable withoit this. >> > Instead >> of stating a "need", it would IMHO make more sense to discuss the >> benefits >> of the suggested mechanism in this document of its own, independent of >> other proposals. To me, this document should be independent of other >> documents and specifically other experiments. We have to think about >> cases >> where not all experiments are successful. Then independent documents will >> be more future-proof in future. >> >> This is a naming collision… The sentence was meant to say that these >> mechanisms new more accurate ECN feedback than provided today by >> RFC3168 but it was not meant to say that these mechanism have to use the >> scheme as specified in this document. >> >> I added the following part sentence: >> >> „Recently, proposed mechanisms like Congestion Exposure (ConEx >> [RFC7713]), DCTCP [RFC8257] or L4S [I-D.ietf-tsvwg-l4s-arch] need more >> accurate ECN feedback information than provided by the feedback scheme >> as specified in [RFC3168] whenever more than one marking is received in >> one >> RTT. This document specifies an alternative feedback scheme that provides >> more accurate information and could be used by these new TCP extensions.“ >> >> Does this help? > > See my proposal for the abstract. I continue to disagree with the term > "need" but I think this can be sorted out by another term. > >> > If AccECN progresses from experimental to the standards >> > track, it is intended to be a complete replacement for classic TCP/ >> > ECN feedback, not a fork in the design of TCP. >> > >> > [ms] This sentence should be removed, as this is speculation. >> >> Why? It states an intent… and that’s the intent that we have. >> >> > >> > Until the AccECN experiment succeeds, [RFC3168] will remain as the >> > standards track specification for adding ECN to TCP. >> > >> > [ms] This sentence should be removed (or reworded) >> >> Why? Does it help to add an only here: >> >> "Until the AccECN experiment succeeds, [RFC3168] will remain as the only >> standards track specification for adding ECN to TCP.“ > > This wording is better. > >> > AccECN feedback overloads flags and fields in the main TCP header >> > with new definitions, so both ends have to support the new wire >> > protocol before it can be used. >> > >> > [ms] In my reading this experimental document asks for *new* allocation >> of a reserved TCP header flag. >> >> Is this better? >> >> "AccECN feedback overloads the two existing ECN flags as well as the >> currently reserved and previously called NS flag in the main TCP >> header >> with new definitions, so both ends have to support the new wire >> protocol >> before it can be used.“ >> >> I understand that you are not happy with the word „overload“ here but the >> point of this sentence really is that the flags can/could be used >> differently >> and therefore we need a new negotiation before we can use them. > > For me the following would work: "AccECN feedback overloads the two > existing ECN flags and > allocates the currently reserved and previously called NS flag in the main > TCP header. > Given the new definitions, both ends have to support the new wire protocol > before it can be used." > > I believe the wording has to be crystal clear on the reservation of bit 7 > when it is discussed the first time in the text. In follow-up sections, > maybe shorter terms could be used. > >> If you prefer, we can also remove the NS flag in this list, as ECN Nonce >> was >> anyway never deployed. >> >> > >> > For that we refer to [RFC3168] or any RFC that >> > specifies a different response to TCP ECN feedback, for example: >> > [RFC8257]; or the ECN experiments referred to in >> > [I-D.ietf-tsvwg-ecn-experimentation], namely: a TCP-based Low >> > Latency >> > Low Loss Scalable (L4S) congestion control >> > [I-D.ietf-tsvwg-l4s-arch]; >> > ECN-capable TCP control packets [I-D.ietf-tcpm-generalized-ecn], or >> > Alternative Backoff with ECN (ABE) >> > [I-D.ietf-tcpm-alternativebackoff-ecn]. >> > >> > [ms] At least ABE seems orthogonal. Anyway, I think this paragraph can >> > just >> be deleted. If other experiments need more accurate feedback, it is up to >> them to explain how they would use this mechanism. This document should >> focus on how to signal the feedback, not how to use that. >> >> Yes, that is what the paragraph says. Isn’t it better to be explicit >> about this? >> >> > >> > It is likely (but not required) that the AccECN protocol will be >> > implemented along with the following experimental additions to the >> > TCP-ECN protocol: ECN-capable TCP control packets and >> > retransmissions >> > [I-D.ietf-tcpm-generalized-ecn], which includes the ECN-capable SYN/ >> > ACK experiment [RFC5562]; and testing receiver non-compliance >> > [I-D.moncaster-tcpm-rcv-cheat]. >> > >> > [ms] I am a big fan of simple, standalone documents. In my view, the >> > TCPM >> working group should publish draft-ietf-tcpm-accurate-ecn and draft-ietf- >> tcpm-generalized-ecn independent documents, which probably implies that >> draft-ietf-tcpm-generalized-ecn does not use AccECN. If experimentation >> with ECT in SYN requires a combination, this could be done in a new, >> third >> document. Apart from having simpler focused documents, this could >> significantly help later with moving forward documents to standards >> track. >> >> I disagree, however, this is a discussion to have on draft-ietf-tcpm- >> generalized-ecn. I don’t see a problem in providing a reference here >> that >> says „it is likely…“ and nothing more. >> > >> > >> > >> > * 1.1. Document Roadmap >> > >> > [ms] A macroscopic comment is that this document has a lot of >> > introduction >> and tutorial text with lot's of redundancy towards other documents. I >> think >> the document can be made much easier to read by shorten it. In many cases >> this is just an editorial change as there is redundancy. As one such >> example, >> just remove this section. >> >> I guess this a matter of taste. As an AD, I’m a big fan of short and >> concise >> documents, however, some redundancy can also help understanding, >> especially if you explain things multiple times but with a different >> level of >> detail. I personally would not need the roadmap but I know many people >> who find these things helpful and to be honest I don’t see how removing >> this >> part makes the doc any better. If you don’t want it, don’t read it. >> >> > >> > >> > * 1.2. Goals >> > >> > [ms] I think this section can also just be removed. >> >> I have to say I also don’t see the point of removing this part. Given we’ve >> done the work on requirements, I think we should also link to this doc >> somewhere. >> > >> > >> > * 1.3. Experiment Goals >> > >> > TCP is critical to the robust functioning of the Internet, therefore >> > any proposed modifications to TCP need to be thoroughly tested. The >> > present specification describes an experimental protocol that adds >> > more accurate ECN feedback to the TCP protocol. The intention is to >> > specify the protocol sufficiently so that more than one >> > implementation can be built in order to test its function, >> > robustness >> > and interoperability (with itself and with previous version of ECN >> > and TCP). >> > >> > [ms] I think all what is written in this paragraph is obvious, no? >> > Can't we just >> delete this? >> >> Sure, however, I don’t think it hurts to spell it out. For me both is >> fine, keep it >> or remove it. >> >> > >> > The experimental protocol will be considered successful if it is >> > deployed and if it satisfies the requirements of [RFC7560] in the >> > consensus opinion of the IETF tcpm working group. In short, this >> > requires that it improves the accuracy and timeliness of TCP's ECN >> > feedback, as claimed in Section 5, while striking a balance between >> > the conflicting requirements of resilience, integrity and >> > minimisation of overhead. It also requires that it is not unduly >> > complex, and that it is compatible with prevalent equipment >> > behaviours in the current Internet (e.g. hardware offloading and >> > middleboxes), whether or not they comply with standards. >> > >> > Testing will mostly focus on fall-back strategies in case of >> > middlebox interference. Current recommended strategies are >> > specified >> > in Sections 3.1.2, 3.2.3, 3.2.4 and 3.2.7. The effectiveness of >> > these strategies depends on the actual deployment situation of >> > middleboxes. Therefore experimental verification to confirm large- >> > scale path traversal in the Internet is needed before finalizing >> > this >> > specification on the Standards Track. >> > >> > [ms] These two paragraphs must be entirely rewritten. As I have >> mentioned before, I don't think an RFC should speculate about TCPM and >> its >> consensus opinion. I would suggest a wording along the lines of: >> > >> > >> > The experimental protocol will be considered successful if >> > testing confirms that the proposed mechanism can be deployed at >> > large >> scale. >> > Testing will mostly focus on fall-back strategies in case of >> > middlebox interference. Current recommended strategies are >> > specified >> > in Sections 3.1.2, 3.2.3, 3.2.4 and 3.2.7. The effectiveness of >> > these strategies depends on the actual deployment situation of >> > middleboxes. Therefore experimental verification to confirm large- >> > scale path traversal in the Internet is needed, e.g., by support in >> > major TCP stacks. >> > >> > >> I don’t understand your point here. I don’t think that the paraphrase >> speculates about the consensus of tcpm, in contrast it say tcpm has to >> decided if the requirements previously specified by tcpm are sufficiently >> fulfilled. I don’t see a reason to not mention the requirement draft as >> this >> draft as tcpm consensus and was written for this purpose. > > My suggested wording uses the expression "can be deployed at large scale" > and I believe this is relevant. > > The document already describes in Section 5 how the protocol satisfies the > agreed requirements for a more accurate ECN feedback protocol [RFC7560]. > So, if the TCPM working group publishes this document with the content of > Section 5, I believe the TCPM working group already has reached consensus > that the protocol meets requirements. In addition, it is possible that new > requirements would be identified in future, e.g., as an outcome of the > experiment, and that would obviously have to be considered by TCPM. In > that case, for the success of the experiment not only RFC 7560 would > matter, but also further requirements. My proposed wording does not have > all these problems. > > In a nutshell, I continue to believe that this section has to change. > >> > * 1.5. Recap of Existing ECN feedback in IP/TCP >> > >> > [ms] This section could probably be shortened as well. >> > >> > The last bit in byte 13 of the TCP header was defined as the Nonce >> > Sum (NS) for the ECN Nonce [RFC3540]. RFC 3540 was never deployed >> > so >> > it is being reclassified as historic, making this TCP flag available >> > for use by the AccECN experiment instead. >> > >> > [ms] This wording, as well as Figure 1, needs to take into account the >> > IANA >> status when draft-ietf-tsvwg-ecn-experimentation is published. >> >> Is does. However, I can explicitly say that is has be re-clssified as >> reserved. >> >> "RFC 3540 was never deployed so it is being reclassified as historic >> [I-D.ietf- >> tsvwg-ecn-experimentation] and the respective flag has been marked as >> „reserved“ in the IANA TCP Header Flags registry, making this TCP flag >> available for use by the AccECN experiment instead.“ >> >> Better? >> >> > In my understanding, this experimental document asks for new assignment >> of a reserved TCP header flag. >> >> As I said I’m not sure if we have fully concluded this discussion yet. >> However, >> what we really would want to is mention somewhere that this experiment >> with this flags is running. I guess there are three options: >> 1) keep it in the registry as reserved and conserve the knowledge in tcpm >> that this experiment is running and no other experimental RFC such use >> this >> flags as long as this experiment is running. >> 2) Keep is marked as reserved but add a note about this experiment in the >> IANA registry >> 3) Or assign it right away with IESG approval. I guess in this case tcpm >> could >> also consider to change the registration policy to „IETF Review“. > > The current registration policy for the TCP header flags is "standards > action". I understand that the IESG could approve exceptions. But given > the policy, I believe the document has to be very precise on the request > regarding bit 7. > >> > * 2. AccECN Protocol Overview and Rationale >> > >> > o an essential part that re-uses ECN TCP header bits to feed back >> > the number of arriving CE marked packets. This provides more >> > accuracy than classic ECN feedback, but limited resilience >> > against >> > ACK loss; >> > >> > [ms] The word "re-use" is IMHO not correct. >> >> I think this is nit picking. Using a different phrasing here makes the >> sentence >> unnecessary complicated. We don’t try to some how get a round the fact >> that we need to handle the flag registration correctly. However, here the >> point really is to explain how the protocol word. The main point of using >> the >> work „re-use“ here is really that we say that these flags are or have >> been >> used different by other TCP extension (and we therefore need a proper >> negotiation scheme). > > If the allocation of a reserved flag is correctly explained in the > abstract and introduction, I think these sentences can use a bit relaxed > terminology. > >> > The two part design was necessary, given limitations on the space >> > available for TCP options and given the possibility that certain >> > incorrectly designed middleboxes prevent TCP using any new options. >> > >> > [ms] IMHO it would make sense to more explicitly mention the downsides >> of only specifying an option and not allocating a TCP header flag, in >> this >> experimental document. >> >> We need to use the flags (all three of them) for the negotiation. > > I think that an explanation why negotiation by a TCP option would not > solve all use cases (or requirements) would help here. > >> > The obvious alternative would be to postpone the header flag >> > allocation to >> a follow-up standards track document and just keep it reserved. >> >> We can still do that. We should discuss and make a final decision. >> >> > >> > The essential part overloads the previous definition of the three >> > flags in the TCP header that had been assigned for use by ECN. This >> > design choice deliberately replaces the classic ECN feedback >> > protocol, rather than leaving classic ECN feedback intact and adding >> > more accurate feedback separately because: >> > >> > [ms] Similar like previous comments, in my reading there are only _two_ >> ECN header flags. >> >> I think there are three flags that "had been assigned for use by ECN“ as >> ECN >> Nonce is also an ECN mechanism. The fact that one of the flags is now >> marked as reserved instead, it not that important for me here. >> >> > And, in addition, I think care is needed with wording such "replaces >> > the >> classic ECN feedback". I don't think this experiment replaces the ECN >> standards. That would be up to a follow-up PS. >> >> This sentence is not meant to say that RFC3168 is replaced. Actually we >> don’t. >> You can still use RFC3168 even if AccECN is implemented and deploy >> (however, we do intent that AccECN will be used as the default scheme in >> future and RFC3168 is hopefully simply not needed anymore at some point, >> even though you probably still need to have it implemented as the >> negotiation specified in this draft covers that as well, anyway...). The >> sentence says that if AccECN is negotiation, the header flags as used by >> RFC3168 and previously ECN Nonce are used differently (aka re-used). That’s >> all. >> > >> > >> > 2.1. Capability Negotiation >> > >> > AccECN is a change to the wire protocol of the main TCP header, >> > therefore it can only be used if both endpoints have been upgraded >> > to >> > understand it. The TCP client signals support for AccECN on the >> > initial SYN of a connection and the TCP server signals whether it >> > supports AccECN on the SYN/ACK. The TCP flags on the SYN that the >> > client uses to signal AccECN support have been carefully chosen so >> > that a TCP server will interpret them as a request to support the >> > most recent variant of ECN feedback that it supports. Then the >> > client falls back to the same variant of ECN feedback. >> > >> > [ms] As this is an experimental specification, I would really like to >> > see a >> discussion how a future standards track version of more accurate ECN >> could >> be negotiated. >> >> As described in this draft. There will be no different. AccECN IS and >> will >> always be backward compatible with RFC3168. > > That is not the problem I think about. I wonder about a PS version of > accurate ECN feedback that would possibly include changes as compared to > this experiment, e.g., because the experiment may have some lessons > learnt. What options would we have to negotiate the PS version, and how > could a stack implementing the PS version figure out whether the remote > end uses the experimental or the PS version of the protocol? > > The reason why I ask is because I don't see any easy solution to this but > I may miss something. Maybe this would not be a concern if there were some > codepoints left. > >> > How could both endpoints detect whether the other one implements the >> future standards track version? >> >> If the initiator implements AccECN it will request it’s use. If the >> receiver also >> implement it, it will/can negotiate it, if not it will look like an >> RFC3168 request >> for the receiver (as the NS flags will be ignored in the SYN) and it will >> negotiate RFC3168 ECN feedback if implemented. There is no additional >> detection needed. > > My concern is the migration strategy for a future version, given that we > only experiment right now. For instance, if the initiator implements the > experimental version but the recipient implements the PS version of > AccECN, how would that work? Under the assumption that there are changes, > would there be a way to know? Maybe the answer to this question is no, > given the small number of bits we have. But not having any room for > extensions is not necessarily good protocol design. > >> > For instance, would the only safe variant be that we allocate yet >> > another >> reserved TCP header flag in a proposed standard to negotiate the >> standards >> track version, thus investing another reserved bit in the TCP header? >> >> No, that’s exactly what we use the NS flags for in the handshake. > > If the PS version of AccECN was different to the experimental version of > AccECN, and if there was a deployed base of both, I still believe we could > end up in a situation in which we had to allocate yet another TCP header > flag to distinguish the different versions of AccECN. The NS flag would > not work for that if it is used by the experimental version. The risk of > having to spend further TCP header flags somehow concerns me. Of course, > that problem would only matter if the AccECN experiment succeeds somehow, > but lessons learnt would require protocol changes, which is speculation. > >> > I may be wrong, but to me it is too early to speculate how the PS >> > version >> would look like, and whether it would have to be different to the >> experimental version, due to lessons learnt. >> >> Of course you can always be wrong. However, the handshake negotiation is >> not the part we need experimentation for. That part is straight forward >> and >> works. If we really happen to detect a problem in that part, we would >> need >> to end the experiment declare failure and start over new. > > My concern is ending the experiment when the experiment got (partly) > deployed in the Internet. In that case neither a new RFC nor a change of > the IANA registry will solve the migration issue. > >> > I believe in the IETF we typically design protocols that allow future >> extension, and it is not exactly clear to be how AccECN could be extended >> later. >> >> This is an TCP extension. If we want future extension we use the usually >> TCP >> mechanism (by defining a new TCP option I guess). > > The root cause of my concern is that this proposal does *not* use the > usual way to experiment with TCP by options. It experiments with a header > flag, including in the SYN, and it seems to consume all codepoints. So, I > see the risk of a protocol design "not ready for future improvements". > > I cannot easily propose text. Maybe "lack of extensibility" is just one of > the short-comings of the protocol design that cannot be avoided but that > short-coming would have to be noted. > >> > An AccECN TCP client does not send the new AccECN Option on the SYN >> > as SYN option space is limited and successful negotiation using the >> > flags in the main header is taken as sufficient evidence that both >> > ends also support the AccECN Option. The TCP server sends the >> > AccECN >> > Option on the SYN/ACK and the client sends it on the first ACK to >> > test whether the network path forwards the option correctly. >> > >> > [ms] For what it is worth, I would personally be quite fine with >> > allowing (or >> even mandating) an option in the SYN in the experimental version of this >> protocol. For instance, saving the SYN option space would then an >> excellent >> reason for moving towards the PS specification. I am also fine with being >> in >> the rough part of the consensus here. >> >> The point is that we really don’t need the option in the SYN as we don’t >> use it >> for negotiation purposes as we use the header bits instead. So why should >> we waste the space? > > For instance, mandating the option in the SYN would be away for the > receiver to distinguish the experiment from a follow-up PS version of the > spec, as the PS version may not mandate the option, to save header space. > > Maybe that proposal does not make any sense, and it may only have > downsides. But the document already speculates about a PS-follow-up. So it > seems a valid question to ask if the EXP and the PS version of the spec > have to be identical. This all comes down to the SYN negotiation. > >> > * 2.3. Delayed ACKs and Resilience Against ACK Loss >> > >> > If the AccECN Option is not available, e.g. it is being stripped by >> > a >> > middlebox, the AccECN protocol will only feed back information on CE >> > markings (using the ACE field). Although not ideal, this will be >> > sufficient, because it is envisaged that neither ECT(0) nor ECT(1) >> > will ever indicate more severe congestion than CE, even though >> > future >> > uses for ECT(0) or ECT(1) are still unclear >> > [I-D.ietf-tsvwg-ecn-experimentation]. >> > >> > [ms] This needs to be reworded >> >> Why? >> >> > >> > >> > >> > * 2.4. Feedback Metrics >> > >> > The CE packet counter in the ACE field and the CE byte counter in >> > the >> > AccECN Option both provide feedback on received CE-marks. The CE >> > packet counter includes control packets that do not have payload >> > data, while the CE byte counter solely includes marked payload >> > bytes. >> > If both are present, the byte counter in the option will provide the >> > more accurate information needed for modern congestion control and >> > policing schemes, such as DCTCP or ConEx. >> > >> > [ms] I suggest to write in the last sentence only "... the option will >> > provide >> the more accurate information needed for congestion control". In general, >> I >> would prefer to have references to other mechanisms at only few (ideally >> a >> *single*) places in the document, instead of mixing them together. >> >> Sorry, I don’t see your point here. ConEx has been mentioned previously, >> so >> why not also mention it here. > > As written earlier, in my understanding DCTCP does not "need" this. I > would suggest to have one place where to define exactly how this mechanism > can be used by other TCP extensions. Having said this, in this specific > paragraph I am less concerned about that than elsewhere. > >> > Feedback in bytes is recommended in order to protect against the >> > receiver using attacks similar to 'ACK-Division' to artificially >> > inflate the congestion window, which is why [RFC5681] now recommends >> > that TCP counts acknowledged bytes not packets. >> > >> > [ms] At least the last part and the reference to RFC 5681 is IMHO not >> needed here. >> >> Why? RFC5681 explains/refers the ACK division attack, so I think it is a >> very >> good reference to have here. >> > >> > >> > >> > * 2.5. Generic (Dumb) Reflector >> > >> > The ACE field provides information about CE markings on both data >> > and >> > control packets. According to [RFC3168] the Data Sender is meant to >> > set control packets to Not-ECT. However, mechanisms in certain >> > private networks (e.g. data centres) set control packets to be ECN >> > capable because they are precisely the packets that performance >> > depends on most. >> > >> > For this reason, AccECN is designed to be a generic reflector of >> > whatever ECN markings it sees, whether or not they are compliant >> > with >> > a current standard. Then as standards evolve, Data Senders can >> > upgrade unilaterally without any need for receivers to upgrade too. >> > It is also useful to be able to rely on generic reflection behaviour >> > when senders need to test for unexpected interference with markings >> > (for instance [I-D.kuehlewind-tcpm-ecn-fallback] and >> > [I-D.moncaster-tcpm-rcv-cheat]). >> > >> > The initial SYN is the most critical control packet, so AccECN >> > provides feedback on whether it is CE marked. Although RFC 3168 >> > prohibits an ECN-capable SYN, providing feedback of CE marking on >> > the >> > SYN supports future scenarios in which SYNs might be ECN-enabled >> > (without prejudging whether they ought to be). For instance, >> > [I-D.ietf-tsvwg-ecn-experimentation] updates this aspect of RFC 3168 >> > to allow experimentation with ECN-capable TCP control packets. >> > >> > [ms] To me, the only thing that matters in this document that AccECN >> > can >> provide feedback on whether the SYN is CE marked. The discussion on how >> to experiment with ECT e.g. in SYNs IMHO does not belong into this >> document. So it seems sufficient here to note that one of the benefits of >> AccECN is that CE marks in SYNs can be fed back. >> >> I disagree. Explicitly saying that AccECN is only an feedback scheme and >> DOES >> NOT define how the information is used is VERY important because people >> come back to me over and over again and mix these things up. >> > >> > >> > * 3.1.1. Negotiation during the TCP handshake >> > >> > Given the ECN Nonce [RFC3540] is being reclassified as historic, the >> > present specification renames the TCP flag at bit 7 of the TCP >> > header >> > flags from NS (Nonce Sum) to AE (Accurate ECN) (see IANA >> > Considerations in Section 6). >> > >> > [ms] As mentioned before, this needs to be rewritten to ask for new >> > IANA >> allocation of bit 7 in the TCP header flags. >> >> I really don’t understand this comment. That is what the IANA section >> does >> as referred here correctly. > > In my reading of > https://www.iana.org/assignments/tcp-header-flags/tcp-header-flags.xhtml, > this flag currently has no name, i.e., it does not have the name NS. So > this statement on "renaming" is formally incorrect IMHO. > > I'd suggest something like: "This specification assigns the name AE > (Accurate ECN) to the TCP flag at bit 7; this flag has previously been > known as NS (Nonce Sum) ...". > >> Again, yes, we can discuss if this document should do this, but if >> published as >> it is, section 6 says everything that is needs to say. (I does not put >> any >> request on IANA, instead it is written as it would show up >> post-publication, >> implicitly providing a request to IANA at approval time. That is fine.) >> >> > >> > Table 2: ECN capability negotiation between Client (A) and Server >> > (B) >> > >> > [ms] As far as I can see, in -05 this table allocates all existing >> > codepoints, >> while -03 had two currently unused codepoints. Not having any codepoints >> left seems to me not really future proof, e.g., regarding future proposed >> standards in this space (and I personally believe that TCP header flags >> must >> be allocated in a PS). And I don't fully see a need of feeding back ECT0 >> and >> specifically ECT1 in the TCP header flags as part of the experiment. Do >> we >> know for sure that this is the only possible use case of these two >> unallocated >> header bits? And why can't e.g. this be done in a TCP option instead? Or >> do I >> miss something? >> >> The point is really, if we don’t assign them now and start deployment we >> effetely we not be able to every assign them again because don’t have a >> different negotiation mechanisms. Realizing this, it is just the right >> think to >> define the space completely that is negotiated as use for AccECN in the >> handshake. > > I disagree that consuming all codepoints and not having room for future > extensions is the "right thing" to do. It is in fact the wrong thing. But > possibly there is no alternative with the few bits, so maybe we end up > doing it. > > Yet, at minimum, using all codepoints needs to be reasoned in the > document. Specifically since in -03 a different protocol design seemed > possible, which looked to me more future-proof. > >> > * 3.1.2. Retransmission of the SYN >> > >> > However, >> > current measurements imply that a drop is less likely to be due to >> > middlebox interference than other intermittent causes of loss, e.g. >> > congestion, wireless interference, etc. >> > >> > [ms] Such wording IMHO doesn't belong into normative text. This may >> actually also apply to other heuristics discussed in this section, which >> are not >> really important for interoperability. >> >> I don’t really understand your point. This sentence is solely meant to >> reason >> the design decision to not say that a sender SHOULD attempt to re- >> negotiation after a loss. > > One could split the reasoning from the normative design. The normative > specification may still be relevant in 20 years from now. Middleboxes will > almost likely be different in 20 years. Having said this, this is more of > an editorial remark. > >> > 3.2.7. Path Traversal of the AccECN Option >> > >> > 3.2.7.1. Testing the AccECN Option during the Handshake >> > >> > The TCP client MUST NOT include the AccECN TCP Option on the SYN. >> > >> > [ms] I am not sure if I really understand the motivation for not >> > allowing a >> option in the SYN. If the sender has space in the SYN left, what is the >> harm in >> an experimental version of the protocol? And I may miss something, but >> what would prevent the use of 2-byte option to negotiate the use of >> AccECN, e.g., to avoid experimental allocation of bit 7 in the initial >> SYN? >> >> I did have a draft on that as a proposal for an alternative design. >> However, >> the gourd was more supportive of this design as it is proof of middlebox >> SYN >> option mangling which is a know problem. >> >> Therefore we simply don’t need option in the SYN and there is no reason >> to >> waste the space. >> >> > While I think many tutorial text in this document could be shortened, I >> believe the use of a reserved TCP header flag should be reasoned. >> >> I’m actually uncertain what you expect here. > > For instance, this reply with the explanation of SYN option mangling seems > useful explanation. > >> > * 3.2.8. Usage of the AccECN TCP Option >> > >> > The following rules determine when a Data Receiver in AccECN mode >> > sends the AccECN TCP Option, and which fields to include: >> > >> > Change-Triggered ACKs: If an arriving packet increments a different >> > byte counter to that incremented by the previous packet, the Data >> > Receiver MUST immediately send an ACK with an AccECN Option, >> > without waiting for the next delayed ACK (this is in addition to >> > the safety recommendation in Section 3.2.5 against ambiguity of >> > the ACE field). >> > >> > This is stated as a "MUST" so that the data sender can rely on >> > change-triggered ACKs to detect transitions right from the very >> > start of a flow, without first having to detect whether the >> > receiver complies. A concern has been raised that certain >> > offload >> > hardware needed for high performance might not be able to support >> > change-triggered ACKs, although high performance protocols such >> > as >> > DCTCP successfully use change-triggered ACKs. >> > >> > [ms] To me this sounds like a perfect example for a SHOULD with >> > additional >> guidance why implementing this SHOULD is really important. >> >> This is one of the most discussed point from the author and we really >> tried to >> get additional guidance here of what to do also from outside the IETF but >> did >> no clear feedback. >> >> As explained this MUST enables additional functionality. However, this is >> an >> experiment document. If we detect that this MUST does actually hinder >> implementation or has just never been implemented, we should reconsider >> this in the final PS RFC. >> >> I was on the SHOULD side of the discussion, but can say that the >> implementation in Linux was way more simple then expected. Offloading >> might be a different topic but that is where I could not get a clear >> feedback >> and offloading could probably be anyway optimized for use with AccECN (if >> it >> gets deploy widely). > > If a MUST requires changes in hardware, I think there must be a clear > reason. > > As individual contributor, with the current explanation in the text, I > believe this has to be a SHOULD. > >> I though we added this as something to mention in the exp goals section, >> but >> obviously we didn’t. I added the following text now: >> >> "Another experimentation focus is the implementation feasibiliy of >> change- >> triggered ACKs as described in section 3.2.8. While on average this >> should not >> lead to a higher ACK rate, it changes the ACK patter which especially can >> have >> an impact on hardware offload. Further experimentation is needed to >> advise >> if this should a hard requirement or just prefer behavior.“ > > If it is unclear if a MUST can actually be implemented, having a MUST is > in my opinion the wrong approach. > > One could equally state here that further experimentation is needed to > determine whether the SHOULD can be upgraded to a MUST. > >> > For the avoidance of doubt, the change-triggered ACK mechanism is >> > deliberately worded to ignore the arrival of a control packet with >> > no >> > payload, which therefore does not alter any byte counters, because >> > it >> > is important that TCP does not acknowledge pure ACKs. The change- >> > triggered ACK approach will lead to some additional ACKs but it >> > feeds >> > back the timing and the order in which ECN marks are received with >> > minimal additional complexity. >> > >> > [ms] The additional acks create network load. I think some wording is >> needed on the tradeoff between information accuracy and network load. >> There are network environments in which any additional packet is very >> expensive (e.g., energy) and it is not clear to me how the protocol >> design >> takes into account the potential overhead of additional ACKs. Maybe this >> could be another reason for a SHOULD. >> >> The above. However, this is not really an additional ACK because you do >> delay the next one. Further experimentation needed. > > The document states "lead to some additional ACKs". If that does not > increase network load, I think it has to be explicitly explained why the > ACK load is at most equal to a current TCP stack, in all potential cases. > If it can increases network load, it has to be reasoned why increasing > load (and risk of reverse congestion and the like) is worth the effort. > > I agree that this may be an area of experimentation, but I believe then it > has to be explained to implementers what the tradeoffs are. > >> > * 4.2. Compatibility with Other TCP Options and Experiments >> > >> > AccECN is compatible (at least on paper) with the most commonly used >> > TCP options: MSS, time-stamp, window scaling, SACK and TCP-AO. It >> > is >> > also compatible with the recent promising experimental TCP options >> > TCP Fast Open (TFO [RFC7413]) and Multipath TCP (MPTCP [RFC6824]). >> > >> > [ms] I would suggest the wording "... compatible with the experimental >> TCP options ..." or even "... compatible with the TCP options …". >> >> These option are to experimental..? > > "It is also compatible with the experimental TCP options TCP Fast Open > (TFO [RFC7413]) and Multipath TCP (MPTCP [RFC6824])." would have same > technical meaning. Having said this, this is editorial only. > >> The point of using „commonly used“ was to say that we checked on those as >> they seem important. Just because your favorite experiment option is not >> listed here it doesn’t means it incompatible, we just didn’t check. I’m >> okay to >> removed „commonly used“ but I don’t think it makes anything better. >> >> > >> > * 4.3. Compatibility with Feedback Integrity Mechanisms >> > >> > [ms] Quite a bit in this section is experimental work, which IMHO >> > should be clearly emphasized. The one exception is… >> >> I would really like to keep this section because integrity is usually the >> fist >> question that come up when I present AccECN. Effectively these are two >> independent topics, however, I really think it help people to understand >> the >> whole picture if this is also discussed in this document. >> >> > >> > However, TCP-AO is often too brittle to use on many end-to-end >> > paths, where middleboxes can make verification fail in their >> > attempts to improve performance or security, e.g. by >> > resegmentation or shifting the sequence space. >> > >> > [ms] I am not sure if deployment challenges of other options need to be >> discussed in this document. >> >> If we keep the discussion, I guess we should mention this as well. As the >> doc >> clearly stated section 4 is not meant to be normative. > > As far as I can see, there are use cases for TCP-AO where middleboxes are > simply not a problem, but it is exactly this sort of discussion that may > not be needed in this document. But I won't rat-hole on this comment here. > >> > Originally the ECN Nonce [RFC3540] was proposed to ensure integrity >> > of congestion feedback. With minor changes AccECN could be >> > optimised >> > for the possibility that the ECT(1) codepoint might be used as an >> > ECN >> > Nonce . However, given RFC 3540 is being reclassified as historic, >> > the AccECN design has been generalised so that it ought to be able >> > to >> > support other possible uses of the ECT(1) codepoint, such as a lower >> > severity or a more instant congestion signal than CE. >> > >> > [ms] The discussion of RFC 3540 can probably be removed to a large >> > extent. >> >> Unfortunately, please still think that ECN Nonce, even though is was >> never >> deployed and doesn’t really work, is the only was to provide integrity >> protection and we need it as a prerequisite to deploy ECN at all… i would >> really prefer to keep this in this non-normative part of the doc. >> >> > >> > >> > * 6. IANA Considerations >> > >> > [ms] I think this section needs to be rewritten to request a new >> > allocation >> of bit 7 of the TCP header flags. At least for the process I think it >> would make >> sense to have somewhere in the document a comprehensive explanation of >> why an experimental document requests a change of the main TCP header, >> and why this cannot be avoided (most notably in the initial SYN) by an >> alternative protocol design. >> >> As I said previously this section is written as it would look like after >> the >> allocation has happened with publication approval of the IESG. This is >> fine. >> >> Having a discussion about an experiment doc assigning a flag (or not) is >> a >> question for tcpm as a whole and not specifically this document. How do >> we >> envision to every use any further flags? We go to PS right away? Or >> should >> we change the registration policy? For me the latter makes actually more >> sense. However, if we don’t want/can to decide this now, we also could go >> forward as it is with IESG approval. However, is this case it is also not >> needed >> to explain this in the document. The responsible AD has to explain this >> to the >> other IESG probably in the ballot or even better the shepherd could >> provide >> these information in the write-up. >> >> > >> > >> > * 9. Comments Solicited >> > >> > Comments and questions are encouraged and very welcome. They can >> be >> > addressed to the IETF TCP maintenance and minor modifications >> > working >> > group mailing list , and/or to the authors. >> > >> > [ms] This section is not needed IMHO >> >> Yes, it will be removed before publication. >> > >> > >> > 10. References >> > >> > [I-D.ietf-tsvwg-ecn-experimentation] >> > Black, D., "Relaxing Restrictions on Explicit Congestion >> > Notification (ECN) Experimentation", >> > draft-ietf-tsvwg-ecn- >> > experimentation-07 (work in progress), October 2017. >> > >> > [ms] Normative reference? >> >> Don’t see why. No need to read ietf-tsvwg-ecn-experimentation to >> understand the spec in this doc. >> >> Thanks! >> Mirja >> > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm > > > --- > This email has been checked for viruses by AVG. > http://www.avg.com > From nobody Mon Mar 19 08:41:34 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 46EDA12D574; Mon, 19 Mar 2018 08:41:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.18 X-Spam-Level: X-Spam-Status: No, score=-2.18 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, STOX_REPLY_TYPE=0.439, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7ob6l8rq0U6D; Mon, 19 Mar 2018 08:41:31 -0700 (PDT) Received: from mout.gmx.net (mout.gmx.net [212.227.17.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 93609129C6B; Mon, 19 Mar 2018 08:41:30 -0700 (PDT) Received: from srichardlxp2 ([213.143.121.76]) by mail.gmx.com (mrgmx102 [212.227.17.168]) with ESMTPSA (Nemesis) id 0MWQSM-1f8KvG21dK-00XfNz; Mon, 19 Mar 2018 16:41:24 +0100 Message-ID: <31CCB8D4D5D645849D5804DFB17FD030@srichardlxp2> From: "Richard Scheffenegger" To: "Michael Welzl" Cc: "Michael Tuexen" , , References: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> <23187136694049B3BEA2C7FAD794E280@srichardlxp2> Date: Mon, 19 Mar 2018 16:31:35 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="UTF-8"; reply-type=original Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 X-Provags-ID: V03:K0:ZscBVSaj22cKV6UV+tllwov3rSZNf+3foinVDbDqWz0spkSUZwk iZslhfFHrP+MFEiavFzEZ3++gXpek+E+IwgWwLpoJaX2q7o0cBUi0F0xsNzmSOCoEPkxSRk CrXL363ZZ6pZBS9wc35yZg09J7Qpf3RXWDiWdqjynuKIU2JsBM9IWJpJa7BzboYeK2kmpEx fDLCrJUaw4vfMl6+Zd4fA== X-UI-Out-Filterresults: notjunk:1;V01:K0:RvLqD1Z6Qic=:SDBUycvs+f9j03KfJUKwuD chU9lKF6w9HICcZz0+6G3kKvsOw70LSjoPy1Kof3mwp4NonlNy0ErPulpQn3sE3YXni1YjVBF XSFxtNFyvX7MvE9qgfyyVxDD8uF2doLrk6ovnVM45cCWCBuEkzHMb6hcIDQJHMDpFg9xHPDJc GdYu5E2LjvnFoy9GEidA5rUCNO/ruvKnbbMGML26qo3hIlGLYSgRmJe66sbrCSteoX9YpNgar n7Vja+ereNK+3VSIGCCRN6onjq4vb/FLLOna6gtVKMYcXmOHG57TDIVN+XWfSOJ56wHCr+c9K /bTIemyg2XP/XAqUi+ihJzmzzqwZCbkKIYwtffARG+0YOjWr/ROW7ZuqYdKy0miiqHaSl6lGe z1S/h9wdRd66yTkNzdS6piwHf+SWLsZq35eQVWrqqRktY7qPKhYTYW6k2VGmHyXeQwrZs6VWy ixF/BALyyddsSqRddDTxGO7fbQIPTbKa0A8tVML7HPABi5Ab53rcVnIMvbUeNYq7N/lF+r0Yi +M9DHAUweiT6kxZZLrS0wXkF0VTJvoyd7cZT1HIPYDnUxKupVP4eVo/9ZcGHKyJ8YdtrHTSzM O/HDu9nd+8s4aQ8iDp70cBWNBi6PDucHmXJOSHZ4YvUm2Fk24KNxEP+yofikIRaiIYOLsJ755 YbLrtiH18DKwO2cLiGt/NrDBKCd9zCHD3JBJvOzyfAIkNKSh18bhohWn1grcp9Hwrjw8LOAEK 3kV9LQvv64q7Uwr3VNYkXGNTGkSYpdfwYC/YCZuu6KBc7SDqOKEzI2/C3OdwFkBrPD8w28Y69 sSO3J96pAvZpxYEvSeaFFNNKnGXEz31eBEp+RE+aIBNuKxCJqQ= Archived-At: Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Mar 2018 15:41:33 -0000 Hi Michael, Just thinking that the difference between loss vs. ECN cwn reduction might be defined as a relative value of each other, rather than an absolute; In my example, Cubic on FreeBSD used beta 0.8, while Cubic Linux uses 0.7; with the research showing a sensible Cubic ECN reaction on Linux being 0.85, correct? (~50% closer to 1). So when using Cubic w/ beta 0.8 (as FreeBSD), would a sensible value for Cubic ECN there a value of 0.9? Best regards, Richard ----- Original Message ----- From: "Michael Welzl" To: "Richard Scheffenegger" Cc: "Michael Tuexen" ; ; Sent: Tuesday, March 13, 2018 6:25 PM Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 Hi, > On Mar 1, 2018, at 11:13 AM, Richard Scheffenegger wrote: > > Hi, > > Some of the I-D references are already RFCs; > > Reading the FreeBSD modular cubic code, using a beta value of 0.8 (vs. 0.7 > reportedy in Linux), I'm wondering if some generic rules-of-thumb, as to > what a reasonable beta_loss vs. beta_ecn adjustment would be in this RFC > might be in order (although I agree, that CCs should come up with > reasonable guidance there). Yes, we found the choice of value to depend on the algorithm. > Other than this, I like this draft, as it also gives some additional > incouragement to deploy ECN. Thanks - we hope so too! Cheers, Michael PS: When I just tried to answer this email with reply-to-all, my Apple Mail client offered the alias: "tcpm-chairs@ietf.org" which it had stored as an address, as a result of the previous conversation. To avoid continuing the nonsense of wrongly sending to the list instead of the chairs in the future as this alias gets stored in email clients, I recommend that folks check this address carefully when sending replies. Although, maybe don’t: it would be kind of funny to see these things happen more often :-) this certainly gave me a good laugh today. --- This email has been checked for viruses by AVG. http://www.avg.com From nobody Mon Mar 19 09:05:07 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 383E712D80E; Mon, 19 Mar 2018 09:05:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.91 X-Spam-Level: X-Spam-Status: No, score=-2.91 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=-1, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=nokia.onmicrosoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost 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Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3254E12D874 for ; Mon, 19 Mar 2018 09:34:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.209 X-Spam-Level: X-Spam-Status: No, score=-4.209 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lkbQUEdeew19 for ; Mon, 19 Mar 2018 09:34:11 -0700 (PDT) Received: from mail-out01.uio.no (mail-out01.uio.no [IPv6:2001:700:100:10::50]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BFCE612D7FC for ; Mon, 19 Mar 2018 09:34:11 -0700 (PDT) Received: from mail-mx04.uio.no ([129.240.10.25]) by mail-out01.uio.no with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1exxjd-00059P-7Y; Mon, 19 Mar 2018 17:34:09 +0100 Received: from dhcp-82c4.meeting.ietf.org ([31.133.130.196]) by mail-mx04.uio.no with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) user michawe (Exim 4.90_1) (envelope-from ) id 1exxjc-000CrB-Gj; Mon, 19 Mar 2018 17:34:09 +0100 Content-Type: multipart/alternative; boundary="Apple-Mail=_6A258F7F-E629-47FD-9D18-E8D904F5F5AD" Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) From: Michael Welzl X-Priority: 3 In-Reply-To: <31CCB8D4D5D645849D5804DFB17FD030@srichardlxp2> Date: Mon, 19 Mar 2018 16:34:07 +0000 Cc: tcpm@ietf.org Message-Id: <2945F9B8-60FA-49E4-86AC-36E2C331CE85@ifi.uio.no> References: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> <23187136694049B3BEA2C7FAD794E280@srichardlxp2> <31CCB8D4D5D645849D5804DFB17FD030@srichardlxp2> To: Richard Scheffenegger X-Mailer: Apple Mail (2.3273) X-UiO-SPF-Received: Received-SPF: neutral (mail-mx04.uio.no: 31.133.130.196 is neither permitted nor denied by domain of ifi.uio.no) client-ip=31.133.130.196; envelope-from=michawe@ifi.uio.no; helo=dhcp-82c4.meeting.ietf.org; X-UiO-Spam-info: not spam, SpamAssassin (score=-5.0, required=5.0, autolearn=disabled, AWL=0.015, HTML_MESSAGE=0.001, UIO_MAIL_IS_INTERNAL=-5, uiobl=NO, uiouri=NO) X-UiO-Scanned: EBBA00702A360B187442739D7C862B434AFE4B62 Archived-At: Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Mar 2018 16:34:14 -0000 --Apple-Mail=_6A258F7F-E629-47FD-9D18-E8D904F5F5AD Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi, > On Mar 19, 2018, at 3:31 PM, Richard Scheffenegger = wrote: >=20 >=20 > Hi Michael, >=20 > Just thinking that the difference between loss vs. ECN cwn reduction = might be defined as a relative value of each other, rather than an = absolute; Ah, got it. > In my example, Cubic on FreeBSD used beta 0.8, while Cubic Linux uses = 0.7; with the research showing a sensible Cubic ECN reaction on Linux = being 0.85, correct? (~50% closer to 1). Correct - though beta_ecn =3D 0.8 also worked fine for Cubic; 0.85 just = seemed to be a slightly better choice in our experiments. > So when using Cubic w/ beta 0.8 (as FreeBSD), would a sensible value = for Cubic ECN there a value of 0.9? - no, I don=E2=80=99t think it works like this. Whether a value for = backoff with ECN is good or bad depends on the overall algorithm = behavior, including its increase behavior - not just on its loss backoff = factor. Cheers, Michael --Apple-Mail=_6A258F7F-E629-47FD-9D18-E8D904F5F5AD Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hi,


On = Mar 19, 2018, at 3:31 PM, Richard Scheffenegger <rs.ietf@gmx.at> = wrote:


Hi Michael,

Just thinking that the difference between loss = vs. ECN cwn reduction might be defined as a relative value of each = other, rather than an absolute;

Ah, got it.


In my example, Cubic on FreeBSD = used beta 0.8, while Cubic Linux uses 0.7; with the research showing a = sensible Cubic ECN reaction on Linux being 0.85, correct? (~50% closer = to 1).

Correct - though beta_ecn =3D 0.8 also worked fine for = Cubic; 0.85 just seemed to be a slightly better choice in our = experiments.


So when using Cubic w/ beta 0.8 = (as FreeBSD), would a sensible value for Cubic ECN there a value of = 0.9?

- no, I don=E2=80=99t think it works like this. = Whether a value for backoff with ECN is good or bad depends on the = overall algorithm behavior, including its increase behavior - not just = on its loss backoff factor.

Cheers,
Michael

= --Apple-Mail=_6A258F7F-E629-47FD-9D18-E8D904F5F5AD-- From nobody Mon Mar 19 09:46:59 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BEFA9128959 for ; Mon, 19 Mar 2018 09:46:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.209 X-Spam-Level: X-Spam-Status: No, score=-4.209 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YfjLISJBrDTu for ; Mon, 19 Mar 2018 09:46:55 -0700 (PDT) Received: from pegasus.erg.abdn.ac.uk (pegasus.erg.abdn.ac.uk [139.133.204.173]) by ietfa.amsl.com (Postfix) with ESMTP id 0A4D1127201 for ; Mon, 19 Mar 2018 09:46:55 -0700 (PDT) Received: from dhcp-8e53.meeting.ietf.org (unknown [IPv6:2001:67c:370:128:ec88:e430:e6cb:55b3]) by pegasus.erg.abdn.ac.uk (Postfix) with ESMTPSA id 906471B0012A; Mon, 19 Mar 2018 16:46:52 +0000 (GMT) Message-ID: <5AAFE97A.8080504@erg.abdn.ac.uk> Date: Mon, 19 Mar 2018 16:46:50 +0000 From: G Fairhurst User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: Michael Welzl CC: Richard Scheffenegger , tcpm@ietf.org References: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> <23187136694049B3BEA2C7FAD794E280@srichardlxp2> <31CCB8D4D5D645849D5804DFB17FD030@srichardlxp2> <2945F9B8-60FA-49E4-86AC-36E2C331CE85@ifi.uio.no> In-Reply-To: <2945F9B8-60FA-49E4-86AC-36E2C331CE85@ifi.uio.no> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Mar 2018 16:46:57 -0000 See end. On 19/03/2018, 16:34, Michael Welzl wrote: > Hi, > > >> On Mar 19, 2018, at 3:31 PM, Richard Scheffenegger > > wrote: >> >> >> Hi Michael, >> >> Just thinking that the difference between loss vs. ECN cwn reduction >> might be defined as a relative value of each other, rather than an >> absolute; > > Ah, got it. > > >> In my example, Cubic on FreeBSD used beta 0.8, while Cubic Linux uses >> 0.7; with the research showing a sensible Cubic ECN reaction on Linux >> being 0.85, correct? (~50% closer to 1). > > Correct - though beta_ecn = 0.8 also worked fine for Cubic; 0.85 just > seemed to be a slightly better choice in our experiments. > > >> So when using Cubic w/ beta 0.8 (as FreeBSD), would a sensible value >> for Cubic ECN there a value of 0.9? > > - no, I dont think it works like this. Whether a value for backoff > with ECN is good or bad depends on the overall algorithm behavior, > including its increase behavior - not just on its loss backoff factor. > +1 The range we put in the ID is [0.7,0.85]. If you are hunting for a suggestion, It would be that 0.85 is reasonable choice for a safe reduction for a cubic experiment. Gorry > Cheers, > Michael > > > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm From nobody Mon Mar 19 10:02:44 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 36C971204DA for ; Mon, 19 Mar 2018 10:02:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.619 X-Spam-Level: X-Spam-Status: No, score=-2.619 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XvDxPlzCiPwH for ; Mon, 19 Mar 2018 10:02:40 -0700 (PDT) Received: from mout.gmx.net (mout.gmx.net [212.227.17.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D9EA112D7FC for ; Mon, 19 Mar 2018 10:02:39 -0700 (PDT) Received: from srichardlxp2 ([213.143.121.76]) by mail.gmx.com (mrgmx103 [212.227.17.168]) with ESMTPSA (Nemesis) id 0MMTZa-1eyWg82RJe-008I9U; Mon, 19 Mar 2018 18:02:34 +0100 Message-ID: <1102E320660F4E7F96E7DDE634B568F1@srichardlxp2> From: "Richard Scheffenegger" To: "G Fairhurst" , "Michael Welzl" Cc: References: <7A3A6ECE-550B-4E5F-9D61-83C8969A7B93@fh-muenster.de> <23187136694049B3BEA2C7FAD794E280@srichardlxp2> <31CCB8D4D5D645849D5804DFB17FD030@srichardlxp2> <2945F9B8-60FA-49E4-86AC-36E2C331CE85@ifi.uio.no> <5AAFE97A.8080504@erg.abdn.ac.uk> Date: Mon, 19 Mar 2018 18:02:06 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="Windows-1252"; reply-type=response Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 X-Provags-ID: V03:K0:zRHXrSWo4AErJjCg1kHkZXlXLEjDQlrWCGRBZjdRf0BxvEGtixr yu9dcZQATICKEzr81HEeG9ew/CWzbhvc5tYRcDcKsYRiYiiKO6yXfsQRc073su224NJu7Qn eyiVex4SPOUkgpwqR1ICKhBLq7FU/DBDIL4DiNxbaGuCjRIHBcMahQJO0vUIk34Wb/MEuRJ WxmaksY6BeSsh/GfZSCbA== X-UI-Out-Filterresults: notjunk:1;V01:K0:YHSACKNwYS8=:Pft2i9LS+NgSdOsTFNuude r1KqVuAmEwXetP9pfT2UhN15pRaZXzp3pl+s/cf6Wigosomo7SLh6KGqOU3zlg1o+LClQggYV 4zblgR8yiTJmDgXu1Q/by7oaIxzY7oOzNYQp66NSD70bS+sSkm8y3KLOYBzWCWp0tjyU9d6zT XhewQlpkIfWn0XqcGCpQAQKF2aDZipOqtE3OXnylntCXC4evAm1Wo7LbQOXhuZ2oc49G6WJt0 uTwZEIDyfEvvZOZe1T3UUWI+V/s5/ZNLS73DGvMR6/l5KhwhqdRSwPeegC0WvMBYvLt6NH7Ir vfsTbbmM/WfgkDcbqk7IuzSgRoDAbInfORAOPUff3AOFQrMbS97PoRVX9cqtYcY7xUmo7laRD bxqFgv/eCVouwOVG0h1iKfQ+ryTHHAlykZWu8uZGhizQ+TdjgsnvYE1QryVTDow9LB7Pjf+VP 8kS+oQnKgz3jta7lwgDcClBb5rMBiVv9/LyXdXN0M7wpFovB2HTgkJclX/N8Ni/MZb70KlV3N bigdKn3P5fqtmomhzkGFQVA5zxQAaF3DQBmTxSpIXZa6VJxCBWsv9heJfUIHKT2nL5wmt0y/b P1+WwlPNtE+uGtyIMCuQwzavtg1DNKeVGKadXCWG5lDJWC2zH7V5S7TNall+lrPKL2nWsiDfP 0h1HDt51LEieZZC2NNaZFUYWj9YoPsMtx19LdFT9Rurt0/lMjkDPz41uU1GWTROR06rupXCLg ADTK+mFcwmO4YTS417Vd/SwnbBCR03hOu3tHqoFpuUUaRpDzTsTqfRc8ivRMg4j+u7eznMpKm Yc+tY4/Qo+lF/BCzpJMpfgkUn2vG/tsZL3pkYrBIwIGlGnWO78= Archived-At: Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Mar 2018 17:02:43 -0000 Thanks Gorry, Michael, so to sum it up - a CC should document a safe range of tunables, and the ABE variant would pick values within these intervals that may be slightly more agressive, vs. loss based. The guidance on the safe interval of Cubic is noted, and I'll keep that in mind! Best regards, Richard ----- Original Message ----- From: "G Fairhurst" To: "Michael Welzl" Cc: "Richard Scheffenegger" ; Sent: Monday, March 19, 2018 5:46 PM Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-alternativebackoff-ecn-06 See end. On 19/03/2018, 16:34, Michael Welzl wrote: > Hi, > > >> On Mar 19, 2018, at 3:31 PM, Richard Scheffenegger > > wrote: >> >> >> Hi Michael, >> >> Just thinking that the difference between loss vs. ECN cwn reduction >> might be defined as a relative value of each other, rather than an >> absolute; > > Ah, got it. > > >> In my example, Cubic on FreeBSD used beta 0.8, while Cubic Linux uses >> 0.7; with the research showing a sensible Cubic ECN reaction on Linux >> being 0.85, correct? (~50% closer to 1). > > Correct - though beta_ecn = 0.8 also worked fine for Cubic; 0.85 just > seemed to be a slightly better choice in our experiments. > > >> So when using Cubic w/ beta 0.8 (as FreeBSD), would a sensible value for >> Cubic ECN there a value of 0.9? > > - no, I dont think it works like this. Whether a value for backoff with > ECN is good or bad depends on the overall algorithm behavior, including > its increase behavior - not just on its loss backoff factor. > +1 The range we put in the ID is [0.7,0.85]. If you are hunting for a suggestion, It would be that 0.85 is reasonable choice for a safe reduction for a cubic experiment. Gorry > Cheers, > Michael > > > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm --- This email has been checked for viruses by AVG. http://www.avg.com From nobody Tue Mar 20 08:01:07 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 474F0126C25; Mon, 19 Mar 2018 10:47:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.719 X-Spam-Level: X-Spam-Status: No, score=-2.719 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=dell.com 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port 10024) with ESMTP id BQKjbHmD8dSl for ; Tue, 20 Mar 2018 11:21:17 -0700 (PDT) Received: from server.dnsblock1.com (server.dnsblock1.com [85.13.236.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 02E00128896 for ; Tue, 20 Mar 2018 11:21:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=bobbriscoe.net; s=default; h=Content-Type:In-Reply-To:MIME-Version:Date: Message-ID:References:Cc:To:Subject:From:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=0RFIQP+sQueE0XywSIh3JjPaXL1ZBXp2TBer2OS2b4E=; b=F36mqaAsTIxuxb45eqfewmgq1 Hfio5OyWKfpjiDn9UGLX8Hy3R5LY6hdjSBVKhrfrpi/R7fBngZwQv15k7BwzJV1ZjDd/tT3GAfzrj e5fc9amjkuCairPKsZHdfizZOGSMMQKFgD0QXRpcphViL5s7EB0fM137BavPFxU30rJ8NS26vGYKX S2/o30mvsQp4g24vi2amAzy4kcJzLMfAYB1ufg5mRwZGypWMdhYXaLsagUDKd49JpPjOslglzfB9K i3X8Mdn8fGGPhbaYo5X8eF6c1gE9siGWwC905pQT4YgZzyHLXTogrBK7ja9Gq1CFbMdqHMWyGf/4Q dZr7yhu9A==; Received: from dhcp-80b8.meeting.ietf.org ([31.133.128.184]:41332) by server.dnsblock1.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89_1) (envelope-from ) id 1eyLso-0000Vw-4K; Tue, 20 Mar 2018 18:21:14 +0000 From: Bob Briscoe To: Yuchung Cheng Cc: draft-ietf-tcpm-rack@tools.ietf.org, tcpm@ietf.org References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> Message-ID: Date: Tue, 20 Mar 2018 18:21:13 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <152029151070.12715.15497200993114582811@ietfa.amsl.com> Content-Type: multipart/alternative; boundary="------------BF79D5BC4ADEF7F06EBC3A0E" Content-Language: en-GB X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.dnsblock1.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - bobbriscoe.net X-Get-Message-Sender-Via: server.dnsblock1.com: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: server.dnsblock1.com: in@bobbriscoe.net Archived-At: Subject: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Mar 2018 18:21:20 -0000 This is a multi-part message in MIME format. --------------BF79D5BC4ADEF7F06EBC3A0E Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Yuchung, What I was trying to say at the tcpm mic just now. This could be considered as a first draft of the text you asked me to write... The Bigger Picture The reordering degree of a link is not a constant. It evolves (over years) dependent on TCP. * From a link designers viewpoint, parallelizing (eg. link bonding) is the easiest way to get their link to go faster o So their main constraint on speed is reordering and there is huge pressure on them to relax that constraint o The /only/ thing that is holding them back from introducing more reordering is the 3 dupacks in TCP or the RTT/4 rule in RACK-02 * It is likely RACK will become widespread * Given RACK-03 now adapts to the reordering window, link designers will introduce more reordering * That is GOOD (virtuous circle), but only up to a point (vicious circle). o We need to write down what that point is o We need to ensure the algorithm stops adapting at that point. Put in IETF process terms, the draft needs to state the WG's consensus of what the goal of the experiment is. Otherwise: * we can't judge whether the experiment has succeeded. * we can't invent alternative algorithms to better reach the goal. TCP Specifics: TCP cannot tell immediately whether a hole is reordering or loss. It only knows in hindsight (if the hole gets filled later). It is good (up to a point) to allow more reordering in the network, and repair the reordering within the receive buffer instead. It is also good (up to a point) for TCP to be able to deem that a loss has occurred as quickly as possible. However, * the longer the reordering window, the longer it takes to repair losses * the faster loss is repaired, the more spurious retransmissions These two represent a trade-off between latency and bandwidth efficiency. Given the reordering window could evolve to grow without bound (see 'the bigger picture'),... ...Where is the best trade-off point? What assumption about the answer to this problem did you make when designing the algo in RACK-03? Bob On 05/03/18 23:11, internet-drafts@ietf.org wrote: > A New Internet-Draft is available from the on-line Internet-Drafts directories. > This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF. > > Title : RACK: a time-based fast loss detection algorithm for TCP > Authors : Yuchung Cheng > Neal Cardwell > Nandita Dukkipati > Priyaranjan Jha > Filename : draft-ietf-tcpm-rack-03.txt > Pages : 25 > Date : 2018-03-05 > > Abstract: > This document presents a new TCP loss detection algorithm called RACK > ("Recent ACKnowledgment"). RACK uses the notion of time, instead of > packet or sequence counts, to detect losses, for modern TCP > implementations that can support per-packet timestamps and the > selective acknowledgment (SACK) option. It is intended to replace > the conventional DUPACK threshold approach and its variants, as well > as other nonstandard approaches. > > > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-tcpm-rack/ > > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-tcpm-rack-03 > https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-rack-03 > > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rack-03 > > > Please note that it may take a couple of minutes from the time of submission > until the htmlized version and diff are available at tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm > -- ________________________________________________________________ Bob Briscoehttp://bobbriscoe.net/ --------------BF79D5BC4ADEF7F06EBC3A0E Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit Yuchung,

What I was trying to say at the tcpm mic just now.
This could be considered as a first draft of the text you asked me to write...

The Bigger Picture

The reordering degree of a link is not a constant. It evolves (over years) dependent on TCP.
  • From a link designers viewpoint, parallelizing (eg. link bonding) is the easiest way to get their link to go faster
    • So their main constraint on speed is reordering and there is huge pressure on them to relax that constraint
    • The /only/ thing that is holding them back from introducing more reordering is the 3 dupacks in TCP or the RTT/4 rule in RACK-02
  • It is likely RACK will become widespread
  • Given RACK-03 now adapts to the reordering window, link designers will introduce more reordering
  • That is GOOD (virtuous circle), but only up to a point (vicious circle).
    • We need to write down what that point is
    • We need to ensure the algorithm stops adapting at that point.
Put in IETF process terms, the draft needs to state the WG's consensus of what the goal of the experiment is. Otherwise:
  • we can't judge whether the experiment has succeeded.
  • we can't invent alternative algorithms to better reach the goal.

TCP Specifics:

TCP cannot tell immediately whether a hole is reordering or loss.
It only knows in hindsight (if the hole gets filled later).

It is good (up to a point) to allow more reordering in the network, and repair the reordering within the receive buffer instead.
It is also good (up to a point) for TCP to be able to deem that a loss has occurred as quickly as possible.

However,
  • the longer the reordering window, the longer it takes to repair losses
  • the faster loss is repaired, the more spurious retransmissions
These two represent a trade-off between latency and bandwidth efficiency.

Given the reordering window could evolve to grow without bound (see 'the bigger picture'),...
...Where is the best trade-off point?

What assumption about the answer to this problem did you make when designing the algo in RACK-03?



Bob

On 05/03/18 23:11, internet-drafts@ietf.org wrote:
A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF.

        Title           : RACK: a time-based fast loss detection algorithm for TCP
        Authors         : Yuchung Cheng
                          Neal Cardwell
                          Nandita Dukkipati
                          Priyaranjan Jha
	Filename        : draft-ietf-tcpm-rack-03.txt
	Pages           : 25
	Date            : 2018-03-05

Abstract:
   This document presents a new TCP loss detection algorithm called RACK
   ("Recent ACKnowledgment").  RACK uses the notion of time, instead of
   packet or sequence counts, to detect losses, for modern TCP
   implementations that can support per-packet timestamps and the
   selective acknowledgment (SACK) option.  It is intended to replace
   the conventional DUPACK threshold approach and its variants, as well
   as other nonstandard approaches.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-rack/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-tcpm-rack-03
https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-rack-03

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rack-03


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm



-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/
--------------BF79D5BC4ADEF7F06EBC3A0E-- From nobody Tue Mar 20 16:25:18 2018 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 2E25A1200B9; Tue, 20 Mar 2018 16:25:17 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: tcpm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.75.2 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <152158831714.6268.10278836990076099093@ietfa.amsl.com> Date: Tue, 20 Mar 2018 16:25:17 -0700 Archived-At: Subject: [tcpm] I-D Action: draft-ietf-tcpm-alternativebackoff-ecn-07.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Mar 2018 23:25:17 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF. Title : TCP Alternative Backoff with ECN (ABE) Authors : Naeem Khademi Michael Welzl Grenville Armitage Godred Fairhurst Filename : draft-ietf-tcpm-alternativebackoff-ecn-07.txt Pages : 13 Date : 2018-03-20 Abstract: Active Queue Management (AQM) mechanisms allow for burst tolerance while enforcing short queues to minimise the time that packets spend enqueued at a bottleneck. This can cause noticeable performance degradation for TCP connections traversing such a bottleneck, especially if there are only a few flows or their bandwidth-delay- product is large. An Explicit Congestion Notification (ECN) signal indicates that an AQM mechanism is used at the bottleneck, and therefore the bottleneck network queue is likely to be short. This document therefore proposes an update to RFC3168, which changes the TCP sender-side ECN reaction in congestion avoidance to reduce the Congestion Window (cwnd) by a smaller amount than the congestion control algorithm's reaction to inferred packet loss. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-tcpm-alternativebackoff-ecn/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-tcpm-alternativebackoff-ecn-07 https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-alternativebackoff-ecn-07 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-alternativebackoff-ecn-07 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Tue Mar 20 18:23:14 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8BA8B12D77D for ; Tue, 20 Mar 2018 18:23:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.99 X-Spam-Level: X-Spam-Status: No, score=-1.99 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_SPF_PERMERROR=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GXBZ484LHCl5 for ; Tue, 20 Mar 2018 18:23:11 -0700 (PDT) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1F3B81205F0 for ; Tue, 20 Mar 2018 18:23:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To:Subject:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=xr/NHUZz5ok7FdarENtCB0oFekvV7g9P8NjteFo9WJM=; b=ly/8HN3qdwyxV4hwRr3IjSI52I NkitcHnsCOe2zq7DXvr2uKm1+GB2XOMoIRnxpr+V7OT073wvY+yfonwFMKC7cAzy6jEzqC2hdRkIx 2jEBdCHITGHjqm4fLyBKQG7BwKCULwlpJ+B6SSKqBcBTN6HPbNMhAXAyndcL2Kx/O1w1O3fTLf74D VayHoloJwo8qPagPaEXKsSaXP9Lkqnw6zeyt6gJNHI1zo603OM8lRO+PTZMHBm4N87KNl2Elagcal nPZZNbuciMV4m5RreUfsphIhUMU7hZgVk91dyq6EnH3mMqs37FWC/ZQPZWh9h0DGlpnsf9cJwu5qr 4kolfy1A==; Received: from cpe-172-250-240-132.socal.res.rr.com ([172.250.240.132]:54810 helo=[192.168.1.189]) by server217.web-hosting.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89_1) (envelope-from ) id 1eySSw-002rW9-Fj; Tue, 20 Mar 2018 21:22:59 -0400 To: Bob Briscoe , Yuchung Cheng Cc: tcpm@ietf.org, draft-ietf-tcpm-rack@tools.ietf.org References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> From: Joe Touch Message-ID: <2a4c5b99-30cd-f990-99be-70ee64c04dc2@strayalpha.com> Date: Tue, 20 Mar 2018 18:22:57 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Mar 2018 01:23:13 -0000 Hi, all, Regarding the fragmentation part of this issue: At some level, we need to understand that "fragmentation is harmful" is fundamentally incorrect and misleading. The reality is that "network devices that rely on transport info without reconstituting it are harmful". I.e., any device that forwards, filters, translates, folds, spindles, or otherwise mutilates IP packets based on transport information needs to either:     a) act like the transport endpoint it becomes once it relies on transport info, and reassemble the fragments into a full packet or     b) emulate the net effect of (a) by caching initial fragment state and processing subsequent fragments in that context (perhaps including holding non-initial fragments until that initial frag creates that state). Devices that claim to be line-rate forwarders but can't do the above at line rate are broken and/or lying about their performance, not "optimized". Optimization works better than the default; the default case still has to work. Joe From nobody Wed Mar 21 03:24:17 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2BCAE124F57 for ; Wed, 21 Mar 2018 03:24:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.71 X-Spam-Level: X-Spam-Status: No, score=-2.71 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WsRrDIb_61Ld for ; Wed, 21 Mar 2018 03:24:14 -0700 (PDT) Received: from mail-it0-x230.google.com (mail-it0-x230.google.com [IPv6:2607:f8b0:4001:c0b::230]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CE79C12420B for ; Wed, 21 Mar 2018 03:24:13 -0700 (PDT) Received: by mail-it0-x230.google.com with SMTP id w3-v6so6209064itc.4 for ; Wed, 21 Mar 2018 03:24:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=36aeg1EytjKXvY4I8+Y/qpFXmYF+jelgmfFflxz38OU=; b=v6C03LhHHpuB5EseDnOdUaUq+BdNejo7XvX+05f54VfcG6IvAzCsmtpb9J7cl3cKg2 0Y0FL2rK7GKffhWdH+U/Iz48pUYRw/HFNC7U/Dsuik76muJM7Wk01DsVx+LP91gvuDvo gEtVqztFWQC56LbYpGZVQMmcy/Nz0Re/MGD5LuVUXWaW6rPoVYNAdgzUa6RMGuRdFbKE N605kknuHMjh0LGV4urhKULxzTR1RDom6xYWH//MHnptIeTv81dJGh/HX0MMEk3rPc9I Yql8eFEihFeCTr7nuMOvoY9gqZFgdZenDw19gsDGYkT7FSceFoJILw4aHDF2uJ4fgg7B qqTQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=36aeg1EytjKXvY4I8+Y/qpFXmYF+jelgmfFflxz38OU=; b=C0ggFhbl4b9JFVVH+cfY+JaQBJI43abAgenjCb7qb5m2ghm6LcqRwW6mka6oJ8ju41 8HpWkfU999ZRhBvsQ/B1XiZ9fe+cIJIKkIODzcYhVd1+POq94qaacj8gbSZJEntMWgVa dCVj2Jp6Aqeh+ETPMrNADcoQhQ/y3yM2ir8SsEGOjceEer2dEwJ4mvaIz05aBArrlYC6 uWkxvvirI0KpuwNJ7Tc3yWPSuZPSD7xIT7o9z/6Q8jcPkOtw0St/Hf59utdHX71qE8dA d4DnH7dOa04bHN9nDIqLu6MmZpKFOSZahURYCvx8cm3pW5HI16LGDuBO3Bnzkw5G2gGv Vwdw== X-Gm-Message-State: AElRT7F9MEPQDKzCKRo4+3OOocr6zz/SgOv1jjtiAau0VKE449yKveBp GoBHNfSk40H9ltdWk0HvMLebdvUfH8cdpO7TcXEcxg== X-Google-Smtp-Source: AG47ELtG3Q5YB6B1tckMvi/ICOPl0cW8kUvM3gGPbrDmrMquktM3bS9AnikSX00cXVib7Sdt+j9zaLvHUD7Ip3mZJpk= X-Received: by 2002:a24:ac07:: with SMTP id s7-v6mr3391270ite.116.1521627852645; Wed, 21 Mar 2018 03:24:12 -0700 (PDT) MIME-Version: 1.0 Received: by 10.107.138.29 with HTTP; Wed, 21 Mar 2018 03:23:31 -0700 (PDT) In-Reply-To: References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> From: Yuchung Cheng Date: Wed, 21 Mar 2018 03:23:31 -0700 Message-ID: To: Bob Briscoe Cc: draft-ietf-tcpm-rack@tools.ietf.org, "tcpm@ietf.org Extensions" Content-Type: text/plain; charset="UTF-8" Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Mar 2018 10:24:16 -0000 On Tue, Mar 20, 2018 at 11:21 AM, Bob Briscoe wrote: > Yuchung, > > What I was trying to say at the tcpm mic just now. > This could be considered as a first draft of the text you asked me to > write... > > The Bigger Picture > > The reordering degree of a link is not a constant. It evolves (over years) > dependent on TCP. > > From a link designers viewpoint, parallelizing (eg. link bonding) is the > easiest way to get their link to go faster > > So their main constraint on speed is reordering and there is huge pressure > on them to relax that constraint > The /only/ thing that is holding them back from introducing more reordering > is the 3 dupacks in TCP or the RTT/4 rule in RACK-02 > > It is likely RACK will become widespread > Given RACK-03 now adapts to the reordering window, link designers will > introduce more reordering > That is GOOD (virtuous circle), but only up to a point (vicious circle). > > We need to write down what that point is > > We need to ensure the algorithm stops adapting at that point. > > Put in IETF process terms, the draft needs to state the WG's consensus of > what the goal of the experiment is. Otherwise: > > we can't judge whether the experiment has succeeded. > we can't invent alternative algorithms to better reach the goal. > > TCP Specifics: > > TCP cannot tell immediately whether a hole is reordering or loss. > It only knows in hindsight (if the hole gets filled later). > > It is good (up to a point) to allow more reordering in the network, and > repair the reordering within the receive buffer instead. > It is also good (up to a point) for TCP to be able to deem that a loss has > occurred as quickly as possible. > > However, > > the longer the reordering window, the longer it takes to repair losses > the faster loss is repaired, the more spurious retransmissions > > These two represent a trade-off between latency and bandwidth efficiency. > > Given the reordering window could evolve to grow without bound (see 'the > bigger picture'),... > ...Where is the best trade-off point? > > What assumption about the answer to this problem did you make when designing > the algo in RACK-03? Thank you. I agree we need to clarify the degree of reordering window TCP should/would tolerate. We designed RACK based on studying the current traces we collected at Google. I see largely three kinds of reordering: 1) router parallelism. key symptom: the sub-MSS packet in the end of a window burst arrives first. the rest follows in order. e.g. P10,P1,P2,...P9. the reordering degree << min-RTT (except low BW) 2) wireless retransmission/burst at first/last hop: notably 802.11n block ACK may cause out-of-order delivery of TCP packets. Despite a reordering buffer is mandated in the spec, not all drivers implement that. symptom: random permutation of delivery but the degree in time is usually within the estimated RTT (e.g. SRTT) at the time of reordering. 3) the path is significantly shorten'd due to traffic engineering - the reordering degree is unbounded but happens infrequently (i.e. once many RTTs). [not observed but a bonus feature] 4) flowlet: ECMP is universally deployed. but being able to tolerate small degree of reordering enables flowlet idea for better load-balacning in some cases. That is an elephant flow may use "slightly different" path at times. We want TCP to accommodate small-degree but frequent reordering introduced (i.e. within a round trip) in (1)(2)(4). Therefore RACK reordering window is cap'd to SRTT. Theoretically max_RTT makes more sense but we're concerned of bufferbloat. Although maintaining reordering within an RTT is difficult for route designers as they don't want to or can't know RTT. 3 DUPACKs is easier to implement. We're open to wide discussion about this design point -- although it might be better to have a separate draft on this aspect (similar to Joe's comments) --- and RACK is only one recovery mechanism that honors the guidelines. > > > > Bob > > On 05/03/18 23:11, internet-drafts@ietf.org wrote: > > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the TCP Maintenance and Minor Extensions WG of > the IETF. > > Title : RACK: a time-based fast loss detection algorithm > for TCP > Authors : Yuchung Cheng > Neal Cardwell > Nandita Dukkipati > Priyaranjan Jha > Filename : draft-ietf-tcpm-rack-03.txt > Pages : 25 > Date : 2018-03-05 > > Abstract: > This document presents a new TCP loss detection algorithm called RACK > ("Recent ACKnowledgment"). RACK uses the notion of time, instead of > packet or sequence counts, to detect losses, for modern TCP > implementations that can support per-packet timestamps and the > selective acknowledgment (SACK) option. It is intended to replace > the conventional DUPACK threshold approach and its variants, as well > as other nonstandard approaches. > > > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-tcpm-rack/ > > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-tcpm-rack-03 > https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-rack-03 > > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rack-03 > > > Please note that it may take a couple of minutes from the time of submission > until the htmlized version and diff are available at tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm > > > -- > ________________________________________________________________ > Bob Briscoe http://bobbriscoe.net/ From nobody Wed Mar 21 03:47:09 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 59D5B12DA4B for ; Wed, 21 Mar 2018 03:47:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id F20eAgFFchDP for ; Wed, 21 Mar 2018 03:46:59 -0700 (PDT) Received: from mout.gmx.net (mout.gmx.net [212.227.17.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 114F612DA72 for ; Wed, 21 Mar 2018 03:46:58 -0700 (PDT) Received: from [31.133.142.122] ([31.133.142.122]) by msvc-mesg-gmx022.server.lan (via HTTP); Wed, 21 Mar 2018 11:46:12 +0100 MIME-Version: 1.0 Message-ID: From: rs.ietf@gmx.at To: ycheng@google.com Cc: ietf@bobbriscoe.net, tcpm@ietf.org, draft-ietf-tcpm-rack@tools.ietf.org Content-Type: text/plain; charset=UTF-8 Importance: normal Date: Wed, 21 Mar 2018 11:46:12 +0100 Content-Transfer-Encoding: quoted-printable X-Priority: 3 X-Provags-ID: V03:K1:rBD3wkISJbPggPb9XFwOK7Y6/T5NW5ACA9tMudxZIhU fS3nLMiuN6VD/bJuJ1BgnloC/uq2cQbgfVD6KJVoXpPTNzhpSu XVXKWj1wWfm5bCAOZQQy0tVpMn0UPOQZGULrwRDIs6Yt/ZFtSX Qc2skQ+3BTZwXJMomZrE6i7eY/X32xHaNNA2olsjWhJYtVMBfW 6rNgJq2M57SLnuywlCAet3yNH9nRtt9h+1YzcxAR1ZWEhe7ZAm e1C3508zyCqnJSrBGRVdOBhVERpt9yXuF90dD/ScjSGG3Byor1 JXtHWH075EQUToeGi+wTpL5e7NY X-UI-Out-Filterresults: notjunk:1;V01:K0:EpizBzIkDvs=:njxgc0vha0EeQvaToowQno qnP8s1u409heLBml2S68j4d30jPL+OLXhDK+djpB+5jSr5LLJcEMc5pRQlTV88dKZhwJ2O+X3 8//LQAywGtMR6GHbe+DoRsB6iEgc9hXKJcnEg5vyTBNMH0ztvbsfIe4G05YICp6M2bymgrar0 5bgy30krhoeKgLxS7Zj3B7BRxFQRJcyRMLLFI0JmRIJ8HD+UrzFk5ScefLSfU+KqN5Ht0YCd5 FsqGJVP4HMXHt9fWA3r94TmtX49VqVEIuuh2smcGvW92oOO2z74NG9nh7NrQDLiD3xyQEkiDu KTS4/4cik65zXOhsLx+xSvwGU/1oNFegQxO/mvRiUtOvLXHlGR68aSxyuQQ6BzMssdKfXZcV/ Kk7Vvx37AmsDcAwrMC2fetD+ajMVri9NF7QuL/FJDuJ9xUiKkHo9tGGZ3xHi9KVsVvD3OkCfU Auu4N99XgnDLAJdVZbPB+aS4BgIG6KTmK5GWqqhnil2t3dLrHfmrsv6qi2WVUARa2i9q6f4SU FuyqF/t3vx0e2eASuttysQ= Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Mar 2018 10:47:02 -0000 Bob, Yuchung, Group, Looking below L3 ECMP, another interesting aspect of relaxing the strict i= n-order delivery requirement made possible with this work might be environm= ents with limited capabilities to do stochastic flow-based load-balancing a= cross multiple links, e=2Eg=2E Ethernet LACP, while only very few TCP sessi= ons cross that logical link, like what you find in a typical commercial ent= erprise environment=2E Allowing round-robin load-balancing across links which have link latency d= ifferences beyond the skew buffer (e=2Eg=2E 40G vs 4x 10G LACP) can result = in more effective bandwidth on such L2 technologies=2E=2E=2E However, I'm of split opinion on this relaxation of the strict in-order de= livery requirment=2E=20 Bandwidth can be improved - in particular with situations as mentioned abo= ve - but I'm concernd that the effective delivery latency might get worse (= more processing overhead in the receiver, to get the data in-order)? Or is = that concern misplaced? One datapoint I would like to see would be a comparison of the receiving t= cp stack cpu cost, comparing persistent, heavy reordering at around 1/2 RTT= at the same sender bandwidth as a "proper" in-order delivered datastream= =2E=2E=2E=20 Best regards, Richard --- Ich habe diese Nachricht mit der GMX Mail App f=C3=BCr Windows erstellt=2E -----Urspr=C3=BCngliche Nachricht----- Von: "Yuchung Cheng" Gesendet: Mittwoch, 21=2E M=C3=A4rz 2018 10:23 An: "Bob Briscoe" Cc: "tcpm@ietf=2Eorg Extensions" ; draft-ietf-tcpm-rack@t= ools=2Eietf=2Eorg Betreff: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window= to reordering degree On Tue, Mar 20, 2018 at 11:21 AM, Bob Briscoe wrot= e: > Yuchung, > > What I was trying to say at the tcpm mic just now=2E > This could be considered as a first draft of the text you asked me to > write=2E=2E=2E > > The Bigger Picture > > The reordering degree of a link is not a constant=2E It evolves (over ye= ars) > dependent on TCP=2E > > From a link designers viewpoint, parallelizing (eg=2E link bonding) is t= he > easiest way to get their link to go faster > > So their main constraint on speed is reordering and there is huge pressu= re > on them to relax that constraint > The /only/ thing that is holding them back from introducing more reorder= ing > is the 3 dupacks in TCP or the RTT/4 rule in RACK-02 > > It is likely RACK will become widespread > Given RACK-03 now adapts to the reordering window, link designers will > introduce more reordering > That is GOOD (virtuous circle), but only up to a point (vicious circle)= =2E > > We need to write down what that point is > > We need to ensure the algorithm stops adapting at that point=2E > > Put in IETF process terms, the draft needs to state the WG's consensus o= f > what the goal of the experiment is=2E Otherwise: > > we can't judge whether the experiment has succeeded=2E > we can't invent alternative algorithms to better reach the goal=2E > > TCP Specifics: > > TCP cannot tell immediately whether a hole is reordering or loss=2E > It only knows in hindsight (if the hole gets filled later)=2E > > It is good (up to a point) to allow more reordering in the network, and > repair the reordering within the receive buffer instead=2E > It is also good (up to a point) for TCP to be able to deem that a loss h= as > occurred as quickly as possible=2E > > However, > > the longer the reordering window, the longer it takes to repair losses > the faster loss is repaired, the more spurious retransmissions > > These two represent a trade-off between latency and bandwidth efficiency= =2E > > Given the reordering window could evolve to grow without bound (see 'the > bigger picture'),=2E=2E=2E > =2E=2E=2EWhere is the best trade-off point? > > What assumption about the answer to this problem did you make when desig= ning > the algo in RACK-03? Thank you=2E I agree we need to clarify the degree of reordering window TCP should/would tolerate=2E We designed RACK based on studying the current traces we collected at Google=2E I see largely three kinds of reordering: 1) router parallelism=2E key symptom: the sub-MSS packet in the end of a window burst arrives first=2E the rest follows in order=2E e=2Eg=2E P10,P1,P2,=2E=2E=2EP9=2E the reordering degree << min-RTT (except low BW) 2) wireless retransmission/burst at first/last hop: notably 802=2E11n block ACK may cause out-of-order delivery of TCP packets=2E Despite a reordering buffer is mandated in the spec, not all drivers implement that=2E symptom: random permutation of delivery but the degree in time is usually within the estimated RTT (e=2Eg=2E SRTT) at the time of reordering=2E 3) the path is significantly shorten'd due to traffic engineering - the reordering degree is unbounded but happens infrequently (i=2Ee=2E once many RTTs)=2E [not observed but a bonus feature] 4) flowlet: ECMP is universally deployed=2E but being able to tolerate small degree of reordering enables flowlet idea for better load-balacning in some cases=2E That is an elephant flow may use "slightly different" path at times=2E We want TCP to accommodate small-degree but frequent reordering introduced (i=2Ee=2E within a round trip) in (1)(2)(4)=2E Therefore RACK reordering window is cap'd to SRTT=2E Theoretically max_RTT makes more sense but we're concerned of bufferbloat=2E Although maintaining reordering within an RTT is difficult for route designers as they don't want to or can't know RTT=2E 3 DUPACKs is easier to implement=2E We're open to wide discussion about this design point -- although it might be better to have a separate draft on this aspect (similar to Joe's comments) --- and RACK is only one recovery mechanism that honors the guidelines=2E > > > > Bob > > On 05/03/18 23:11, internet-drafts@ietf=2Eorg wrote: > > A New Internet-Draft is available from the on-line Internet-Drafts > directories=2E > This draft is a work item of the TCP Maintenance and Minor Extensions WG= of > the IETF=2E > > Title : RACK: a time-based fast loss detection algorit= hm > for TCP > Authors : Yuchung Cheng > Neal Cardwell > Nandita Dukkipati > Priyaranjan Jha > Filename : draft-ietf-tcpm-rack-03=2Etxt > Pages : 25 > Date : 2018-03-05 > > Abstract: > This document presents a new TCP loss detection algorithm called RACK > ("Recent ACKnowledgment")=2E RACK uses the notion of time, instead o= f > packet or sequence counts, to detect losses, for modern TCP > implementations that can support per-packet timestamps and the > selective acknowledgment (SACK) option=2E It is intended to replace > the conventional DUPACK threshold approach and its variants, as well > as other nonstandard approaches=2E > > > The IETF datatracker status page for this draft is: > https://datatracker=2Eietf=2Eorg/doc/draft-ietf-tcpm-rack/ > > There are also htmlized versions available at: > https://tools=2Eietf=2Eorg/html/draft-ietf-tcpm-rack-03 > https://datatracker=2Eietf=2Eorg/doc/html/draft-ietf-tcpm-rack-03 > > A diff from the previous version is available at: > https://www=2Eietf=2Eorg/rfcdiff?url2=3Ddraft-ietf-tcpm-rack-03 > > > Please note that it may take a couple of minutes from the time of submis= sion > until the htmlized version and diff are available at tools=2Eietf=2Eorg= =2E > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp=2Eietf=2Eorg/internet-drafts/ > > _______________________________________________ > tcpm mailing list > tcpm@ietf=2Eorg > https://www=2Eietf=2Eorg/mailman/listinfo/tcpm > > > -- > ________________________________________________________________ > Bob Briscoe http://bobbriscoe=2Enet/ _______________________________________________ tcpm mailing list tcpm@ietf=2Eorg https://www=2Eietf=2Eorg/mailman/listinfo/tcpm From nobody Wed Mar 21 03:51:54 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B05F0124E15 for ; Wed, 21 Mar 2018 03:51:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=bobbriscoe.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0Ss9lbiKCrnS for ; Wed, 21 Mar 2018 03:51:48 -0700 (PDT) Received: from server.dnsblock1.com (server.dnsblock1.com [85.13.236.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1D75A12DA46 for ; Wed, 21 Mar 2018 03:51:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=bobbriscoe.net; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-GB X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.dnsblock1.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - bobbriscoe.net X-Get-Message-Sender-Via: server.dnsblock1.com: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: server.dnsblock1.com: in@bobbriscoe.net Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Mar 2018 10:51:51 -0000 Yuchung, Thanks. I understand all this. Responses inline... On 21/03/18 10:23, Yuchung Cheng wrote: > On Tue, Mar 20, 2018 at 11:21 AM, Bob Briscoe wrote: >> Yuchung, >> >> What I was trying to say at the tcpm mic just now. >> This could be considered as a first draft of the text you asked me to >> write... >> >> The Bigger Picture >> >> The reordering degree of a link is not a constant. It evolves (over years) >> dependent on TCP. >> >> From a link designers viewpoint, parallelizing (eg. link bonding) is the >> easiest way to get their link to go faster >> >> So their main constraint on speed is reordering and there is huge pressure >> on them to relax that constraint >> The /only/ thing that is holding them back from introducing more reordering >> is the 3 dupacks in TCP or the RTT/4 rule in RACK-02 >> >> It is likely RACK will become widespread >> Given RACK-03 now adapts to the reordering window, link designers will >> introduce more reordering >> That is GOOD (virtuous circle), but only up to a point (vicious circle). >> >> We need to write down what that point is >> >> We need to ensure the algorithm stops adapting at that point. >> >> Put in IETF process terms, the draft needs to state the WG's consensus of >> what the goal of the experiment is. Otherwise: >> >> we can't judge whether the experiment has succeeded. >> we can't invent alternative algorithms to better reach the goal. >> >> TCP Specifics: >> >> TCP cannot tell immediately whether a hole is reordering or loss. >> It only knows in hindsight (if the hole gets filled later). >> >> It is good (up to a point) to allow more reordering in the network, and >> repair the reordering within the receive buffer instead. >> It is also good (up to a point) for TCP to be able to deem that a loss has >> occurred as quickly as possible. >> >> However, >> >> the longer the reordering window, the longer it takes to repair losses >> the faster loss is repaired, the more spurious retransmissions >> >> These two represent a trade-off between latency and bandwidth efficiency. >> >> Given the reordering window could evolve to grow without bound (see 'the >> bigger picture'),... >> ...Where is the best trade-off point? >> >> What assumption about the answer to this problem did you make when designing >> the algo in RACK-03? > Thank you. I agree we need to clarify the degree of reordering window > TCP should/would tolerate. You say TCP "should/would". From your response below, it looks like an answer is already in the RACK code. > > We designed RACK based on studying the current traces we collected at > Google. I see largely three kinds of reordering: > 1) router parallelism. key symptom: the sub-MSS packet in the end of a > window burst arrives first. the rest follows in order. e.g. > P10,P1,P2,...P9. the reordering degree << min-RTT (except low BW) > 2) wireless retransmission/burst at first/last hop: notably 802.11n > block ACK may cause out-of-order delivery of TCP packets. Despite a > reordering buffer is mandated in the spec, not all drivers implement > that. symptom: random permutation of delivery but the degree in time > is usually within the estimated RTT (e.g. SRTT) at the time of > reordering. > 3) the path is significantly shorten'd due to traffic engineering - > the reordering degree is unbounded but happens infrequently (i.e. once > many RTTs). > > [not observed but a bonus feature] > 4) flowlet: ECMP is universally deployed. but being able to tolerate > small degree of reordering enables flowlet idea for better > load-balacning in some cases. That is an elephant flow may use > "slightly different" path at times. > > We want TCP to accommodate small-degree but frequent reordering > introduced (i.e. within a round trip) in (1)(2)(4). Therefore RACK > reordering window is cap'd to SRTT. Theoretically max_RTT makes more > sense but we're concerned of bufferbloat. "Theoretically"? What theory? This is a tradeoff between bandwidth efficiency and latency. So why is the answer only related to RTT? I think you mean "practically" rather than "theoretically". IOW, the implementation is constrained by a separate tradeoff that makes it hard to work at all, if you wait >SRTT. But that nearly doubles the time before loss recovery starts (assuming link designers eventually make reordering degree expand to fill the space available). I think most apps would be happier with some more spurious retransmissions but faster recovery. > > Although maintaining reordering within an RTT is difficult for route > designers as they don't want to or can't know RTT. 3 DUPACKs is easier > to implement. We're open to wide discussion about this design point -- > although it might be better to have a separate draft on this aspect > (similar to Joe's comments) --- and RACK is only one recovery > mechanism that honors the guidelines. I think different applications will have different answers - but I suspect we could make a guess in TCP and not need a socket option. However, it's important not to punt difficult but important questions. It's not safe for tcpm to let you drive this car, if no-one has a clue where the brake is. Bob Bob > > >> >> >> Bob >> >> On 05/03/18 23:11, internet-drafts@ietf.org wrote: >> >> A New Internet-Draft is available from the on-line Internet-Drafts >> directories. >> This draft is a work item of the TCP Maintenance and Minor Extensions WG of >> the IETF. >> >> Title : RACK: a time-based fast loss detection algorithm >> for TCP >> Authors : Yuchung Cheng >> Neal Cardwell >> Nandita Dukkipati >> Priyaranjan Jha >> Filename : draft-ietf-tcpm-rack-03.txt >> Pages : 25 >> Date : 2018-03-05 >> >> Abstract: >> This document presents a new TCP loss detection algorithm called RACK >> ("Recent ACKnowledgment"). RACK uses the notion of time, instead of >> packet or sequence counts, to detect losses, for modern TCP >> implementations that can support per-packet timestamps and the >> selective acknowledgment (SACK) option. It is intended to replace >> the conventional DUPACK threshold approach and its variants, as well >> as other nonstandard approaches. >> >> >> The IETF datatracker status page for this draft is: >> https://datatracker.ietf.org/doc/draft-ietf-tcpm-rack/ >> >> There are also htmlized versions available at: >> https://tools.ietf.org/html/draft-ietf-tcpm-rack-03 >> https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-rack-03 >> >> A diff from the previous version is available at: >> https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rack-03 >> >> >> Please note that it may take a couple of minutes from the time of submission >> until the htmlized version and diff are available at tools.ietf.org. >> >> Internet-Drafts are also available by anonymous FTP at: >> ftp://ftp.ietf.org/internet-drafts/ >> >> _______________________________________________ >> tcpm mailing list >> tcpm@ietf.org >> https://www.ietf.org/mailman/listinfo/tcpm >> >> >> -- >> ________________________________________________________________ >> Bob Briscoe http://bobbriscoe.net/ -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/ From nobody Wed Mar 21 04:32:39 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1BABA124207 for ; Wed, 21 Mar 2018 04:32:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.71 X-Spam-Level: X-Spam-Status: No, score=-2.71 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9kjJ6eKI0Ii7 for ; Wed, 21 Mar 2018 04:32:32 -0700 (PDT) Received: from mail-io0-x232.google.com (mail-io0-x232.google.com [IPv6:2607:f8b0:4001:c06::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4C41112D7F9 for ; Wed, 21 Mar 2018 04:32:32 -0700 (PDT) Received: by mail-io0-x232.google.com with SMTP id e79so6213221ioi.7 for ; Wed, 21 Mar 2018 04:32:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=TEmHlkzvztCW0N4l7jXioLQz7iFOCMfNJR2L17eYKl4=; b=eTDOri+4M0Gohn0WxtOXBsIHV6QuW3VNGdAFM2wzDeZ7oRMUsrnd6NNpHWd0pLgG1r 69iBLxdJpTHs9iIaR5bj1fR9lHXf+u3IQHDgbA6D457wDxOm881JEvS8qS4R1gZZMrtd i8JI/IRlSomnVDiO6UfnKRE1w8ne0qOHGdJ+5syTetOQbyjZzbDgOito4uzhlrCkfvKU 1MnDE3MVkBswkAytYa7BYVvrxfr0bQrC2iMLJb00AwAUfjy7FP2wcvWoUXITIl9YOmZP RPOxBg3YkkC0OUC5Xjki2THUlm4WDGNDLnpIMVf6KGWbkpZDWACBMqoB3j8BD/Zog+6r 8oQg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=TEmHlkzvztCW0N4l7jXioLQz7iFOCMfNJR2L17eYKl4=; b=stzwQ5tfzmA8+pVPHMpZLimzaD1nldufKcSYy/HwktVktYO3cOFzUH/O0zDEDgOpyL oF6AOpC+c/bHKSsxsfuIeW4iXAe+U3Ggt5fTKG9QHiHPQPcmjb6wCwXAPovpeoI85zze Q4QU3a3WQYr+ikmYKhIPd1uSf4Ly5goS7wI6zAv2nmqXyiUD4/bjrWIDWbY8Lrqgkd2m xgtnSio3HKmEr74cadpkLZTGvseSf3MBTyKOBByGbOWuoXZrPyPUW9U4XFXJUcRe0rZd 6HCmndVFiSHGj7cam7o/rxrkvl6sZmgaPdJXCGkNxDVpKaQmdcBDgl5mbo6a22MYIAlw Sykw== X-Gm-Message-State: AElRT7EXYHvEG8gOjHT3BQwlV+gAcbwsKMaV4oBeTZNbm8F7vGhNUXsW oM9uw03ABKBqLRPWyrf+8viH0rMvccK/h+CtemFcjg== X-Google-Smtp-Source: AG47ELtsXlUPlypTOQgMbMri2anMC7Dxok/8fukdAnq9WbyYLNJTYiOWk0wLPWm8DGQUoz6wgCA1Ec5eY7LHQ1Cw1+E= X-Received: by 10.107.182.67 with SMTP id g64mr21306769iof.58.1521631950968; Wed, 21 Mar 2018 04:32:30 -0700 (PDT) MIME-Version: 1.0 Received: by 10.107.138.29 with HTTP; Wed, 21 Mar 2018 04:31:50 -0700 (PDT) In-Reply-To: <1c5bef94-eb4f-7aab-0b6b-cb2d02da7a9a@bobbriscoe.net> References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <1c5bef94-eb4f-7aab-0b6b-cb2d02da7a9a@bobbriscoe.net> From: Yuchung Cheng Date: Wed, 21 Mar 2018 04:31:50 -0700 Message-ID: To: Bob Briscoe Cc: draft-ietf-tcpm-rack@tools.ietf.org, "tcpm@ietf.org Extensions" Content-Type: text/plain; charset="UTF-8" Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Mar 2018 11:32:37 -0000 On Wed, Mar 21, 2018 at 3:51 AM, Bob Briscoe wrote: > Yuchung, > > Thanks. I understand all this. > Responses inline... > > > On 21/03/18 10:23, Yuchung Cheng wrote: >> >> On Tue, Mar 20, 2018 at 11:21 AM, Bob Briscoe wrote: >>> >>> Yuchung, >>> >>> What I was trying to say at the tcpm mic just now. >>> This could be considered as a first draft of the text you asked me to >>> write... >>> >>> The Bigger Picture >>> >>> The reordering degree of a link is not a constant. It evolves (over >>> years) >>> dependent on TCP. >>> >>> From a link designers viewpoint, parallelizing (eg. link bonding) is the >>> easiest way to get their link to go faster >>> >>> So their main constraint on speed is reordering and there is huge >>> pressure >>> on them to relax that constraint >>> The /only/ thing that is holding them back from introducing more >>> reordering >>> is the 3 dupacks in TCP or the RTT/4 rule in RACK-02 >>> >>> It is likely RACK will become widespread >>> Given RACK-03 now adapts to the reordering window, link designers will >>> introduce more reordering >>> That is GOOD (virtuous circle), but only up to a point (vicious circle). >>> >>> We need to write down what that point is >>> >>> We need to ensure the algorithm stops adapting at that point. >>> >>> Put in IETF process terms, the draft needs to state the WG's consensus of >>> what the goal of the experiment is. Otherwise: >>> >>> we can't judge whether the experiment has succeeded. >>> we can't invent alternative algorithms to better reach the goal. >>> >>> TCP Specifics: >>> >>> TCP cannot tell immediately whether a hole is reordering or loss. >>> It only knows in hindsight (if the hole gets filled later). >>> >>> It is good (up to a point) to allow more reordering in the network, and >>> repair the reordering within the receive buffer instead. >>> It is also good (up to a point) for TCP to be able to deem that a loss >>> has >>> occurred as quickly as possible. >>> >>> However, >>> >>> the longer the reordering window, the longer it takes to repair losses >>> the faster loss is repaired, the more spurious retransmissions >>> >>> These two represent a trade-off between latency and bandwidth efficiency. >>> >>> Given the reordering window could evolve to grow without bound (see 'the >>> bigger picture'),... >>> ...Where is the best trade-off point? >>> >>> What assumption about the answer to this problem did you make when >>> designing >>> the algo in RACK-03? >> >> Thank you. I agree we need to clarify the degree of reordering window >> TCP should/would tolerate. > > You say TCP "should/would". From your response below, it looks like an > answer is already in the RACK code. > >> >> We designed RACK based on studying the current traces we collected at >> Google. I see largely three kinds of reordering: >> 1) router parallelism. key symptom: the sub-MSS packet in the end of a >> window burst arrives first. the rest follows in order. e.g. >> P10,P1,P2,...P9. the reordering degree << min-RTT (except low BW) >> 2) wireless retransmission/burst at first/last hop: notably 802.11n >> block ACK may cause out-of-order delivery of TCP packets. Despite a >> reordering buffer is mandated in the spec, not all drivers implement >> that. symptom: random permutation of delivery but the degree in time >> is usually within the estimated RTT (e.g. SRTT) at the time of >> reordering. >> 3) the path is significantly shorten'd due to traffic engineering - >> the reordering degree is unbounded but happens infrequently (i.e. once >> many RTTs). >> >> [not observed but a bonus feature] >> 4) flowlet: ECMP is universally deployed. but being able to tolerate >> small degree of reordering enables flowlet idea for better >> load-balacning in some cases. That is an elephant flow may use >> "slightly different" path at times. >> >> We want TCP to accommodate small-degree but frequent reordering >> introduced (i.e. within a round trip) in (1)(2)(4). Therefore RACK >> reordering window is cap'd to SRTT. Theoretically max_RTT makes more >> sense but we're concerned of bufferbloat. > > "Theoretically"? What theory? This is a tradeoff between bandwidth > efficiency and latency. So why is the answer only related to RTT? > > I think you mean "practically" rather than "theoretically". IOW, the > implementation is constrained by a separate tradeoff that makes it hard to > work at all, if you wait >SRTT. > > But that nearly doubles the time before loss recovery starts (assuming link > designers eventually make reordering degree expand to fill the space > available). I think most apps would be happier with some more spurious > retransmissions but faster recovery. > >> >> Although maintaining reordering within an RTT is difficult for route >> designers as they don't want to or can't know RTT. 3 DUPACKs is easier >> to implement. We're open to wide discussion about this design point -- >> although it might be better to have a separate draft on this aspect >> (similar to Joe's comments) --- and RACK is only one recovery >> mechanism that honors the guidelines. > > I think different applications will have different answers - but I suspect > we could make a guess in TCP and not need a socket option. > > However, it's important not to punt difficult but important questions. > It's not safe for tcpm to let you drive this car, if no-one has a clue where > the brake is. RACK reo_wnd max is SRTT --> I am open to discuss alternatives but not under such offensive tone. How is this punting? I merely meant "how TCP should handle reordering" may be out-of-scope of a specific loss recovery mechanism -- RACK is not the only one and would not be the last one. RACK can not become an RFC w/o consensus no matter what I ask the chairs to moderate. > > > Bob > > > > > Bob > >> >> >>> >>> >>> Bob >>> >>> On 05/03/18 23:11, internet-drafts@ietf.org wrote: >>> >>> A New Internet-Draft is available from the on-line Internet-Drafts >>> directories. >>> This draft is a work item of the TCP Maintenance and Minor Extensions WG >>> of >>> the IETF. >>> >>> Title : RACK: a time-based fast loss detection >>> algorithm >>> for TCP >>> Authors : Yuchung Cheng >>> Neal Cardwell >>> Nandita Dukkipati >>> Priyaranjan Jha >>> Filename : draft-ietf-tcpm-rack-03.txt >>> Pages : 25 >>> Date : 2018-03-05 >>> >>> Abstract: >>> This document presents a new TCP loss detection algorithm called RACK >>> ("Recent ACKnowledgment"). RACK uses the notion of time, instead of >>> packet or sequence counts, to detect losses, for modern TCP >>> implementations that can support per-packet timestamps and the >>> selective acknowledgment (SACK) option. It is intended to replace >>> the conventional DUPACK threshold approach and its variants, as well >>> as other nonstandard approaches. >>> >>> >>> The IETF datatracker status page for this draft is: >>> https://datatracker.ietf.org/doc/draft-ietf-tcpm-rack/ >>> >>> There are also htmlized versions available at: >>> https://tools.ietf.org/html/draft-ietf-tcpm-rack-03 >>> https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-rack-03 >>> >>> A diff from the previous version is available at: >>> https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rack-03 >>> >>> >>> Please note that it may take a couple of minutes from the time of >>> submission >>> until the htmlized version and diff are available at tools.ietf.org. >>> >>> Internet-Drafts are also available by anonymous FTP at: >>> ftp://ftp.ietf.org/internet-drafts/ >>> >>> _______________________________________________ >>> tcpm mailing list >>> tcpm@ietf.org >>> https://www.ietf.org/mailman/listinfo/tcpm >>> >>> >>> -- >>> ________________________________________________________________ >>> Bob Briscoe http://bobbriscoe.net/ > > > -- > ________________________________________________________________ > Bob Briscoe http://bobbriscoe.net/ > From nobody Wed Mar 21 04:50:11 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CAEE512D7F9 for ; Wed, 21 Mar 2018 04:50:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.71 X-Spam-Level: X-Spam-Status: No, score=-2.71 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HHl58UPDv-rH for ; Wed, 21 Mar 2018 04:50:06 -0700 (PDT) Received: from mail-io0-x22d.google.com (mail-io0-x22d.google.com [IPv6:2607:f8b0:4001:c06::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1C056126DD9 for ; Wed, 21 Mar 2018 04:50:06 -0700 (PDT) Received: by mail-io0-x22d.google.com with SMTP id b20so6296776iof.5 for ; Wed, 21 Mar 2018 04:50:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=CG4ISD45T07+57YmgN4W9XROkQNWP87LPjlqmJOJq10=; b=P9Ft8jRQG+XQhBvdS7W3MwA13RJsGDG84OQuHkEXZL46IUT5siFrumBh6/nXwEaIxE c6xANzr7Qb5MUmRPnaP9+kzKX17Tud0QMRxtNf38YOcbadzvvTPZYbNTCARvupmvXdgk YgkRBeATe3TjYDvArzfL2FS3cIce1ytT2nq2SUYS5NGqg+Otk7hGTY/igO3zQAgGWrgw RaIumEZzQrcNPjXpTe7BiMGSEZNHN728mXupUlofzNnzuTDe1dFAzSHaKx0UdxMiFpP7 4c3N+bHYvlMKBVpnTglGvEAb6dr7CMk44c/JKnrzLK5tw3g8iT63BVvQEpNl6XZA3YU3 30Lg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=CG4ISD45T07+57YmgN4W9XROkQNWP87LPjlqmJOJq10=; b=StZK+mV8+5tWDqd6MG/xegQiQe7+uouLV8J/hQ3KwyFqHBdayiYn0oYG0ZYHNBfXhy aKgvniFPiNDAb54mBO5bw/fQgtaNZY/AJyQiscdGK3dg13LSzOGxvjKBcv29hMgIXSqR u4z/5iRnGew/IfpGtKWpF/kqHrX/peVnBOAOq/IGMbGPAHKuGEl2QPOFknQv7DQk65Iq CU9Gmm6yMhl3C1yyZQYagoda5AghDGoSNicWQQl8HmYm9YZHfIJU0DoltmgpgMRhvGBw jxMH8EhdT10KptdkRIVc8UUNW5q7oxMtUgNrmKu6ld5OrvFeZ3qFaKuGlVhNUSrO9QMf xwwQ== X-Gm-Message-State: AElRT7ESSMy2nr3h3BGbejpbbZNkav4+50vBjL57jeiZALhX+FlMAv8L kLkghECzeEG69Ep77rC474dh89RRkC7shfOfJQ8bNA== X-Google-Smtp-Source: AG47ELu0vL2xnrQJ36vXsAZRK4gLm1N+ItKiDYAhRW4Af5Xn5dI9ydNIm6yWYHl3m7B2VMDVDsssAj/HdpfxwCJHDPs= X-Received: by 10.107.182.67 with SMTP id g64mr21369768iof.58.1521633004687; Wed, 21 Mar 2018 04:50:04 -0700 (PDT) MIME-Version: 1.0 Received: by 10.107.138.29 with HTTP; Wed, 21 Mar 2018 04:49:23 -0700 (PDT) In-Reply-To: References: From: Yuchung Cheng Date: Wed, 21 Mar 2018 04:49:23 -0700 Message-ID: To: Richard Scheffenegger Cc: Bob Briscoe , "tcpm@ietf.org Extensions" , draft-ietf-tcpm-rack@tools.ietf.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Mar 2018 11:50:10 -0000 On Wed, Mar 21, 2018 at 3:46 AM, wrote: > Bob, Yuchung, Group, > > Looking below L3 ECMP, another interesting aspect of relaxing the strict = in-order delivery requirement made possible with this work might be environ= ments with limited capabilities to do stochastic flow-based load-balancing = across multiple links, e.g. Ethernet LACP, while only very few TCP sessions= cross that logical link, like what you find in a typical commercial enterp= rise environment. > > Allowing round-robin load-balancing across links which have link latency = differences beyond the skew buffer (e.g. 40G vs 4x 10G LACP) can result in = more effective bandwidth on such L2 technologies... > > However, I'm of split opinion on this relaxation of the strict in-order d= elivery requirment. > > Bandwidth can be improved - in particular with situations as mentioned ab= ove - but I'm concernd that the effective delivery latency might get worse = (more processing overhead in the receiver, to get the data in-order)? Or is= that concern misplaced? > > One datapoint I would like to see would be a comparison of the receiving = tcp stack cpu cost, comparing persistent, heavy reordering at around 1/2 RT= T at the same sender bandwidth as a "proper" in-order delivered datastream.= .. That's a great point: extreme reordering (e.g. packet spray) today can cause severe CPU impact beyond protocol reactions --> extreme reordering would effectively disable GRO --> TCP receiver is forced to process packets in MTU unit --> TCP receiver sends far more ACKs (GRO produces stretched ACKs) --> TCP sender is overloaded with ACKs acking MSS-worth of bytes a time On high speed networks (>1Gbps) with Linux, the CPU impact is far more severe than protocol reactions (e.g. RACK or not) that bottlenecks the throughput In general it'd be good to maintain TSO/GRO efficiency when constructing flowlets, IMO. There is a nice work in SIGCOMM 2015 https://conferences.sigcomm.org/sigcomm/2015/pdf/papers/p465.pdf > > Best regards, > Richard > > > --- > Ich habe diese Nachricht mit der GMX Mail App f=C3=BCr Windows erstellt. > > -----Urspr=C3=BCngliche Nachricht----- > Von: "Yuchung Cheng" > Gesendet: Mittwoch, 21. M=C3=A4rz 2018 10:23 > An: "Bob Briscoe" > Cc: "tcpm@ietf.org Extensions" ; draft-ietf-tcpm-rack@tool= s.ietf.org > Betreff: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering windo= w to reordering degree > > On Tue, Mar 20, 2018 at 11:21 AM, Bob Briscoe wrote= : >> Yuchung, >> >> What I was trying to say at the tcpm mic just now. >> This could be considered as a first draft of the text you asked me to >> write... >> >> The Bigger Picture >> >> The reordering degree of a link is not a constant. It evolves (over year= s) >> dependent on TCP. >> >> From a link designers viewpoint, parallelizing (eg. link bonding) is the >> easiest way to get their link to go faster >> >> So their main constraint on speed is reordering and there is huge pressu= re >> on them to relax that constraint >> The /only/ thing that is holding them back from introducing more reorder= ing >> is the 3 dupacks in TCP or the RTT/4 rule in RACK-02 >> >> It is likely RACK will become widespread >> Given RACK-03 now adapts to the reordering window, link designers will >> introduce more reordering >> That is GOOD (virtuous circle), but only up to a point (vicious circle). >> >> We need to write down what that point is >> >> We need to ensure the algorithm stops adapting at that point. >> >> Put in IETF process terms, the draft needs to state the WG's consensus o= f >> what the goal of the experiment is. Otherwise: >> >> we can't judge whether the experiment has succeeded. >> we can't invent alternative algorithms to better reach the goal. >> >> TCP Specifics: >> >> TCP cannot tell immediately whether a hole is reordering or loss. >> It only knows in hindsight (if the hole gets filled later). >> >> It is good (up to a point) to allow more reordering in the network, and >> repair the reordering within the receive buffer instead. >> It is also good (up to a point) for TCP to be able to deem that a loss h= as >> occurred as quickly as possible. >> >> However, >> >> the longer the reordering window, the longer it takes to repair losses >> the faster loss is repaired, the more spurious retransmissions >> >> These two represent a trade-off between latency and bandwidth efficiency= . >> >> Given the reordering window could evolve to grow without bound (see 'the >> bigger picture'),... >> ...Where is the best trade-off point? >> >> What assumption about the answer to this problem did you make when desig= ning >> the algo in RACK-03? > Thank you. I agree we need to clarify the degree of reordering window > TCP should/would tolerate. > > We designed RACK based on studying the current traces we collected at > Google. I see largely three kinds of reordering: > 1) router parallelism. key symptom: the sub-MSS packet in the end of a > window burst arrives first. the rest follows in order. e.g. > P10,P1,P2,...P9. the reordering degree << min-RTT (except low BW) > 2) wireless retransmission/burst at first/last hop: notably 802.11n > block ACK may cause out-of-order delivery of TCP packets. Despite a > reordering buffer is mandated in the spec, not all drivers implement > that. symptom: random permutation of delivery but the degree in time > is usually within the estimated RTT (e.g. SRTT) at the time of > reordering. > 3) the path is significantly shorten'd due to traffic engineering - > the reordering degree is unbounded but happens infrequently (i.e. once > many RTTs). > > [not observed but a bonus feature] > 4) flowlet: ECMP is universally deployed. but being able to tolerate > small degree of reordering enables flowlet idea for better > load-balacning in some cases. That is an elephant flow may use > "slightly different" path at times. > > We want TCP to accommodate small-degree but frequent reordering > introduced (i.e. within a round trip) in (1)(2)(4). Therefore RACK > reordering window is cap'd to SRTT. Theoretically max_RTT makes more > sense but we're concerned of bufferbloat. > > Although maintaining reordering within an RTT is difficult for route > designers as they don't want to or can't know RTT. 3 DUPACKs is easier > to implement. We're open to wide discussion about this design point -- > although it might be better to have a separate draft on this aspect > (similar to Joe's comments) --- and RACK is only one recovery > mechanism that honors the guidelines. > > >> >> >> >> Bob >> >> On 05/03/18 23:11, internet-drafts@ietf.org wrote: >> >> A New Internet-Draft is available from the on-line Internet-Drafts >> directories. >> This draft is a work item of the TCP Maintenance and Minor Extensions WG= of >> the IETF. >> >> Title : RACK: a time-based fast loss detection algorit= hm >> for TCP >> Authors : Yuchung Cheng >> Neal Cardwell >> Nandita Dukkipati >> Priyaranjan Jha >> Filename : draft-ietf-tcpm-rack-03.txt >> Pages : 25 >> Date : 2018-03-05 >> >> Abstract: >> This document presents a new TCP loss detection algorithm called RACK >> ("Recent ACKnowledgment"). RACK uses the notion of time, instead of >> packet or sequence counts, to detect losses, for modern TCP >> implementations that can support per-packet timestamps and the >> selective acknowledgment (SACK) option. It is intended to replace >> the conventional DUPACK threshold approach and its variants, as well >> as other nonstandard approaches. >> >> >> The IETF datatracker status page for this draft is: >> https://datatracker.ietf.org/doc/draft-ietf-tcpm-rack/ >> >> There are also htmlized versions available at: >> https://tools.ietf.org/html/draft-ietf-tcpm-rack-03 >> https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-rack-03 >> >> A diff from the previous version is available at: >> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-tcpm-rack-03 >> >> >> Please note that it may take a couple of minutes from the time of submis= sion >> until the htmlized version and diff are available at tools.ietf.org. >> >> Internet-Drafts are also available by anonymous FTP at: >> ftp://ftp.ietf.org/internet-drafts/ >> >> _______________________________________________ >> tcpm mailing list >> tcpm@ietf.org >> https://www.ietf.org/mailman/listinfo/tcpm >> >> >> -- >> ________________________________________________________________ >> Bob Briscoe http://bobbriscoe.net/ > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm From nobody Wed Mar 21 05:17:58 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D86FC12D7F9 for ; Wed, 21 Mar 2018 05:17:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ChQY3W6RLaCB for ; Wed, 21 Mar 2018 05:17:55 -0700 (PDT) Received: from mout.gmx.net (mout.gmx.net [212.227.15.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 174C8126D0C for ; Wed, 21 Mar 2018 05:17:53 -0700 (PDT) Received: from [31.133.142.122] ([31.133.142.122]) by msvc-mesg-gmx121.server.lan (via HTTP); Wed, 21 Mar 2018 13:17:07 +0100 MIME-Version: 1.0 Message-ID: From: rs.ietf@gmx.at To: ycheng@google.com Cc: ietf@bobbriscoe.net, tcpm@ietf.org, draft-ietf-tcpm-rack@tools.ietf.org Content-Type: text/plain; charset=UTF-8 Importance: normal Date: Wed, 21 Mar 2018 13:17:07 +0100 X-Priority: 3 X-Provags-ID: V03:K1:t4QlkgpOQAZ8+iwxi2ZbVpz2do/wEtlqaE9w0c42LUM QiYjAtgXcC6HsOoVmLXiAa7d1+KW8MgNe1THmErtJIyV5jfQAg qeHuOU53J+nBv+z7NiZyDXJ7FdH238Vz2MKOVHfeJpsUXO0WB0 bR1BTzfZn1wwC0Acj4Ws09QBILSq/40Z7CR6BTyGiNfB+Wm8xH afTBljir1VzIB0m6NDhEozTA7S8YIn+ehzunfADhlqGKR45TfK 4jsnOoRNZS/uvru/C5DDLjCoF5QSXLivF8z6TEMPrgOrphwIqI ftXTV0nTYeRRa2BlyhKMpnxMg5m X-UI-Out-Filterresults: notjunk:1;V01:K0:iAG4yn79CAg=:OWPyAGwoN4uR6PivBSSTj9 02W/bAERyo0V1JYaYs6bfRoT5J3c7u0JufgHXUzyr3kp3Ma/QoPWf6TTTP6+Nc+WUbe7vOCvB 9g/i6qvFFhKQzdMv9TZGcUn8pnSWJW/aasyk8KogrEdrSOyLY1Q9BE521dr0atPbr6e3ADNf7 3k6feoI/34kW7udyjDY0fe05SZ7y2H83cxIRvjs4jn65CnJ2EMcVIXW0eTue4+dUBHRTMliYb Q5ayf5z+4wwil3J4bLHaZJSe4Z35zr6WRamDNqQzaqf/+xTKDYlrDYFNvqAl2ei0051RevlVj /dfme1Kk4zoYkKL6/uqvBaMvJOikePbWTRO5Di+J1yLBtnAQNAN+AWAIlVvzjV/3qF/Ye6DbR 5Um/8zeghvOFuBmKHCyxl6mOYYMW6M/DzIoXJBt8aAZPr3WTrwa6mo7TGZ2xjlmDqzR32azV8 9tdVLh6JT/q1WU2Yp25jTNS8CMJ+FoKxtMHFfF7XZ82Rn9N0PJdpc0b3CpyrITEdi5L9RNXSm aWXygJP7EpzAyc/IyyAPQ4= Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Mar 2018 12:17:57 -0000 >> >> One datapoint I would like to see would be a comparison of >> the receiving tcp stack cpu cost, comparing persistent, heavy >> reordering at around 1/2 RTT at the same sender bandwidth >> as a "proper" in-order delivered datastream... >That's a great point: extreme reordering (e.g. packet spray) today > can cause severe CPU impact beyond protocol reactions > > --> extreme reordering would effectively disable GRO > --> TCP receiver is forced to process packets in MTU unit > --> TCP receiver sends far more ACKs (GRO produces stretched ACKs) But would it need to? At high speeds, adjusting the GRO/LRO driver to coalesce more packets before sending them up for processing might be a easy mitigation, but would add a bit of latency (10..100 usec). However, the reduction of CPU overhead as you described would probably be worth it. > --> TCP sender is overloaded with ACKs acking MSS-worth of bytes a time > > On high speed networks (>1Gbps) with Linux, the CPU impact is far > more severe than protocol reactions (e.g. RACK or not) that bottlenecks > the throughput > > In general it'd be good to maintain TSO/GRO efficiency when > constructing flowlets, IMO. There is a nice work in SIGCOMM 2015 > https://conferences.sigcomm.org/sigcomm/2015/pdf/papers/p465.pdf Thanks for the pointer. Richard From nobody Thu Mar 22 00:47:36 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A852312D7F6; Thu, 22 Mar 2018 00:47:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=nokia.onmicrosoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GqzoN7Hc3DJs; Thu, 22 Mar 2018 00:47:32 -0700 (PDT) Received: from EUR01-HE1-obe.outbound.protection.outlook.com (mail-he1eur01on0122.outbound.protection.outlook.com [104.47.0.122]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 085221201F8; 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boundary="_000_AM5PR0701MB25475E93B55AC8B5049FF84593A90AM5PR0701MB2547_" MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-Network-Message-Id: e99c4605-3658-4ecb-d717-08d58fc929e4 X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Mar 2018 07:47:29.5033 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0701MB2961 Archived-At: Subject: [tcpm] IETF 101 TCPM draft minutes X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Mar 2018 07:47:35 -0000 --_000_AM5PR0701MB25475E93B55AC8B5049FF84593A90AM5PR0701MB2547_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Draft minutes can be found at https://datatracker.ietf.org/meeting/101/mate= rials/minutes-101-tcpm-00 Please let me know if there are any omissions. Many thanks to Gorry as our extremely reliable mumbling-to-text converter! Michael --_000_AM5PR0701MB25475E93B55AC8B5049FF84593A90AM5PR0701MB2547_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Draft minutes can be found at https://datatracker.ietf.org/meeting/101/materials/minutes-101-tcpm-00<= o:p>

 

Please let me know if there are any omissions.<= /o:p>

 

Many thanks to Gorry as our extremely reliable mumbl= ing-to-text converter!

 

Michael

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Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Mar 2018 11:00:11 -0000 Hi With reference to #2. We have a similar issue in 5G where for instance LTE = and NR is used in Dual Connectivity arrangements where : 1) The RTT over the NR leg is shorter than the RTT for the LTE leg.=20 2) Data can be delayed an additional time on one leg because of retransmiss= ions on the MAC and RLC layer. We posted the following document a while ago (it was however not accepted).= In short the proposed arrangement is that some mild reordering (say 10ms) = is sorted out by the 5G protocol stack but beyond that the packets are forw= arded out of order. http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_98/Docs/R2-1705318.zip =20 /Ingemar >=20 > Message: 3 > Date: Wed, 21 Mar 2018 03:23:31 -0700 > From: Yuchung Cheng > To: Bob Briscoe > Cc: draft-ietf-tcpm-rack@tools.ietf.org, "tcpm@ietf.org Extensions" > > Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering > window to reordering degree > Message-ID: > ail.gmail.com> > Content-Type: text/plain; charset=3D"UTF-8" >=20 > On Tue, Mar 20, 2018 at 11:21 AM, Bob Briscoe Snip snip.... >=20 > We designed RACK based on studying the current traces we collected at > Google. I see largely three kinds of reordering: > 1) router parallelism. key symptom: the sub-MSS packet in the end of a > window burst arrives first. the rest follows in order. e.g. > P10,P1,P2,...P9. the reordering degree << min-RTT (except low BW) > 2) wireless retransmission/burst at first/last hop: notably 802.11n block= ACK > may cause out-of-order delivery of TCP packets. Despite a reordering buff= er > is mandated in the spec, not all drivers implement that. symptom: random > permutation of delivery but the degree in time is usually within the > estimated RTT (e.g. SRTT) at the time of reordering. > 3) the path is significantly shorten'd due to traffic engineering - the > reordering degree is unbounded but happens infrequently (i.e. once many > RTTs). >=20 From nobody Thu Mar 22 12:49:14 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D7CB8126C3D for ; Thu, 22 Mar 2018 12:49:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=tessares-net.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1oXPKDIyAlYF for ; Thu, 22 Mar 2018 12:49:10 -0700 (PDT) Received: from mail-wm0-x232.google.com (mail-wm0-x232.google.com [IPv6:2a00:1450:400c:c09::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 231C3120726 for ; Thu, 22 Mar 2018 12:49:10 -0700 (PDT) Received: by mail-wm0-x232.google.com with SMTP id f125so18241689wme.4 for ; Thu, 22 Mar 2018 12:49:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tessares-net.20150623.gappssmtp.com; s=20150623; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=CdabOn3+EuQkssTqf7co9LUrzATL6aeBZz+hWLyINlM=; b=nrh1GrBMlHaobrkYLWpRii9F87hE982jk7YXAj7Eed70qWcDkO6QV7YvqmkugoXj3G Dk8RdQpo/HSU5+bN8RmxB2beSfZw9DqxB1YpOhBc4Z1G7Jr7EpiayecT/DBrFjL3SxeP LDuM0Nycm2fbItyBsRHFfNBN3pqy0pa+W1xxqOL2gjDLKNT9p7KJwL3IP2QAMOdprDdS L9UK9bW/aqur9uzF4MIBmeSBuVX4XLqgBHQo/iytj8dNPqy5jzD6EW3UvsTUaCXuzGR5 YGrapeDCFUOdnV3asvtUzHEVkIbTHy8vBg3qWssengLesd1eCeooi+IIIXVrLiLbFPcs qUig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=CdabOn3+EuQkssTqf7co9LUrzATL6aeBZz+hWLyINlM=; b=q+SsPNGpEo6mxjj2EGJrEHj13rtWqfrJEB5LmaGZ36K0QKMAeOPs+K35qUu6xaoeDj 03C3SnNRtVw05WhaVuMMHawQOm8m2YuUOF8fQIvk4goV04DDzr1r3M0CF4KzvHSP66Ij 2WQ5X7ic/b+iqoMNMw8bSfQ4SxP9SQNjyQlksymuDnLg+2bYfWOtnTH6O+PQbDW8aBc+ 0SxiFhjVGbz5QnQz6P03Q3+HD77ZEOMXaG1EMm8fsx2wLnUqwvGdMVwrL7hAb1xOOQx4 74TiUCVCvIeOcHBtmYixMRA2zhWt/ID4GFbxEi8zs0sn1ttd4LiFtR8yeiIvAlnPDzDD WbyA== X-Gm-Message-State: AElRT7HZ+JbOIb6yU7ktxdRXvJJ1UnQ/GP8x25axOpqGZn9hIXPjX4lU Df4Y2GL0n8MCWpWqz+jTkp2gvcBpfNeVekzxWeSKHN/DGSU8UVY8E998Fx4hJ7bBGmKnY/ZY X-Google-Smtp-Source: AG47ELu5CiL8c7RSTd1EZyVMU1LHjVVBE9DW4VfkufdqbjiElBXGjKOWY8xppABiiRkN9xtk4C10/g== X-Received: by 10.28.236.145 with SMTP id h17mr6153878wmi.43.1521748148462; Thu, 22 Mar 2018 12:49:08 -0700 (PDT) Received: from [192.168.12.123] ([82.113.183.179]) by smtp.gmail.com with ESMTPSA id d48sm12334840wrd.12.2018.03.22.12.48.55 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 22 Mar 2018 12:49:07 -0700 (PDT) From: Olivier Bonaventure Message-Id: <284E217A-4A12-4EC1-A9C6-52B6FFF67FFD@tessares.net> Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) Date: Thu, 22 Mar 2018 20:47:50 +0100 In-Reply-To: Cc: Yuchung Cheng , tcpm@ietf.org, draft-ietf-tcpm-rack@tools.ietf.org To: Bob Briscoe References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> X-Mailer: Apple Mail (2.3445.5.20) Content-Type: multipart/alternative; boundary="Apple-Mail=_98FAC3E4-C57A-4E44-A245-09134C4141BF" Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Mar 2018 19:49:13 -0000 --Apple-Mail=_98FAC3E4-C57A-4E44-A245-09134C4141BF Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="ISO-8859-1" Bob, > What I was trying to say at the tcpm mic just now. > This could be considered as a first draft of the text you asked me to wri= te... > The Bigger Picture >=20 > The reordering degree of a link is not a constant. It evolves (over years= ) dependent on TCP. > From a link designers viewpoint, parallelizing (eg. link bonding) is the = easiest way to get their link to go faster > So their main constraint on speed is reordering and there is huge pressur= e on them to relax that constraint > The /only/ thing that is holding them back from introducing more reorderi= ng is the 3 dupacks in TCP or the RTT/4 rule in RACK-02 > It is likely RACK will become widespread > Given RACK-03 now adapts to the reordering window, link designers will in= troduce more reordering > That is GOOD (virtuous circle), but only up to a point (vicious circle). > We need to write down what that point is > We need to ensure the algorithm stops adapting at that point. I agree that parallelising is a nice way to expand the capacity of links, t= ypically in the access. However, link designers should not assume that they= can parallelise whatever they want and let TCP figure out what is happenin= g and solve any issue. If TCP packets are sent over two parallel links that have similar character= istic, then it should work fine. However, as soon as one of these links has= different characteristics (in terms of delay, bandwidth, congestion, packe= t losses), TCP will have difficulties to understand what is happening in th= e network if it cannot know which packet is sent over which link. A better = approach when bonding access links is to expose them to a multipath capable= transport layer and let it figure out the characteristics of the different= links and use them efficiently. With IPv6, access link designers have the = ability to expose multiple addresses to the endhosts and we should encourag= e this behaviour when those addresses correspond to links with different ch= aracteristics Olivier --=20 ------------------------------ DISCLAIMER. This email and any files transmitted with it are confidential and intended= =20 solely for the use of the individual or entity to whom they are addressed.= =20 If you have received this email in error please notify the system manager.= =20 This message contains confidential information and is intended only for the= =20 individual named. If you are not the named addressee you should not=20 disseminate, distribute or copy this e-mail. Please notify the sender=20 immediately by e-mail if you have received this e-mail by mistake and=20 delete this e-mail from your system. If you are not the intended recipient= =20 you are notified that disclosing, copying, distributing or taking any=20 action in reliance on the contents of this information is strictly=20 prohibited. --Apple-Mail=_98FAC3E4-C57A-4E44-A245-09134C4141BF Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="ISO-8859-1" Bob,
=20 What I was trying to say at the tcpm mic just now.
This could be considered as a first draft of the text you asked me to write...

The Bigger Picture

The reordering degree of a link is not a constant. It evolves (over years) dependent on TCP.
  • From a link designers viewpoint, parallelizing (eg. li= nk bonding) is the easiest way to get their link to go faster
    • So their main constraint on speed is reordering and = there is huge pressure on them to relax that constraint
    • The /only/ thing that is holding them back from intr= oducing more reordering is the 3 dupacks in TCP or the RTT/4 rule in RACK-02
  • It is likely RACK will become widespread
  • Given RACK-03 now adapts to the reordering window, lin= k designers will introduce more reordering
  • That is GOOD (virtuous circle), but only up to a point (vicious circle).
    • We need to write down what that point is
    • We need to ensure the algorithm stops adapting at th= at point.

I agree that pa= rallelising is a nice way to expand the capacity of links, typically in the= access. However, link designers should not assume that they can parallelis= e whatever they want and let TCP figure out what is happening and solve any= issue.

If TCP packets are sent over tw= o parallel links that have similar characteristic, then it should work fine= . However, as soon as one of these links has different characteristics (in = terms of delay, bandwidth, congestion, packet losses), TCP will have diffic= ulties to understand what is happening in the network if it cannot know whi= ch packet is sent over which link. A better approach when bonding access li= nks is to expose them to a multipath capable transport layer and let it fig= ure out the characteristics of the different links and use them efficiently= . With IPv6, access link designers have the ability to expose multiple addr= esses to the endhosts and we should encourage this behaviour when those add= resses correspond to links with different characteristics
<= br class=3D"">

Olivier


DISCLAIMER.
This email and any files transmitted with it are confidential an= d intended solely for the use of the individual or entity to whom they are = addressed. If you have received this email in error please notify the syste= m manager. This message contains confidential information and is intended o= nly for the individual named. If you are not the named addressee you should= not disseminate, distribute or copy this e-mail. Please notify the sender = immediately by e-mail if you have received this e-mail by mistake and delet= e this e-mail from your system. If you are not the intended recipient you a= re notified that disclosing, copying, distributing or taking any action in = reliance on the contents of this information is strictly prohibited.= --Apple-Mail=_98FAC3E4-C57A-4E44-A245-09134C4141BF-- From nobody Sun Mar 25 04:36:31 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6829B127871 for ; Sun, 25 Mar 2018 04:36:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.45 X-Spam-Level: X-Spam-Status: No, score=-2.45 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id A68m_0vd1YHq for ; Sun, 25 Mar 2018 04:36:29 -0700 (PDT) Received: from mail-oi0-x231.google.com (mail-oi0-x231.google.com [IPv6:2607:f8b0:4003:c06::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6CB99127599 for ; Sun, 25 Mar 2018 04:36:29 -0700 (PDT) Received: by mail-oi0-x231.google.com with SMTP id q71-v6so13819813oic.6 for ; Sun, 25 Mar 2018 04:36:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=txoqydAJKkKTg9Wz6vpIWWd0AY+CF53/dQxnycltLb0=; b=rP7k0VvFhWu8A6KWtgJbS2KLLbXMK95DvOBRxA0QjgkhdTGEjVs554C7TwDBn/qQJU mHGVRRAxYZFYhHfGkRaAioSEi0M82h1JsgDZ26HDLraxptWJPxEnDaZyrbr0a9bW0Es7 F9pFnMMxsL2oVWCADqWVCF2XWFr+uO7b+ytsBIqUC55pdzMzcDaO08mKd9fIKi64Zik9 fwGrLxmBUtvP8aG9mmDzCR3P34WJzVati20Q3uhrykoZ2ljjTnkTn+YamHDhRYl/uKc6 csMkP8Tn8yY2fmKXiKkYDU1bGR/s74GTU9JW6E3HbLJWxxkmUvaM9qhRo+v3sCQqKDzu HMBQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=txoqydAJKkKTg9Wz6vpIWWd0AY+CF53/dQxnycltLb0=; b=W3yUi5aP5MGF11DAjkzGWnx7lm7y06EvzMdsHSmCXroBwF7Q5pkAosSaxbL/MciAOb xHqTcaXsxkNvaIdeS40W85Caf0ADUmiQtyQpz76k4TA9CDuzQi8FK8+hHmTHtev2ul+L Vj1B/H9FS1gNlBQEgBHAUN23T8daMGERcsnqFdOvwQE64bD3YYtMInwB7TyIySE+5g/F bMo317KMSt+oa7nxLL1jDjxZF0r6L8UVvqJYRhsYNnU/i9xoi44g57JAn2U7Lvyj0Syu 9POUhlNRUNHGLjwShZZQm7t94t90dsd83RfKjksiU6ObmDb8ZtTIYPHziSYNz94iXWBF 97HA== X-Gm-Message-State: AElRT7EQ1o8Ra0lze3y6fYQI1aAYB1X66Vcc2Hsu0uygROHA8wm06ZB3 6XbpLqBayNZEDdURd2+BHygUp+DugjX4la0tiQs= X-Google-Smtp-Source: AG47ELs1AluYuC0D7EYZzLpvOFR2ijXGe+OnHgznViymdXQFZGOhGMfI78KJfiIQ9Ptgqu8rAwZbrZjJ3wrGjDjI1EI= X-Received: by 10.202.104.170 with SMTP id o42mr16775277oik.296.1521977788786; Sun, 25 Mar 2018 04:36:28 -0700 (PDT) MIME-Version: 1.0 Received: by 10.201.13.44 with HTTP; Sun, 25 Mar 2018 04:36:28 -0700 (PDT) In-Reply-To: References: From: Sowmini Varadhan Date: Sun, 25 Mar 2018 07:36:28 -0400 Message-ID: To: rs.ietf@gmx.at Cc: ycheng@google.com, tcpm@ietf.org, draft-ietf-tcpm-rack@tools.ietf.org, Sowmini Varadhan Content-Type: text/plain; charset="UTF-8" Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 25 Mar 2018 11:36:30 -0000 > However, I'm of split opinion on this relaxation of the strict in-order delivery requirment. > : e (more processing overhead in the receiver, to get the data in-order)? Or is that concern misplaced? > > One datapoint I would like to see would be a comparison of the receiving tcp stack cpu cost, comparing persistent, heavy reordering at around 1/2 RTT at the same sender bandwidth as a "proper" in-order delivered datastream... In addition to that concern, there is another aspect to excessive re-ordering: while RACK applies to TCP packets, there are other protocols like IPsec where excessive re-ordering will result in packet drops as a defense against replay-protection. Thus you would end up needing to relax your replay window to dea with excessive reordering, and that, in turn, may not be what you want for security. So there are constraints. --Sowmini From nobody Sun Mar 25 09:37:42 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C5E47126D0C for ; Sun, 25 Mar 2018 09:37:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.711 X-Spam-Level: X-Spam-Status: No, score=-2.711 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id M-XYVSrzqSR1 for ; Sun, 25 Mar 2018 09:37:40 -0700 (PDT) Received: from mail-it0-x235.google.com (mail-it0-x235.google.com [IPv6:2607:f8b0:4001:c0b::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6147C1200F1 for ; Sun, 25 Mar 2018 09:37:40 -0700 (PDT) Received: by mail-it0-x235.google.com with SMTP id h143-v6so231637ita.4 for ; Sun, 25 Mar 2018 09:37:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=VhkZG2FW1Avl8lreOmA38SdkijZUosx1koVpYwHluTA=; b=eX6TcRKsEo3Hfl8fhjzsm2L31/22GADAvh/5JhQH1aG6dcDwUccobqj2UlQm9ZVSCZ zUclYrXfNABfQxA94LKeZNYqLY9YyLQnIbzAJZLxC7XUS+HPPRaYunG8WSJCAWeUiJFn oilG1M9G1oG0rEijt54v3d10IGBzOOU5aQgW3gkq8pu/rHcFhNtnKWgrKdauZrniRU0p 7v3dcZmMzHHecgw70puhQKikKs2WEW/EbBaLyvj+cAQISIJ5lHLmTZx7kTM9g1rxZs2s 72nRpowc+k3qZb47X4gm9hQku+bEX7DXQwvicFGAeWS3Pbke2ERV+oSYEi1Ojv2RxcJ6 GiIg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=VhkZG2FW1Avl8lreOmA38SdkijZUosx1koVpYwHluTA=; b=haAJWCnae5pnS8Isc8/8Dohsz99BV/rvHxoECnUOCaslkHLEpUkzCeE0bJKRdB1LJ2 VQAvaz57oBygueAmHomly+R0T8sLqx5GGfMy5OHH/NB+6Gxyrs6KZ3I4m+9Fxa3NgMen BkGFm3o8dKijmnpRl76bVYz31Zaa1zqGoqtlhwiQFc5ynGxheyT0GiQ5Pdo1Z/vORzaR Xer06q+dVfNYLvrQmkkdDqN8U9Jc3ZwODYncXZTzuId1VTVVrKqxSIkgPNPwkodUF8XV 0H6bybX1VpR/Q5C1zH0nfeEir84lAxA80dK2z/uQ1Ebg05Lh5lmwUp2jOPSng3mTpvJC 8rrg== X-Gm-Message-State: AElRT7Ek5WzlsAXS2UQWLE/jRQ/4PX6K38drNWyMFAH7xyaBwBC6wCNT U+AUHLqEtDm87xM1YTz6zBjNjf3+QwqvYTadtMXEZg== X-Google-Smtp-Source: AG47ELsAXK3UHxDk/X8F5hxE/45sfuCnA7aVu9AzWGOwX91x6wubcjWWhPcAGVgoR8ZluTep3LH1Qe5yRondsiG1VWY= X-Received: by 2002:a24:2545:: with SMTP id g66-v6mr20575314itg.45.1521995859360; Sun, 25 Mar 2018 09:37:39 -0700 (PDT) MIME-Version: 1.0 Received: by 10.107.138.29 with HTTP; Sun, 25 Mar 2018 09:36:58 -0700 (PDT) In-Reply-To: References: From: Yuchung Cheng Date: Sun, 25 Mar 2018 17:36:58 +0100 Message-ID: To: Sowmini Varadhan Cc: Richard Scheffenegger , "tcpm@ietf.org Extensions" , draft-ietf-tcpm-rack@tools.ietf.org, Sowmini Varadhan Content-Type: text/plain; charset="UTF-8" Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 25 Mar 2018 16:37:42 -0000 I completely agree with Olivier and Sowmini that excessive reordering can be harmful to TCP and non-TCP. There are various concerns beyond loss detection such as DoS, GRO efficiencies and congestion control. I will discuss with the co-authors to add more text to RACK draft. 1. incorporate Bob's "bigger picture" of reordering statement 2. more detailed discussion of excessive reordering 3. be very explicit and clear that RACK initially starts with a small reordering window PLUS 3-dupack threshold (equivalent of standard fast recovery plus early-retransmit). 4. an experiment section of the goal and what to do. 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Adapting reordering window to reordering degree Thread-Index: AQHTwHhDefCerijpEUi/56FpakFaOqPcrGAAgAYE5/A= Date: Mon, 26 Mar 2018 15:45:32 +0000 Message-ID: References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <284E217A-4A12-4EC1-A9C6-52B6FFF67FFD@tessares.net> In-Reply-To: <284E217A-4A12-4EC1-A9C6-52B6FFF67FFD@tessares.net> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [2001:4898:80e8:4::712] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; CY4PR21MB0790; 7:u/Dn942RrwSyuLtp84R3RV2OK/nYjIw0DdCUKz03L/FGj/wHaRzcMZV+GsynXuZ847corKkrjCF5w7AOusjIVE2sXRJp0Dp7O8FBy99RMBtanJxDqSwl+Keb5stOizs06pf563sGzKhaB+edvARZT9quamIGYBEpvw2WCCUuo/+1elpEtkh4F2mo+dIG+JloDKP42ieU6juIrrdcYwaswrqFd93JiAi2s6STh2aE761AQ4hyyZXUBQ8XMbYT8okw; 20:CX5tbgBJUehHCU99bzaxBsuM7l2kFiBa2N2Ag7Zv73bn+ddrFSrFV7tHIIoWyZeF+paK/TLyoN8Lg4iFbDi11kOqFa+lN21NBpQBsLLRGR8UidegnldofYKRhUU/C+H1550uide3arMP1lbHTTbfsQAeDMH1kGxgXrDWM8nPyyU= x-ms-exchange-antispam-srfa-diagnostics: SOS; x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 33c4aadb-fb7e-42e9-d926-08d593309c26 x-microsoft-antispam: UriScan:; BCL:0; PCL:0; RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020); SRVR:CY4PR21MB0790; x-ms-traffictypediagnostic: CY4PR21MB0790: x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(21748063052155); x-exchange-antispam-report-cfa-test: BCL:0; PCL:0; RULEID:(8211001083)(61425038)(6040522)(2401047)(5005006)(8121501046)(3231221)(944501327)(52105095)(3002001)(93006095)(93001095)(10201501046)(6055026)(61426038)(61427038)(6041310)(20161123564045)(20161123558120)(20161123562045)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123560045)(6072148)(201708071742011); SRVR:CY4PR21MB0790; BCL:0; PCL:0; RULEID:; SRVR:CY4PR21MB0790; x-forefront-prvs: 06237E4555 x-forefront-antispam-report: SFV:NSPM; SFS:(10019020)(39380400002)(366004)(376002)(346002)(39860400002)(396003)(42154003)(40124003)(38564003)(34854003)(189003)(199004)(14454004)(3660700001)(8936002)(186003)(86612001)(4326008)(6246003)(86362001)(10090500001)(316002)(446003)(81166006)(2906002)(5250100002)(6346003)(3280700002)(33656002)(6506007)(7736002)(76176011)(2900100001)(476003)(105586002)(102836004)(478600001)(9686003)(59450400001)(6306002)(54896002)(53936002)(53546011)(68736007)(55016002)(106356001)(790700001)(6116002)(5660300001)(25786009)(8990500004)(110136005)(7696005)(54906003)(74316002)(229853002)(10290500003)(46003)(8676002)(97736004)(11346002)(6436002)(22452003)(99286004)(81156014)(486005)(486005); DIR:OUT; SFP:1102; SCL:1; SRVR:CY4PR21MB0790; H:CY4PR21MB0630.namprd21.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; MX:1; A:1; received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) authentication-results: spf=none (sender IP is ) smtp.mailfrom=pravb@microsoft.com; x-microsoft-antispam-message-info: kTaSfAYjTtxOI5C0xEJG7YOaJDwl6QZfQPDkt/XM97eyvrZRkEaW61cXJvM+urQVgkLn1qqg5q/QmDmS8yJ5907JYXX1NXtZ1EDdgA1PT5yGgvZdsHDwjlkTD4stEjDBFeMp81KxVkfxh5v7kF86dRajYa/0eg/tISFuBgCSRgstQSGeIvuokDTrc9izJU/q/kKSuMFsp0RvoAWKdhzfl0/P4hEIy3FSNvU90yV8//KcKfzC+2OwIviSDmTWHZsBY+WQ+ONpeMlUoWT7e6JIjXWN0ggOQg6Oh2vCkRG/br3hGhDQDC/5HHEX3Pt8uvSwdyJ2HYIjY33BY6rJpqzexQ== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/alternative; boundary="_000_CY4PR21MB0630B185DB997C389EEF1810B6AD0CY4PR21MB0630namp_" MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 33c4aadb-fb7e-42e9-d926-08d593309c26 X-MS-Exchange-CrossTenant-originalarrivaltime: 26 Mar 2018 15:45:32.9037 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0790 Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Mar 2018 15:45:38 -0000 --_000_CY4PR21MB0630B185DB997C389EEF1810B6AD0CY4PR21MB0630namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable There are a lot of assumptions in not just host TCPIP stacks but in network= ing stack in general that reordering is not the common case. We put in a lo= t of work to make the common in order case work blazingly fast all the way = from the hardware to the software stack. Yes the stack needs to tolerate so= me reordering but we are not ready for a world where networks build in reor= dering as a common case. Any such behavior will cause severe performance is= sues. How about if the draft specify a minimum reordering threshold in time (RTT/= 4) and number of packets (3) and leaves the further extension of increasing= the threshold as an optional improvement to handle bad network behavior? W= ithout doing tests I cannot determine the memory and CPU impact of allowing= it to grow to SRTT worth in time domain. Also I worry about what Bob is sa= ying that this could become a vicious cycle with increasing reordering -- a= nd even if we fix RACK the rest of hardware and software stack will not be = ready for it. Deliberate reordering is not an acceptable network behavior, = it should only happen during rare events like route flaps or ECMP flaps. Thanks From: tcpm [mailto:tcpm-bounces@ietf.org] On Behalf Of Olivier Bonaventure Sent: Thursday, March 22, 2018 12:48 PM To: Bob Briscoe Cc: tcpm@ietf.org; draft-ietf-tcpm-rack@tools.ietf.org Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window = to reordering degree Bob, What I was trying to say at the tcpm mic just now. This could be considered as a first draft of the text you asked me to write= ... The Bigger Picture The reordering degree of a link is not a constant. It evolves (over years) = dependent on TCP. * From a link designers viewpoint, parallelizing (eg. link bonding) is = the easiest way to get their link to go faster * So their main constraint on speed is reordering and there is huge = pressure on them to relax that constraint * The /only/ thing that is holding them back from introducing more r= eordering is the 3 dupacks in TCP or the RTT/4 rule in RACK-02 * It is likely RACK will become widespread * Given RACK-03 now adapts to the reordering window, link designers wil= l introduce more reordering * That is GOOD (virtuous circle), but only up to a point (vicious circl= e). * We need to write down what that point is * We need to ensure the algorithm stops adapting at that point. I agree that parallelising is a nice way to expand the capacity of links, t= ypically in the access. However, link designers should not assume that they= can parallelise whatever they want and let TCP figure out what is happenin= g and solve any issue. If TCP packets are sent over two parallel links that have similar character= istic, then it should work fine.. However, as soon as one of these links ha= s different characteristics (in terms of delay, bandwidth, congestion, pack= et losses), TCP will have difficulties to understand what is happening in t= he network if it cannot know which packet is sent over which link. A better= approach when bonding access links is to expose them to a multipath capabl= e transport layer and let it figure out the characteristics of the differen= t links and use them efficiently.. With IPv6, access link designers have th= e ability to expose multiple addresses to the endhosts and we should encour= age this behaviour when those addresses correspond to links with different = characteristics Olivier ________________________________ DISCLAIMER. This email and any files transmitted with it are confidential and intended = solely for the use of the individual or entity to whom they are addressed. = If you have received this email in error please notify the system manager. = This message contains confidential information and is intended only for the= individual named. If you are not the named addressee you should not dissem= inate, distribute or copy this e-mail. Please notify the sender immediately= by e-mail if you have received this e-mail by mistake and delete this e-ma= il from your system. If you are not the intended recipient you are notified= that disclosing, copying, distributing or taking any action in reliance on= the contents of this information is strictly prohibited. --_000_CY4PR21MB0630B185DB997C389EEF1810B6AD0CY4PR21MB0630namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

There are a lot of assumptions in not just host T= CPIP stacks but in networking stack in general that reordering is not the c= ommon case. We put in a lot of work to make the common in order case work b= lazingly fast all the way from the hardware to the software stack. Yes the stack needs to tolerate some reord= ering but we are not ready for a world where networks build in reordering a= s a common case. Any such behavior will cause severe performance issues.

 

How about if the draft specify a minimum reorderi= ng threshold in time (RTT/4) and number of packets (3) and leaves the furth= er extension of increasing the threshold as an optional improvement to hand= le bad network behavior? Without doing tests I cannot determine the memory and CPU impact of allowing it to grow = to SRTT worth in time domain. Also I worry about what Bob is saying that th= is could become a vicious cycle with increasing reordering -- and even if w= e fix RACK the rest of hardware and software stack will not be ready for it. Deliberate reordering is not = an acceptable network behavior, it should only happen during rare events li= ke route flaps or ECMP flaps.

 

Thanks

 

From: tcpm [mailto:tcpm-bounces@ietf.org] = On Behalf Of Olivier Bonaventure
Sent: Thursday, March 22, 2018 12:48 PM
To: Bob Briscoe <ietf@bobbriscoe.net>
Cc: tcpm@ietf.org; draft-ietf-tcpm-rack@tools.ietf.org
Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering = window to reordering degree

 

Bob,

 

What I was trying to say at the tcpm mic just now. This could be considered as a first draft of the text you asked me to write= ...

The Bigger Picture

The reordering degree of a link is not a constant. I= t evolves (over years) dependent on TCP.

  • >From a link designers viewpoint, parallelizing (eg. link bonding) is the ea= siest way to get their link to go faster
    • So their main constraint on speed is reordering and there is huge pressure = on them to relax that constraint
    • The /only/ thing that is holding them back from introducing more reordering= is the 3 dupacks in TCP or the RTT/4 rule in RACK-02
  • It is likely RACK will become widespread
  • Given RACK-03 now adapts to the reordering window, link designers will intr= oduce more reordering
  • That is GOOD (virtuous circle), but only up to a point (vicious circle).
    • We need to write down what that point is
    • We need to ensure the algorithm stops adapting at that point.

 

I agree that parallelising is a nice way to expand t= he capacity of links, typically in the access. However, link designers shou= ld not assume that they can parallelise whatever they want and let TCP figu= re out what is happening and solve any issue.

 

If TCP packets are sent over two parallel links that= have similar characteristic, then it should work fine.. However, as soon a= s one of these links has different characteristics (in terms of delay, band= width, congestion, packet losses), TCP will have difficulties to understand what is happening in the network = if it cannot know which packet is sent over which link. A better approach w= hen bonding access links is to expose them to a multipath capable transport= layer and let it figure out the characteristics of the different links and use them efficiently.. With IPv= 6, access link designers have the ability to expose multiple addresses to t= he endhosts and we should encourage this behaviour when those addresses cor= respond to links with different characteristics

 

 

Olivier

 

 

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--_000_CY4PR21MB0630B185DB997C389EEF1810B6AD0CY4PR21MB0630namp_-- From nobody Mon Mar 26 09:16:15 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CDBF2124B17 for ; Mon, 26 Mar 2018 09:16:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.711 X-Spam-Level: X-Spam-Status: No, score=-2.711 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7bd1E9VVIX-q for ; Mon, 26 Mar 2018 09:16:10 -0700 (PDT) Received: from mail-it0-x22d.google.com (mail-it0-x22d.google.com [IPv6:2607:f8b0:4001:c0b::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2236E120724 for ; Mon, 26 Mar 2018 09:16:10 -0700 (PDT) Received: by mail-it0-x22d.google.com with SMTP id m134-v6so6723381itb.3 for ; Mon, 26 Mar 2018 09:16:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=mQAvzhKqu40WZv5Yf2oFSvmLS271+9F68lC77PzSGxE=; b=IYZruU+uDghreyEaTbT44NwvcFFkqBQolIMeH2XAp29zMGRaJ3oX1nKDhfVrXb9Ykb CeYv77S1QwH+gbSffjhHIab9aR9xwskMX4sGI/HGAySXwWHA8KUqFBIKMZ68EkrVbjzb 4STxeKSFbjZiqWopyuD29RFHHLPrYaz/S8BEfGc/QjhPZeKl0sdJVwcGrv7vsvIN5mUB 9D3EV0L3NPSUop9yWzKYCaqFhUTUBe49e+ospzePqs6t90tA4BQL4S2uBWj0z7Qd62c7 6LDiQtoOrHeUwnnoLOPRhWYATtkx0paQBJIpbpE1zUmwwdJNGwJyNqkAbiWkGRhEojB5 hqEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=mQAvzhKqu40WZv5Yf2oFSvmLS271+9F68lC77PzSGxE=; b=AOCakM4fm0mHwWiHdZJl7K6gFiZl0erE+kAcBMT0Dz8Q69+zc/ullMW3+FW5ThkhqT sUUe0pX7dEZ6CZbyIUv55a+Zr9PAmVg0DDnOtnOXJDBpwkvU1F5bL6Jk3meeW7x38Oeg lIMnDROHdxHX5VDxu23iC1ikXNGSJZ7Gkoqcq5s91uo2QsK0SBQGZRcmjKTxfhJO4Tju KtyF3t314Mt7MCC427qxnj2N1HrH7TrOl2QyXMvor89VRlsaD+4pkSThC8vI5O665tuZ 9lesXbqg5YpQ2sx05RB4Ks2zv9hvpQC6sk+Xo22HVY7i4wFu6Tmx+fLSp6qfvlBq3t8Q 687Q== X-Gm-Message-State: AElRT7Fmt+iD2luDAqw7eA0wZTg7Mpz99EqSwczwlhfFN59YGDsZ40/V FKP4NLJ1nw+hqVC/EPmojmUk78hGuljNTmKjrKT3lA== X-Google-Smtp-Source: AIpwx4/+mmIEuc0myZXe18+Pqk0+YFFYtuoPnA3l8vanNUPSFXEwdV3D/R1YTdhkcCvvrCI1Zi0xSjZYziLMzOFggII= X-Received: by 2002:a24:9985:: with SMTP id a127-v6mr5015878ite.108.1522080968909; Mon, 26 Mar 2018 09:16:08 -0700 (PDT) MIME-Version: 1.0 Received: by 10.107.138.29 with HTTP; Mon, 26 Mar 2018 09:15:28 -0700 (PDT) In-Reply-To: References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <284E217A-4A12-4EC1-A9C6-52B6FFF67FFD@tessares.net> From: Yuchung Cheng Date: Mon, 26 Mar 2018 09:15:28 -0700 Message-ID: To: Praveen Balasubramanian Cc: Olivier Bonaventure , Bob Briscoe , "tcpm@ietf.org" , "draft-ietf-tcpm-rack@tools.ietf.org" Content-Type: text/plain; charset="UTF-8" Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Mar 2018 16:16:13 -0000 On Mon, Mar 26, 2018 at 8:45 AM, Praveen Balasubramanian wrote: > There are a lot of assumptions in not just host TCPIP stacks but in > networking stack in general that reordering is not the common case. We put > in a lot of work to make the common in order case work blazingly fast all > the way from the hardware to the software stack. Yes the stack needs to > tolerate some reordering but we are not ready for a world where networks > build in reordering as a common case. Any such behavior will cause severe > performance issues. > > > > How about if the draft specify a minimum reordering threshold in time > (RTT/4) and number of packets (3) and leaves the further extension of > increasing the threshold as an optional improvement to handle bad network > behavior? Without doing tests I cannot determine the memory and CPU impact Praveen: thanks for the feedback. The current draft is already similar to what you described a) initially reo_wnd=min_RTT/4 and/or dupthresh=3 b) optionally extend reo_wnd up to SRTT based on DSACK. section 5.2 [snip] Extension 1: Optionally size the window based on DSACK Further, the sender MAY leverage DSACK [RFC3708] to adapt the reordering window to higher degrees of reordering. ... Extension 3: Optionally size the window with the classic DUPACK threshold heuristic The DUPACK threshold approach in the current standards [RFC5681][RFC6675] is simple, and for decades has been effective in quickly detecting losses, .... RACK_update_reo_wnd: RACK.min_RTT = TCP_min_RTT() If RACK_ext_TCP_ACK_has_DSACK_option(): RACK.dsack = true If SND.UNA < RACK.roundtrip_seq: RACK.dsack = false /* React to DSACK once within a round trip */ If RACK.dsack: RACK.reo_wnd_incr += 1 RACK.dsack = false RACK.roundtrip_seq = SND.NXT RACK.reo_wnd_persist = 16 /* Keep window for 16 loss recoveries */ Else if exiting loss recovery: RACK.reo_wnd_persist -= 1 If RACK.reo_wnd_persist <= 0: RACK.reo_wnd_incr = 1 If in loss recovery and not RACK_ext_TCP_seen_reordering(): RACK.reo_wnd = 0 Else if RACK_ext_TCP_dupack_threshold_hit(): /* DUPTHRESH emulation mode */ RACK.reo_wnd = 0 Else: RACK.reo_wnd = RACK.min_RTT / 4 * RACK.reo_wnd_incr RACK.reo_wnd = min(RACK.reo_wnd, SRTT) There are two action items 1) clarify the reo_wnd policy further 2) incorporate the reordering detection algorithm based on SACK > of allowing it to grow to SRTT worth in time domain. Also I worry about what > Bob is saying that this could become a vicious cycle with increasing > reordering -- and even if we fix RACK the rest of hardware and software > stack will not be ready for it. Deliberate reordering is not an acceptable > network behavior, it should only happen during rare events like route flaps > or ECMP flaps. > > > > Thanks > > > > From: tcpm [mailto:tcpm-bounces@ietf.org] On Behalf Of Olivier Bonaventure > Sent: Thursday, March 22, 2018 12:48 PM > To: Bob Briscoe > Cc: tcpm@ietf.org; draft-ietf-tcpm-rack@tools.ietf.org > Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window > to reordering degree > > > > Bob, > > > > What I was trying to say at the tcpm mic just now. > This could be considered as a first draft of the text you asked me to > write... > > The Bigger Picture > > The reordering degree of a link is not a constant. It evolves (over years) > dependent on TCP. > > From a link designers viewpoint, parallelizing (eg. link bonding) is the > easiest way to get their link to go faster > > So their main constraint on speed is reordering and there is huge pressure > on them to relax that constraint > The /only/ thing that is holding them back from introducing more reordering > is the 3 dupacks in TCP or the RTT/4 rule in RACK-02 > > It is likely RACK will become widespread > Given RACK-03 now adapts to the reordering window, link designers will > introduce more reordering > That is GOOD (virtuous circle), but only up to a point (vicious circle). > > We need to write down what that point is > We need to ensure the algorithm stops adapting at that point. > > > > I agree that parallelising is a nice way to expand the capacity of links, > typically in the access. However, link designers should not assume that they > can parallelise whatever they want and let TCP figure out what is happening > and solve any issue. > > > > If TCP packets are sent over two parallel links that have similar > characteristic, then it should work fine.. However, as soon as one of these > links has different characteristics (in terms of delay, bandwidth, > congestion, packet losses), TCP will have difficulties to understand what is > happening in the network if it cannot know which packet is sent over which > link. A better approach when bonding access links is to expose them to a > multipath capable transport layer and let it figure out the characteristics > of the different links and use them efficiently.. With IPv6, access link > designers have the ability to expose multiple addresses to the endhosts and > we should encourage this behaviour when those addresses correspond to links > with different characteristics > > > > > > Olivier > > > > > > ________________________________ > > DISCLAIMER. > This email and any files transmitted with it are confidential and intended > solely for the use of the individual or entity to whom they are addressed. > If you have received this email in error please notify the system manager. > This message contains confidential information and is intended only for the > individual named. If you are not the named addressee you should not > disseminate, distribute or copy this e-mail. Please notify the sender > immediately by e-mail if you have received this e-mail by mistake and delete > this e-mail from your system. If you are not the intended recipient you are > notified that disclosing, copying, distributing or taking any action in > reliance on the contents of this information is strictly prohibited. From nobody Mon Mar 26 22:40:56 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EE45612711A for ; Mon, 26 Mar 2018 22:40:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.99 X-Spam-Level: X-Spam-Status: No, score=-1.99 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_SPF_PERMERROR=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RgdHBP3U5wlN for ; Mon, 26 Mar 2018 22:40:53 -0700 (PDT) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B52D41270AC for ; Mon, 26 Mar 2018 22:40:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=To:References:Message-Id: Content-Transfer-Encoding:Cc:Date:In-Reply-To:From:Subject:Mime-Version: Content-Type:Sender:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=poByADcOvJ5tr6Vc39id5n28ElOtWQ8z6dMmo+PHWdo=; b=16bVpv0Gws57Ex0Mcx/CeXg22 C9SU1r5VciMPA2Sfbs1ipbSgrmwTK31pwcp/j2MlWgU6kvZScZigg8mOoi4VXH1z+432dV5WpU3Px EcefIOvi47eMukhsuF11UvdhQXJIdup32GEudWWu/YfK7lAHV7QHBJZkROitdpc3g3NpGbi2nBp73 cx9vXLzkb9VugNSJZw1hCnILo1NYzKKqzc4GNO6GcdBWaaFS1nmBoao1CwBnJLboIWKiy8q0aqIu0 L/MZGKa5Ymb8xMRZWS89VU3Y3cNXOpNVf6j/E/Uyp8Hk63HV4BvaZTw87qn8ZTdmWHxS7q4jLHP+h MIue0zyFg==; Received: from cpe-172-250-240-132.socal.res.rr.com ([172.250.240.132]:54869 helo=[192.168.1.179]) by server217.web-hosting.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1f0hLS-001m8W-LP; Tue, 27 Mar 2018 01:40:31 -0400 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (1.0) From: Joe Touch X-Mailer: iPhone Mail (15D100) In-Reply-To: Date: Mon, 26 Mar 2018 22:40:25 -0700 Cc: Olivier Bonaventure , Bob Briscoe , Yuchung Cheng , "tcpm@ietf.org" , "draft-ietf-tcpm-rack@tools.ietf.org" Content-Transfer-Encoding: quoted-printable Message-Id: <5784486C-1DEF-43E1-B2C7-E61DF4C19178@strayalpha.com> References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <284E217A-4A12-4EC1-A9C6-52B6FFF67FFD@tessares.net> To: Praveen Balasubramanian X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Mar 2018 05:40:55 -0000 > On Mar 26, 2018, at 8:45 AM, Praveen Balasubramanian = wrote: >=20 > Deliberate reordering is not an acceptable network behavior, Reordering, dropping, and repeating packets are all valid IP network phenome= na.=20 There is no need to infer intent to decide otherwise.=20 Joe= From nobody Tue Mar 27 08:24:58 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3CA2712DA41 for ; Tue, 27 Mar 2018 08:24:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=microsoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6WqW8y2B54Ap for ; Tue, 27 Mar 2018 08:24:55 -0700 (PDT) Received: from NAM03-CO1-obe.outbound.protection.outlook.com (mail-co1nam03on0132.outbound.protection.outlook.com [104.47.40.132]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5579A1275FD for ; Tue, 27 Mar 2018 08:24:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=mNKTeM8hKNtbuVZHsL5FmnIAhxv10e3G5HiO1oN56bw=; b=DPYiTSNH6UcODpInEV7ijnRJOmXhEOiRvWNz4mTR5ey7INWNlJaAo7QC9wC0CsEXleLK4pcZOJm0pOthkW7nMZysgMtcZcyEUDGyisAssNsOjula6JJ7iVzcZ+W9YrDUBAh1918Ll/mh2TpFJHtTNZu6QkkKuHfyqqLaUm9463I= Received: from CY4PR21MB0630.namprd21.prod.outlook.com (10.175.115.20) by CY4PR21MB0856.namprd21.prod.outlook.com (10.173.192.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.653.1; Tue, 27 Mar 2018 15:24:52 +0000 Received: from CY4PR21MB0630.namprd21.prod.outlook.com ([fe80::de:ba33:4748:51da]) by CY4PR21MB0630.namprd21.prod.outlook.com ([fe80::de:ba33:4748:51da%6]) with mapi id 15.20.0653.002; Tue, 27 Mar 2018 15:24:52 +0000 From: Praveen Balasubramanian To: Joe Touch CC: Olivier Bonaventure , Bob Briscoe , Yuchung Cheng , "tcpm@ietf.org" , "draft-ietf-tcpm-rack@tools.ietf.org" Thread-Topic: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree Thread-Index: AQHTwHhDefCerijpEUi/56FpakFaOqPcrGAAgAYE5/CAAOn+gIAAof5Q Date: Tue, 27 Mar 2018 15:24:52 +0000 Message-ID: References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <284E217A-4A12-4EC1-A9C6-52B6FFF67FFD@tessares.net> <5784486C-1DEF-43E1-B2C7-E61DF4C19178@strayalpha.com> In-Reply-To: <5784486C-1DEF-43E1-B2C7-E61DF4C19178@strayalpha.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [2001:4898:80e8:7::712] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; CY4PR21MB0856; 7:pVuNQgt9+u7V5ufz+V1k6EX6MbNqUUh7XBlYhefzWfuLT2t+NKqmfhBI2p89niAafyBL0lSefg0fKfwDsYR82Gn04+UnBfV7zoDYZFJIFoMLaAKLQvMEX0FngHJpYsI4sEzavQZerzJFsshR4eP6odzfw98MvS6Hpc//o9VkCtEm1zOVGN6E853Deo0Lq5uwMSXyDLU34uep35eG+RuTkzZRxMgfFsCKCxbvScNCg4XaKR6yJHy2KvxUdqCSI9I6; 20:fRg/0o6nKH8DKPTrQN5o73WwzcCs8P2B2XgWOIaoZhJpZkkD871vDuclQiVMltpkRVBBJR0OY4g7g99RT+4E2gyP+027tm+HqU1aSba7lb2R7zcQ2nFcna1zVPnsuu5LyqrHBAZ7eROqz37ZBidVU9gErtEJvT773e8Hb5+FREo= x-ms-exchange-antispam-srfa-diagnostics: SOS; x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: fff352ae-ce19-45a5-7e1e-08d593f6e349 x-microsoft-antispam: UriScan:; BCL:0; PCL:0; RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7153060)(7193020); SRVR:CY4PR21MB0856; x-ms-traffictypediagnostic: CY4PR21MB0856: x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171)(211936372134217)(153496737603132); x-exchange-antispam-report-cfa-test: BCL:0; PCL:0; RULEID:(8211001083)(61425038)(6040522)(2401047)(5005006)(8121501046)(10201501046)(93006095)(93001095)(3002001)(3231221)(944501327)(52105095)(6055026)(61426038)(61427038)(6041310)(20161123564045)(20161123558120)(20161123562045)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123560045)(6072148)(201708071742011); SRVR:CY4PR21MB0856; BCL:0; PCL:0; RULEID:; SRVR:CY4PR21MB0856; x-forefront-prvs: 0624A2429E x-forefront-antispam-report: SFV:NSPM; SFS:(10019020)(39860400002)(396003)(39380400002)(366004)(346002)(376002)(13464003)(199004)(189003)(446003)(76176011)(46003)(25786009)(3280700002)(5250100002)(6346003)(102836004)(53546011)(8676002)(81156014)(54906003)(6506007)(81166006)(4326008)(97736004)(10090500001)(8990500004)(14454004)(86362001)(5660300001)(6116002)(11346002)(3660700001)(86612001)(478600001)(6246003)(93886005)(6916009)(99286004)(486005)(6436002)(9686003)(7736002)(316002)(186003)(10290500003)(7696005)(305945005)(229853002)(55016002)(8936002)(105586002)(106356001)(74316002)(33656002)(22452003)(68736007)(486005)(476003)(2906002)(2900100001)(53936002); DIR:OUT; SFP:1102; SCL:1; SRVR:CY4PR21MB0856; H:CY4PR21MB0630.namprd21.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) authentication-results: spf=none (sender IP is ) smtp.mailfrom=pravb@microsoft.com; x-microsoft-antispam-message-info: FTB8xlV6qzk4hCEhrMCTWx0vloZzFnjNO+u5vW8yr9MCUXPpo/nwtIZn50aA6tTnwyPDbVW2kzjPi/tkIMn7u8HOkl25LF0XGoX/owYaLxDc5T+tQ6hcsH0PFqCNVLCtGwQ2SwMCtXskoqIp1+9jik9g0Eb46KVOAWjNMvt1DnABqNoVWx24DPu4G/cKk6NXlZKbFcPjxekXCFp8dU46ZMFO110UOJjWV8eRHJUgjpbirjZ9TQYd00RAM9sEmbJdi/LqMfNDMBZPHq+jwV5HRkHt4A6BIiwkX9POF5bN2/N9Uao3AzuYJ9lc/2ETx3/N1AhE5ItIoxmDa/HMagWGZg== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: fff352ae-ce19-45a5-7e1e-08d593f6e349 X-MS-Exchange-CrossTenant-originalarrivaltime: 27 Mar 2018 15:24:52.6024 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0856 Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Mar 2018 15:24:57 -0000 Agreed they are all valid events and I alluded to some examples in email bu= t they are very rare events and most connections are unaffected. A lot of s= ystems development is about trade-offs and optimizing for the common case i= s one of the most commonly applied trade-offs. No need to infer intent, but= just making TCP loss recovery more resilient to reordering will not addres= s the performance issues across the entire ecosystem if reordering became m= ore prevalent. -----Original Message----- From: Joe Touch [mailto:touch@strayalpha.com]=20 Sent: Monday, March 26, 2018 10:40 PM To: Praveen Balasubramanian Cc: Olivier Bonaventure ; Bob Briscoe ; Yuchung Cheng ; tcpm@ietf.org; draft= -ietf-tcpm-rack@tools.ietf.org Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window = to reordering degree > On Mar 26, 2018, at 8:45 AM, Praveen Balasubramanian wrote: >=20 > Deliberate reordering is not an acceptable network behavior, Reordering, dropping, and repeating packets are all valid IP network phenom= ena.=20 There is no need to infer intent to decide otherwise.=20 Joe From nobody Tue Mar 27 09:30:15 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9DBF0127863 for ; Tue, 27 Mar 2018 09:30:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.99 X-Spam-Level: X-Spam-Status: No, score=-1.99 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_SPF_PERMERROR=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iiQDNqJT9dxa for ; Tue, 27 Mar 2018 09:30:13 -0700 (PDT) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6EC451243F3 for ; Tue, 27 Mar 2018 09:30:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=To:References:Message-Id: Content-Transfer-Encoding:Cc:Date:In-Reply-To:From:Subject:Mime-Version: Content-Type:Sender:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=uroNx0nLxdVaTv/p6PFC3wt9bi2xU/xMiNvFx/vJCDE=; b=le1lTLg7DoH2d6F3fkCR/kS3Y qWYlo+HMM4jYEg+zOdDpoHmkBaziEEzYEa+naRk/EzFmfq9EPt7WrTB0ZYMQJRT1LLCjdH0YHLPu9 KXBavGLe/bKB3KUoVoy7pjG4QwmMoyRVkN97KmbfKhyoIGch+/QD+YB33D9qbF/+m/0r46CC3TqTI vGlOSv08UcYvXL7zY2RDMgZFXwlKU2RiBDc1rPUo38Dac/r5i7hBfee7QzvcBTJ8hOCRDOtnY8FqH YwhLGlpQz969OEtvWIhfYPXSAwJEGgOldrXBvO7N2xs5wkuLmrrqZIz3r/F5x7s+m2RD1N/nfKLG/ /c9v28M0w==; Received: from [204.140.240.55] (port=55437 helo=[172.26.22.136]) by server217.web-hosting.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1f0rTu-002A9I-Ag; Tue, 27 Mar 2018 12:29:55 -0400 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (1.0) From: Joe Touch X-Mailer: iPhone Mail (15D100) In-Reply-To: Date: Tue, 27 Mar 2018 09:29:47 -0700 Cc: Olivier Bonaventure , Bob Briscoe , Yuchung Cheng , "tcpm@ietf.org" , "draft-ietf-tcpm-rack@tools.ietf.org" Content-Transfer-Encoding: quoted-printable Message-Id: References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <284E217A-4A12-4EC1-A9C6-52B6FFF67FFD@tessares.net> <5784486C-1DEF-43E1-B2C7-E61DF4C19178@strayalpha.com> To: Praveen Balasubramanian X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Mar 2018 16:30:15 -0000 > On Mar 27, 2018, at 8:24 AM, Praveen Balasubramanian = wrote: >=20 > just making TCP loss recovery more resilient to reordering will not addres= s the performance issues across the entire ecosystem if reordering became mo= re prevalent Agreed but we should not be making TCP more brittle or performance-punished a= s a trade for =E2=80=9Cblue sky=E2=80=9D performance.=20 Joe= From nobody Tue Mar 27 09:46:31 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1B37F126C89 for ; Tue, 27 Mar 2018 09:46:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=microsoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dgrv11vTodaT for ; Tue, 27 Mar 2018 09:46:26 -0700 (PDT) Received: from NAM02-SN1-obe.outbound.protection.outlook.com (mail-sn1nam02on0138.outbound.protection.outlook.com [104.47.36.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A60FC126DED for ; Tue, 27 Mar 2018 09:46:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=IKsuHzC3nuH+rVY7YnN+rlETW64m29MHYmYq2jtKCxA=; b=eRqvt9/V4H6Bvd4kuHXK2bUkl23WAmZ4ZfrcHkml8X/N9nnlF/6fxLBsxwm4uoEQAc25dDwmL4m/PJvtNfuGTLBO1tg7KAcSD21ksUZyG9To50dvG/qmQnQhFTAEFJCUbQ5jtGm589L0oj7whKZ+pEDIzN46S5ahUNFk+zO905I= Received: from CY4PR21MB0630.namprd21.prod.outlook.com (10.175.115.20) by CY4PR21MB0134.namprd21.prod.outlook.com (10.173.189.16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.653.1; Tue, 27 Mar 2018 16:46:21 +0000 Received: from CY4PR21MB0630.namprd21.prod.outlook.com ([fe80::de:ba33:4748:51da]) by CY4PR21MB0630.namprd21.prod.outlook.com ([fe80::de:ba33:4748:51da%6]) with mapi id 15.20.0653.002; Tue, 27 Mar 2018 16:46:21 +0000 From: Praveen Balasubramanian To: Joe Touch CC: Olivier Bonaventure , Bob Briscoe , Yuchung Cheng , "tcpm@ietf.org" , "draft-ietf-tcpm-rack@tools.ietf.org" Thread-Topic: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree Thread-Index: AQHTwHhDefCerijpEUi/56FpakFaOqPcrGAAgAYE5/CAAOn+gIAAof5QgAATcICAAAN5QA== Date: Tue, 27 Mar 2018 16:46:21 +0000 Message-ID: References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <284E217A-4A12-4EC1-A9C6-52B6FFF67FFD@tessares.net> <5784486C-1DEF-43E1-B2C7-E61DF4C19178@strayalpha.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [2001:4898:80e8:7::712] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; CY4PR21MB0134; 7:h12vstQdkfGx3byJazila3F+BSEXcDmVckTeUP0pbKe+ZE+rEXy3AqqSuTvuFN6G7C7NtBeuKFKLoOOkXkFxMyFVnIwyKEBWYXTkzgk4LIRjMcoMIgn3HTGWoBLOM8KjiZ7p+VegpHBVQxfj7q5tjEGODKh7Og5X/SOb4iU8UqckhhBbD7VoK76FjyPHJdxM+mJVCfbGXPK3ly/z2rVFXTvH/APBTLH8zJ6sYiQZFz9uaXlOaCgX178/SBhuYRrk; 20:7sGZPaO75N3MyHOzMPUuzFoq667vnLips0vcuC1pCN7MHvx2h3HWLnlctWIYtzn+ZKZ7q8GqiF3T01cwGRDJXx/syJTuDNgewEZ3PNShVHY34RjGg/LQVfV7MLIkn0EPenWM5Km+rkZvMWPbBMagMib26iIWwPt6kDH1No0KFTY= x-ms-exchange-antispam-srfa-diagnostics: SOS; x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: f11905bb-ffc9-4512-10f0-08d59402453b x-microsoft-antispam: UriScan:; BCL:0; PCL:0; RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7153060)(7193020); SRVR:CY4PR21MB0134; x-ms-traffictypediagnostic: CY4PR21MB0134: x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171)(211936372134217)(153496737603132); x-exchange-antispam-report-cfa-test: BCL:0; PCL:0; RULEID:(8211001083)(61425038)(6040522)(2401047)(5005006)(8121501046)(3231221)(944501327)(52105095)(3002001)(93006095)(93001095)(10201501046)(6055026)(61426038)(61427038)(6041310)(20161123564045)(20161123558120)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123562045)(20161123560045)(6072148)(201708071742011); SRVR:CY4PR21MB0134; BCL:0; PCL:0; RULEID:; SRVR:CY4PR21MB0134; x-forefront-prvs: 0624A2429E x-forefront-antispam-report: SFV:NSPM; SFS:(10019020)(366004)(39380400002)(376002)(39860400002)(346002)(396003)(13464003)(199004)(189003)(5660300001)(478600001)(22452003)(8676002)(81166006)(6116002)(53546011)(6916009)(6506007)(11346002)(68736007)(486005)(486005)(81156014)(8936002)(97736004)(54906003)(6346003)(105586002)(5250100002)(93886005)(74316002)(186003)(33656002)(305945005)(7736002)(10090500001)(102836004)(10290500003)(476003)(3280700002)(53936002)(99286004)(6246003)(6436002)(46003)(76176011)(106356001)(55016002)(7696005)(3660700001)(9686003)(86612001)(8990500004)(446003)(25786009)(316002)(2906002)(14454004)(2900100001)(4326008)(59450400001)(229853002)(86362001); DIR:OUT; SFP:1102; SCL:1; SRVR:CY4PR21MB0134; H:CY4PR21MB0630.namprd21.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) authentication-results: spf=none (sender IP is ) smtp.mailfrom=pravb@microsoft.com; x-microsoft-antispam-message-info: /li24Gw28uHKB99UDqShO6PraVoPZX/t98lo86j4nXzPZlRf/rz5HTTHsfQM5Zl1W2d5j7cTFAswCvPu06BYqyyamiqDk5XCREhF/GDwf+9l/AqlVstw2MXzrHXJICXQG6XYVbhRTvAT4QLHtMQ987PSqx+cgIIDd7y/10ONZ8P+dAqYqV1Jhv2zRkiROaP/U/S33ng+Y9E4SH7UrwIELx52EpL2u/opUc1teO/Qtfe7zkO53BHXFoe8DUkHQXdXrvre9pJUM3b2eGnVUL2w81AtL0mfDqGCen1xfjN/zXtRGQo0hcPtYoMXAqZLlBq8tas+LQhY7Ny4bWg5utehyQ== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: f11905bb-ffc9-4512-10f0-08d59402453b X-MS-Exchange-CrossTenant-originalarrivaltime: 27 Mar 2018 16:46:21.3596 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0134 Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Mar 2018 16:46:29 -0000 SXQgaGFzIGJlZW4gdGhpcyB3YXkgZm9yIHllYXJzLiBUaGUgZHVwIHRocmVzaCB3YXMgZGVmaW5l ZCBhcyAzIHBhY2tldHMgYSBsb25nIHRpbWUgYWdvLiBUaGVyZSBpcyBubyBnb29kIGFuc3dlciBm b3Igd2hhdCB0aGUgbWF4IHRocmVzaG9sZCBzaG91bGQgYmUgaW4gdGVybXMgb2YgcGFja2V0cyBv ciB0aW1lLiBSQUNLIGRyYWZ0IGlzIHByb3Bvc2luZyBSVFQgd29ydGggYnV0IHdlIHdpbGwgbmVl ZCBhIGxvdCBtb3JlIGRhdGEuIFRoZXJlIGlzIHRyYWRlIG9mZiBiZXR3ZWVuIENQVSBhbmQgbWVt b3J5IHVzYWdlIGhlcmUgYW5kIG1hbnkgaW1wbGVtZW50YXRpb25zIGNhbiBjaG9vc2UgdG8gc3Rp Y2sgdG8gMyBwYWNrZXRzIG9yIFJUVC80LiBUaGUgcHJvYmxlbSB3aXRoIHRpbWUgZG9tYWluIGlz IHRoYXQgcmVvcmRlcmluZyBpcyBkZWZpbmVkIGFzIGEgZnVuY3Rpb24gb2YgUlRUIHdoaWNoIGlz IHZhcmlhYmxlIHNvIHlvdSBjYW5ub3QgZGVzaWduIGZvciBhbnkgY29ycmVjdCBsaW1pdC4gSWYg dGhlIFJUVCBpcyBzZWNvbmRzLCBvbiBhIGhpZ2ggQkRQIGxpbmsgdGhpcyBtYXkgbWVhbiB0aG91 c2FuZHMgb2YgcGFja2V0cy4gSSB0aGluayB3ZSBzdGlsbCBuZWVkIHRvIGRlZmluZSBhIHRocmVz aG9sZCBmb3IgbWF4IHBhY2tldHMgd2hpY2ggaXMgYWJzb2x1dGUuIE5vdGhpbmcgaW4gUkFDSyBw cmVjbHVkZXMgaGF2aW5nIGEgbWF4IHJlb3JkZXJpbmcgdGhyZXNob2xkIGluIG51bWJlciBvZiBw YWNrZXRzLg0KDQotLS0tLU9yaWdpbmFsIE1lc3NhZ2UtLS0tLQ0KRnJvbTogSm9lIFRvdWNoIFtt YWlsdG86dG91Y2hAc3RyYXlhbHBoYS5jb21dIA0KU2VudDogVHVlc2RheSwgTWFyY2ggMjcsIDIw MTggOTozMCBBTQ0KVG86IFByYXZlZW4gQmFsYXN1YnJhbWFuaWFuIDxwcmF2YkBtaWNyb3NvZnQu Y29tPg0KQ2M6IE9saXZpZXIgQm9uYXZlbnR1cmUgPG9saXZpZXIuYm9uYXZlbnR1cmVAdGVzc2Fy ZXMubmV0PjsgQm9iIEJyaXNjb2UgPGlldGZAYm9iYnJpc2NvZS5uZXQ+OyBZdWNodW5nIENoZW5n IDx5Y2hlbmdAZ29vZ2xlLmNvbT47IHRjcG1AaWV0Zi5vcmc7IGRyYWZ0LWlldGYtdGNwbS1yYWNr QHRvb2xzLmlldGYub3JnDQpTdWJqZWN0OiBSZTogW3RjcG1dIFZpY2lvdXMgb3IgVmlydHVvdXMg Y2lyY2xlPyBBZGFwdGluZyByZW9yZGVyaW5nIHdpbmRvdyB0byByZW9yZGVyaW5nIGRlZ3JlZQ0K DQoNCg0KPiBPbiBNYXIgMjcsIDIwMTgsIGF0IDg6MjQgQU0sIFByYXZlZW4gQmFsYXN1YnJhbWFu aWFuIDxwcmF2YkBtaWNyb3NvZnQuY29tPiB3cm90ZToNCj4gDQo+IGp1c3QgbWFraW5nIFRDUCBs b3NzIHJlY292ZXJ5IG1vcmUgcmVzaWxpZW50IHRvIHJlb3JkZXJpbmcgd2lsbCBub3QgYWRkcmVz cyB0aGUgcGVyZm9ybWFuY2UgaXNzdWVzIGFjcm9zcyB0aGUgZW50aXJlIGVjb3N5c3RlbSBpZiBy ZW9yZGVyaW5nIGJlY2FtZSBtb3JlIHByZXZhbGVudA0KDQpBZ3JlZWQgYnV0IHdlIHNob3VsZCBu b3QgYmUgbWFraW5nIFRDUCBtb3JlIGJyaXR0bGUgb3IgcGVyZm9ybWFuY2UtcHVuaXNoZWQgYXMg YSB0cmFkZSBmb3Ig4oCcYmx1ZSBza3nigJ0gcGVyZm9ybWFuY2UuIA0KDQpKb2UNCg== From nobody Wed Mar 28 01:43:44 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 76C41124C27 for ; Wed, 28 Mar 2018 01:43:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.311 X-Spam-Level: X-Spam-Status: No, score=-4.311 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=swm.pp.se Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id H6uptjegxNsP for ; Wed, 28 Mar 2018 01:43:42 -0700 (PDT) Received: from uplift.swm.pp.se (ipv6.swm.pp.se [IPv6:2a00:801::f]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D30FD1200C1 for ; Wed, 28 Mar 2018 01:43:41 -0700 (PDT) Received: by uplift.swm.pp.se (Postfix, from userid 501) id 72B32B1; Wed, 28 Mar 2018 10:43:40 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=swm.pp.se; s=mail; t=1522226620; bh=atJD3lgzsuGg43gGr7QC3NRDOAePjfuCSl+LzP68shE=; h=Date:From:To:Subject:From; b=1pTC1lgRfu44Nd5kaJbDO2v+az+kV3OG1yaC9GeKXbWFwAE+dGmkfuLoh4vFifdfC HCP7EOx19WFBD+Vthb4cr27uCCO/JEJUD6i5Bf+Op5QKUKplqJb8wmRaB1hs+vltUo 1liXJ5t144NfsTsdZTvs1Whw0FctMGSFMLwITRu0= Received: from localhost (localhost [127.0.0.1]) by uplift.swm.pp.se (Postfix) with ESMTP id 70C309F for ; Wed, 28 Mar 2018 10:43:40 +0200 (CEST) Date: Wed, 28 Mar 2018 10:43:40 +0200 (CEST) From: Mikael Abrahamsson To: tcpm@ietf.org Message-ID: User-Agent: Alpine 2.20 (DEB 67 2015-01-07) Organization: People's Front Against WWW MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset=US-ASCII Archived-At: Subject: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2018 08:43:43 -0000 Hi, In trying to advocate for all protocols implementing PLPMTUD (RFC4821) and shipping with it default on, I received pushback when I suggested/asked why modern TCP stacks don't come with PMTU blackhole detect turned on. Relevant reading is draft-bonica-intarea-frag-fragile-01, where PMTU blackhole is one part of this problem space. I tried turning on PMTU blackhole in Linux quickly in a case I had, and it worked around the PMTU blackhole we had for a certain deployment scenario (which couldn't be fixed unless the NMS could reconfigure the device in question, which it couldn't because PMTU blackhole existed). People suggested to me that the current TCP stack implementations are broken when it comes to PMTU blackhole detection and workaround, so that's why it's not on. What's wrong with it, and how do we fix it? -- Mikael Abrahamsson email: swmike@swm.pp.se From nobody Wed Mar 28 02:04:00 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AF4A7126BF6 for ; Wed, 28 Mar 2018 02:03:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.21 X-Spam-Level: X-Spam-Status: No, score=-4.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fpBAl61gJfff for ; Wed, 28 Mar 2018 02:03:56 -0700 (PDT) Received: from pegasus.erg.abdn.ac.uk (pegasus.erg.abdn.ac.uk [139.133.204.173]) by ietfa.amsl.com (Postfix) with ESMTP id 6FDF51200C1 for ; Wed, 28 Mar 2018 02:03:56 -0700 (PDT) Received: from auth1-smtp.messagingengine.com (auth1-smtp.messagingengine.com [66.111.4.227]) by pegasus.erg.abdn.ac.uk (Postfix) with ESMTPSA id 1A34C1B00091; Wed, 28 Mar 2018 10:03:54 +0100 (BST) Received: from compute7.internal (compute7.nyi.internal [10.202.2.47]) by mailauth.nyi.internal (Postfix) with ESMTP id 199BB217C5; Wed, 28 Mar 2018 05:03:52 -0400 (EDT) Received: from mailfrontend2 ([10.202.2.163]) by compute7.internal (MEProxy); Wed, 28 Mar 2018 05:03:52 -0400 X-ME-Sender: Received: from tom-desk.erg.abdn.ac.uk (tom-desk.erg.abdn.ac.uk [139.133.204.4]) by mail.messagingengine.com (Postfix) with ESMTPA id 92D5510259; Wed, 28 Mar 2018 05:03:51 -0400 (EDT) Date: Wed, 28 Mar 2018 10:03:33 +0100 From: Tom Jones To: Mikael Abrahamsson Cc: tcpm@ietf.org Message-ID: <20180328090333.GB88955@tom-desk.erg.abdn.ac.uk> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.2 (2017-12-15) Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2018 09:03:59 -0000 On Wed, Mar 28, 2018 at 10:43:40AM +0200, Mikael Abrahamsson wrote: > > Hi, > > In trying to advocate for all protocols implementing PLPMTUD (RFC4821) and > shipping with it default on, I received pushback when I suggested/asked > why modern TCP stacks don't come with PMTU blackhole detect turned on. > > Relevant reading is draft-bonica-intarea-frag-fragile-01, where PMTU > blackhole is one part of this problem space. > > I tried turning on PMTU blackhole in Linux quickly in a case I had, and it > worked around the PMTU blackhole we had for a certain deployment scenario > (which couldn't be fixed unless the NMS could reconfigure the device in > question, which it couldn't because PMTU blackhole existed). > > People suggested to me that the current TCP stack implementations are > broken when it comes to PMTU blackhole detection and workaround, so that's > why it's not on. > > What's wrong with it, and how do we fix it? Related discussion on the freebsd-net mailing list. https://lists.freebsd.org/pipermail/freebsd-net/2018-March/049916.html As I understand there are issues with FreeBSD increasing again after detecting a blackhole. There is not currently enough state kept to regrow the mtu. - [tj] From nobody Wed Mar 28 06:51:12 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8431712711B for ; Wed, 28 Mar 2018 06:51:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.601 X-Spam-Level: X-Spam-Status: No, score=-2.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RVv6kISOSsDP for ; Wed, 28 Mar 2018 06:51:08 -0700 (PDT) Received: from mout.gmx.net (mout.gmx.net [212.227.17.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D609D1270AC for ; Wed, 28 Mar 2018 06:51:07 -0700 (PDT) Received: from [217.70.210.6] ([217.70.210.6]) by msvc-mesg-gmx122.server.lan (via HTTP); Wed, 28 Mar 2018 15:50:20 +0200 MIME-Version: 1.0 Message-ID: From: rs.ietf@gmx.at To: pravb@microsoft.com Cc: ycheng@google.com, olivier.bonaventure@tessares.net, ietf@bobbriscoe.net, draft-ietf-tcpm-rack@tools.ietf.org, tcpm@ietf.org Content-Type: text/plain; charset=UTF-8 Importance: normal Date: Wed, 28 Mar 2018 15:50:20 +0200 Content-Transfer-Encoding: quoted-printable X-Priority: 3 X-Provags-ID: V03:K1:hHDdWDKTTLHzfzhTAY+1X9HAsi8dVoT3JcM/KOTDTGZ +xUbS05C5G7afvMfTKPtr4sO8KP8t+Lp/ITeFZZvX3OdPbXaPs SxvY8J5VPiQHfyQ1aPUsVbB4wUAn98jDLQ0HJHfodwDhmesFye RSCh7Ysx7XvqP3XfHITygiJ20jYDFaLdcvN3yMegOGONdPnC41 512ZEdYE/jQJYgRQHj+aqjdEVGcSBrI3WltK6BnSJLkI5vDuIC brcalGwXcp6t+s3tVG/y3BYj6ArA79UY6JtGzgXhJMWWEAzStP tRnyK1DLstWU3icatJfLrapsApb X-UI-Out-Filterresults: notjunk:1;V01:K0:0s9QS7s6z3o=:7xiO3SVCNfcu9P7GWju0gO yHIW9xWwKBqb4EPbcyUfzH4P5QxhMlnpb+ZpKlsByn4B6516pRJRjGcR0ICW9PhCZVecC8/dT KE2GA1cD8RgVlqbIl1Q3Pz43N0jDPZTt6EbFpRoW6bfQZWJyOU09DusmVS62JKy2339OydKAP SO7Xau0KgVhdBNK+IVGcvHkgNISOGddDsJJ0s8lkf9gQEsti/39kHyXPdstvQ3O8IbxplNeR2 eUYe14DCiQrdd8P8idCacZL8DvXkDPe5OKYanWGQgOYDRjAXKLI7Snrg9k+Uy2O2jiRH40C2r 9h4qyCmbaX6QJhdJigZ39Q5fVyCDWHUSh092oHA27/oGcxACfnOLReAkAFgiWJPZaRVXsWuht KTKpwdYW6R1iVJRM6S27VfudTR7VitglRBsSMvCxxfhZtwlTsssnMfhgcIs4b6uuSCt0gW0r/ 2E+1ELRb1VLh7+j499VaC8XDibliUtqpt0eLo7JBO726hY4ertvJoSVZxyUfFmnn0W10Zyt3q toaN03T2odMjdHMtA7DG6s= Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2018 13:51:11 -0000 For the larger TCPM audience, I want to note here, that nvo3 wg is looking for packet spraying (per-pack= et ECMP) to increase overall network bandwidth of highly meshed topologies= =2E The last-hop switch, however, is supposed to have a reorder buffer, to del= iver the packets to the client again in-sequence=2E So while the exterior view appears to be a network capable of in-order del= ivery, the impact of this would be increased network delay (reorder buffer = until a short timeout expires, or all in-sequence packets arrived at that b= uffer)=2E=2E=2E I believe, currently this design (reorder buffer on the last hop of the ne= twork) is a reasonable approach based on current expectations of network de= lay and protocols deployed, this may not cater for all users (especially at= the extremely low latency end of the spectrum, e=2Eg=2E RDMA use cases)=2E If any of you have strong opinions on this, please check with the authors = of https://tools=2Eietf=2Eorg/html/draft-xiang-nvo3-geneve-packet-spray-00 Best regards, Richard -----Urspr=C3=BCngliche Nachricht----- Von: "Praveen Balasubramanian" Gesendet: Montag, 26=2E M=C3=A4rz 2018 17:45 An: "Yuchung Cheng" ; "Olivier Bonaventure" ; "Bob Briscoe" Cc: "draft-ietf-tcpm-rack@tools=2Eietf=2Eorg" ; "tcpm@ietf=2Eorg" Betreff: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window= to reordering degree There are a lot of assumptions in not just host TCPIP stacks but in networ= king stack in general that reordering is not the common case=2E We put in a= lot of work to make the common in order case work blazingly fast all the w= ay from the hardware to the software stack=2E Yes the stack needs to tolera= te some reordering but we are not ready for a world where networks build in= reordering as a common case=2E Any such behavior will cause severe perform= ance issues=2E How about if the draft specify a minimum reordering threshold in time (RTT= /4) and number of packets (3) and leaves the further extension of increasin= g the threshold as an optional improvement to handle bad network behavior? = Without doing tests I cannot determine the memory and CPU impact of allowin= g it to grow to SRTT worth in time domain=2E Also I worry about what Bob is= saying that this could become a vicious cycle with increasing reordering -= - and even if we fix RACK the rest of hardware and software stack will not = be ready for it=2E Deliberate reordering is not an acceptable network behav= ior, it should only happen during rare events like route flaps or ECMP flap= s=2E Thanks From: tcpm [mailto:tcpm-bounces@ietf=2Eorg] On Behalf Of Olivier Bonaventu= re Sent: Thursday, March 22, 2018 12:48 PM To: Bob Briscoe Cc: tcpm@ietf=2Eorg; draft-ietf-tcpm-rack@tools=2Eietf=2Eorg Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window= to reordering degree Bob, What I was trying to say at the tcpm mic just now=2E This could be considered as a first draft of the text you asked me to writ= e=2E=2E=2E=2E The Bigger Picture The reordering degree of a link is not a constant=2E It evolves (over year= s) dependent on TCP=2E * From a link designers viewpoint, parallelizing (eg=2E link bonding) = is the easiest way to get their link to go faster * So their main constraint on speed is reordering and there is huge= pressure on them to relax that constraint * The /only/ thing that is holding them back from introducing more = reordering is the 3 dupacks in TCP or the RTT/4 rule in RACK-02 * It is likely RACK will become widespread * Given RACK-03 now adapts to the reordering window, link designers wi= ll introduce more reordering * That is GOOD (virtuous circle), but only up to a point (vicious circ= le)=2E * We need to write down what that point is * We need to ensure the algorithm stops adapting at that point=2E I agree that parallelising is a nice way to expand the capacity of links, = typically in the access=2E However, link designers should not assume that t= hey can parallelise whatever they want and let TCP figure out what is happe= ning and solve any issue=2E If TCP packets are sent over two parallel links that have similar characte= ristic, then it should work fine=2E=2E However, as soon as one of these lin= ks has different characteristics (in terms of delay, bandwidth, congestion,= packet losses), TCP will have difficulties to understand what is happening= in the network if it cannot know which packet is sent over which link=2E A= better approach when bonding access links is to expose them to a multipath= capable transport layer and let it figure out the characteristics of the d= ifferent links and use them efficiently=2E=2E With IPv6, access link design= ers have the ability to expose multiple addresses to the endhosts and we sh= ould encourage this behaviour when those addresses correspond to links with= different characteristics Olivier ________________________________ DISCLAIMER=2E This email and any files transmitted with it are confidential and intended= solely for the use of the individual or entity to whom they are addressed= =2E If you have received this email in error please notify the system manag= er=2E This message contains confidential information and is intended only f= or the individual named=2E If you are not the named addressee you should no= t disseminate, distribute or copy this e-mail=2E Please notify the sender i= mmediately by e-mail if you have received this e-mail by mistake and delete= this e-mail from your system=2E If you are not the intended recipient you = are notified that disclosing, copying, distributing or taking any action in= reliance on the contents of this information is strictly prohibited=2E _______________________________________________ tcpm mailing list tcpm@ietf=2Eorg https://www=2Eietf=2Eorg/mailman/listinfo/tcpm From nobody Wed Mar 28 06:56:38 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CAA48127286 for ; 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charset=utf-8 Mime-Version: 1.0 (1.0) From: Joe Touch X-Mailer: iPad Mail (15D100) In-Reply-To: Date: Wed, 28 Mar 2018 06:56:27 -0700 Cc: pravb@microsoft.com, tcpm@ietf.org, draft-ietf-tcpm-rack@tools.ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: <8D63234B-67FC-4C0D-93CA-C37D07DC4494@strayalpha.com> References: To: rs.ietf@gmx.at X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2018 13:56:38 -0000 > On Mar 28, 2018, at 6:50 AM, rs.ietf@gmx.at wrote: >=20 > I want to note here, that nvo3 wg is looking for packet spraying (per-pack= et ECMP) to increase overall network bandwidth of highly meshed topologies. >=20 > The last-hop switch, however, is supposed to have a reorder buffer, to del= iver the packets to the client again in-sequence. We have different ideas of what the =E2=80=9CEC=E2=80=9D in ECMP mean. If you have to reorder, then they=E2=80=99re not equal cost. Joe= From nobody Wed Mar 28 07:03:32 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2EFB112711E for ; Wed, 28 Mar 2018 07:03:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 28cNJ7bpA8c9 for ; Wed, 28 Mar 2018 07:03:25 -0700 (PDT) Received: from mout.gmx.net (mout.gmx.net [212.227.15.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7064512711B for ; Wed, 28 Mar 2018 07:03:24 -0700 (PDT) Received: from [217.70.210.6] ([217.70.210.6]) by msvc-mesg-gmx123.server.lan (via HTTP); Wed, 28 Mar 2018 16:03:21 +0200 MIME-Version: 1.0 Message-ID: From: rs.ietf@gmx.at To: tom@erg.abdn.ac.uk Cc: swmike@swm.pp.se, tcpm@ietf.org Content-Type: text/plain; charset=UTF-8 Importance: normal Date: Wed, 28 Mar 2018 16:03:21 +0200 Content-Transfer-Encoding: quoted-printable X-Priority: 3 X-Provags-ID: V03:K1:8wrv5uQg9jxdZTHTEUX4HFlMwfEsZxmNF1XLu2DqvAn 1BsAyJNfnhWVfrlcZlSMw0W1J097NkhBby+tPYiohYN3Q/eal1 ttHLyCXOnmkZJa4qte3ZPpqLKTZCtY1iXA5zDmUodf665JhJcm 1a0qkPNukdbDq1IW/SuU28B+iS3XkfkarbP+67BapSRD5tvV0B 4Y938VY6gwD+KbRjIn4k0/KdOzVujFtOb8hQAjSOWgYd2OP2Ir YUHL+rd4B6KIxYPs8M+49VnpMmL/UFlGIdWDs1q0HmhOkJtTbW fcSFp+sKBjQo/GBD3w8F89Ht9qz X-UI-Out-Filterresults: notjunk:1;V01:K0:ANUL/a2rsr8=:DlwMPsVsc0adLH/RPsMxXL ZVi1BbuEAF9AeEXrRdMG1McgndA88FYn3HWRPqPjjvFlXc69xYw+xN7RI4C1bjtJV9pjy9EQZ aPsVr5PkLNFcdNQVxV8zbnGAOmVjvjHhsaVxpkaR5S8keuf+1BZ2MYLRQOleagAkweO8dnTGP 9Bqcq7TyOr/NfEEKFVKVIdrUuvBNq3xsoX3pN0hkEhhCtEtTiSYEvNvhnqAcoYysN+uI/WSwc lW1xlYNJFur042JKFLy493RNiMeg+nU87IF8IvawyBI1I7ci2yzmiFQZWmt+i4Y3/88jYRgzs RPl37BDiMXjA0hDTT6uLd5WHSs76vYHxDjqt2qNC++raxFr6WzBs7fmEz5eddcDDj8QKQ2xCo RTW8J/L9SzL7hIM1lokScgDlft8WDtXIAvWHEev6WArbXybxaId/xzyR/eBHV3ktP0BJ/VD9J kfRK76WpP4y6r1r85QbBRtjFNI21EjDXcPUit062B4Lo1HfWHn1IydTp+0svNsoGJ11IgJ+WR +NuEf96PPVmeVIBsDDaNrc= Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2018 14:03:31 -0000 Mikael, Yes, the main concern raised there (and in private conversations, also her= e) was a perceived performance impact when there is a false positive=2E Also, the (rfc4821) probing upwards is often not fully implemented due to = its complexity, and the obvious chance (with TCP) of causing a loss that ha= s to be recovered (but IMHO nothing speaks against probing with a larger se= gment, immediately followed with a known-ok sized segment, using the ACK se= quence number to validate if the probe went ok)=2E At least for BSD, there is still some work to be done, before it is 4821 c= ompliant=2E=2E=2E Best regards, Richard =20 -----Urspr=C3=BCngliche Nachricht----- Von: "Tom Jones" Gesendet: Mittwoch, 28=2E M=C3=A4rz 2018 11:03 An: "Mikael Abrahamsson" Cc: tcpm@ietf=2Eorg Betreff: Re: [tcpm] PLPMTUD for all protocols On Wed, Mar 28, 2018 at 10:43:40AM +0200, Mikael Abrahamsson wrote: >=20 > Hi, >=20 > In trying to advocate for all protocols implementing PLPMTUD (RFC4821) a= nd=20 > shipping with it default on, I received pushback when I suggested/asked= =20 > why modern TCP stacks don't come with PMTU blackhole detect turned on=2E >=20 > Relevant reading is draft-bonica-intarea-frag-fragile-01, where PMTU=20 > blackhole is one part of this problem space=2E >=20 > I tried turning on PMTU blackhole in Linux quickly in a case I had, and = it=20 > worked around the PMTU blackhole we had for a certain deployment scenari= o=20 > (which couldn't be fixed unless the NMS could reconfigure the device in= =20 > question, which it couldn't because PMTU blackhole existed)=2E >=20 > People suggested to me that the current TCP stack implementations are=20 > broken when it comes to PMTU blackhole detection and workaround, so that= 's=20 > why it's not on=2E >=20 > What's wrong with it, and how do we fix it? Related discussion on the freebsd-net mailing list=2E https://lists=2Efreebsd=2Eorg/pipermail/freebsd-net/2018-March/049916=2Eht= ml As I understand there are issues with FreeBSD increasing again after detecting a blackhole=2E There is not currently enough state kept to regrow the mtu=2E=20 - [tj] _______________________________________________ tcpm mailing list tcpm@ietf=2Eorg https://www=2Eietf=2Eorg/mailman/listinfo/tcpm From nobody Wed Mar 28 07:58:53 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E5161128954; Wed, 28 Mar 2018 07:58:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.211 X-Spam-Level: X-Spam-Status: No, score=-4.211 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qtn1hpLqXRxb; Wed, 28 Mar 2018 07:58:41 -0700 (PDT) Received: from rfc-editor.org (rfc-editor.org [4.31.198.49]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1EC20124F57; Wed, 28 Mar 2018 07:58:41 -0700 (PDT) Received: by rfc-editor.org (Postfix, from userid 30) id 36E77B822EB; Wed, 28 Mar 2018 07:58:12 -0700 (PDT) To: bew@cisco.com, gregory.ietf@gmail.com, ekr@rtfm.com X-PHP-Originating-Script: 30:errata_mail_lib.php From: RFC Errata System Cc: ietf@kuehlewind.net, iesg@ietf.org, tcpm@ietf.org, rfc-editor@rfc-editor.org Content-Type: text/plain; charset=UTF-8 Message-Id: <20180328145812.36E77B822EB@rfc-editor.org> Date: Wed, 28 Mar 2018 07:58:12 -0700 (PDT) Archived-At: Subject: [tcpm] [Errata Rejected] RFC5926 (5267) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2018 14:58:43 -0000 The following errata report has been rejected for RFC5926, "Cryptographic Algorithms for the TCP Authentication Option (TCP-AO)". -------------------------------------- You may review the report below and at: http://www.rfc-editor.org/errata/eid5267 -------------------------------------- Status: Rejected Type: Technical Reported by: Brian Weis Date Reported: 2018-02-26 Rejected by: Mirja Kühlewind (IESG) Section: 3.1.1 Original Text ------------- - Label: A binary string that clearly identifies the purpose of this KDF's derived keying material. For TCP-AO, we use the ASCII string "TCP-AO", where the last character is the capital letter "O", not to be confused with a zero. While this may seem like overkill in this specification since TCP-AO only describes one call to the KDF, it is included in order to comply with FIPS 140 certifications. Corrected Text -------------- - Label: A binary string that clearly identifies the purpose of this KDF's derived keying material. For TCP-AO, we use the ASCII string "TCP-AO", where the last character is the capital letter "O", not to be confused with a zero. The ASCII string is terminated with a null octet (0x00). While this may seem like overkill in this specification since TCP-AO only describes one call to the KDF, it is included in order to comply with FIPS 140 certifications. Notes ----- This section states that "Both of these KDFs are based on the iteration-mode KDFs specified in [NIST-SP800-108].", which is later clarified to be the "counter mode" KDF defined in that document. The definition of the "Label" input to the KDF in the original text is not clear. [NIST-SP800-108] specifies that a 0x00 octet should follow the Label. This 0x00 octet is important when the KDF does not have control over the Context given it, which is the case here -- RFC 5926 depends on the definition in RFC 5925. RFC 5925 currently declares two fixed-size inputs for the Context (See Figures 7 & 8 of RFC 5925), so the Context length differs. Also, RFC 5925 RFC could be updated over over time to include other Contexts that are variable sized. The risk of excluding 0x00 is enabling an attacker to choose a specially-crafted Context that violates the clean separation between the Label and Context arguments. Therefore, it is important to include the 0x00 octet for TCP-AO. I believe this 0x00 is implied in the specification of the string "TCP-AO", since conventionally many string definitions include a trailing 0x00 octet, The text should state that the 0x00 octet is present as part of the string. If this errata does not result in adding the 0x00 octet, then its omission needs to be justified. --VERIFIER NOTES-- NIST-SP800-108 does not require the use of 0x00. It only requires that the length and order of each field be defined unambiguously. The method of providing that length unambiguously to the KDF algorithm is an implementation issue. -------------------------------------- RFC5926 (draft-ietf-tcpm-tcp-ao-crypto-03) -------------------------------------- Title : Cryptographic Algorithms for the TCP Authentication Option (TCP-AO) Publication Date : June 2010 Author(s) : G. Lebovitz, E. Rescorla Category : PROPOSED STANDARD Source : TCP Maintenance and Minor Extensions Area : Transport Stream : IETF Verifying Party : IESG From nobody Wed Mar 28 08:26:47 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9C4FD127419 for ; Wed, 28 Mar 2018 08:26:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JjH8PBLQxuFk for ; Wed, 28 Mar 2018 08:26:43 -0700 (PDT) Received: from magic.dirtside.com (magics.dirtside.com [199.33.225.25]) by ietfa.amsl.com (Postfix) with ESMTP id 3EDFF1273B1 for ; Wed, 28 Mar 2018 08:26:42 -0700 (PDT) Received: from minoc.dirtside.com (minoc.dirtside.com [70.184.240.82]) by magic.dirtside.com (8.14.3/) with ESMTP id w2SFQX60020501 for ; Wed, 28 Mar 2018 11:26:33 -0400 X-Really-To: Received: from mail-pl0-f52.google.com (mail-pl0-f52.google.com [209.85.160.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by minoc.dirtside.com (Postfix) with ESMTPSA id 51934EBF92 for ; Wed, 28 Mar 2018 11:26:33 -0400 (EDT) Received: by mail-pl0-f52.google.com with SMTP id f5-v6so1778493plj.13 for ; Wed, 28 Mar 2018 08:26:33 -0700 (PDT) X-Gm-Message-State: AElRT7HFEU/B7WsCbN2Lr/2OHFSVTzo7HcQ3zp/ETMc10n/JIs1NmlF4 xC0eE/wFP3xauCxWFblF6dWHIcQzZx3nKZs4YBg= X-Google-Smtp-Source: AIpwx48B+tOSts7qcTB4CgnxZTRHNMir6/UbP1/szI60yeYcmOCLKdJKk2tIhIoGAXosO860njWyvIF0ZV8ca3+5DnU= X-Received: by 2002:a17:902:8602:: with SMTP id f2-v6mr4185170plo.73.1522250792334; Wed, 28 Mar 2018 08:26:32 -0700 (PDT) MIME-Version: 1.0 Received: by 10.100.183.67 with HTTP; Wed, 28 Mar 2018 08:26:11 -0700 (PDT) In-Reply-To: References: From: William Herrin Date: Wed, 28 Mar 2018 11:26:11 -0400 X-Gmail-Original-Message-ID: Message-ID: To: Mikael Abrahamsson Cc: tcpm@ietf.org Content-Type: text/plain; charset="UTF-8" X-Spam-Checker: magic.dirtside.com Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2018 15:26:46 -0000 On Wed, Mar 28, 2018 at 4:43 AM, Mikael Abrahamsson wrote: > In trying to advocate for all protocols implementing PLPMTUD (RFC4821) and > shipping with it default on, I received pushback when I suggested/asked why > modern TCP stacks don't come with PMTU blackhole detect turned on. Hi Mikael, My knee-jerk response reading the RFC is that the up-probe process seems very brittle with layer violations all over the place. > What's wrong with it, and how do we fix it? Don't attempt a layer-3 general purpose solution that boils down to a large set of dirty hacks? Spitballing here, but in TCP you could create an option for the remote to respond with the largest received fragment size when a fragmented packet is received and if the option is negotiated then send the up-probes with the DF bit cleared. If the remote doesn't support it, shrink the MSS but don't try to grow it again. If the remote does respond with the largest fragment size then you get the exact path MTU as a result of one probe without disrupting the communication flow. Sacrilege to suggest sending anything without the DF bit set, but if the router's return has a black hole, maybe the answer is to let the router communicate forward instead. Regards, Bill Herrin -- William Herrin ................ herrin@dirtside.com bill@herrin.us Dirtside Systems ......... Web: From nobody Wed Mar 28 08:51:52 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2F3DE127369 for ; Wed, 28 Mar 2018 08:51:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.311 X-Spam-Level: X-Spam-Status: No, score=-4.311 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=swm.pp.se Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jaSLe03FMC9O for ; Wed, 28 Mar 2018 08:51:36 -0700 (PDT) Received: from uplift.swm.pp.se (swm.pp.se [212.247.200.143]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 36AE512D882 for ; Wed, 28 Mar 2018 08:51:36 -0700 (PDT) Received: by uplift.swm.pp.se (Postfix, from userid 501) id 1D9F5B0; Wed, 28 Mar 2018 17:51:34 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=swm.pp.se; s=mail; t=1522252294; bh=QhNciybE9zXmkVBL2bIfgzAcZCdxipbm5yUnWQe8nxk=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=u2tU43TFusIANDalgKQUZiQ0s14kBW75d/DEcHhXKwAMj4ZkRH/or1jynr3NFP4AE fs00oWmPGgtF4sXzimmzOzGuLkIu5ixg002o0JY3K9O2HbyLKOBcPw1JJVQl5EZ+Ns YGy4sKZca4sQzZTaAhLDULC4BdFD+yRzaL3aqKoQ= Received: from localhost (localhost [127.0.0.1]) by uplift.swm.pp.se (Postfix) with ESMTP id 1B496AF; Wed, 28 Mar 2018 17:51:34 +0200 (CEST) Date: Wed, 28 Mar 2018 17:51:34 +0200 (CEST) From: Mikael Abrahamsson To: William Herrin cc: tcpm@ietf.org In-Reply-To: Message-ID: References: User-Agent: Alpine 2.20 (DEB 67 2015-01-07) Organization: People's Front Against WWW MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2018 15:51:45 -0000 On Wed, 28 Mar 2018, William Herrin wrote: > Sacrilege to suggest sending anything without the DF bit set, but if the > router's return has a black hole, maybe the answer is to let the router > communicate forward instead. 1. IPv6 doesn't have a DF bit that can be on or off, it's always implicitly on. 2. Fragmentation doesn't usually happen if there is PMTUD blackhole. So I have no idea how to come to a best conclusion regarding the tradeoff between "doesn't work at all" and "doesn't work optimally in some cases". Generally, I'd be happy with a blackhole detect that falls back to low MTU (576 for IPv4, 1280 for IPv6) whenever there seems to be a real blackhole, and be very cautious in going back up again in MSS. Right now I would like things to be more resilient to complete failure than what TCP is today without blackhole detect. -- Mikael Abrahamsson email: swmike@swm.pp.se From nobody Wed Mar 28 12:42:19 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0C9F412762F for ; Wed, 28 Mar 2018 12:42:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.8 X-Spam-Level: X-Spam-Status: No, score=-6.8 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, SPF_PASS=-0.001, T_DKIM_INVALID=0.01, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=neutral reason="invalid (public key: DNS error: SERVFAIL)" header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 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with mapi id 15.00.1320.000; Wed, 28 Mar 2018 15:42:11 -0400 From: "Brian Weis (bew)" To: Joe Touch CC: RFC Editor , "ekr@rtfm.com" , "tuexen@fh-muenster.de" , "tcpm@ietf.org" , "ietf@kuehlewind.net" Thread-Topic: [tcpm] [Technical Errata Reported] RFC5926 (5267) Thread-Index: AQHTrzRUQnxFC2fU6E29LS3A6LD6RA== Date: Wed, 28 Mar 2018 19:42:11 +0000 Message-ID: <8B1FAC72-2B18-4406-A3D3-E3BE5524EB59@cisco.com> References: <20180226190209.F3D43B80E1F@rfc-editor.org> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.32.222.150] Content-Type: multipart/alternative; boundary="_000_8B1FAC722B184406A3D3E3BE5524EB59ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [tcpm] [Technical Errata Reported] RFC5926 (5267) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2018 19:42:18 -0000 --_000_8B1FAC722B184406A3D3E3BE5524EB59ciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgSm9lLA0KDQpTb3JyeSwgSSBtaXNzZWQgeW91ciByZXBseSB0byB0aGlzIGJlZm9yZSB0aGUg ZXJyYXRhIHdhcyByZWplY3RlZC4NCg0KT24gRmViIDI4LCAyMDE4LCBhdCA2OjU2IEFNLCBKb2Ug VG91Y2ggPHRvdWNoQHN0cmF5YWxwaGEuY29tPG1haWx0bzp0b3VjaEBzdHJheWFscGhhLmNvbT4+ IHdyb3RlOg0KDQpIaSwgYWxsLA0KDQpUaGlzIGVycmF0YSBzaG91bGQgYmUgcmVqZWN0ZWQuDQoN Ck5JU1QtU1A4MDAtMTA4IGRvZXMgbm90IHJlcXVpcmUgdGhlIHVzZSBvZiAweDAwIChzZWUgY2l0 ZWQgdGV4dCBiZWxvdykuIEl0IG9ubHkgcmVxdWlyZXMgdGhhdCB0aGUgbGVuZ3RoIGFuZCBvcmRl ciBvZiBlYWNoIGZpZWxkIGJlIGRlZmluZWQgdW5hbWJpZ3VvdXNseS4NCg0KVGhpcyBpcyBjb3Jy ZWN0LiBUaGUgaXNzdWUgaXMgd2hldGhlciBhbGwgVENQLUFPIGltcGxlbWVudGF0aW9ucyBpbXBs ZW1lbnRpbmcgTklTVCBTUDgwMC0xMDggYWxsIGFkZCB0aGUgMHgwMCBvciBub3QuIElmIHRoZXJl 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n4y1uGsaYw47RIGj9D2EKUznzyC4cr0y0uSKfkiHB2u/5wVvl8xzzh16GF6OmR64CS3hfgnznQ1i9 a2VGI8z0i61sP/4ZOD8oPulA0+yJUL28K1UY+lJ7MhFQ2v6uMcmOV9F1r2Nfw/ia8Dl2hL1ltuWIn t5oz5UxBQ==; Received: from host-79-78-166-168.static.as9105.net ([79.78.166.168]:37276 helo=[192.168.2.6]) by server.dnsblock1.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89_1) (envelope-from ) id 1f1Jw6-0002D2-8y; Wed, 28 Mar 2018 23:52:54 +0100 To: Yuchung Cheng , Praveen Balasubramanian Cc: Olivier Bonaventure , "tcpm@ietf.org" , "draft-ietf-tcpm-rack@tools.ietf.org" References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <284E217A-4A12-4EC1-A9C6-52B6FFF67FFD@tessares.net> From: Bob Briscoe Message-ID: Date: Wed, 28 Mar 2018 23:52:53 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------92C6B89A11D5DA889D8710A6" Content-Language: en-GB X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.dnsblock1.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - bobbriscoe.net X-Get-Message-Sender-Via: server.dnsblock1.com: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: server.dnsblock1.com: in@bobbriscoe.net Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2018 22:53:01 -0000 This is a multi-part message in MIME format. --------------92C6B89A11D5DA889D8710A6 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Yuchung, On 26/03/18 17:15, Yuchung Cheng wrote: > There are two action items > 1) clarify the reo_wnd policy further At present the draft largely just states the algo without much rationale. Now I understand the DSACK-based algo, I have realized it contains subtleties that I try to articulate below (pls use as text if you want). Correct me if I'm wrong, but over the years I have detected a (perhaps unstated) presumption from some in the TCP community that their aim is to eliminate all spurious retransmissions. The DSACK algo doesn't fall into that trap, but superficially it looks as if it does. The subtle part is that it starts off with the 3 DUPACK rule {Note 1}, then grows the reordering window from there as long as at least one {Note 2} spurious retransmission per RTT is detected. So, for short flows (or the beginning of long flows), even if the degree of reordering is high: * losses will be repaired fast, which is important for short-flow latency * and spurious retransmissions will be tolerated, which is OK for a few RTTs If a flow lasts longer, and if the reordering degree is high, the reordering window will grow, so: * losses will take longer to repair, which is not such a concern for elephants {Note 3} * spurious retransmissions will be reduced, because the bandwidth efficiency of elephants dominates overall bandwidth efficiency. I think it's important for the draft to explain that it deliberately starts by tolerating more spurious retransmissions to keep repair delay low for short flows. IOW, it would not be entirely appropriate to cache the reordering window learned from prior connections over the same path. Cheers Bob {Note 1}: Alternative initial rules This could be replaced with a duration in units of time, e.g. SRTT/4, but I understand that you wanted to start with traditional behaviour, so as not to trigger intrusion detection systems or protocol compliance checkers that might punish non-traditional behaviour. {Note 2}: At least one? Rather than counting the existence of at least one spurious retransmission per RTT, I think it would be preferable to count their extent. Then the algo would be collecting the metrics it needs to trade off a residual rate of spurious retransmissions against longer delay to repair losses. Instead, it keeps on extending the reordering window in response to even one spurious retransmission per RTT, whatever the cost in delayed loss-recovery (up to the arbitrary hard limit of 1 SRTT). {Note 3}: Not all elephants are the same. If an elephant is a single bulk file download, the delay repairing losses has negligible effect on performance. However, what looks like an elephant from the outside might actually by numerous multiplexed small streams (e.g. http2). Then delay repairing losses remains significant, potentially holding back a small object with potential collateral damage to latency delivering other objects stuck behind the loss (HoL blocking). Conclusion: TCP still needs to trade off delay repairing losses against spurious retransmissions, even for elephants. -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/ --------------92C6B89A11D5DA889D8710A6 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit Yuchung,

On 26/03/18 17:15, Yuchung Cheng wrote:
There are two action items
1) clarify the reo_wnd policy further

At present the draft largely just states the algo without much rationale. Now I understand the DSACK-based algo, I have realized it contains subtleties that I try to articulate below (pls use as text if you want).

Correct me if I'm wrong, but over the years I have detected a (perhaps unstated) presumption from some in the TCP community that their aim is to eliminate all spurious retransmissions. The DSACK algo doesn't fall into that trap, but superficially it looks as if it does.

The subtle part is that it starts off with the 3 DUPACK rule {Note 1}, then grows the reordering window from there as long as at least one {Note 2} spurious retransmission per RTT is detected. So, for short flows (or the beginning of long flows), even if the degree of reordering is high:
  • losses will be repaired fast, which is important for short-flow latency
  • and spurious retransmissions will be tolerated, which is OK for a few RTTs
If a flow lasts longer, and if the reordering degree is high, the reordering window will grow, so:
  • losses will take longer to repair, which is not such a concern for elephants {Note 3}
  • spurious retransmissions will be reduced, because the bandwidth efficiency of elephants dominates overall bandwidth efficiency.
I think it's important for the draft to explain that it deliberately starts by tolerating more spurious retransmissions to keep repair delay low for short flows. IOW, it would not be entirely appropriate to cache the reordering window learned from prior connections over the same path.

Cheers


Bob

{Note 1}: Alternative initial rules
This could be replaced with a duration in units of time, e.g. SRTT/4, but I understand that you wanted to start with traditional behaviour, so as not to trigger intrusion detection systems or protocol compliance checkers that might punish non-traditional behaviour.

{Note 2}: At least one?
Rather than counting the existence of at least one spurious retransmission per RTT, I think it would be preferable to count their extent. Then the algo would be collecting the metrics it needs to trade off a residual rate of spurious retransmissions against longer delay to repair losses. Instead, it keeps on extending the reordering window in response to even one spurious retransmission per RTT, whatever the cost in delayed loss-recovery (up to the arbitrary hard limit of 1 SRTT).

{Note 3}: Not all elephants are the same.
If an elephant is a single bulk file download, the delay repairing losses has negligible effect on performance. However, what looks like an elephant from the outside might actually by numerous multiplexed small streams (e.g. http2). Then delay repairing losses remains significant, potentially holding back a small object with potential collateral damage to latency delivering other objects stuck behind the loss (HoL blocking). Conclusion: TCP still needs to trade off delay repairing losses against spurious retransmissions, even for elephants.


-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/
--------------92C6B89A11D5DA889D8710A6-- From nobody Wed Mar 28 16:09:52 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B0D2112895E for ; Wed, 28 Mar 2018 16:09:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=bobbriscoe.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VAwZiRSwuDDP for ; Wed, 28 Mar 2018 16:09:50 -0700 (PDT) Received: from server.dnsblock1.com (server.dnsblock1.com [85.13.236.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EACD71271FD for ; Wed, 28 Mar 2018 16:09:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=bobbriscoe.net; s=default; h=Content-Type:In-Reply-To:MIME-Version:Date: Message-ID:Cc:From:References:To:Subject:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=WHWehnSEoEmLQzaMQej2C2i5e6x5J2xT7OT5/it9Yls=; b=9H/oGMaUa4ILfwMY3HkyPbPhM vJhACdeKBkoiKoZIfpyQp4VokIvyUZsZZoMLge2smrpXP+f90hFq07Ffk/ELW1SIqcwTYIXkTLr+m lNwuUTWeTbYzkRog1RY7wdKvZTJv1sx5Txh1sHf33O/JObfjKoZU221b38UCPGy9irB2XP9GJlLH/ 6ZWJzKU2KR4MU+Djq3z+Zfu189jRe6LZIgd2KPM66sk1T6zbNZxePOkKzW6XLnrANTIxVcNE+CkG6 WazQAEw0fVDsimHEd5eLhCWoglhEapnbPpzf5RMi0e/2zRwQIjOn8Hrcr4SquQEodAJU9uVn+XSNQ h4zua9lSw==; Received: from host-79-78-166-168.static.as9105.net ([79.78.166.168]:37450 helo=[192.168.2.6]) by server.dnsblock1.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89_1) (envelope-from ) id 1f1KCR-00042I-Sg; Thu, 29 Mar 2018 00:09:48 +0100 To: Yuchung Cheng References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <1c5bef94-eb4f-7aab-0b6b-cb2d02da7a9a@bobbriscoe.net> From: Bob Briscoe Cc: draft-ietf-tcpm-rack@tools.ietf.org, "tcpm@ietf.org Extensions" Message-ID: <6a451b96-af61-f5c8-87a9-9968e99027de@bobbriscoe.net> Date: Thu, 29 Mar 2018 00:09:47 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------8BB2EAF74169AE26A295E20E" Content-Language: en-GB X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.dnsblock1.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - bobbriscoe.net X-Get-Message-Sender-Via: server.dnsblock1.com: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: server.dnsblock1.com: in@bobbriscoe.net Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Mar 2018 23:09:52 -0000 This is a multi-part message in MIME format. --------------8BB2EAF74169AE26A295E20E Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Yuchung, On 21/03/18 11:31, Yuchung Cheng wrote: >> I think different applications will have different answers - but I suspect >> we could make a guess in TCP and not need a socket option. >> >> However, it's important not to punt difficult but important questions. >> It's not safe for tcpm to let you drive this car, if no-one has a clue where >> the brake is. > RACK reo_wnd max is SRTT --> I am open to discuss alternatives but not > under such offensive tone. > > How is this punting? I merely meant "how TCP should handle reordering" > may be out-of-scope of a specific loss recovery mechanism -- RACK is > not the only one and would not be the last one. > > RACK can not become an RFC w/o consensus no matter what > > I ask the chairs to moderate. > 1) Sorry if the way I wrote this caused offence - none intended. "...if no-one has a clue" was not aimed just at you, it was aimed at the whole WG. I am saying that we are entering dangerous territory if we know we are creating a vicious cycle, but we don't know where to stop it. Just guessing a max limit (1 SRTT) isn't enough. So IMO we should not proceed until someone can give at least some sort of credible reasoning for the choice of number (I'm afraid I can't). Intuitively, a ceiling of 1 SRTT seems of the right order for a long-running flow. And starting at RTT/4 seems about right for short flows. But I haven't studied the tradeoffs enough to give a reasoned argument. I have a feel for the user trade off here (delay recovering losses vs. bandwidth efficiency), but I don't know how to factor in Praveen's concerns about memory and CPU performance as well. To be clear, I think RACK is very important, and I want it deployed quickly. But if we punt on this question, there will never be a point later at which we are forced to find an answer. In the longer term, the potential harm could grow to be greater than the benefit of RACK. (Akin to the square root scaling in TCP that was punted in 1988, even tho it was known to be unscalable and gradually came back to bite us.) 2) Altho the last line of the pseudocode for step 3 in the draft implements an upper limit to RACK.reo_wnd, there's nothing in the English description (Extension 1 under section 5.2) about this limit. I believe it is important that the draft says: * there "MUST" be an upper limit to RACK's adaptation to the network's reordering degree. * why this is necessary - to break the potential vicious cycle * why the particular value of the upper limit (currently 1 SRTT) has been chosen Bob -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/ --------------8BB2EAF74169AE26A295E20E Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit Yuchung,

On 21/03/18 11:31, Yuchung Cheng wrote:
I think different applications will have different answers - but I suspect
we could make a guess in TCP and not need a socket option.

However, it's important not to punt difficult but important questions.
It's not safe for tcpm to let you drive this car, if no-one has a clue where
the brake is.

RACK reo_wnd max is SRTT --> I am open to discuss alternatives but not
under such offensive tone.

How is this punting? I merely meant "how TCP should handle reordering"
may be out-of-scope of a specific loss recovery mechanism -- RACK is
not the only one and would not be the last one.

RACK can not become an RFC w/o consensus no matter what

I ask the chairs to moderate.

1) Sorry if the way I wrote this caused offence - none intended.
"...if no-one has a clue" was not aimed just at you, it was aimed at the whole WG.

I am saying that we are entering dangerous territory if we know we are creating a vicious cycle, but we don't know where to stop it. Just guessing a max limit (1 SRTT) isn't enough. So IMO we should not proceed until someone can give at least some sort of credible reasoning for the choice of number (I'm afraid I can't).

Intuitively, a ceiling of 1 SRTT seems of the right order for a long-running flow. And starting at RTT/4 seems about right for short flows. But I haven't studied the tradeoffs enough to give a reasoned argument. I have a feel for the user trade off here (delay recovering losses vs. bandwidth efficiency), but I don't know how to factor in Praveen's concerns about memory and CPU performance as well.

To be clear, I think RACK is very important, and I want it deployed quickly. But if we punt on this question, there will never be a point later at which we are forced to find an answer. In the longer term, the potential harm could grow to be greater than the benefit of RACK. (Akin to the square root scaling in TCP that was punted in 1988, even tho it was known to be unscalable and gradually came back to bite us.)


2) Altho the last line of the pseudocode for step 3 in the draft implements an upper limit to RACK.reo_wnd, there's nothing in the English description (Extension 1 under section 5.2) about this limit. I believe it is important that the draft says:
  • there "MUST" be an upper limit to RACK's adaptation to the network's reordering degree.
  • why this is necessary - to break the potential vicious cycle
  • why the particular value of the upper limit (currently 1 SRTT) has been chosen



Bob

-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/
--------------8BB2EAF74169AE26A295E20E-- From nobody Wed Mar 28 17:06:14 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 247041205F0 for ; Wed, 28 Mar 2018 17:06:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.001 X-Spam-Level: X-Spam-Status: No, score=-2.001 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=bobbriscoe.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wqN1DfdE8jAS for ; Wed, 28 Mar 2018 17:06:11 -0700 (PDT) Received: from server.dnsblock1.com (server.dnsblock1.com [85.13.236.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 175E7126CC4 for ; Wed, 28 Mar 2018 17:06:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=bobbriscoe.net; s=default; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To:Subject:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=0XSlgbv3kbyxJbMPY/AbyFJ60dy5CiDcKLoWMZcjywU=; b=ejt1J9RI5RaYWPOAcp4VP8YXyS JLp3g2KNSR4T96C7UacVE8uUhb/oML9h6KuDRTS+NDJCiQKkXdGHTDb/CWsgpI9i2Cbnx5yiXfeSM bYFMsUdxAVO8Cm0j1Il4y57hwSjYav6stlt1+JzgMIEKG9y0EkYN0o1aB+KVVXDmuGpqbTZQ4KhJw 3gsRF9ojGIhxrZeRxN++IZESBGsTr7OnqORtYUf5N01hvZdeCapd7dawW49bPnNVKXBmsrgK2SXFf 60gW9MlnQfbb4taWkmk+moZKvlATnLISOd90DzfPqYDpmbr+DXFkimXZSO/gy1vmT229MnJcQTaXi sVwq7HlQ==; Received: from [84.92.178.164] (port=38428 helo=[192.168.0.2]) by server.dnsblock1.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89_1) (envelope-from ) id 1f1L4y-0002Au-AD; Thu, 29 Mar 2018 01:06:08 +0100 To: Praveen Balasubramanian , Joe Touch Cc: Olivier Bonaventure , Yuchung Cheng , "tcpm@ietf.org" , "draft-ietf-tcpm-rack@tools.ietf.org" References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <284E217A-4A12-4EC1-A9C6-52B6FFF67FFD@tessares.net> <5784486C-1DEF-43E1-B2C7-E61DF4C19178@strayalpha.com> From: Bob Briscoe Message-ID: <060259fd-41ba-0cf1-8e35-1b5031d01caa@bobbriscoe.net> Date: Thu, 29 Mar 2018 01:06:07 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-GB X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.dnsblock1.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - bobbriscoe.net X-Get-Message-Sender-Via: server.dnsblock1.com: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: server.dnsblock1.com: in@bobbriscoe.net Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 00:06:13 -0000 Praveen, On 27/03/18 17:46, Praveen Balasubramanian wrote: > It has been this way for years. The dup thresh was defined as 3 packets a long time ago. There is no good answer for what the max threshold should be in terms of packets or time. RACK draft is proposing RTT worth but we will need a lot more data. There is trade off between CPU and memory usage here and many implementations can choose to stick to 3 packets or RTT/4. The problem with time domain is that reordering is defined as a function of RTT which is variable so you cannot design for any correct limit. If the RTT is seconds, on a high BDP link this may mean thousands of packets. If memory is limited, or if there is a processing performance limit due to the scale of the reordering buffer at the receiver, wouldn't the correct way to control that be with rwnd? Then, it occurs to me that RACK is likely to lead to much more buffering at the receiver and consequently, the connection more often being limited by rwnd. So, the RACK algo will need to be conditioned on whether the connection is cwnd-limited or rwnd-limited (I can't find anything about this in the draft). If the sender is rwnd-limited, I think RACK would need to reduce the reordering window, otherwise the cost of avoiding spurious retransmissions would not just be retransmission delay, but potentially a severe limit to throughput merely because of the large reordering window behind any hole in the receive buffer. > I think we still need to define a threshold for max packets which is absolute. Nothing in RACK precludes having a max reordering threshold in number of packets. I'm not sure I agree. I think the configured max receive buffer gives you the control you need over memory usage and over the performance of the reordering process at the receiver. As long as we can work out a good way for rwnd to influence the sender's reordering window, I think that should be sufficient. Bob -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/ From nobody Wed Mar 28 21:01:24 2018 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 61B6E12778D; Wed, 28 Mar 2018 21:01:23 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: tcpm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.76.1 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <152229608335.23885.1229382205419997341@ietfa.amsl.com> Date: Wed, 28 Mar 2018 21:01:23 -0700 Archived-At: Subject: [tcpm] I-D Action: draft-ietf-tcpm-rfc793bis-08.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 04:01:23 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF. Title : Transmission Control Protocol Specification Author : Wesley M. Eddy Filename : draft-ietf-tcpm-rfc793bis-08.txt Pages : 102 Date : 2018-03-28 Abstract: This document specifies the Internet's Transmission Control Protocol (TCP). TCP is an important transport layer protocol in the Internet stack, and has continuously evolved over decades of use and growth of the Internet. Over this time, a number of changes have been made to TCP as it was specified in RFC 793, though these have only been documented in a piecemeal fashion. This document collects and brings those changes together with the protocol specification from RFC 793. This document obsoletes RFC 793, as well as 879, 2873, 6093, 6429, 6528, and 6691 that updated parts of RFC 793. It updates RFC 1122, and should be considered as a replacement for the portions of that document dealing with TCP requirements. It updates RFC 5961 due to a small clarification in reset handling while in the SYN-RECEIVED state. RFC EDITOR NOTE: If approved for publication as an RFC, this should be marked additionally as "STD: 7" and replace RFC 793 in that role. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc793bis/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-tcpm-rfc793bis-08 https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-rfc793bis-08 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rfc793bis-08 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Wed Mar 28 21:33:07 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1FF26126C0F for ; Wed, 28 Mar 2018 21:33:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.009 X-Spam-Level: X-Spam-Status: No, score=-2.009 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CXSjOdyjD-vG for ; Wed, 28 Mar 2018 21:33:03 -0700 (PDT) Received: from mail-ua0-x22e.google.com (mail-ua0-x22e.google.com [IPv6:2607:f8b0:400c:c08::22e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 73535124B0A for ; Wed, 28 Mar 2018 21:33:03 -0700 (PDT) Received: by mail-ua0-x22e.google.com with SMTP id s92so2898015uas.11 for ; Wed, 28 Mar 2018 21:33:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=mWJLu/rLfc0KrGCva51MqKkEs23P5jWpp+bC3ze5C7Q=; b=VbMC2W5AViP61TmJCQgvclanFc5hNPLHIATIh+kKPfR4U2gsDyHOSpqYu5lGozW1gQ rszyqY1uStE7owOA75XazinLverYtStcTU6US5jTBprrwiJ/4KlFoTHAil40mdh9WM4R OKyXuspZnXqN3NtmqVrTocloa9a9H5zFsUTO4t8Bc/O4JZNW8q9SyZ4zBNsaco59cY5L ISda9u89P+Dakvy76RMdqsyQXjGZeFfYSvBscYLt6wnrHks/d/BRZ1AikQKABcH2kemx /Z/DwnLa6c4jfVoUuXeyVBoytk0calZ72KN2AYBcDqCu79RRpJeiGkG2jtQQ+mWSl0Bw ZEEQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=mWJLu/rLfc0KrGCva51MqKkEs23P5jWpp+bC3ze5C7Q=; b=LlQdX+opZwUxIlfwZM9pKlTJl1l4IuiL06nF7c9ZPrrynMQbOz6GULkjH5mktEULKj x0hm3y0OYL0FHNFEx+gkpEb1UVfTmunw7H257VtlCZEHCcN8eRkbwuweWrlmhpJCYaLX Dx/uouqIwGZqd2Fx/e0sPm4EJb1LW1dFGOZlPaugP2AZmNTPpfnf7YHbwavUWWYX8ITo NoRnr7LmLDCHF+UYAEjHvjk1zXtISylr/rSngSDipUN17ErawqutARPdxYGx2LBj1di9 9LtbtU4HXnvYyBxAx2MGo+G7/pI2lODFTETFAw8SF2ZQE3AnZ5cZ6QdSoBb/CDKRaK7Z HP9Q== X-Gm-Message-State: AElRT7HlB20YEHowXS4N7a5XUsx8PBGrLKf0sm39LesnfqTQWtb+5yMJ +Sk4mg/NLi3PJwPYHMmP/buiYkYbBkGsThIXzqKl+Q== X-Google-Smtp-Source: AIpwx4/3DxKQEMsW1kmiZtdRCWxPzfy8e2jZCnRJzAHMZxIkxYScnWelzoq5kp74EJxZhUrJjoqiPTJGXTEbRleq+yE= X-Received: by 10.176.48.169 with SMTP id b9mr4403697uam.55.1522297981908; Wed, 28 Mar 2018 21:33:01 -0700 (PDT) MIME-Version: 1.0 References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <1c5bef94-eb4f-7aab-0b6b-cb2d02da7a9a@bobbriscoe.net> <6a451b96-af61-f5c8-87a9-9968e99027de@bobbriscoe.net> In-Reply-To: <6a451b96-af61-f5c8-87a9-9968e99027de@bobbriscoe.net> From: Matt Mathis Date: Thu, 29 Mar 2018 04:32:50 +0000 Message-ID: To: Bob Briscoe Cc: Yuchung Cheng , tcpm IETF list , draft-ietf-tcpm-rack@tools.ietf.org Content-Type: multipart/alternative; boundary="089e08329e90749ff20568859e07" Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 04:33:06 -0000 --089e08329e90749ff20568859e07 Content-Type: text/plain; charset="UTF-8" > > I believe it is important that the draft says: > > - there "MUST" be an upper limit to RACK's adaptation to the network's > reordering degree. > - why this is necessary - to break the potential vicious cycle > - why the particular value of the upper limit (currently 1 SRTT) has > been chosen > > Yes, however I would amend this s/MUST/SHOULD/ and add text qualifying the SHOULD (which I volunteered to write). One of my goals (for years) has been to enable more parallelism in the network by further relaxing the operational/performance constraint that packets be in order. In the aftermath of the Juniper M160 debacle [1] one of the comments from the hardware guys was that the market enforced operational requirement that high speed gear use per flow ECMP (vs per packet ECMP) roughly doubles the cost of all modern high speed routing hardware, due to of the complexity of the hashing and extra "routing" step within the chassis to pin each flow to a single routing engine. (All modern high end routers/switches shard the route processing across multiple processors/chips, but either use an extra hash and routing stage up front or a post processing resequencing stage to preserve packet order). There is a 3 way trade off between reordering tolerance, avoiding spurious retransmissions and fast loss recovery. Today TCP implementations have limited reordering tolerance and as a consequence limited ability to balance the other two. RACK makes TCP vastly more tolerant of reordering. It also means that we have an opportunity to explicitly choose the balance between avoiding spurious retransmissions and fast loss recovery. Even if RACK can avoid spurious retransmissions for segments that are a full SRTT late, that is probably not optimal. The balance between the cost of spurious retransmissions and cost of longer recovery times is a separate engineering optimization problem, that is at the heart of your Vicious vs Virtuous circle question. My answer (and the text I volunteered to contribute) is that this is a distinct engineering problem that is sure to change over time and is out of scope for the RACK algorithm document. For one thing this is actually a very complicated global Internet optimization problem. I predict that in the long time horizon it is far cheaper to fix reordering in the end system than the switching fabric (data rates are lower, no cache thrashing from interleaved irrelevant flows, etc), but the transition has to be gradual because in the short term reordering will badly break some end-systems (as Juniper found out). The RACK document should suggest an interim bound on reordering tolerance (SHOULD) and outline some of the tradeoffs on that bound but make it explicit that this bound needs to evolve over time. BTW The Internet would be a whole lot better off if it was ok to do packet level ECPM "within the chassis" and for "channel bonded interfaces". I believe that a 1 ms reordering window would enable this level of reordering and make a huge difference to the Internet as a whole. Let me say that more explicitly: making end-systems tolerate packets 1 ms out of order, (would/should) permit us to disable and eventually remove all of the hardware to support per flow ECMP pinning, and probably save us more than $1B... [1] https://en.wikipedia.org/wiki/Juniper_M_Series#M160 Thanks, --MM-- The best way to predict the future is to create it. - Alan Kay We must not tolerate intolerance; however our response must be carefully measured: too strong would be hypocritical and risks spiraling out of control; too weak risks being mistaken for tacit approval. On Wed, Mar 28, 2018 at 4:09 PM Bob Briscoe wrote: > Yuchung, > > On 21/03/18 11:31, Yuchung Cheng wrote: > > I think different applications will have different answers - but I suspect > we could make a guess in TCP and not need a socket option. > > However, it's important not to punt difficult but important questions. > It's not safe for tcpm to let you drive this car, if no-one has a clue where > the brake is. > > RACK reo_wnd max is SRTT --> I am open to discuss alternatives but not > under such offensive tone. > > How is this punting? I merely meant "how TCP should handle reordering" > may be out-of-scope of a specific loss recovery mechanism -- RACK is > not the only one and would not be the last one. > > RACK can not become an RFC w/o consensus no matter what > > I ask the chairs to moderate. > > > > 1) Sorry if the way I wrote this caused offence - none intended. > "...if no-one has a clue" was not aimed just at you, it was aimed at the > whole WG. > > I am saying that we are entering dangerous territory if we know we are > creating a vicious cycle, but we don't know where to stop it. Just guessing > a max limit (1 SRTT) isn't enough. So IMO we should not proceed until > someone can give at least some sort of credible reasoning for the choice of > number (I'm afraid I can't). > > Intuitively, a ceiling of 1 SRTT seems of the right order for a > long-running flow. And starting at RTT/4 seems about right for short flows. > But I haven't studied the tradeoffs enough to give a reasoned argument. I > have a feel for the user trade off here (delay recovering losses vs. > bandwidth efficiency), but I don't know how to factor in Praveen's concerns > about memory and CPU performance as well. > > To be clear, I think RACK is very important, and I want it deployed > quickly. But if we punt on this question, there will never be a point later > at which we are forced to find an answer. In the longer term, the potential > harm could grow to be greater than the benefit of RACK. (Akin to the square > root scaling in TCP that was punted in 1988, even tho it was known to be > unscalable and gradually came back to bite us.) > > > 2) Altho the last line of the pseudocode for step 3 in the draft > implements an upper limit to RACK.reo_wnd, there's nothing in the English > description (Extension 1 under section 5.2) about this limit. I believe it > is important that the draft says: > > - there "MUST" be an upper limit to RACK's adaptation to the network's > reordering degree. > - why this is necessary - to break the potential vicious cycle > - why the particular value of the upper limit (currently 1 SRTT) has > been chosen > > > > > Bob > > -- > ________________________________________________________________ > Bob Briscoe http://bobbriscoe.net/ > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm > --089e08329e90749ff20568859e07 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I believe it is important that the draft says:
  • there "MUST" be an upper limit to RACK's adaptation to th= e network's reordering degree.=C2=A0
  • why this is necessary - to break the potential vicious cy= cle
  • why the particular value of the uppe= r limit (currently 1 SRTT) has been chosen
Yes, how= ever I would amend this s/MUST/SHOULD/ and add text qualifying the SHOULD (= which I volunteered to write).

One of my goals (fo= r years) has been to enable more parallelism in the network by further rela= xing the operational/performance constraint that packets be in order.=C2=A0= =C2=A0In the aftermath of=C2=A0 the Juniper M160 debacle [1] one of the co= mments from the hardware guys was that the market enforced operational requ= irement that high speed gear use per flow ECMP (vs per packet ECMP) roughly= doubles the cost of all modern high speed routing hardware, due to of the = complexity of the hashing and extra "routing" step within the cha= ssis to pin each flow to a single routing engine.=C2=A0 (All modern high en= d routers/switches shard the route processing across multiple processors/ch= ips, but either use an extra hash and routing stage up front or a post proc= essing resequencing stage to preserve packet order).

There is a 3 way trade off between reordering tolerance, avoiding spurio= us retransmissions and fast loss recovery.=C2=A0 =C2=A0Today TCP implementa= tions have limited reordering tolerance and as a consequence limited abilit= y to balance the other two.=C2=A0 =C2=A0RACK=C2=A0 makes TCP vastly more to= lerant of reordering.=C2=A0 =C2=A0It also means that we have an opportunity= to explicitly choose the balance between=C2=A0avoiding= =C2=A0spurious retransmissions and fast loss recovery.=C2=A0 =C2=A0E= ven if RACK can avoid spurious retransmissions for segments that are a full= SRTT late, that is probably not optimal.

The bala= nce between the cost of spurious retransmissions and cost of longer recover= y times is a separate engineering optimization problem, that is at the hear= t of your Vicious vs Virtuous circle question.=C2=A0 =C2=A0My answer (and t= he text I volunteered to contribute) is that this is a distinct=C2=A0 engin= eering problem that is sure to change over time and is out of scope for=C2= =A0 the RACK algorithm document.=C2=A0 =C2=A0For one thing this is actually= a very complicated global Internet optimization problem.=C2=A0 I predict t= hat in the long time horizon it is far cheaper to fix reordering in the end= system than the switching fabric (data rates are lower, no cache thrashing= from interleaved=C2=A0irrelev= ant=C2=A0flows, etc), but the transition has to be gradual because i= n the short term reordering will badly break some end-systems (as Juniper f= ound out).

The RACK document should suggest an int= erim bound on reordering tolerance (SHOULD) and outline some of the tradeof= fs on that bound but make it explicit that this bound needs to evolve over = time.

BTW The Internet would be a whole lot better= off if it was ok to do packet level ECPM=C2=A0&q= uot;within the chassis" and for "channel bonded interfaces".= =C2=A0 I believe that a 1 ms reordering window would enable this level of r= eordering and make a huge difference to the Internet as a whole.=C2=A0 =C2= =A0Let me say that more explicitly: making end-systems tolerate=C2=A0 packe= ts 1 ms out of order, (would/should) permit us to disable and eventually re= move all of the hardware to support per flow ECMP pinning, and probably sav= e us more than $1B...


Thanks,
--MM--
T= he best way to predict the future is to create it. =C2=A0- Alan Kay

= We must not tolerate intolerance;
=C2=A0 =C2=A0 =C2= =A0 =C2=A0however our response must be carefully measured:=C2=A0
= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 too strong would be hypocritical = and risks spiraling out of control;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 too weak risks being mistaken for tacit approval.
=


On Wed, Mar 28, 2018 at 4:09 PM Bob Briscoe <ietf@bobbriscoe.net> wrote:
=
=20 =20 =20
Yuchung,

On 21/03/= 18 11:31, Yuchung Cheng wrote:
I think different applications will have different answers - b=
ut I suspect
we could make a guess in TCP and not need a socket option.

However, it's important not to punt difficult but important questions.
It's not safe for tcpm to let you drive this car, if no-one has a clue =
where
the brake is.

RACK reo_wnd max is SRTT --> I am open to discuss alternative=
s but not
under such offensive tone.

How is this punting? I merely meant "how TCP should handle reordering&=
quot;
may be out-of-scope of a specific loss recovery mechanism -- RACK is
not the only one and would not be the last one.

RACK can not become an RFC w/o consensus no matter what

I ask the chairs to moderate.

1) Sorry if the way I wrote this caused offence - none intended.
"...if no-one has a clue" was not aimed just at you, it was a= imed at the whole WG.

I am saying that we are entering dangerous territory if we know we are creating a vicious cycle, but we don't know where to stop it. Just guessing a max limit (1 SRTT) isn't enough. So IMO we should not proceed until someone can give at least some sort of credible reasoning for the choice of number (I'm afraid I can't).

Intuitively, a ceiling of 1 SRTT seems of the right order for a long-running flow. And starting at RTT/4 seems about right for short flows. But I haven't studied the tradeoffs enough to give a reasone= d argument. I have a feel for the user trade off here (delay recovering losses vs. bandwidth efficiency), but I don't know how t= o factor in Praveen's concerns about memory and CPU performance as well.

To be clear, I think RACK is very important, and I want it deployed quickly. But if we punt on this question, there will never be a point later at which we are forced to find an answer. In the longer term, the potential harm could grow to be greater than the benefit of RACK. (Akin to the square root scaling in TCP that was punted in 1988, even tho it was known to be unscalable and gradually came back to bite us.)


2) Altho the last line of the pseudocode for step 3 in the draft implements an upper limit to RACK.reo_wnd, there's nothing in the English description (Extension 1 under section 5.2) about this limit. I believe it is important that the draft says:
  • there "MUST" be an upper limit to RACK's adaptation= to the network's reordering degree.
  • why this is necessary - to break the potential vicious cycle
  • why the particular value of the upper limit (currently 1 SRTT) has been chosen



Bob

--=20
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/
_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm
--089e08329e90749ff20568859e07-- From nobody Wed Mar 28 23:20:30 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9E1EE124217 for ; Wed, 28 Mar 2018 23:20:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.21 X-Spam-Level: X-Spam-Status: No, score=-4.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id km6JWfJ9cQes for ; Wed, 28 Mar 2018 23:20:27 -0700 (PDT) Received: from mail-out01.uio.no (mail-out01.uio.no [IPv6:2001:700:100:10::50]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C424A1205D3 for ; Wed, 28 Mar 2018 23:20:26 -0700 (PDT) Received: from mail-mx04.uio.no ([129.240.10.25]) by mail-out01.uio.no with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1f1Qv7-0003Ur-Qt; Thu, 29 Mar 2018 08:20:21 +0200 Received: from 93-58-133-64.ip158.fastwebnet.it ([93.58.133.64] helo=[10.0.0.15]) by mail-mx04.uio.no with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) user michawe (Exim 4.90_1) (envelope-from ) id 1f1Qv6-0000uX-Rh; Thu, 29 Mar 2018 08:20:21 +0200 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (1.0) From: Michael Welzl X-Mailer: iPhone Mail (15D100) In-Reply-To: <060259fd-41ba-0cf1-8e35-1b5031d01caa@bobbriscoe.net> Date: Thu, 29 Mar 2018 08:20:09 +0200 Cc: Praveen Balasubramanian , Joe Touch , "tcpm@ietf.org" , "draft-ietf-tcpm-rack@tools.ietf.org" Content-Transfer-Encoding: quoted-printable Message-Id: <33A800AA-B283-48EF-85B2-7D5E0D69F0BA@ifi.uio.no> References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <284E217A-4A12-4EC1-A9C6-52B6FFF67FFD@tessares.net> <5784486C-1DEF-43E1-B2C7-E61DF4C19178@strayalpha.com> <060259fd-41ba-0cf1-8e35-1b5031d01caa@bobbriscoe.net> To: Bob Briscoe X-UiO-SPF-Received: Received-SPF: neutral (mail-mx04.uio.no: 93.58.133.64 is neither permitted nor denied by domain of ifi.uio.no) client-ip=93.58.133.64; envelope-from=michawe@ifi.uio.no; helo=[10.0.0.15]; X-UiO-Spam-info: not spam, SpamAssassin (score=-4.9, required=5.0, autolearn=disabled, AWL=0.072, TVD_RCVD_IP=0.001, UIO_MAIL_IS_INTERNAL=-5, uiobl=NO, uiouri=NO) X-UiO-Scanned: 545AF681127A0438D0C2A3E3CCCAAFB04880D37F Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 06:20:29 -0000 +1 to this really good rwnd idea! cheers michael Sent from my iPhone > On 29 Mar 2018, at 02:06, Bob Briscoe wrote: >=20 > Praveen, >=20 >> On 27/03/18 17:46, Praveen Balasubramanian wrote: >> It has been this way for years. The dup thresh was defined as 3 packets a= long time ago. There is no good answer for what the max threshold should be= in terms of packets or time. RACK draft is proposing RTT worth but we will n= eed a lot more data. There is trade off between CPU and memory usage here an= d many implementations can choose to stick to 3 packets or RTT/4. The proble= m with time domain is that reordering is defined as a function of RTT which i= s variable so you cannot design for any correct limit. If the RTT is seconds= , on a high BDP link this may mean thousands of packets. > If memory is limited, or if there is a processing performance limit due to= the scale of the reordering buffer at the receiver, wouldn't the correct wa= y to control that be with rwnd? >=20 > Then, it occurs to me that RACK is likely to lead to much more buffering a= t the receiver and consequently, the connection more often being limited by r= wnd. >=20 > So, the RACK algo will need to be conditioned on whether the connection is= cwnd-limited or rwnd-limited (I can't find anything about this in the draft= ). >=20 > If the sender is rwnd-limited, I think RACK would need to reduce the reord= ering window, otherwise the cost of avoiding spurious retransmissions would n= ot just be retransmission delay, but potentially a severe limit to throughpu= t merely because of the large reordering window behind any hole in the recei= ve buffer. >=20 >> I think we still need to define a threshold for max packets which is abso= lute. Nothing in RACK precludes having a max reordering threshold in number o= f packets. > I'm not sure I agree. I think the configured max receive buffer gives you t= he control you need over memory usage and over the performance of the reorde= ring process at the receiver. As long as we can work out a good way for rwnd= to influence the sender's reordering window, I think that should be suffici= ent. >=20 >=20 > Bob >=20 >=20 > --=20 > ________________________________________________________________ > Bob Briscoe http://bobbriscoe.net/ >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm From nobody Thu Mar 29 02:05:33 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B8F1212426E for ; Thu, 29 Mar 2018 02:05:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=bobbriscoe.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QKhnD3Ie9jlt for ; Thu, 29 Mar 2018 02:05:25 -0700 (PDT) Received: from server.dnsblock1.com (server.dnsblock1.com [85.13.236.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 30FFB1241F3 for ; Thu, 29 Mar 2018 02:05:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=bobbriscoe.net; s=default; h=Content-Type:In-Reply-To:MIME-Version:Date: Message-ID:From:References:Cc:To:Subject:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=ZJX4DAiywxjpF48zhTBdvwYfzFLVb635QZwXja2EoBI=; b=KNJ3VnmOM4fVIPoZWkdJ1cyzQ zEHntYb2q+u3uuAxotzwAWovlSxe8sSs5YLs5CevNwAcAW7dgmKkGzMag1UnPR1lOzqtK0kBLPIbQ RzOi/C1v7juNiAs2wm6lZDWD7dGaf74zaEVpJ/tlHAlUZhvHhMdXfEnkFVD6mzyL1C0ZJtZrDmvlX 5PObrWPxwnCteamJJ/NTP1pU6d9v1JAC5NfOyChElrvsq0rprPfPmhTlGj4lSeWpvUNwWFv55BxD7 sfuBqXSeHIk4rB3+gzyur55sah2flb6lG9Guv2NMSS4dtapBebIqe6zOtPYl9bO6KbiNEKGJL7EdL x7DRiCBlQ==; Received: from host-79-78-166-168.static.as9105.net ([79.78.166.168]:38500 helo=[192.168.2.6]) by server.dnsblock1.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89_1) (envelope-from ) id 1f1TUm-0000gI-Mv; Thu, 29 Mar 2018 10:05:21 +0100 To: Matt Mathis Cc: Yuchung Cheng , tcpm IETF list , draft-ietf-tcpm-rack@tools.ietf.org References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <1c5bef94-eb4f-7aab-0b6b-cb2d02da7a9a@bobbriscoe.net> <6a451b96-af61-f5c8-87a9-9968e99027de@bobbriscoe.net> From: Bob Briscoe Message-ID: <1b5f83b1-d38c-d18c-b259-9817ae8f226c@bobbriscoe.net> Date: Thu, 29 Mar 2018 10:05:19 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------C2E18453BDF0E175F1779DCC" Content-Language: en-GB X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.dnsblock1.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - bobbriscoe.net X-Get-Message-Sender-Via: server.dnsblock1.com: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: server.dnsblock1.com: in@bobbriscoe.net Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 09:05:32 -0000 This is a multi-part message in MIME format. --------------C2E18453BDF0E175F1779DCC Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Matt, On 29/03/18 05:32, Matt Mathis wrote: > > I believe it is important that the draft says: > > * there "MUST" be an upper limit to RACK's adaptation to the > network's reordering degree. > * why this is necessary - to break the potential vicious cycle > * why the particular value of the upper limit (currently 1 SRTT) > has been chosen > > Yes, however I would amend this s/MUST/SHOULD/ and add text qualifying > the SHOULD (which I volunteered to write). > > One of my goals (for years) has been to enable more parallelism in the > network by further relaxing the operational/performance constraint > that packets be in order.   In the aftermath of  the Juniper M160 > debacle [1] one of the comments from the hardware guys was that the > market enforced operational requirement that high speed gear use per > flow ECMP (vs per packet ECMP) roughly doubles the cost of all modern > high speed routing hardware, due to of the complexity of the hashing > and extra "routing" step within the chassis to pin each flow to a > single routing engine.  (All modern high end routers/switches shard > the route processing across multiple processors/chips, but either use > an extra hash and routing stage up front or a post processing > resequencing stage to preserve packet order). > > There is a 3 way trade off between reordering tolerance, avoiding > spurious retransmissions and fast loss recovery.   Today TCP > implementations have limited reordering tolerance and as a consequence > limited ability to balance the other two.   RACK makes TCP vastly more > tolerant of reordering.   It also means that we have an opportunity to > explicitly choose the balance between avoiding spurious > retransmissions and fast loss recovery.   Even if RACK can avoid > spurious retransmissions for segments that are a full SRTT late, that > is probably not optimal. It's a 3-way trade off, but reordering tolerance is the independent variable, not one of the three *user-experience* impairments that are the dependent variables: 1. bandwidth inefficiency 2. loss recovery delay 3. delivery delay (without loss) Each of these depends on reordering tolerance as follows: 1. bandwidth inefficiency depends on spurious retransmissions, which *reduce* as reordering tolerance increases 2. loss recovery delay *increases* as reordering tolerance increases {Note 1} 3. delivery delay *reduces* as reordering tolerance increases {Note 2} That's a trade off that the sender can do on behalf of the end-user. It's challenging, cos the three metrics are in different units (bandwidth & delay), so it depends on the user's utility for each. But at least it's not politically challenging - the end-user buys and controls the sending host, which is in control of the trade off. However, as I said in a previous posting, this doesn't address the *cost* trade off in processing and memory terms: 1. increasing reordering tolerance increases *receiver* memory & processing costs 2. reducing reordering tolerance increases *network* memory and processing costs (consequently capping network throughput) That's a politically challenging trade off: it's a tussle between vendors of receivers (typically bought by consumers) and vendors of network gear (bought by network operators). {Note 1}: There are other ways to remove losses, e.g. FEC, ECN. In an ideal world, if they were 100% successfully employed, there would be no trade off - increasing reordering tolerance would be wholly beneficial. {Note 2}: Shifting reordering to the end-system reduces head-of-line blocking of one stream when another has suffered a loss because it's the receiver's job to demultiplex between microflows, which naturally removes intra-flow HoL blocking. Also, if there are streams within an encrypted microflow (e.g. http2, quic), only the receiver can demultiplex the streams to resolve any HoL blocking. > > The balance between the cost of spurious retransmissions and cost of > longer recovery times is a separate engineering optimization problem, > that is at the heart of your Vicious vs Virtuous circle question.   My > answer (and the text I volunteered to contribute) is that this is a > distinct  engineering problem that is sure to change over time and is > out of scope for  the RACK algorithm document.   For one thing this is > actually a very complicated global Internet optimization problem.  I > predict that in the long time horizon it is far cheaper to fix > reordering in the end system than the switching fabric (data rates are > lower, no cache thrashing from interleaved irrelevant flows, etc), but > the transition has to be gradual because in the short term reordering > will badly break some end-systems (as Juniper found out). I agree with this para... > > The RACK document should suggest an interim bound on reordering > tolerance (SHOULD) and outline some of the tradeoffs on that bound but > make it explicit that this bound needs to evolve over time. ...but I think the way to write this is: "a RACK implementation MUST implement an explicit bound", and "it SHOULD be set to value X". If you want to only say "SHOULD implement an explicit bound", you have to be able to give a scenario where it make sense not to have a bound at all. Admittedly, this still allows an implementer to set a stupidly high bound, which is no better than not having one. But it allows the doc to explain why an explicit bound is essential (which will not be obvious to all implementers, unless they understand the bigger picture). Cheers Bob > > BTW The Internet would be a whole lot better off if it was ok to do > packet level ECPM "within the chassis" and for "channel bonded > interfaces".  I believe that a 1 ms reordering window would enable > this level of reordering and make a huge difference to the Internet as > a whole.   Let me say that more explicitly: making end-systems > tolerate  packets 1 ms out of order, (would/should) permit us to > disable and eventually remove all of the hardware to support per flow > ECMP pinning, and probably save us more than $1B... > > [1] https://en.wikipedia.org/wiki/Juniper_M_Series#M160 > > Thanks, > --MM-- > The best way to predict the future is to create it.  - Alan Kay > > We must not tolerate intolerance; >        however our response must be carefully measured: >             too strong would be hypocritical and risks spiraling out > of control; >             too weak risks being mistaken for tacit approval. > > > On Wed, Mar 28, 2018 at 4:09 PM Bob Briscoe > wrote: > > Yuchung, > > On 21/03/18 11:31, Yuchung Cheng wrote: >>> I think different applications will have different answers - but I suspect >>> we could make a guess in TCP and not need a socket option. >>> >>> However, it's important not to punt difficult but important questions. >>> It's not safe for tcpm to let you drive this car, if no-one has a clue where >>> the brake is. >> RACK reo_wnd max is SRTT --> I am open to discuss alternatives but not >> under such offensive tone. >> >> How is this punting? I merely meant "how TCP should handle reordering" >> may be out-of-scope of a specific loss recovery mechanism -- RACK is >> not the only one and would not be the last one. >> >> RACK can not become an RFC w/o consensus no matter what >> >> I ask the chairs to moderate. >> > > 1) Sorry if the way I wrote this caused offence - none intended. > "...if no-one has a clue" was not aimed just at you, it was aimed > at the whole WG. > > I am saying that we are entering dangerous territory if we know we > are creating a vicious cycle, but we don't know where to stop it. > Just guessing a max limit (1 SRTT) isn't enough. So IMO we should > not proceed until someone can give at least some sort of credible > reasoning for the choice of number (I'm afraid I can't). > > Intuitively, a ceiling of 1 SRTT seems of the right order for a > long-running flow. And starting at RTT/4 seems about right for > short flows. But I haven't studied the tradeoffs enough to give a > reasoned argument. I have a feel for the user trade off here > (delay recovering losses vs. bandwidth efficiency), but I don't > know how to factor in Praveen's concerns about memory and CPU > performance as well. > > To be clear, I think RACK is very important, and I want it > deployed quickly. But if we punt on this question, there will > never be a point later at which we are forced to find an answer. > In the longer term, the potential harm could grow to be greater > than the benefit of RACK. (Akin to the square root scaling in TCP > that was punted in 1988, even tho it was known to be unscalable > and gradually came back to bite us.) > > > 2) Altho the last line of the pseudocode for step 3 in the draft > implements an upper limit to RACK.reo_wnd, there's nothing in the > English description (Extension 1 under section 5.2) about this > limit. I believe it is important that the draft says: > > * there "MUST" be an upper limit to RACK's adaptation to the > network's reordering degree. > * why this is necessary - to break the potential vicious cycle > * why the particular value of the upper limit (currently 1 SRTT) > has been chosen > > > > > Bob > > -- > ________________________________________________________________ > Bob Briscoehttp://bobbriscoe.net/ > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm > -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/ --------------C2E18453BDF0E175F1779DCC Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit Matt,

On 29/03/18 05:32, Matt Mathis wrote:
I believe it is important that the draft says:
  • there "MUST" be an upper limit to RACK's adaptation to the network's reordering degree. 
  • why this is necessary - to break the potential vicious cycle
  • why the particular value of the upper limit (currently 1 SRTT) has been chosen
Yes, however I would amend this s/MUST/SHOULD/ and add text qualifying the SHOULD (which I volunteered to write).

One of my goals (for years) has been to enable more parallelism in the network by further relaxing the operational/performance constraint that packets be in order.   In the aftermath of  the Juniper M160 debacle [1] one of the comments from the hardware guys was that the market enforced operational requirement that high speed gear use per flow ECMP (vs per packet ECMP) roughly doubles the cost of all modern high speed routing hardware, due to of the complexity of the hashing and extra "routing" step within the chassis to pin each flow to a single routing engine.  (All modern high end routers/switches shard the route processing across multiple processors/chips, but either use an extra hash and routing stage up front or a post processing resequencing stage to preserve packet order).

There is a 3 way trade off between reordering tolerance, avoiding spurious retransmissions and fast loss recovery.   Today TCP implementations have limited reordering tolerance and as a consequence limited ability to balance the other two.   RACK  makes TCP vastly more tolerant of reordering.   It also means that we have an opportunity to explicitly choose the balance between avoiding spurious retransmissions and fast loss recovery.   Even if RACK can avoid spurious retransmissions for segments that are a full SRTT late, that is probably not optimal.
It's a 3-way trade off, but reordering tolerance is the independent variable, not one of the three user-experience impairments that are the dependent variables:
  1. bandwidth inefficiency
  2. loss recovery delay
  3. delivery delay (without loss)
Each of these depends on reordering tolerance as follows:
  1. bandwidth inefficiency depends on spurious retransmissions, which reduce as reordering tolerance increases
  2. loss recovery delay increases as reordering tolerance increases {Note 1}
  3. delivery delay reduces as reordering tolerance increases {Note 2}
That's a trade off that the sender can do on behalf of the end-user. It's challenging, cos the three metrics are in different units (bandwidth & delay), so it depends on the user's utility for each. But at least it's not politically challenging - the end-user buys and controls the sending host, which is in control of the trade off.

However, as I said in a previous posting, this doesn't address the cost trade off in processing and memory terms:
  1. increasing reordering tolerance increases receiver memory & processing costs
  2. reducing reordering tolerance increases network memory and processing costs (consequently capping network throughput)
That's a politically challenging trade off: it's a tussle between vendors of receivers (typically bought by consumers) and vendors of network gear (bought by network operators).

{Note 1}: There are other ways to remove losses, e.g. FEC, ECN. In an ideal world, if they were 100% successfully employed, there would be no trade off - increasing reordering tolerance would be wholly beneficial.

{Note 2}: Shifting reordering to the end-system reduces head-of-line blocking of one stream when another has suffered a loss because it's the receiver's job to demultiplex between microflows, which naturally removes intra-flow HoL blocking. Also, if there are streams within an encrypted microflow (e.g. http2, quic), only the receiver can demultiplex the streams to resolve any HoL blocking.



The balance between the cost of spurious retransmissions and cost of longer recovery times is a separate engineering optimization problem, that is at the heart of your Vicious vs Virtuous circle question.   My answer (and the text I volunteered to contribute) is that this is a distinct  engineering problem that is sure to change over time and is out of scope for  the RACK algorithm document.   For one thing this is actually a very complicated global Internet optimization problem.  I predict that in the long time horizon it is far cheaper to fix reordering in the end system than the switching fabric (data rates are lower, no cache thrashing from interleaved irrelevant flows, etc), but the transition has to be gradual because in the short term reordering will badly break some end-systems (as Juniper found out).
I agree with this para...

The RACK document should suggest an interim bound on reordering tolerance (SHOULD) and outline some of the tradeoffs on that bound but make it explicit that this bound needs to evolve over time.
...but I think the way to write this is: "a RACK implementation MUST implement an explicit bound", and "it SHOULD be set to value X".

If you want to only say "SHOULD implement an explicit bound", you have to be able to give a scenario where it make sense not to have a bound at all.

Admittedly, this still allows an implementer to set a stupidly high bound, which is no better than not having one. But it allows the doc to explain why an explicit bound is essential (which will not be obvious to all implementers, unless they understand the bigger picture).

Cheers



Bob


BTW The Internet would be a whole lot better off if it was ok to do packet level ECPM "within the chassis" and for "channel bonded interfaces".  I believe that a 1 ms reordering window would enable this level of reordering and make a huge difference to the Internet as a whole.   Let me say that more explicitly: making end-systems tolerate  packets 1 ms out of order, (would/should) permit us to disable and eventually remove all of the hardware to support per flow ECMP pinning, and probably save us more than $1B...


Thanks,
--MM--
The best way to predict the future is to create it.  - Alan Kay

We must not tolerate intolerance;
       however our response must be carefully measured: 
            too strong would be hypocritical and risks spiraling out of control;
            too weak risks being mistaken for tacit approval.


On Wed, Mar 28, 2018 at 4:09 PM Bob Briscoe <ietf@bobbriscoe.net> wrote:
Yuchung,

On 21/03/18 11:31, Yuchung Cheng wrote:
I think different applications will have different answers - but I suspect
we could make a guess in TCP and not need a socket option.

However, it's important not to punt difficult but important questions.
It's not safe for tcpm to let you drive this car, if no-one has a clue where
the brake is.

RACK reo_wnd max is SRTT --> I am open to discuss alternatives but not
under such offensive tone.

How is this punting? I merely meant "how TCP should handle reordering"
may be out-of-scope of a specific loss recovery mechanism -- RACK is
not the only one and would not be the last one.

RACK can not become an RFC w/o consensus no matter what

I ask the chairs to moderate.

1) Sorry if the way I wrote this caused offence - none intended.
"...if no-one has a clue" was not aimed just at you, it was aimed at the whole WG.

I am saying that we are entering dangerous territory if we know we are creating a vicious cycle, but we don't know where to stop it. Just guessing a max limit (1 SRTT) isn't enough. So IMO we should not proceed until someone can give at least some sort of credible reasoning for the choice of number (I'm afraid I can't).

Intuitively, a ceiling of 1 SRTT seems of the right order for a long-running flow. And starting at RTT/4 seems about right for short flows. But I haven't studied the tradeoffs enough to give a reasoned argument. I have a feel for the user trade off here (delay recovering losses vs. bandwidth efficiency), but I don't know how to factor in Praveen's concerns about memory and CPU performance as well.

To be clear, I think RACK is very important, and I want it deployed quickly. But if we punt on this question, there will never be a point later at which we are forced to find an answer. In the longer term, the potential harm could grow to be greater than the benefit of RACK. (Akin to the square root scaling in TCP that was punted in 1988, even tho it was known to be unscalable and gradually came back to bite us.)


2) Altho the last line of the pseudocode for step 3 in the draft implements an upper limit to RACK.reo_wnd, there's nothing in the English description (Extension 1 under section 5.2) about this limit. I believe it is important that the draft says:
  • there "MUST" be an upper limit to RACK's adaptation to the network's reordering degree.
  • why this is necessary - to break the potential vicious cycle
  • why the particular value of the upper limit (currently 1 SRTT) has been chosen



Bob

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Bob Briscoe                               http://bobbriscoe.net/
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________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/
--------------C2E18453BDF0E175F1779DCC-- From nobody Thu Mar 29 02:45:11 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E666212D87C for ; Thu, 29 Mar 2018 02:45:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ebyge4A9b-gK for ; Thu, 29 Mar 2018 02:45:07 -0700 (PDT) Received: from mail-oi0-x232.google.com (mail-oi0-x232.google.com [IPv6:2607:f8b0:4003:c06::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E14F01200A0 for ; Thu, 29 Mar 2018 02:45:06 -0700 (PDT) Received: by mail-oi0-x232.google.com with SMTP id t16-v6so4648466oih.3 for ; Thu, 29 Mar 2018 02:45:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=0hqgyhEui3xmqCTz4QK55iwTI7qxlUQJYRW6ss/E9e4=; b=tpSqzsGhJ5FUBS2pSXulB7ukxGM3kP+WNwbsX0PSWHKWn84ppwe70ZqvetCf2Mn6NC pMR5JG8RlvaJMPh87SJmEMnRkvjliJdXngQ32nuxd04uXD9CIq5iagGHWmlf66pt2YCM b6d7ikMIM5utM+LWb9YCavMzIBPAr1EkSwOL5f74VJSNWxIDDkv51JFqu1mtJv4l/HjH MtZWuxbg5NaZodI1L2+FBEAyTiysnkz1dkldMNqAzP6WNF8d5OrHK7m3BIY8jzXsT4kH I3SkRhA9vbTkkdeYKsn0ZtTkY7YAlglz9Gz9DbkgWAGxwPyMTtMGkVYHBu4Nu9RFRsqW s0DA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=0hqgyhEui3xmqCTz4QK55iwTI7qxlUQJYRW6ss/E9e4=; b=gu+rhDc03qDJRd45tQLG9z1kvJPLgg/n1mlHYtUxgO2bqkviwFCs/RYgxjXtN71P4F Ev5oZn650jNu+e/yXj1UueSNY+n8kGTfEj3eBi/5Nsqnpzi+pR0NVkcFsYkGOTciSxOr aOXtASTPLavzWow7ZU6b5zRpopHhzHY0DOmcOVFIyx19ewcyfwAUsiDuz8XvTOIfMY8X 980m4hv6BPuM8iRRjf217WStirHs0PkH2/2mXXeYNxTY1Wt62TcFFQtz6/8oSgYUPf9B R+fEuiYp21bKe3VxNJPysACZHbjK0FLwokOz4LfOOmmwyxe6Hf5lYlsyh+yfIejgx8Ef 0gLg== X-Gm-Message-State: ALQs6tAL4XfbodvLUgxzLPUrkWIJj+lrAvnFTU4bjxw8AuEIqqHDrRP/ jYroQDQ0ljnb5VRwPYUSm5oxfu8U5LU6c2Tq2rEMrLtZ X-Google-Smtp-Source: AIpwx4+wHiIZ7z/d1M+IRJpZZ26M5L67fsOEsjSLbwbm9XOHpnPgkLTgGDWh2VkTZOF5xama25buF5rgLLnsKHg9UsQ= X-Received: by 10.202.102.7 with SMTP id a7mr4028476oic.73.1522316706150; Thu, 29 Mar 2018 02:45:06 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a9d:186b:0:0:0:0:0 with HTTP; Thu, 29 Mar 2018 02:45:05 -0700 (PDT) In-Reply-To: References: From: "Maxim Proshin [GMAIL]" Date: Thu, 29 Mar 2018 12:45:05 +0300 Message-ID: To: Mikael Abrahamsson Cc: William Herrin , tcpm@ietf.org Content-Type: multipart/alternative; boundary="001a11409814817c3b056889fada" Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 09:45:09 -0000 --001a11409814817c3b056889fada Content-Type: text/plain; charset="UTF-8" Hi, What is a status of classical PMTUD in Linux TCP? Is it enabled by default? I guess it's enabled by default but TCP implementation actually relies on IP for that. BR, Maxim On Wed, Mar 28, 2018 at 6:51 PM, Mikael Abrahamsson wrote: > On Wed, 28 Mar 2018, William Herrin wrote: > > Sacrilege to suggest sending anything without the DF bit set, but if the >> router's return has a black hole, maybe the answer is to let the router >> communicate forward instead. >> > > 1. IPv6 doesn't have a DF bit that can be on or off, it's always > implicitly on. > 2. Fragmentation doesn't usually happen if there is PMTUD blackhole. > > So I have no idea how to come to a best conclusion regarding the tradeoff > between "doesn't work at all" and "doesn't work optimally in some cases". > Generally, I'd be happy with a blackhole detect that falls back to low MTU > (576 for IPv4, 1280 for IPv6) whenever there seems to be a real blackhole, > and be very cautious in going back up again in MSS. > > Right now I would like things to be more resilient to complete failure > than what TCP is today without blackhole detect. > > -- > Mikael Abrahamsson email: swmike@swm.pp.se > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm > -- BR, Maxim --001a11409814817c3b056889fada Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi,

What is a status of=20 classical PMTUD=C2=A0in Linux TCP? Is it e= nabled by default?=C2=A0
I guess it's enabled by default but = TCP implementation actually relies on IP for that.

BR, Maxim

On Wed, Mar 28, 2018 at 6:51 PM, Mikael Abrahamsson = <swmike@swm.pp.se<= /a>> wrote:
On= Wed, 28 Mar 2018, William Herrin wrote:

Sacrilege to suggest sending anything without the DF bit set, but if the ro= uter's return has a black hole, maybe the answer is to let the router c= ommunicate forward instead.

 1. IPv6 doesn't have a DF bit that can be on or off, it's always im= plicitly on.
2. Fragmentation doesn't usually happen if there is PMTUD blackhole.
So I have no idea how to come to a best conclusion regarding the tradeoff b= etween "doesn't work at all" and "doesn't work optim= ally in some cases". Generally, I'd be happy with a blackhole dete= ct that falls back to low MTU (576 for IPv4, 1280 for IPv6) whenever there = seems to be a real blackhole, and be very cautious in going back up again i= n MSS.

Right now I would like things to be more resilient to complete failure than= what TCP is today without blackhole detect.

--
Mikael Abrahamsson=C2=A0 =C2=A0 email: swmike@swm.pp.se

_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm



--
=
BR, Maxim=
--001a11409814817c3b056889fada-- From nobody Thu Mar 29 04:42:37 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5303C12DA06 for ; Thu, 29 Mar 2018 04:42:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.209 X-Spam-Level: X-Spam-Status: No, score=-4.209 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id j_zgM50HMUck for ; Thu, 29 Mar 2018 04:42:33 -0700 (PDT) Received: from mail-out01.uio.no (mail-out01.uio.no [IPv6:2001:700:100:10::50]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 51F241200B9 for ; Thu, 29 Mar 2018 04:42:32 -0700 (PDT) Received: from mail-mx06.uio.no ([129.240.10.40]) by mail-out01.uio.no with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1f1Vwq-0004Xn-PY; Thu, 29 Mar 2018 13:42:28 +0200 Received: from 93-58-133-64.ip158.fastwebnet.it ([93.58.133.64] helo=[10.0.0.10]) by mail-mx06.uio.no with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) user michawe (Exim 4.90_1) (envelope-from ) id 1f1Vwo-0003pq-Uh; Thu, 29 Mar 2018 13:42:28 +0200 From: Michael Welzl Message-Id: <1D6E4D94-643D-497F-87E5-D4F8C72EA639@ifi.uio.no> Content-Type: multipart/alternative; boundary="Apple-Mail=_E067DFE2-8CA6-48A0-B157-F7F374DB419D" Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Date: Thu, 29 Mar 2018 13:42:20 +0200 In-Reply-To: <1b5f83b1-d38c-d18c-b259-9817ae8f226c@bobbriscoe.net> Cc: Matt Mathis , tcpm IETF list , draft-ietf-tcpm-rack@tools.ietf.org To: Bob Briscoe References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <1c5bef94-eb4f-7aab-0b6b-cb2d02da7a9a@bobbriscoe.net> <6a451b96-af61-f5c8-87a9-9968e99027de@bobbriscoe.net> <1b5f83b1-d38c-d18c-b259-9817ae8f226c@bobbriscoe.net> X-Mailer: Apple Mail (2.3273) X-UiO-SPF-Received: Received-SPF: neutral (mail-mx06.uio.no: 93.58.133.64 is neither permitted nor denied by domain of ifi.uio.no) client-ip=93.58.133.64; envelope-from=michawe@ifi.uio.no; helo=[10.0.0.10]; X-UiO-Spam-info: not spam, SpamAssassin (score=-5.0, required=5.0, autolearn=disabled, HTML_MESSAGE=0.001, TVD_RCVD_IP=0.001, UIO_MAIL_IS_INTERNAL=-5, uiobl=NO, uiouri=NO) X-UiO-Scanned: DA0ED0246E711EB01D004911444BC3616F441AF1 Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 11:42:36 -0000 --Apple-Mail=_E067DFE2-8CA6-48A0-B157-F7F374DB419D Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi all, I was just about to propose a socket option for the upper limit on = reordering (e.g. as a function of the RTT) - to convey whether an = application is latency-critical or not. However, some of what Bob wrote = below throws me off=E2=80=A6 I keep only the relevant bits and = reordering them slightly for better context: > On Mar 29, 2018, at 11:05 AM, Bob Briscoe wrote: >=20 > Matt, > bandwidth inefficiency depends on spurious retransmissions, which = reduce as reordering tolerance increases > loss recovery delay increases as reordering tolerance increases {Note = 1} > delivery delay reduces as reordering tolerance increases {Note 2} [snip] >=20 > {Note 1}: There are other ways to remove losses, e.g. FEC, ECN. In an = ideal world, if they were 100% successfully employed, there would be no = trade off - increasing reordering tolerance would be wholly beneficial. The second sentence here confuses me: undoubtedly, for an application = that needs to get stuff in order, reordering can cause delay = (considering only one connection). That is, if it is produced e.g. by = in-network load balancing that sends some data over a longer-latency = path, that delay affects everything. E.g. ECN can=E2=80=99t help that?! > {Note 2}: Shifting reordering to the end-system reduces head-of-line = blocking of one stream when another has suffered a loss because it's the = receiver's job to demultiplex between microflows, which naturally = removes intra-flow HoL blocking. Also, if there are streams within an = encrypted microflow (e.g. http2, quic), only the receiver can = demultiplex the streams to resolve any HoL blocking. But we=E2=80=99re talking about TCP here, and generally I find this = paragraph hard to parse. You seem to have a multi-flow scenario in mind = that isn=E2=80=99t fully described. To begin with, without Minion=E2=80=99= ish trickery, a single TCP connection can only deliver data that arrives = in order up to the application, and hence reordering (when some data = arrive later, not earlier, because they use a longer-latency path) can = cause delay for that application. A separate thing: > However, as I said in a previous posting, this doesn't address the = cost trade off in processing and memory terms: > increasing reordering tolerance increases receiver memory & processing = costs > reducing reordering tolerance increases network memory and processing = costs (consequently capping network throughput) About 1, isn=E2=80=99t this perhaps solved by your rwnd idea (your email = to Praveen)? If it is, then the answer to 2 is: fine, we can increase reordering = tolerance anyway. Generally, I agree with the pro-reordering musings in this thread, e.g. = from Matt - we have a silly situation in the network today, where TCP = acts as if it was a connection oriented network and in-network devices = jump through various hoops to maintain this illusion. In fact, the = Internet is a packet oriented network, and if we can tweak things a = little in a direction that allows people to tune the network in a more = packet oriented fashion (instead of TCP-connection-oriented), then = that=E2=80=99s a good thing. Looking at the draft, RACK asks for Experimental status. Couldn=E2=80=99t = we see "finding out how much reordering is acceptable=E2=80=9D as part = of the experiment? I mean, some version of RACK is in Linux already, = and things haven=E2=80=99t broken badly as far as I know. This = experiment would at least let us uncover how severe the processing / = memory costs above really are. Cheers, ichMael (Michael, reordered) --Apple-Mail=_E067DFE2-8CA6-48A0-B157-F7F374DB419D Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
Hi all,

I was just about to propose a socket = option for the upper limit on reordering (e.g. as a function of the RTT) = - to convey whether an application is latency-critical or not. However, = some of what Bob wrote below throws me off=E2=80=A6 I keep only the = relevant bits and reordering them slightly for better context:


On = Mar 29, 2018, at 11:05 AM, Bob Briscoe <ietf@bobbriscoe.net>= wrote:

=20 =20
Matt,
  1. bandwidth = inefficiency depends on spurious retransmissions, which reduce as reordering tolerance = increases
  2. loss recovery delay increases as = reordering tolerance increases {Note 1}
  3. delivery delay reduces as = reordering tolerance increases {Note = 2}
[snip]

{Note 1}: There are other ways to remove losses, e.g. FEC, ECN. In an ideal world, if they were 100% successfully employed, there would be no trade off - increasing reordering tolerance would be wholly beneficial.

The second sentence here confuses me: undoubtedly, = for an application that needs to get stuff in order, reordering can = cause delay (considering only one connection). That is, if it is = produced e.g. by in-network load balancing that sends some data over a = longer-latency path, that delay affects everything. E.g. ECN can=E2=80=99t= help that?!


=20 {Note 2}: Shifting reordering to the end-system reduces head-of-line blocking of one stream when another has suffered a loss because it's the receiver's job to demultiplex between microflows, which naturally removes intra-flow HoL blocking. Also, if there are streams within an encrypted microflow (e.g. http2, quic), only the receiver can demultiplex the streams to resolve any HoL blocking.

But = we=E2=80=99re talking about TCP here, and generally I find this = paragraph hard to parse. You seem to have a multi-flow scenario in mind = that isn=E2=80=99t fully described. To begin with, without Minion=E2=80=99= ish trickery, a single TCP connection can only deliver data that arrives = in order up to the application, and hence reordering (when some data = arrive later, not earlier, because they use a longer-latency path) can = cause delay for that application.


A separate thing:

However, as I said in a = previous posting, this doesn't address the cost trade off in processing and memory terms:
  1. increasing reordering tolerance = increases receiver memory & processing = costs
  2. reducing reordering tolerance increases network memory and processing costs (consequently = capping network throughput)
About 1, isn=E2=80=99t this = perhaps solved by your rwnd idea (your email to Praveen)?
If = it is, then the answer to 2 is: fine, we can increase reordering = tolerance anyway.

Generally, I agree = with the pro-reordering musings in this thread, e.g. from Matt - we have = a silly situation in the network today, where TCP acts as if it was a = connection oriented network and in-network devices jump through various = hoops to maintain this illusion. In fact, the Internet is a packet = oriented network, and if we can tweak things a little in a direction = that allows people to tune the network in a more packet oriented fashion = (instead of TCP-connection-oriented), then that=E2=80=99s a good = thing.

Looking at the draft, RACK = asks for Experimental status. Couldn=E2=80=99t we see "finding out how = much reordering is acceptable=E2=80=9D as part of the experiment? =  I mean, some version of RACK is in Linux already, and things = haven=E2=80=99t broken badly as far as I know.  This experiment = would at least let us uncover how severe the processing / memory costs = above really are.

Cheers,
ichMael   (Michael, = reordered)

= --Apple-Mail=_E067DFE2-8CA6-48A0-B157-F7F374DB419D-- From nobody Thu Mar 29 04:42:45 2018 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 76C7212DA21; Thu, 29 Mar 2018 04:42:38 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: tcpm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.76.1 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <152232375838.24095.11476530489406802749@ietfa.amsl.com> Date: Thu, 29 Mar 2018 04:42:38 -0700 Archived-At: Subject: [tcpm] I-D Action: draft-ietf-tcpm-rfc793bis-09.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 11:42:40 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF. Title : Transmission Control Protocol Specification Author : Wesley M. Eddy Filename : draft-ietf-tcpm-rfc793bis-09.txt Pages : 102 Date : 2018-03-29 Abstract: This document specifies the Internet's Transmission Control Protocol (TCP). TCP is an important transport layer protocol in the Internet stack, and has continuously evolved over decades of use and growth of the Internet. Over this time, a number of changes have been made to TCP as it was specified in RFC 793, though these have only been documented in a piecemeal fashion. This document collects and brings those changes together with the protocol specification from RFC 793. This document obsoletes RFC 793, as well as 879, 2873, 6093, 6429, 6528, and 6691 that updated parts of RFC 793. It updates RFC 1122, and should be considered as a replacement for the portions of that document dealing with TCP requirements. It updates RFC 5961 due to a small clarification in reset handling while in the SYN-RECEIVED state. RFC EDITOR NOTE: If approved for publication as an RFC, this should be marked additionally as "STD: 7" and replace RFC 793 in that role. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc793bis/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-tcpm-rfc793bis-09 https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-rfc793bis-09 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rfc793bis-09 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Thu Mar 29 04:45:02 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 29D3312DA07 for ; Thu, 29 Mar 2018 04:45:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.21 X-Spam-Level: X-Spam-Status: No, score=-4.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LdlMPXRE13oT for ; Thu, 29 Mar 2018 04:45:00 -0700 (PDT) Received: from mail-out01.uio.no (mail-out01.uio.no [IPv6:2001:700:100:10::50]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DE0F71200B9 for ; Thu, 29 Mar 2018 04:44:59 -0700 (PDT) Received: from mail-mx02.uio.no ([129.240.10.43]) by mail-out01.uio.no with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1f1VzG-0004fx-7i; Thu, 29 Mar 2018 13:44:58 +0200 Received: from 93-58-133-64.ip158.fastwebnet.it ([93.58.133.64] helo=[10.0.0.10]) by mail-mx02.uio.no with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) user michawe (Exim 4.90_1) (envelope-from ) id 1f1VzF-000EuX-1x; Thu, 29 Mar 2018 13:44:58 +0200 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) From: Michael Welzl In-Reply-To: <1D6E4D94-643D-497F-87E5-D4F8C72EA639@ifi.uio.no> Date: Thu, 29 Mar 2018 13:44:56 +0200 Cc: tcpm IETF list , Matt Mathis , draft-ietf-tcpm-rack@tools.ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: <981805D3-4F0F-4C99-93D3-C650D640EA9A@ifi.uio.no> References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <1c5bef94-eb4f-7aab-0b6b-cb2d02da7a9a@bobbriscoe.net> <6a451b96-af61-f5c8-87a9-9968e99027de@bobbriscoe.net> <1b5f83b1-d38c-d18c-b259-9817ae8f226c@bobbriscoe.net> <1D6E4D94-643D-497F-87E5-D4F8C72EA639@ifi.uio.no> To: Bob Briscoe X-Mailer: Apple Mail (2.3273) X-UiO-SPF-Received: Received-SPF: neutral (mail-mx02.uio.no: 93.58.133.64 is neither permitted nor denied by domain of ifi.uio.no) client-ip=93.58.133.64; envelope-from=michawe@ifi.uio.no; helo=[10.0.0.10]; X-UiO-Spam-info: not spam, SpamAssassin (score=-4.9, required=5.0, autolearn=disabled, AWL=0.082, TVD_RCVD_IP=0.001, UIO_MAIL_IS_INTERNAL=-5, uiobl=NO, uiouri=NO) X-UiO-Scanned: B0150447CB4D3792779DA03DE931664DAA590D8C Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 11:45:01 -0000 > On Mar 29, 2018, at 1:42 PM, Michael Welzl wrote: >=20 > Hi all, >=20 > I was just about to propose a socket option for the upper limit on = reordering (e.g. as a function of the RTT) - to convey whether an = application is latency-critical or not. However, some of what Bob wrote = below throws me off=E2=80=A6 I keep only the relevant bits and = reordering them slightly for better context: First, that was a typo - should be =E2=80=9Creorder=E2=80=9D. Second, I = almost missed the irony of this=E2=80=A6 making things *more* = understandable by reordering... Cheers, Michael From nobody Thu Mar 29 06:10:18 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 515FA126E64 for ; Thu, 29 Mar 2018 06:10:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.31 X-Spam-Level: X-Spam-Status: No, score=-4.31 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=swm.pp.se Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SIpK4AyJX_S1 for ; Thu, 29 Mar 2018 06:10:14 -0700 (PDT) Received: from uplift.swm.pp.se (ipv6.swm.pp.se [IPv6:2a00:801::f]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AF4A412D951 for ; Thu, 29 Mar 2018 06:10:11 -0700 (PDT) Received: by uplift.swm.pp.se (Postfix, from userid 501) id 02B6CAF; Thu, 29 Mar 2018 15:10:09 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=swm.pp.se; s=mail; t=1522329010; bh=RNyVfux9pV1gRvh5LXYpPEoigSuFjGGogvbn0oY7Iok=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=QXwvtpFlekzKjv/kA172JNZlzOywi4Rmd9VyskUyvUL7zaeSKviBa/zNVJc4MFBME wiCx8DyWTrh0PYN9Y5QRbDyuerJQFnYBzl4bATgLikaoSxInGeyI7eQ0MZjucALkVU r7GiaY2iha0CsOOO5agcNfAi0o2FJCDvf+rYyFfw= Received: from localhost (localhost [127.0.0.1]) by uplift.swm.pp.se (Postfix) with ESMTP id F25899F; Thu, 29 Mar 2018 15:10:09 +0200 (CEST) Date: Thu, 29 Mar 2018 15:10:09 +0200 (CEST) From: Mikael Abrahamsson To: "Maxim Proshin [GMAIL]" cc: William Herrin , tcpm@ietf.org In-Reply-To: Message-ID: References: User-Agent: Alpine 2.20 (DEB 67 2015-01-07) Organization: People's Front Against WWW MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 13:10:16 -0000 On Thu, 29 Mar 2018, Maxim Proshin [GMAIL] wrote: > What is a status of classical PMTUD in Linux TCP? Is it enabled by default? > I guess it's enabled by default but TCP implementation actually relies on > IP for that. Classic PMTUD (as in getting back need-to-frag/Packet-too-big ICMP messages) is something TCP relies on by standard, and this is default on. The problem is when an ICMP error message isn't generated or doesn't reach the intended recipient, that's when blackhole occurs, and what I want to solve. -- Mikael Abrahamsson email: swmike@swm.pp.se From nobody Thu Mar 29 06:32:43 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8182912D953 for ; Thu, 29 Mar 2018 06:32:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.989 X-Spam-Level: X-Spam-Status: No, score=-1.989 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_SPF_PERMERROR=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vzm3jU91HBRt for ; Thu, 29 Mar 2018 06:32:41 -0700 (PDT) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 16A41126C22 for ; Thu, 29 Mar 2018 06:32:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=To:References:Message-Id: Content-Transfer-Encoding:Cc:Date:In-Reply-To:From:Subject:Mime-Version: Content-Type:Sender:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=ZGEIPGJQS7LjspNeyMCceyojXtVKs8L0tDuw2Tm5kXM=; b=v/5NIXxUO0c9y26lxD64EvCUY 8TtCEp+13PXL/jbuEC20+Uusv8FnKV1rd4wbAdEQShGQ/P4fbDboDJEUfNuHPGYRG06DQIBc486fR DEN8ydWXHHNs63DkWOC48ZHDv7riijQ3yOxd9lE0sdJYvlLQkRD//EIZ/SuJWbiSzDwu74yIyUq9Z nuiodDxtfF2o90zI/yGAVvxJEDYls6l+c/0GApO9yXovbILD5qXKTEF7naVMEi9dpgI3aPFzUqdHv OODtYZwvU5rAu/PfAGYaj2YIwMfCGSNTxuMz+sjgxzo8IBU4KKeUCqYLZLCkJnYXuNOzCJScSrLaY IDBtPljEg==; Received: from cpe-172-250-240-132.socal.res.rr.com ([172.250.240.132]:61759 helo=[192.168.1.158]) by server217.web-hosting.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1f1XfC-002DO5-W1; Thu, 29 Mar 2018 09:32:24 -0400 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (1.0) From: Joe Touch X-Mailer: iPad Mail (15D100) In-Reply-To: Date: Thu, 29 Mar 2018 06:32:22 -0700 Cc: William Herrin , tcpm@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: References: To: Mikael Abrahamsson X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 13:32:42 -0000 > On Mar 28, 2018, at 8:51 AM, Mikael Abrahamsson wrote: >=20 > So I have no idea how to come to a best conclusion regarding the tradeoff b= etween "doesn't work at all" and "doesn't work optimally in some cases". If making things more optimal in some cases causes some things to fail, you h= ave chosen poorly. The Internet=E2=80=99s use of one common interchange message is founded on t= he idea that =E2=80=9Cbeing able to talk to everyone someone=E2=80=9Dis more= important than =E2=80=9Cbeing able to talk to anyone more efficiently=E2=80= =9D. I.e Metcalfe=E2=80=99s law of utility is more important than performance. Joe= From nobody Thu Mar 29 07:10:48 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2FF08127076 for ; Thu, 29 Mar 2018 07:10:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.01 X-Spam-Level: X-Spam-Status: No, score=-2.01 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UxlAFsbmMZTC for ; Thu, 29 Mar 2018 07:10:44 -0700 (PDT) Received: from mail-io0-x229.google.com (mail-io0-x229.google.com [IPv6:2607:f8b0:4001:c06::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9E29C1242F7 for ; Thu, 29 Mar 2018 07:10:44 -0700 (PDT) Received: by mail-io0-x229.google.com with SMTP id 141so7815853iou.12 for ; Thu, 29 Mar 2018 07:10:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=5NsPZDRmBwIU+aVScn/LymE5LPm236E8oV95zOr/m8o=; b=HaQf3obfPR81jrBuQ6JohkLuPHNP4X649W1meN+ug+nTAWNXE8LMk4HcQ3Bzk8e3+p Hu25ytEST366eJddwbXCCpkudwM7VMNK0xhnycik+iiCAyEUacwc8gPHU8in2/e+DGS1 uS5PhD7Lmm9RhCMOE+20qbVUDkPGDhwosmvvaZHKhulpAIjtTLtYXO9S4n2WQi1YzAzG HUcfUYe360+Boh3Dur7KAnumWAv35kf+2/EfCM2dc36NY7rnNAg/KxoSPMyWp8SZbUKK 7Lut2r+ZfVp/Sy/F6dWQ9afkIGpWoTyZNnzu3MGCoa/4l/FqyahKTNPSVSD4l+CD/8S2 zyrw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=5NsPZDRmBwIU+aVScn/LymE5LPm236E8oV95zOr/m8o=; b=X7nA2or5cYQOrN+FSVkTj/bZEnSEPW6VjEl9cAblGqQEB31gvGqGoPRDs2FHyz14xV MNMO4mJBNgdRm8GKuBQlI2N23UgJSFncku+jOimuQSvazUCiAy1XjWTA3YzTnSUhZTiZ 2i+lh+Iu6S4rSgZlfSAerLcTzE9ms4VlaZYKTMTsYSTmdcmS90rA9O3fAzsSVnfxhabG S3o+KxwFkUjHRcFPA5EPpvPa+UDdzaJSMoCuHeyo1m8DTzFORVUOUumCU5R+enq3kuEn ty07d9Vc3hoWfcyOJQT9MopUJIvfcXSTGipGpTw8NyyAJns5mAGf+PmypgpL+gFAnaX+ Za4A== X-Gm-Message-State: AElRT7E9t8pETZS3TMnBUwDsM6gQz9UtJkGzDK7hkd4+qm451eQ7p6j2 cesU/gfmBQXVQ9svkc6znmF7K10KJ5P62VOkepmsdsKG0qQ= X-Google-Smtp-Source: AIpwx49VrxF8CH5f6WFu2eC0g0VvjJB7U8FIkRY8M00Rgr/XKpGVPjCJ0YDy2MWPxM9nWRmREWKGlB8gh7nNBQZLNW4= X-Received: by 10.107.171.65 with SMTP id u62mr31543971ioe.73.1522332643281; Thu, 29 Mar 2018 07:10:43 -0700 (PDT) MIME-Version: 1.0 Received: by 10.107.138.29 with HTTP; Thu, 29 Mar 2018 07:10:02 -0700 (PDT) In-Reply-To: <152229608335.23885.1229382205419997341@ietfa.amsl.com> References: <152229608335.23885.1229382205419997341@ietfa.amsl.com> From: Yuchung Cheng Date: Thu, 29 Mar 2018 07:10:02 -0700 Message-ID: To: "tcpm@ietf.org Extensions" Content-Type: text/plain; charset="UTF-8" Archived-At: Subject: Re: [tcpm] I-D Action: draft-ietf-tcpm-rfc793bis-08.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 14:10:47 -0000 Thanks for the update. I enjoy reading the new diffserv text. comments: The IPv4 specification [1] includes a precedence value in the Type of precedence will still have to check the precedence of incoming Service field (TOS), that was also modified in [15], and then segments and possibly raise the precedence level they use on the obsoleted by the definition of Differentiated Services (DiffServ) connection. [6]. In DiffServ the former precedence values are treated as Class Selector codepoints, and methods for compatible treatment are described in the DiffServ architecture. The RFC 793/1122 TCP specification includes logic intending to have connections use the highest precedence requested by either endpoint application, and to keep the precedence consistent throughout a connection. There is an assumption of bidirectional/symmetric precedence values, however, the DiffServ architecture is asymmetric. Problems were described in [17] and the solution described is to ignore IP precedence in TCP. Since RFC 2873 is a Standards Track document (although not marked as updating RFC 793), these checks are no longer a part of the TCP standard defined in this document, though the DiffServ field value is still is a part of the interface between TCP and the network layer, and values can be indicated both ways between TCP and the application. I am not entirely I get the main points this paragraph tries to convey. Are they 1. a TCP stack MUST implement RFC2873 2. precedence is obsoleted. ? Note that the DiffServ field is permitted to change during a connection (section 4.2.4.2 of RFC 1122). However, the application interface might not support this ability, and the application does not have knowledge about individual TCP segments, so this can only be done on a coarse granularity, at best. This limitation is further discussed in RFC 7657 (sec 5.1, 5.3, and 6) [37]. Generally, an application SHOULD NOT change the DiffServ field value during the course of a connection. The underlying assumptions of this text is 1. Application can not specify precisely the DiffServ at TCP segments level 2. TCP does not tolerate reordering well today As API and TCP evolve and socket API isn't the only one, it would be good to be explicit about these assumptions. e.g. "Generally an application SHOULD NOT change DiffServe field vale during the course of a connection because it may cause excessive reorderings and adversely hurts performance" nits: p32: s/the DiffServ field value is still is a part/ the DiffServ field value still is a part / p68: s/ SND.NEXT/SND.NXT/ p47: s/TCP may be buffer the data/TCP may buffer the data/ On Wed, Mar 28, 2018 at 9:01 PM, wrote: > > A New Internet-Draft is available from the on-line Internet-Drafts directories. > This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF. > > Title : Transmission Control Protocol Specification > Author : Wesley M. Eddy > Filename : draft-ietf-tcpm-rfc793bis-08.txt > Pages : 102 > Date : 2018-03-28 > > Abstract: > This document specifies the Internet's Transmission Control Protocol > (TCP). TCP is an important transport layer protocol in the Internet > stack, and has continuously evolved over decades of use and growth of > the Internet. Over this time, a number of changes have been made to > TCP as it was specified in RFC 793, though these have only been > documented in a piecemeal fashion. This document collects and brings > those changes together with the protocol specification from RFC 793. > This document obsoletes RFC 793, as well as 879, 2873, 6093, 6429, > 6528, and 6691 that updated parts of RFC 793. It updates RFC 1122, > and should be considered as a replacement for the portions of that > document dealing with TCP requirements. It updates RFC 5961 due to a > small clarification in reset handling while in the SYN-RECEIVED > state. > > RFC EDITOR NOTE: If approved for publication as an RFC, this should > be marked additionally as "STD: 7" and replace RFC 793 in that role. > > > > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc793bis/ > > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-tcpm-rfc793bis-08 > https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-rfc793bis-08 > > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rfc793bis-08 > > > Please note that it may take a couple of minutes from the time of submission > until the htmlized version and diff are available at tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm From nobody Thu Mar 29 08:03:34 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8B7BE1270AE for ; Thu, 29 Mar 2018 08:03:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7EvDR4OGBuX1 for ; Thu, 29 Mar 2018 08:03:29 -0700 (PDT) Received: from magic.dirtside.com (magics.dirtside.com [199.33.225.25]) by ietfa.amsl.com (Postfix) with ESMTP id 70A59120454 for ; Thu, 29 Mar 2018 08:03:28 -0700 (PDT) Received: from minoc.dirtside.com (minoc.dirtside.com [70.184.240.82]) by magic.dirtside.com (8.14.3/) with ESMTP id w2TF3HE8009381 for ; Thu, 29 Mar 2018 11:03:18 -0400 X-Really-To: Received: from mail-pf0-f177.google.com (mail-pf0-f177.google.com [209.85.192.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by minoc.dirtside.com (Postfix) with ESMTPSA id 9FE20EC857 for ; Thu, 29 Mar 2018 11:03:17 -0400 (EDT) Received: by mail-pf0-f177.google.com with SMTP id l27so3406593pfk.12 for ; Thu, 29 Mar 2018 08:03:17 -0700 (PDT) X-Gm-Message-State: AElRT7H43rDyVCnwyP1/8tdN1kiFogj+v95QIHnEp/LEdTA1yOyXglZh 0Rc+O+KgY/rBIDE5Nvd7rTqnUmdUV2+ePX7qxv8= X-Google-Smtp-Source: AIpwx4+4K0MW29uQu/SzDw9EkmEvPIGXONFFDlfCxcBHeI5ORgcwCU17kTKxTzZh6oyYasXMUCQDQXGHnlzo5Kurr3M= X-Received: by 2002:a17:902:8602:: with SMTP id f2-v6mr8558004plo.73.1522335795979; Thu, 29 Mar 2018 08:03:15 -0700 (PDT) MIME-Version: 1.0 Received: by 10.100.183.67 with HTTP; Thu, 29 Mar 2018 08:02:55 -0700 (PDT) In-Reply-To: References: From: William Herrin Date: Thu, 29 Mar 2018 11:02:55 -0400 X-Gmail-Original-Message-ID: Message-ID: To: Joe Touch Cc: Mikael Abrahamsson , tcpm@ietf.org Content-Type: text/plain; charset="UTF-8" X-Spam-Checker: magic.dirtside.com Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 15:03:32 -0000 On Thu, Mar 29, 2018 at 9:32 AM, Joe Touch wrote: >> On Mar 28, 2018, at 8:51 AM, Mikael Abrahamsson wrote: >> So I have no idea how to come to a best conclusion regarding the tradeoff between "doesn't work at all" and "doesn't work optimally in some cases". > > If making things more optimal in some cases causes some things to fail, you have chosen poorly. Hi Joe, Status quo is "doesn't work at all," the PMTUD black hole problem. PMTUD is arguably a design defect in IP: one of few cases in which the end to end principle is abandoned, requiring the intermediate router to communicate with an endpoint or else end to end communication fails. It's also arguable that every instance of a PMTUD black hole is a consequence of an operator configuration error. PLPMTUD is proposed as "doesn't work optimally in some cases." More to the point: suffers in common packet loss scenarios. Everybody takes a performance penalty to overcome common operator configuration errors. Alternatives to PLPMTUD include configuring the local TCP stack's MSS to the IPv6 minimum MTU (1280 bytes). This pretty much eliminates the PMTUD black hole problem by eliminating the need for detection. There's a negligible performance hit but a slightly increased consumption of bandwidth in the normal case. I've used this on my servers for years and the bottom line is that it works. It's also fair to wonder why router and firewall vendors don't offer configurations designed to mitigate the PMTUD black hole problem. Firewall vendors could warn on attempts to block ICMP or require explicit overrides to block ICMP destination unreachable messages. Router vendors could offer a configuration option to issue ICMP destination unreachables from the a configured public IP address rather than from the interface's (sometimes private) IP address. They don't do these things. In principle the IETF could even designate a standard public IP address to be used when routers that have no public IP addresses need to issue a a fragmentation needed message. After a couple equipment cycles the PMTUD black hole problem would presumably fall back to 1990s levels which weren't so bad. On Wed, Mar 28, 2018 at 11:51 AM, Mikael Abrahamsson wrote: > 1. IPv6 doesn't have a DF bit that can be on or off, it's always implicitly > on. Thanks Mikael, I didn't realize that. > 2. Fragmentation doesn't usually happen if there is PMTUD blackhole. Do we have data on this? Is it a general case issue where routers refuse to fragment packets even if the DF bit is clear? We expect the router to forward a small enough unfragmented packet onward. I can't think of a reason that the PMTUD black holes and routers failing to fragment IPv4 packets where DF is clear would be linked issues. Regards, Bill Herrin -- William Herrin ................ herrin@dirtside.com bill@herrin.us Dirtside Systems ......... Web: From nobody Thu Mar 29 08:31:36 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1E67912D957 for ; Thu, 29 Mar 2018 08:31:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.31 X-Spam-Level: X-Spam-Status: No, score=-4.31 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=swm.pp.se Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6rHoRF2UUKz3 for ; Thu, 29 Mar 2018 08:31:32 -0700 (PDT) Received: from uplift.swm.pp.se (ipv6.swm.pp.se [IPv6:2a00:801::f]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 24CC0127201 for ; Thu, 29 Mar 2018 08:31:32 -0700 (PDT) Received: by uplift.swm.pp.se (Postfix, from userid 501) id 0E8DDAF; Thu, 29 Mar 2018 17:31:30 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=swm.pp.se; s=mail; t=1522337490; bh=FiGgzbZ37ZzWq/26VX9O6G79Uq20l3jWVWcUqoK9h9o=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=3YYmw9wqd98kgdFRx8wgGUjxCRY3FnD7UeiP9En37HknXsUApxdG0nYb6MjGjpcbS F5V2KbBKDGf6EaUzWLRsZV0ujWitmSa/FRzOblgMdTPT+36jdYyggcBLuoMp/sJ3ig S4MlU6ILzWpfpTDRTKEYmZ9Z86Zs8m9jgFHW+qWI= Received: from localhost (localhost [127.0.0.1]) by uplift.swm.pp.se (Postfix) with ESMTP id 0C7B69F; Thu, 29 Mar 2018 17:31:30 +0200 (CEST) Date: Thu, 29 Mar 2018 17:31:30 +0200 (CEST) From: Mikael Abrahamsson To: William Herrin cc: Joe Touch , tcpm@ietf.org In-Reply-To: Message-ID: References: User-Agent: Alpine 2.20 (DEB 67 2015-01-07) Organization: People's Front Against WWW MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 15:31:35 -0000 On Thu, 29 Mar 2018, William Herrin wrote: > fails. It's also arguable that every instance of a PMTUD black hole is > a consequence of an operator configuration error. Some are, some are not. > It's also fair to wonder why router and firewall vendors don't offer > configurations designed to mitigate the PMTUD black hole problem. > Firewall vendors could warn on attempts to block ICMP or require > explicit overrides to block ICMP destination unreachable messages. > Router vendors could offer a configuration option to issue ICMP > destination unreachables from the a configured public IP address rather > than from the interface's (sometimes private) IP address. They don't do > these things. These are some reasons for PMTUD blackhole, but far from all. Some are caused by anycast configurations where the ICMP packet simply doesn't make it to the node that needs it. Load balancers doing the wrong thing. > In principle the IETF could even designate a standard public IP address > to be used when routers that have no public IP addresses need to issue a > a fragmentation needed message. After a couple equipment cycles the > PMTUD black hole problem would presumably fall back to 1990s levels > which weren't so bad. My take on this is that operators should do the right thing (make PMTUD work), and protocols should handle when things go wrong. I have very little problem with TCP using an extremely stupid algorithm as in "I'll use PMTUD, but if it doesn't work I'm going to try 576/1280, and if that works I sometimes go back to PMTUD value to see if things have improved". This still means it'll work, somewhat. -- Mikael Abrahamsson email: swmike@swm.pp.se From nobody Thu Mar 29 08:47:29 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D59B412DA22 for ; Thu, 29 Mar 2018 08:47:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.989 X-Spam-Level: X-Spam-Status: No, score=-1.989 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_SPF_PERMERROR=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id w2aIbN2wcuFw for ; Thu, 29 Mar 2018 08:47:14 -0700 (PDT) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9098912DA17 for ; Thu, 29 Mar 2018 08:47:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=Message-ID:References:In-Reply-To:Subject:Cc: To:From:Date:Content-Transfer-Encoding:Content-Type:MIME-Version:Sender: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=ouoBy5+yyzTH/bRTS+IgjBxCChjkbnRe4Kx0IrJzdYo=; b=POwFqgO+XkO2ct3vpTQorYau3a 9fCemjU63VhrhTIg7bESUK9CjLGBncQf68iOheZKZSjbqSkYUVAzDQajKKWTREAtnMMmBumEzvS5F 8B+Kg5cWs9btiHAqj52YvJSadUKoj3aEOCy7CHlzQbVN7JbDeHBlXDzzKOx2oRc5niR4ttH/mOShn tiTZC1TefkNPK4bZUyVZrrrwHejKb1WdFeF3GU6OtvJ45c+ewknR2Sqkv4kMbZX5iriYqPJBHtv1v eW+CpL9idqOEbUX7syrDLvwsvX/P+iUldfUoXLZcaYqYw7v8K376TXA4epVjChdHT0o132dAZqpiI Z+ALcmug==; Received: from [::1] (port=34544 helo=webmail.strayalpha.com) by server217.web-hosting.com with esmtpa (Exim 4.89_1) (envelope-from ) id 1f1ZlQ-000H2Z-0N; Thu, 29 Mar 2018 11:46:57 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Date: Thu, 29 Mar 2018 11:46:55 -0400 From: touch@strayalpha.com To: "Brian Weis (bew)" Cc: RFC Editor , ekr@rtfm.com, tuexen@fh-muenster.de, tcpm@ietf.org, ietf@kuehlewind.net In-Reply-To: <8B1FAC72-2B18-4406-A3D3-E3BE5524EB59@cisco.com> References: <20180226190209.F3D43B80E1F@rfc-editor.org> <8B1FAC72-2B18-4406-A3D3-E3BE5524EB59@cisco.com> Message-ID: X-Sender: touch@strayalpha.com User-Agent: Roundcube Webmail/1.2.7 X-OutGoing-Spam-Status: No, score=-0.2 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] [Technical Errata Reported] RFC5926 (5267) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 15:47:22 -0000 On 2018-03-28 15:42, Brian Weis (bew) wrote: > Hi Joe, > > Sorry, I missed your reply to this before the errata was rejected. > >> On Feb 28, 2018, at 6:56 AM, Joe Touch wrote: >> >> >> Hi, all, >> >> This errata should be rejected. >> >> NIST-SP800-108 does not require the use of 0x00 (see cited text >> below). It only requires that the length and order of each field be >> defined unambiguously. > > This is correct. The issue is whether all TCP-AO implementations > implementing NIST SP800-108 all add the 0x00 or not. If there is > confusion between implementations then they will not generate the same > session keys. We use a fixed string ("TCP-AO"), not a variable one. As a result, we don't need a flag to indicate the length of the string, and the flag 0x00 is only one way to do such an indication (vs. a second length field or other flag value). Page 11 footnote of the NIST spec explains this. > >> The length of “TCP-AO” is clearly and unambiguously 6 octets, as >> defined in the existing RFC text. The method of providing that >> length unambiguously to the KDF algorithm is an implementation >> issue. > > I disagree that it is unambiguously 6 octets. The use of > double-quotes is often construed as a null-terminated string. strlen("TCP-AO") = 6. The null is a C encoding. Other languages use other ways to indicate the length of the string. > This can > be read as a null-terminated 7 octet string. That actually cannot be expressed in C. Strings in C cannot have internal nulls; they would be interpreted as terminators. > In fact, this is the > exact question asked by an implementor, and why I filed the errata. I > believe it is a reasonable request to clarify this one way or the > other. Neither Mirja nor I read the NIST spec that way. C strlen agrees with us too. I really think the implementer is getting wrapped around implementation details, which are both language and implementation specific and don't need to be in the spec IMO. Joe > > If you agree with this, I’ll open another errata indicating the > problem more clearly. > > My preference for clarifying that it does include the 0x00 is for > safety. While the current RFC has only one label field (“TCP-AO”), > if another string _beginning_ with ‘TCP-AO’ were also defined then > there could be confusion between the two generated keys. Since the > cost of adding 0x00 to the calculation is negligible, it seems prudent > to be safe. > > Thanks, > Brian > >> Joe >> >> The following text is clear that 0x00 is optional: >> >>> 12) 0x00 – An all zero octet. An optional data field used to >>> indicate a separation of different variable length data fields1. >>> >>> 1 This indicator may be considered as a part of the encoding >>> method for the input data and can be replaced by other indicators, >>> for example, an indicator to represent the length of the variable >>> length field. If, for a specific KDF, only data fields with >>> identical length are used, then the indicator may be omitted. >> >> and later, 0x00 is given as a choice used in the example presented, >> not as a requirement: >> >>> The length for each data field and an order shall be defined >>> unambiguously. For example, the length and the order may be >>> defined as a part of a KDF specification or by the protocol where >>> the KDF is used. In each of the following sections, a specific >>> order for the feedback value, the counter, the Label, the >>> separation indicator 0x00, the Context, and [L]2 is used, assuming >>> that each of them is represented with a specific length. This >>> Recommendation specifies several families of KDFs. Alternative >>> orders for the input data fields may be used for different KDFs. >> >> --------------------- >> >>> On Feb 26, 2018, at 11:02 AM, RFC Errata System >>> wrote: >>> >>> The following errata report has been submitted for RFC5926, >>> "Cryptographic Algorithms for the TCP Authentication Option >>> (TCP-AO)". >>> >>> -------------------------------------- >>> You may review the report below and at: >>> http://www.rfc-editor.org/errata/eid5267 >>> >>> -------------------------------------- >>> Type: Technical >>> Reported by: Brian Weis >>> >>> Section: 3.1.1 >>> >>> Original Text >>> ------------- >>> - Label: A binary string that clearly identifies the purpose >>> of this KDF's derived keying material. For >>> TCP-AO, >>> we use the ASCII string "TCP-AO", where the last >>> character is the capital letter "O", not to be >>> confused with a zero. While this may seem like >>> overkill in this specification since TCP-AO only >>> describes one call to the KDF, it is included in >>> order to comply with FIPS 140 certifications. >>> >>> Corrected Text >>> -------------- >>> - Label: A binary string that clearly identifies the purpose >>> of this KDF's derived keying material. For >>> TCP-AO, >>> we use the ASCII string "TCP-AO", where the last >>> character is the capital letter "O", not to be >>> confused with a zero. The ASCII string is >>> terminated >>> with a null octet (0x00). While this may seem >>> like >>> overkill in this specification since TCP-AO only >>> describes one call to the KDF, it is included in >>> order to comply with FIPS 140 certifications. >>> >>> Notes >>> ----- >>> This section states that "Both of these KDFs are based on the >>> iteration-mode KDFs specified in [NIST-SP800-108].", which is >>> later clarified to be the "counter mode" KDF defined in that >>> document. The definition of the "Label" input to the KDF in the >>> original text is not clear. >>> >>> [NIST-SP800-108] specifies that a 0x00 octet should follow the >>> Label. This 0x00 octet is important when the KDF does not have >>> control over the Context given it, which is the case here -- RFC >>> 5926 depends on the definition in RFC 5925. RFC 5925 currently >>> declares two fixed-size inputs for the Context (See Figures 7 & 8 >>> of RFC 5925), so the Context length differs. Also, RFC 5925 RFC >>> could be updated over over time to include other Contexts that are >>> variable sized. The risk of excluding 0x00 is enabling an attacker >>> to choose a specially-crafted Context that violates the clean >>> separation between the Label and Context arguments. Therefore, it >>> is important to include the 0x00 octet for TCP-AO. >> >>> I believe this 0x00 is implied in the specification of the string >>> "TCP-AO", since conventionally many string definitions include a >>> trailing 0x00 octet, The text should state that the 0x00 octet is >>> present as part of the string. >>> >>> If this errata does not result in adding the 0x00 octet, then its >>> omission needs to be justified. >>> >>> Instructions: >>> ------------- >>> This erratum is currently posted as "Reported". If necessary, >>> please >>> use "Reply All" to discuss whether it should be verified or >>> rejected. When a decision is reached, the verifying party >>> can log in to change the status and edit the report, if necessary. >>> >>> >>> -------------------------------------- >>> RFC5926 (draft-ietf-tcpm-tcp-ao-crypto-03) >>> -------------------------------------- >>> Title : Cryptographic Algorithms for the TCP >>> Authentication Option (TCP-AO) >>> Publication Date : June 2010 >>> Author(s) : G. Lebovitz, E. Rescorla >>> Category : PROPOSED STANDARD >>> Source : TCP Maintenance and Minor Extensions >>> Area : Transport >>> Stream : IETF >>> Verifying Party : IESG >>> >>> _______________________________________________ >>> tcpm mailing list >>> tcpm@ietf.org >>> https://www.ietf.org/mailman/listinfo/tcpm >> >> _______________________________________________ >> tcpm mailing list >> tcpm@ietf.org >> https://www.ietf.org/mailman/listinfo/tcpm > > -- > Brian Weis > Security, CSG, Cisco Systems > Telephone: +1 408 526 4796 > Email: bew@cisco.com From nobody Thu Mar 29 08:55:43 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9B35412DA41 for ; Thu, 29 Mar 2018 08:55:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.909 X-Spam-Level: X-Spam-Status: No, score=-1.909 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: aero.org X-MS-Exchange-CrossTenant-Network-Message-Id: c3bcf6b3-995d-48d7-4a0d-08d5958d7d44 X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Mar 2018 15:55:26.5941 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: c8294700-c5a4-4ca1-a876-1457d39899fd X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR09MB2279 Archived-At: Subject: Re: [tcpm] [Technical Errata Reported] RFC5926 (5267) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 15:55:41 -0000 Do you need to specify the character encoding (something like utf-8 encodin= g of unicode or ASCII) to guarantee that the string is 6 octets? -- Ted Faber Senior Engineering Specialist Computer Systems Research Department The Aerospace Corporation 310-336-7373 ________________________________________ From: tcpm on behalf of touch@strayalpha.com Sent: Thursday, March 29, 2018 08:46 To: Brian Weis (bew) Cc: tcpm@ietf.org; ekr@rtfm.com; tuexen@fh-muenster.de; ietf@kuehlewind.net= ; RFC Editor Subject: Re: [tcpm] [Technical Errata Reported] RFC5926 (5267) On 2018-03-28 15:42, Brian Weis (bew) wrote: > Hi Joe, > > Sorry, I missed your reply to this before the errata was rejected. > >> On Feb 28, 2018, at 6:56 AM, Joe Touch wrote: >> >> >> Hi, all, >> >> This errata should be rejected. >> >> NIST-SP800-108 does not require the use of 0x00 (see cited text >> below). It only requires that the length and order of each field be >> defined unambiguously. > > This is correct. The issue is whether all TCP-AO implementations > implementing NIST SP800-108 all add the 0x00 or not. If there is > confusion between implementations then they will not generate the same > session keys. We use a fixed string ("TCP-AO"), not a variable one. As a result, we don't need a flag to indicate the length of the string, and the flag 0x00 is only one way to do such an indication (vs. a second length field or other flag value). Page 11 footnote of the NIST spec explains this. > >> The length of =93TCP-AO=94 is clearly and unambiguously 6 octets, as >> defined in the existing RFC text. The method of providing that >> length unambiguously to the KDF algorithm is an implementation >> issue. > > I disagree that it is unambiguously 6 octets. The use of > double-quotes is often construed as a null-terminated string. strlen("TCP-AO") =3D 6. The null is a C encoding. Other languages use other ways to indicate the length of the string. > This can > be read as a null-terminated 7 octet string. That actually cannot be expressed in C. Strings in C cannot have internal nulls; they would be interpreted as terminators. > In fact, this is the > exact question asked by an implementor, and why I filed the errata. I > believe it is a reasonable request to clarify this one way or the > other. Neither Mirja nor I read the NIST spec that way. C strlen agrees with us too. I really think the implementer is getting wrapped around implementation details, which are both language and implementation specific and don't need to be in the spec IMO. Joe > > If you agree with this, I=92ll open another errata indicating the > problem more clearly. > > My preference for clarifying that it does include the 0x00 is for > safety. While the current RFC has only one label field (=93TCP-AO=94), > if another string _beginning_ with =91TCP-AO=92 were also defined then > there could be confusion between the two generated keys. Since the > cost of adding 0x00 to the calculation is negligible, it seems prudent > to be safe. > > Thanks, > Brian > >> Joe >> >> The following text is clear that 0x00 is optional: >> >>> 12) 0x00 =96 An all zero octet. An optional data field used to >>> indicate a separation of different variable length data fields1. >>> >>> 1 This indicator may be considered as a part of the encoding >>> method for the input data and can be replaced by other indicators, >>> for example, an indicator to represent the length of the variable >>> length field. If, for a specific KDF, only data fields with >>> identical length are used, then the indicator may be omitted. >> >> and later, 0x00 is given as a choice used in the example presented, >> not as a requirement: >> >>> The length for each data field and an order shall be defined >>> unambiguously. For example, the length and the order may be >>> defined as a part of a KDF specification or by the protocol where >>> the KDF is used. In each of the following sections, a specific >>> order for the feedback value, the counter, the Label, the >>> separation indicator 0x00, the Context, and [L]2 is used, assuming >>> that each of them is represented with a specific length. This >>> Recommendation specifies several families of KDFs. Alternative >>> orders for the input data fields may be used for different KDFs. >> >> --------------------- >> >>> On Feb 26, 2018, at 11:02 AM, RFC Errata System >>> wrote: >>> >>> The following errata report has been submitted for RFC5926, >>> "Cryptographic Algorithms for the TCP Authentication Option >>> (TCP-AO)". >>> >>> -------------------------------------- >>> You may review the report below and at: >>> http://www.rfc-editor.org/errata/eid5267 >>> >>> -------------------------------------- >>> Type: Technical >>> Reported by: Brian Weis >>> >>> Section: 3.1.1 >>> >>> Original Text >>> ------------- >>> - Label: A binary string that clearly identifies the purpose >>> of this KDF's derived keying material. For >>> TCP-AO, >>> we use the ASCII string "TCP-AO", where the last >>> character is the capital letter "O", not to be >>> confused with a zero. While this may seem like >>> overkill in this specification since TCP-AO only >>> describes one call to the KDF, it is included in >>> order to comply with FIPS 140 certifications. >>> >>> Corrected Text >>> -------------- >>> - Label: A binary string that clearly identifies the purpose >>> of this KDF's derived keying material. For >>> TCP-AO, >>> we use the ASCII string "TCP-AO", where the last >>> character is the capital letter "O", not to be >>> confused with a zero. The ASCII string is >>> terminated >>> with a null octet (0x00). While this may seem >>> like >>> overkill in this specification since TCP-AO only >>> describes one call to the KDF, it is included in >>> order to comply with FIPS 140 certifications. >>> >>> Notes >>> ----- >>> This section states that "Both of these KDFs are based on the >>> iteration-mode KDFs specified in [NIST-SP800-108].", which is >>> later clarified to be the "counter mode" KDF defined in that >>> document. The definition of the "Label" input to the KDF in the >>> original text is not clear. >>> >>> [NIST-SP800-108] specifies that a 0x00 octet should follow the >>> Label. This 0x00 octet is important when the KDF does not have >>> control over the Context given it, which is the case here -- RFC >>> 5926 depends on the definition in RFC 5925. RFC 5925 currently >>> declares two fixed-size inputs for the Context (See Figures 7 & 8 >>> of RFC 5925), so the Context length differs. Also, RFC 5925 RFC >>> could be updated over over time to include other Contexts that are >>> variable sized. The risk of excluding 0x00 is enabling an attacker >>> to choose a specially-crafted Context that violates the clean >>> separation between the Label and Context arguments. Therefore, it >>> is important to include the 0x00 octet for TCP-AO. >> >>> I believe this 0x00 is implied in the specification of the string >>> "TCP-AO", since conventionally many string definitions include a >>> trailing 0x00 octet, The text should state that the 0x00 octet is >>> present as part of the string. >>> >>> If this errata does not result in adding the 0x00 octet, then its >>> omission needs to be justified. >>> >>> Instructions: >>> ------------- >>> This erratum is currently posted as "Reported". If necessary, >>> please >>> use "Reply All" to discuss whether it should be verified or >>> rejected. When a decision is reached, the verifying party >>> can log in to change the status and edit the report, if necessary. >>> >>> >>> -------------------------------------- >>> RFC5926 (draft-ietf-tcpm-tcp-ao-crypto-03) >>> -------------------------------------- >>> Title : Cryptographic Algorithms for the TCP >>> Authentication Option (TCP-AO) >>> Publication Date : June 2010 >>> Author(s) : G. Lebovitz, E. Rescorla >>> Category : PROPOSED STANDARD >>> Source : TCP Maintenance and Minor Extensions >>> Area : Transport >>> Stream : IETF >>> Verifying Party : IESG >>> >>> _______________________________________________ >>> tcpm mailing list >>> tcpm@ietf.org >>> https://www.ietf.org/mailman/listinfo/tcpm >> >> _______________________________________________ >> tcpm mailing list >> tcpm@ietf.org >> https://www.ietf.org/mailman/listinfo/tcpm > > -- > Brian Weis > Security, CSG, Cisco Systems > Telephone: +1 408 526 4796 > Email: bew@cisco.com _______________________________________________ tcpm mailing list tcpm@ietf.org https://www.ietf.org/mailman/listinfo/tcpm From nobody Thu Mar 29 08:58:45 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 07D2E12DA44 for ; Thu, 29 Mar 2018 08:58:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.989 X-Spam-Level: X-Spam-Status: No, score=-1.989 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_SPF_PERMERROR=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jTcC1jFvp-DK for ; Thu, 29 Mar 2018 08:58:41 -0700 (PDT) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1F634129C53 for ; Thu, 29 Mar 2018 08:58:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=To:References:Message-Id: Content-Transfer-Encoding:Cc:Date:In-Reply-To:From:Subject:Mime-Version: Content-Type:Sender:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=ogcCIN43HeMenHpTXbdsKAz7rXxF5R/JBYX/NsHvhS4=; b=EqZIASqQYeeZczo6TJKFh6yyY h7UCuVmWNSwnlXHif+SDwfV32k+p6O51NunGgY8EnKuyaYYzyB15IRhrBTCM0aTDJQJNEwL+9juP5 nYavD22iDx5OcbFtQGw7e+Rx3PJGtIAV7hONhrRK2jUGRgK3JjfGImR+htL1of+itLfbIJen6qzJz 0Y+ahK1nDmx13HLMpv/3dfibRIbbEW+hYAYMtar5n54wUbHWNnCIFD/r6t/PYnyIkbfH0jiLovmpL A7aGbA3et2YgN0ZqZKa7pTw/AZc7H9VP3B7t2S7yUKIjbXxIlX4qDSl+i/fNHvEDy447PJjeCxKfL mL9wm1ccw==; Received: from [204.140.240.55] (port=59463 helo=[172.26.50.233]) by server217.web-hosting.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1f1ZwN-000Rdi-PA; Thu, 29 Mar 2018 11:58:19 -0400 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (1.0) From: Joe Touch X-Mailer: iPhone Mail (15D100) In-Reply-To: Date: Thu, 29 Mar 2018 08:58:09 -0700 Cc: "Brian Weis (bew)" , "tcpm@ietf.org" , "ekr@rtfm.com" , "tuexen@fh-muenster.de" , "ietf@kuehlewind.net" , RFC Editor Content-Transfer-Encoding: quoted-printable Message-Id: <17949435-4F25-45B6-9D3A-248148B1D2C1@strayalpha.com> References: <20180226190209.F3D43B80E1F@rfc-editor.org> <8B1FAC72-2B18-4406-A3D3-E3BE5524EB59@cisco.com> To: Theodore V Faber X-OutGoing-Spam-Status: No, score=-0.2 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] [Technical Errata Reported] RFC5926 (5267) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 15:58:44 -0000 We spec the label as those 6 characters as ASCII.=20 Joe > On Mar 29, 2018, at 8:55 AM, Theodore V Faber w= rote: >=20 > Do you need to specify the character encoding (something like utf-8 encodi= ng of unicode or ASCII) to guarantee that the string is 6 octets? >=20 > -- > Ted Faber > Senior Engineering Specialist > Computer Systems Research Department > The Aerospace Corporation > 310-336-7373 >=20 >=20 > ________________________________________ > From: tcpm on behalf of touch@strayalpha.com > Sent: Thursday, March 29, 2018 08:46 > To: Brian Weis (bew) > Cc: tcpm@ietf.org; ekr@rtfm.com; tuexen@fh-muenster.de; ietf@kuehlewind.ne= t; RFC Editor > Subject: Re: [tcpm] [Technical Errata Reported] RFC5926 (5267) >=20 >> On 2018-03-28 15:42, Brian Weis (bew) wrote: >> Hi Joe, >>=20 >> Sorry, I missed your reply to this before the errata was rejected. >>=20 >>> On Feb 28, 2018, at 6:56 AM, Joe Touch wrote: >>>=20 >>>=20 >>> Hi, all, >>>=20 >>> This errata should be rejected. >>>=20 >>> NIST-SP800-108 does not require the use of 0x00 (see cited text >>> below). It only requires that the length and order of each field be >>> defined unambiguously. >>=20 >> This is correct. The issue is whether all TCP-AO implementations >> implementing NIST SP800-108 all add the 0x00 or not. If there is >> confusion between implementations then they will not generate the same >> session keys. >=20 > We use a fixed string ("TCP-AO"), not a variable one. As a result, we > don't need a flag to indicate the length of the string, and the flag > 0x00 is only one way to do such an indication (vs. a second length field > or other flag value). Page 11 footnote of the NIST spec explains this. >=20 >>=20 >>> The length of =E2=80=9CTCP-AO=E2=80=9D is clearly and unambiguously 6 oc= tets, as >>> defined in the existing RFC text. The method of providing that >>> length unambiguously to the KDF algorithm is an implementation >>> issue. >>=20 >> I disagree that it is unambiguously 6 octets. The use of >> double-quotes is often construed as a null-terminated string. >=20 > strlen("TCP-AO") =3D 6. >=20 > The null is a C encoding. Other languages use other ways to indicate the > length of the string. >=20 >=20 >> This can >> be read as a null-terminated 7 octet string. >=20 > That actually cannot be expressed in C. Strings in C cannot have > internal nulls; they would be interpreted as terminators. >=20 >> In fact, this is the >> exact question asked by an implementor, and why I filed the errata. I >> believe it is a reasonable request to clarify this one way or the >> other. >=20 > Neither Mirja nor I read the NIST spec that way. C strlen agrees with us > too. >=20 > I really think the implementer is getting wrapped around implementation > details, which are both language and implementation specific and don't > need to be in the spec IMO. >=20 > Joe >=20 >=20 >>=20 >> If you agree with this, I=E2=80=99ll open another errata indicating the >> problem more clearly. >>=20 >> My preference for clarifying that it does include the 0x00 is for >> safety. While the current RFC has only one label field (=E2=80=9CTCP-AO=E2= =80=9D), >> if another string _beginning_ with =E2=80=98TCP-AO=E2=80=99 were also def= ined then >> there could be confusion between the two generated keys. Since the >> cost of adding 0x00 to the calculation is negligible, it seems prudent >> to be safe. >>=20 >> Thanks, >> Brian >>=20 >>> Joe >>>=20 >>> The following text is clear that 0x00 is optional: >>>=20 >>>> 12) 0x00 =E2=80=93 An all zero octet. An optional data field used to >>>> indicate a separation of different variable length data fields1. >>>>=20 >>>> 1 This indicator may be considered as a part of the encoding >>>> method for the input data and can be replaced by other indicators, >>>> for example, an indicator to represent the length of the variable >>>> length field. If, for a specific KDF, only data fields with >>>> identical length are used, then the indicator may be omitted. >>>=20 >>> and later, 0x00 is given as a choice used in the example presented, >>> not as a requirement: >>>=20 >>>> The length for each data field and an order shall be defined >>>> unambiguously. For example, the length and the order may be >>>> defined as a part of a KDF specification or by the protocol where >>>> the KDF is used. In each of the following sections, a specific >>>> order for the feedback value, the counter, the Label, the >>>> separation indicator 0x00, the Context, and [L]2 is used, assuming >>>> that each of them is represented with a specific length. This >>>> Recommendation specifies several families of KDFs. Alternative >>>> orders for the input data fields may be used for different KDFs. >>>=20 >>> --------------------- >>>=20 >>>> On Feb 26, 2018, at 11:02 AM, RFC Errata System >>>> wrote: >>>>=20 >>>> The following errata report has been submitted for RFC5926, >>>> "Cryptographic Algorithms for the TCP Authentication Option >>>> (TCP-AO)". >>>>=20 >>>> -------------------------------------- >>>> You may review the report below and at: >>>> http://www.rfc-editor.org/errata/eid5267 >>>>=20 >>>> -------------------------------------- >>>> Type: Technical >>>> Reported by: Brian Weis >>>>=20 >>>> Section: 3.1.1 >>>>=20 >>>> Original Text >>>> ------------- >>>> - Label: A binary string that clearly identifies the purpose >>>> of this KDF's derived keying material. For >>>> TCP-AO, >>>> we use the ASCII string "TCP-AO", where the last >>>> character is the capital letter "O", not to be >>>> confused with a zero. While this may seem like >>>> overkill in this specification since TCP-AO only >>>> describes one call to the KDF, it is included in >>>> order to comply with FIPS 140 certifications. >>>>=20 >>>> Corrected Text >>>> -------------- >>>> - Label: A binary string that clearly identifies the purpose >>>> of this KDF's derived keying material. For >>>> TCP-AO, >>>> we use the ASCII string "TCP-AO", where the last >>>> character is the capital letter "O", not to be >>>> confused with a zero. The ASCII string is >>>> terminated >>>> with a null octet (0x00). While this may seem >>>> like >>>> overkill in this specification since TCP-AO only >>>> describes one call to the KDF, it is included in >>>> order to comply with FIPS 140 certifications. >>>>=20 >>>> Notes >>>> ----- >>>> This section states that "Both of these KDFs are based on the >>>> iteration-mode KDFs specified in [NIST-SP800-108].", which is >>>> later clarified to be the "counter mode" KDF defined in that >>>> document. The definition of the "Label" input to the KDF in the >>>> original text is not clear. >>>>=20 >>>> [NIST-SP800-108] specifies that a 0x00 octet should follow the >>>> Label. This 0x00 octet is important when the KDF does not have >>>> control over the Context given it, which is the case here -- RFC >>>> 5926 depends on the definition in RFC 5925. RFC 5925 currently >>>> declares two fixed-size inputs for the Context (See Figures 7 & 8 >>>> of RFC 5925), so the Context length differs. Also, RFC 5925 RFC >>>> could be updated over over time to include other Contexts that are >>>> variable sized. The risk of excluding 0x00 is enabling an attacker >>>> to choose a specially-crafted Context that violates the clean >>>> separation between the Label and Context arguments. Therefore, it >>>> is important to include the 0x00 octet for TCP-AO. >>>=20 >>>> I believe this 0x00 is implied in the specification of the string >>>> "TCP-AO", since conventionally many string definitions include a >>>> trailing 0x00 octet, The text should state that the 0x00 octet is >>>> present as part of the string. >>>>=20 >>>> If this errata does not result in adding the 0x00 octet, then its >>>> omission needs to be justified. >>>>=20 >>>> Instructions: >>>> ------------- >>>> This erratum is currently posted as "Reported". If necessary, >>>> please >>>> use "Reply All" to discuss whether it should be verified or >>>> rejected. When a decision is reached, the verifying party >>>> can log in to change the status and edit the report, if necessary. >>>>=20 >>>>=20 >>>> -------------------------------------- >>>> RFC5926 (draft-ietf-tcpm-tcp-ao-crypto-03) >>>> -------------------------------------- >>>> Title : Cryptographic Algorithms for the TCP >>>> Authentication Option (TCP-AO) >>>> Publication Date : June 2010 >>>> Author(s) : G. Lebovitz, E. Rescorla >>>> Category : PROPOSED STANDARD >>>> Source : TCP Maintenance and Minor Extensions >>>> Area : Transport >>>> Stream : IETF >>>> Verifying Party : IESG >>>>=20 >>>> _______________________________________________ >>>> tcpm mailing list >>>> tcpm@ietf.org >>>> https://www.ietf.org/mailman/listinfo/tcpm >>>=20 >>> _______________________________________________ >>> tcpm mailing list >>> tcpm@ietf.org >>> https://www.ietf.org/mailman/listinfo/tcpm >>=20 >> -- >> Brian Weis >> Security, CSG, Cisco Systems >> Telephone: +1 408 526 4796 >> Email: bew@cisco.com >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm From nobody Thu Mar 29 09:58:45 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8643212DA1C for ; Thu, 29 Mar 2018 09:58:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ym1P8cph7OfB for ; Thu, 29 Mar 2018 09:58:40 -0700 (PDT) Received: from magic.dirtside.com (magics.dirtside.com [199.33.225.25]) by ietfa.amsl.com (Postfix) with ESMTP id 88D39127522 for ; Thu, 29 Mar 2018 09:58:40 -0700 (PDT) Received: from minoc.dirtside.com (minoc.dirtside.com [70.184.240.82]) by magic.dirtside.com (8.14.3/) with ESMTP id w2TGwTEW011504 for ; Thu, 29 Mar 2018 12:58:30 -0400 X-Really-To: Received: from mail-pg0-f44.google.com (mail-pg0-f44.google.com [74.125.83.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by minoc.dirtside.com (Postfix) with ESMTPSA id 99E8EEBF62 for ; Thu, 29 Mar 2018 12:58:29 -0400 (EDT) Received: by mail-pg0-f44.google.com with SMTP id i194so3446098pgd.0 for ; Thu, 29 Mar 2018 09:58:29 -0700 (PDT) X-Gm-Message-State: AElRT7FUTNDMNp91ZtN8siVVSCJomKrqBrujo0XpWRytU0NnIU4i4GgQ 6J9R3QOrL37AV6Q5SpHU4IpDGX6Xygai0GVNmFw= X-Google-Smtp-Source: AIpwx4/iT2hOzKL05BXu0s46EVLsdMP8Cp6eWdK5PHzxK79MI5XLnehIX/G9Ujc/9jKDIzcB0amLPc4S8fK3LbkeXOw= X-Received: by 10.99.104.131 with SMTP id d125mr6224334pgc.9.1522342708591; Thu, 29 Mar 2018 09:58:28 -0700 (PDT) MIME-Version: 1.0 Received: by 10.100.183.67 with HTTP; Thu, 29 Mar 2018 09:58:07 -0700 (PDT) In-Reply-To: References: From: William Herrin Date: Thu, 29 Mar 2018 12:58:07 -0400 X-Gmail-Original-Message-ID: Message-ID: To: Mikael Abrahamsson Cc: Joe Touch , tcpm@ietf.org Content-Type: text/plain; charset="UTF-8" X-Spam-Checker: magic.dirtside.com Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 16:58:43 -0000 On Thu, Mar 29, 2018 at 11:31 AM, Mikael Abrahamsson wrote: > On Thu, 29 Mar 2018, William Herrin wrote: >> It's also fair to wonder why router and firewall vendors don't offer >> configurations designed to mitigate the PMTUD black hole problem. Firewall >> vendors could warn on attempts to block ICMP or require explicit overrides >> to block ICMP destination unreachable messages. Router vendors could offer a >> configuration option to issue ICMP destination unreachables from the a >> configured public IP address rather than from the interface's (sometimes >> private) IP address. They don't do these things. > > These are some reasons for PMTUD blackhole, but far from all. Some are > caused by anycast configurations where the ICMP packet simply doesn't make > it to the node that needs it. Load balancers doing the wrong thing. Hi Mikael, Load balancers doing the wrong thing seems to me like some combination of implementation error and configuration error. How would PLPMTUD detect a path MTU black hole for DNS response packets from an anycasted node? It's fire and forget; the server is not expecting another packet from the querent. Where something more complicated is done with anycast such as TCP without suitable modifications (e.g. https://bill.herrin.us/network/anycasttcp.html) then they've already accepted that a portion of their prospective users will be unreachable. I have no sympathy when folks decide to intentionally implement breakage because it will, statistically, only be broken some of the time. You make an interesting point here about icmp unreachables in the TCP anycast scenario that I haven't accounted for in that paper. I'll have to think that through. > My take on this is that operators should do the right thing (make PMTUD > work), and protocols should handle when things go wrong. Operators "should" have the tools which: A) make it practical to make PMTUD work in all commonly deployed architectures and B) do a respectable job preventing "design induced operator error" with respect to PMTUD. Currently shipping routers and firewalls mostly fail both criteria. > I have very little problem with TCP using an extremely stupid algorithm as > in "I'll use PMTUD, but if it doesn't work I'm going to try 576/1280, and if > that works I sometimes go back to PMTUD value to see if things have > improved". This still means it'll work, somewhat. I have no problem with falling back after a smart enough delay/retry cycle concludes a very high probability a PMTUD black hole. I have little problem with those connections suffering the performance hit of small packets for the duration. I have a bigger problem if routine packet loss or a brief path outage gets commonly misdetected as a PMTUD black hole. I worry most that allowing the algorithm to the hunt for the MTU will justify allowing a higher false positive rate for black hole detection so that everybody suffers a performance hit even when there are no black holes. There are no obvious ways to implement that hunt which don't harm performance. I'd rather see it fall back and stay back with an OS tunable for how confident it has to be of a black hole before it falls back. Regards, Bill Herrin -- William Herrin ................ herrin@dirtside.com bill@herrin.us Dirtside Systems ......... Web: From nobody Thu Mar 29 10:48:51 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 54BF8127419 for ; Thu, 29 Mar 2018 10:48:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.71 X-Spam-Level: X-Spam-Status: No, score=-2.71 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1W3u7XNk-a5c for ; Thu, 29 Mar 2018 10:48:47 -0700 (PDT) Received: from mail-io0-x233.google.com (mail-io0-x233.google.com [IPv6:2607:f8b0:4001:c06::233]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1D8D0124235 for ; Thu, 29 Mar 2018 10:48:47 -0700 (PDT) Received: by mail-io0-x233.google.com with SMTP id q80so8570705ioi.13 for ; Thu, 29 Mar 2018 10:48:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=B5vxpU69xuCPVl56Uf89/diA6TONS5YHn355FpLNgn4=; b=Yfamhba+1aU6U9KFqu17yTxc0VvQFFpNGg+FjV05vhTyDIetxTRWUgZVFkspR+Y/uX kM4eC3RYZIYYLzM/t6rym5a7NBRLf7RFMxJsBECw8jgKQ3NlhH+vO88o78Slcfgzfh7v NKF7+Dm7Fo6Tp/kVuygGYY8q/sgoag4kWly7N5ELsAnUfbiir2XowyAIiuucUOU/j2Hf 9cXTEj8fzXkmYbn37LHWFre9yft2EY6JUThzu+HkrD/Qxmnj5mjIFsxU60e75OtGQNob hBmJJr6nV2Aj/Osy9ipfoSkAU1cnftHGZidyAKYGuQurY8/iTNyBFXyXAwc4O/NmtPoS XywQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=B5vxpU69xuCPVl56Uf89/diA6TONS5YHn355FpLNgn4=; b=jH4SppAjzPwI5Wo5wkQdXPVOeN+YR2R9TAPEtiZvla6T09zdVTdEkbK9k6QOPT+xmf TGGlS32cOmy9RyMIOekXZ1HTV8qfMq0ZC9wUA9rU4/5upba2thrdCnM3IfL+kAmNZX3a 1wGIAyFkEaA6iX1OprnBhntByO3mDs4kEB6OWVIKlvijCcuWE3I5FQzEyQiW94vPILZP 16pTeClz2x2e2x8PFxWAx45/8ymhnbqX9Xe3/ENxZECE7Zcxqrs5aAB6/CEZ4ff4BOcb xVBq1NJjySHGzUfZdUNYr1SVmd85dvB1cCw4rdxFZhM5BpGTjvvUG0wgUjb9N1FJVMKa NrWQ== X-Gm-Message-State: AElRT7HzvrWBRapMDEFJ+aYU75II30xdakQeJU63kAwp3d81ekSB5bA0 1G5NZClakR8vlWYZhxsWY3gDlepO3dwlGYxrzVYx7RY0 X-Google-Smtp-Source: AG47ELtsVG9OqRbSvl2qzN+MtpT9ccUrjY6fx+XHtCL/oaGixuQ2kheT3PAXIz0N4091jZFqSdRaX85a5BxooDxQWI8= X-Received: by 10.107.7.212 with SMTP id g81mr42800519ioi.271.1522345725859; Thu, 29 Mar 2018 10:48:45 -0700 (PDT) MIME-Version: 1.0 Received: by 10.107.138.29 with HTTP; Thu, 29 Mar 2018 10:48:04 -0700 (PDT) In-Reply-To: <981805D3-4F0F-4C99-93D3-C650D640EA9A@ifi.uio.no> References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <1c5bef94-eb4f-7aab-0b6b-cb2d02da7a9a@bobbriscoe.net> <6a451b96-af61-f5c8-87a9-9968e99027de@bobbriscoe.net> <1b5f83b1-d38c-d18c-b259-9817ae8f226c@bobbriscoe.net> <1D6E4D94-643D-497F-87E5-D4F8C72EA639@ifi.uio.no> <981805D3-4F0F-4C99-93D3-C650D640EA9A@ifi.uio.no> From: Yuchung Cheng Date: Thu, 29 Mar 2018 10:48:04 -0700 Message-ID: To: Michael Welzl Cc: Bob Briscoe , tcpm IETF list , Matt Mathis , draft-ietf-tcpm-rack@tools.ietf.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 17:48:49 -0000 Bob Matt Michael Praveen, I agree most of your points, and will include the excellent texts you suggested. Here is authors' big plan 1. A new whole big section on the design rationale on reordering handling in RACK. The current draft is missing or fragmenting this. 2. Exactly document how reordering is and will be detected (instead of citing another draft). There are caveats in those mechanisms too. Details: a. reo_wnd max. SHOULD or MUST. IMO reo_wnd MUST be bounded but the actual value is RECOMMENDED to be X. X is TBD. b. rwnd limit. I have to think through this. rwin-limit is very common during high reordering due to how rwin autotuning is implemented. restricting reo_wnd (to allow more spurious rtx) during rwin-limit seems an adverse move. but I do get your points about potential latency risk. On Thu, Mar 29, 2018 at 4:44 AM, Michael Welzl wrote: > >> On Mar 29, 2018, at 1:42 PM, Michael Welzl wrote: >> >> Hi all, >> >> I was just about to propose a socket option for the upper limit on reord= ering (e.g. as a function of the RTT) - to convey whether an application is= latency-critical or not. However, some of what Bob wrote below throws me o= ff=E2=80=A6 I keep only the relevant bits and reordering them slightly for = better context: > > First, that was a typo - should be =E2=80=9Creorder=E2=80=9D. Second, I a= lmost missed the irony of this=E2=80=A6 making things *more* understandable= by reordering... > > Cheers, > Michael > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm From nobody Thu Mar 29 10:49:36 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6842B124235 for ; Thu, 29 Mar 2018 10:49:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.96 X-Spam-Level: X-Spam-Status: No, score=-3.96 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GGJscjY4tvGr for ; Thu, 29 Mar 2018 10:49:31 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E5ECA12E044 for ; Thu, 29 Mar 2018 10:49:25 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [131.188.34.77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 2FEFC58C516; Thu, 29 Mar 2018 19:49:21 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 190E3B0DE85; Thu, 29 Mar 2018 19:49:21 +0200 (CEST) Date: Thu, 29 Mar 2018 19:49:20 +0200 From: Toerless Eckert To: William Herrin Cc: Mikael Abrahamsson , tcpm@ietf.org, Joe Touch Message-ID: <20180329174920.GV30215@faui40p.informatik.uni-erlangen.de> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 17:49:34 -0000 So, whats the summary ? Write rfc4821bis with recommendations for an additional, simplified procedure dropping to 1280/576 and use most simple upspeeding option ? Because 10 years have shown full rfc4821 is not widely supported in host stack because its too complex ? Another, potentially complementary option is to do an rfc3542bis or some small "highly reliable socket" BCP recommendation for apps requring highest reliability to use 1280/576 MTU through appropriate socket API calls. Could be done n TAPS ? In any case, it would be good to document the broken cases Mikael mentions as well as the difficulties getting complex host stack workarounds implemented broadly - otherwise it will be hard to persuade the MTU/performance part of the community of any such recommendations. Cheers toerless On Thu, Mar 29, 2018 at 12:58:07PM -0400, William Herrin wrote: > On Thu, Mar 29, 2018 at 11:31 AM, Mikael Abrahamsson wrote: > > On Thu, 29 Mar 2018, William Herrin wrote: > >> It's also fair to wonder why router and firewall vendors don't offer > >> configurations designed to mitigate the PMTUD black hole problem. Firewall > >> vendors could warn on attempts to block ICMP or require explicit overrides > >> to block ICMP destination unreachable messages. Router vendors could offer a > >> configuration option to issue ICMP destination unreachables from the a > >> configured public IP address rather than from the interface's (sometimes > >> private) IP address. They don't do these things. > > > > These are some reasons for PMTUD blackhole, but far from all. Some are > > caused by anycast configurations where the ICMP packet simply doesn't make > > it to the node that needs it. Load balancers doing the wrong thing. > > Hi Mikael, > > Load balancers doing the wrong thing seems to me like some combination > of implementation error and configuration error. > > How would PLPMTUD detect a path MTU black hole for DNS response > packets from an anycasted node? It's fire and forget; the server is > not expecting another packet from the querent. > > Where something more complicated is done with anycast such as TCP > without suitable modifications (e.g. > https://bill.herrin.us/network/anycasttcp.html) then they've already > accepted that a portion of their prospective users will be > unreachable. I have no sympathy when folks decide to intentionally > implement breakage because it will, statistically, only be broken some > of the time. > > You make an interesting point here about icmp unreachables in the TCP > anycast scenario that I haven't accounted for in that paper. I'll have > to think that through. > > > > My take on this is that operators should do the right thing (make PMTUD > > work), and protocols should handle when things go wrong. > > Operators "should" have the tools which: > > A) make it practical to make PMTUD work in all commonly deployed > architectures and > > B) do a respectable job preventing "design induced operator error" > with respect to PMTUD. > > Currently shipping routers and firewalls mostly fail both criteria. > > > > I have very little problem with TCP using an extremely stupid algorithm as > > in "I'll use PMTUD, but if it doesn't work I'm going to try 576/1280, and if > > that works I sometimes go back to PMTUD value to see if things have > > improved". This still means it'll work, somewhat. > > I have no problem with falling back after a smart enough delay/retry > cycle concludes a very high probability a PMTUD black hole. I have > little problem with those connections suffering the performance hit of > small packets for the duration. I have a bigger problem if routine > packet loss or a brief path outage gets commonly misdetected as a > PMTUD black hole. I worry most that allowing the algorithm to the hunt > for the MTU will justify allowing a higher false positive rate for > black hole detection so that everybody suffers a performance hit even > when there are no black holes. There are no obvious ways to implement > that hunt which don't harm performance. I'd rather see it fall back > and stay back with an OS tunable for how confident it has to be of a > black hole before it falls back. > > Regards, > Bill Herrin > > > > -- > William Herrin ................ herrin@dirtside.com bill@herrin.us > Dirtside Systems ......... Web: > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm -- --- tte@cs.fau.de From nobody Thu Mar 29 13:41:13 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1284812DA42 for ; Thu, 29 Mar 2018 13:41:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.31 X-Spam-Level: X-Spam-Status: No, score=-4.31 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=swm.pp.se Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id W8v8OPLjdyHr for ; Thu, 29 Mar 2018 13:41:09 -0700 (PDT) Received: from uplift.swm.pp.se (ipv6.swm.pp.se [IPv6:2a00:801::f]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1D2B112741D for ; Thu, 29 Mar 2018 13:41:09 -0700 (PDT) Received: by uplift.swm.pp.se (Postfix, from userid 501) id 9FB59AF; Thu, 29 Mar 2018 22:41:06 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=swm.pp.se; s=mail; t=1522356066; bh=AWAimcmjE3mi/1BgjFFoLw1dgig0SC7EZG8lUH3/AzE=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=oxEP7NDPf6deRzfGog3i21Pc3FM9Nv3IQL4tSRR7wAbH/6HxE1FQTtUMnglPxACbE WMjm+WHtV6y+Mmk899rQ1uKTvlq94f8mF+XhIK+8P4pIGpphCe8+4MPiQbrsta+OGd 4LUZ1selvC02g0J1DuCdPSLka8O82aa2SawnV+kQ= Received: from localhost (localhost [127.0.0.1]) by uplift.swm.pp.se (Postfix) with ESMTP id 9DA4A9F; Thu, 29 Mar 2018 22:41:06 +0200 (CEST) Date: Thu, 29 Mar 2018 22:41:06 +0200 (CEST) From: Mikael Abrahamsson To: William Herrin cc: Joe Touch , tcpm@ietf.org In-Reply-To: Message-ID: References: User-Agent: Alpine 2.20 (DEB 67 2015-01-07) Organization: People's Front Against WWW MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 20:41:12 -0000 On Thu, 29 Mar 2018, William Herrin wrote: > How would PLPMTUD detect a path MTU black hole for DNS response packets > from an anycasted node? It's fire and forget; the server is not > expecting another packet from the querent. Then the resolver needs to ask again, but make sure that the response is small enough. This is up to the protocol implementer to figure out. If the protocol implementer wants stateless unicast to work as a deployment scenario, then they need to design the protocol for PLPMTUD to work. > I have no problem with falling back after a smart enough delay/retry > cycle concludes a very high probability a PMTUD black hole. I have > little problem with those connections suffering the performance hit of > small packets for the duration. I have a bigger problem if routine > packet loss or a brief path outage gets commonly misdetected as a PMTUD > black hole. I worry most that allowing the algorithm to the hunt for the > MTU will justify allowing a higher false positive rate for black hole > detection so that everybody suffers a performance hit even when there > are no black holes. There are no obvious ways to implement that hunt > which don't harm performance. I'd rather see it fall back and stay back > with an OS tunable for how confident it has to be of a black hole before > it falls back. I am perfectly fine with the PMTUD blackhole algorithm kicking in after 5 seconds of complete loss and TCP going back to slow start. I do not care much if performance is really bad when there is a PMTUD blackhole. What I want to avoid is that things don't work at all. Abysmal performance is better than things not working at all (which is often the case right now). Also, if PMTUD blackhole detect kicks in, I'd like to be able to diagnose it with counters or logs from the TCP stack, telling me that this is going on. -- Mikael Abrahamsson email: swmike@swm.pp.se From nobody Thu Mar 29 13:51:44 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C04CC1250B8 for ; Thu, 29 Mar 2018 13:51:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.989 X-Spam-Level: X-Spam-Status: No, score=-1.989 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_SPF_PERMERROR=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zilJg-b5G1S9 for ; Thu, 29 Mar 2018 13:51:32 -0700 (PDT) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4F96212E6A3 for ; Thu, 29 Mar 2018 13:51:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=Message-ID:References:In-Reply-To:Subject:Cc: To:From:Date:Content-Transfer-Encoding:Content-Type:MIME-Version:Sender: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=qphH9M4Qw+zcowHZPzIY1+Ys7qxAdrsieinZztHqVbg=; b=VUj5ZDFexVc1z2PkNdYzGENuTr TfGcC1Rv0j+vzvWgIGYIm2VB1/G0PltiIcNv9ippHamKUFFdZTFx1qpyxPnyTmYfCfYkcLwYBzZkr N1FnMLq6TMfJHipQ4k/ULV4h7RwDdIJjTUlnrNy0god3x3UMJHdaezz3zASOWFArzm8vBYTvCzIRn 0BxXZ3IXu73NWQQGbk1cVmi1S4ANL8KsS9kQGibUtWip9toDbfHDHvW07zv7jkW2xddnaEoMwbcQZ P5r6jPxzOCb5XzO+k1YmeSe+Ff63IM79iu1lsnpoJmu+ydEeFVvh4YG+X0TiD2N6esD+rO0LRZebp EPd3zH3Q==; Received: from [::1] (port=51056 helo=webmail.strayalpha.com) by server217.web-hosting.com with esmtpa (Exim 4.89_1) (envelope-from ) id 1f1eVz-001WGR-VJ; Thu, 29 Mar 2018 16:51:20 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Thu, 29 Mar 2018 16:51:19 -0400 From: touch@strayalpha.com To: William Herrin Cc: Mikael Abrahamsson , tcpm@ietf.org In-Reply-To: References: Message-ID: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> X-Sender: touch@strayalpha.com User-Agent: Roundcube Webmail/1.2.7 X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 20:51:39 -0000 On 2018-03-29 11:02, William Herrin wrote: > On Thu, Mar 29, 2018 at 9:32 AM, Joe Touch > wrote: >>> On Mar 28, 2018, at 8:51 AM, Mikael Abrahamsson >>> wrote: >>> So I have no idea how to come to a best conclusion regarding the >>> tradeoff between "doesn't work at all" and "doesn't work optimally in >>> some cases". >> >> If making things more optimal in some cases causes some things to >> fail, you have chosen poorly. > > Hi Joe, > > Status quo is "doesn't work at all," the PMTUD black hole problem. Agreed. I was speaking more to the general principle - we need to find something that helps work as much of the time as possible *first*, and worry about optimizing later (or perhaps not as much at all). > PMTUD is arguably a design defect in IP: one of few cases in which the > end to end principle is abandoned, requiring the intermediate router > to communicate with an endpoint or else end to end communication > fails. Even E2E it wouldn't necessarily work. There are two issues at play here, both of which work against PMTUD: 1) in-band vs. out-of-band signaling Relying on ICMPs to fix an issue with TCP might not work because the two protocols don't "fate share" (e.g., it's possible to block one and not the other) 2) active vs. passive feedback PMTUD works only with active feedback (the presence of feedback signals). PLPMTUD allows for passive feedback (i.e., the lack of feedback ensures recovery). The fact that PMTUD also relies on participation of parties other than the receiving endpoint makes things worse, but it isn't the only problem. I agree that problems with PLPMTUD implementation should be documented and hopefully fixed - either by revising the spec or fixing the implementations. It would be nice if we could start to rely on it rather than suffering from the consequences of PMTUD breakage. And I don't care much *why* ICMPs are blocked, dropped, or never reach the source - i.e., whether this is operator misconfiguration, deliberate configuration, problems with NAT translation, or problems with tunnel ingress relay back to the source. The result is the same, and I don't think we can expect any of that to get better. Joe From nobody Thu Mar 29 14:03:29 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 69D6912DA07 for ; Thu, 29 Mar 2018 14:03:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.989 X-Spam-Level: X-Spam-Status: No, score=-1.989 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, T_SPF_PERMERROR=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Dx43IZaaCySV for ; Thu, 29 Mar 2018 14:03:26 -0700 (PDT) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 51AB412D958 for ; Thu, 29 Mar 2018 14:03:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=Message-ID:References:In-Reply-To:Subject:Cc: To:From:Date:Content-Type:MIME-Version:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=L544n6PPAzbAummbBtwKgNTH0C5OXulzl/bT7gfAtkY=; b=s5pIwpQCeXIZpkByOOlUe1DOc OERqUmnngHHrO60kUat2jMEdZJUutsjUkLvL45mb74HFy8Vz9puXZQLwteM6zw+qT0TcICXq9xquo 47T1UueDMrbLrVlGvqYYieJ0roM14yNGbRMoKsBdftVbJm5rTrDyXK9UxMGhcFqadCEayEjRBSDAa tqfPqQkXT5AuKQBN5eQ2TRCe32U2jXKKrukpFtBg53SVp+5Ex5SXcReW2WCVdgs9eUpmszJV25ZXz ql3dQEGb5fELRoFF/z+p7HqytgePU8DzhXrAKl8yke4wFiK7St21i2nRoGqDl+4LP2/rwJrI+/J9M 5VH1aZlUQ==; Received: from [::1] (port=40342 helo=webmail.strayalpha.com) by server217.web-hosting.com with esmtpa (Exim 4.89_1) (envelope-from ) id 1f1ehL-001h1n-8W; Thu, 29 Mar 2018 17:03:03 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="=_0fce79cf9ebce3693d2d1ba392f5475c" Date: Thu, 29 Mar 2018 17:03:03 -0400 From: touch@strayalpha.com To: Bob Briscoe Cc: Matt Mathis , tcpm IETF list , draft-ietf-tcpm-rack@tools.ietf.org In-Reply-To: <1b5f83b1-d38c-d18c-b259-9817ae8f226c@bobbriscoe.net> References: <152029151070.12715.15497200993114582811@ietfa.amsl.com> <1c5bef94-eb4f-7aab-0b6b-cb2d02da7a9a@bobbriscoe.net> <6a451b96-af61-f5c8-87a9-9968e99027de@bobbriscoe.net> <1b5f83b1-d38c-d18c-b259-9817ae8f226c@bobbriscoe.net> Message-ID: <81ed3238df145d3beeb5b5bfc29af1c1@strayalpha.com> X-Sender: touch@strayalpha.com User-Agent: Roundcube Webmail/1.2.7 X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] Vicious or Virtuous circle? Adapting reordering window to reordering degree X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 21:03:28 -0000 --=_0fce79cf9ebce3693d2d1ba392f5475c Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII Hi, all, Setting the receive window is exactly the way to control both reordering and loss recovery capability. The two can't be decoupled because they're basically the same thing - loss is just reordering that hasn't happened yet. Because they're coupled and because loss is more likely to drive the larger receive window value (i.e., multiple RTTs to allow for retransmission), what is the point in trying to limit receiver reordering otherwise? As others have noted, IMO the goal here ought to be to figure out how to make TCP less impacted by reordering - not to try to engineer the network to do otherwise. Bob also noted: > {Note 1}: There are other ways to remove losses, e.g. FEC, ECN. In an > ideal world, if they were 100% successfully employed, there would be > no trade off - increasing reordering tolerance would be wholly > beneficial. Not to those who care about latency, not to mention that the increased latency then drives larger RWIN too. In-network reordering trades ordering for delay, which is the wrong trade-off when delay is more important OR when downstream re-reordering is possible. Joe --=_0fce79cf9ebce3693d2d1ba392f5475c Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=UTF-8
= Hi, all,
=  
= Setting the receive window is exactly the way to control both reordering an= d loss recovery capability. The two can't be decoupled because they're basi= cally the same thing - loss is just reordering that hasn't happened yet.
=  
= Because they're coupled and because loss is more likely to drive the larger= receive window value (i.e., multiple RTTs to allow for retransmission), wh= at is the point in trying to limit receiver reordering otherwise?
=  
= As others have noted, IMO the goal here ought to be to figure out how to ma= ke TCP less impacted by reordering - not to try to engineer the network to = do otherwise.
=  
= Bob also noted:
{Note 1}: There are other ways to remove losses, e.g= =2E FEC, ECN. In an
ideal world, if they were 100% successfully emplo= yed, there would be
no trade off - increasing reordering tolerance wo= uld be wholly
beneficial.
= Not to those who care about latency, not to mention that the increased late= ncy then drives larger RWIN too.
=  
= In-network reordering trades ordering for delay, which is the wrong trade-o= ff when delay is more important OR when downstream re-reordering is possibl= e.
=  
= Joe
--=_0fce79cf9ebce3693d2d1ba392f5475c-- From nobody Thu Mar 29 22:38:37 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9C5B812D775 for ; Thu, 29 Mar 2018 22:38:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.311 X-Spam-Level: X-Spam-Status: No, score=-4.311 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=swm.pp.se Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cC85rjCZQy_w for ; Thu, 29 Mar 2018 22:38:34 -0700 (PDT) Received: from uplift.swm.pp.se (ipv6.swm.pp.se [IPv6:2a00:801::f]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 700AB124B0A for ; Thu, 29 Mar 2018 22:38:34 -0700 (PDT) Received: by uplift.swm.pp.se (Postfix, from userid 501) id E4B08AF; Fri, 30 Mar 2018 07:38:31 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=swm.pp.se; s=mail; t=1522388311; bh=C3TZVNXSZxb8XN6nheg0TjxDGF0b083+IIpwRy4D1K4=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=eSWZUwNLUGxrXZNVUVRFZdBW5k0F+cz4sxDgXG0wDHqMA4ouQ2Xh4DCqmw5iw/YKH blU6Nty60jl229E3DJ5GyBUoQITSBiF7gQq+89ee3spqN+kLwhQcIIp6Mco/HiVO/j ATWX0vGsSqNeCa+Y4LLEI0uOP/5lAQ1rsr03B9ZM= Received: from localhost (localhost [127.0.0.1]) by uplift.swm.pp.se (Postfix) with ESMTP id E10BF9F; Fri, 30 Mar 2018 07:38:31 +0200 (CEST) Date: Fri, 30 Mar 2018 07:38:31 +0200 (CEST) From: Mikael Abrahamsson To: touch@strayalpha.com cc: William Herrin , tcpm@ietf.org In-Reply-To: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> Message-ID: References: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) Organization: People's Front Against WWW MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 05:38:36 -0000 On Thu, 29 Mar 2018, touch@strayalpha.com wrote: > And I don't care much *why* ICMPs are blocked, dropped, or never reach > the source - i.e., whether this is operator misconfiguration, deliberate > configuration, problems with NAT translation, or problems with tunnel > ingress relay back to the source. The result is the same, and I don't > think we can expect any of that to get better. Agreed. Things go wrong, and protocols need to handle this fact. I don't really care how they handle it, and I'm ok with performance being severely reduced in this "limp mode" (the equivalent of a internal combustion engine mode where it still runs but at a severely reduced performance level, just so you can safely get yourself to a mechanic). Once we have this limp mode, then people can think of how to optimize this, if they so want. There are smart people here, I've already seen proposals that look like they are worthwhile pursuing, but I would really like to get in place a very straight forward solution for the "this will not work at all"-case, where in TCPs case it seems to me that this is 5-8 seconds of total loss, back in slow-start, nothing is working. We can then have probing back to (larger) PMTUD packet sizes after some time. Frankly, I don't much mind if this TCP session goes back to this painfully bad state every 30 seconds to re-probe the PMTUD value, at least it'll not be completely broken. I just want this default-on in all major TCP stacks, in the next few years. The simpler, the better and the higher chance that it'll get adopted, right? -- Mikael Abrahamsson email: swmike@swm.pp.se From nobody Thu Mar 29 22:46:41 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 510A012D775 for ; Thu, 29 Mar 2018 22:46:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.99 X-Spam-Level: X-Spam-Status: No, score=-1.99 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_SPF_PERMERROR=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Mh93zzmBlXrF for ; Thu, 29 Mar 2018 22:46:38 -0700 (PDT) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 05620124B0A for ; Thu, 29 Mar 2018 22:46:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To:Subject:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=ykqRwJY7Oui0z9SirbvKqESQBTrirJuY4otzYl1tZ5U=; b=xkqh+/vNWaKGGikDS2vfzPmnk9 IoYi3zrXtBV9PmNMGLjfvdTX3y0rlwRIEXKpGu+bF63Tt0yVUabYHQv7CKCXVsEatXjwF/N124+cP zXlTD1/CtioM3p8shzfD0rjqFemFwFtwvLSQhcltkC6VdzcV6gX757jmQ6ScoQ2ofEsAsF7C3dO7W V41DInBGiiJEDEcmb1if9ALOdS3ix8THxT+MmgPdxrFQLy5dHyCBhxV5PuODjqfxJWox6+Km/Om7r G2g4re9BbuctjHdiim12y+W1ENl0PxUJrR2PM8pdzkWkco0t42Bn+BB1jnLkJCmikztY6CT61VzPJ ieekR6MA==; Received: from cpe-172-250-240-132.socal.res.rr.com ([172.250.240.132]:50273 helo=[192.168.1.189]) by server217.web-hosting.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89_1) (envelope-from ) id 1f1mrp-001Wl1-Qv; Fri, 30 Mar 2018 01:46:26 -0400 To: Mikael Abrahamsson Cc: William Herrin , tcpm@ietf.org References: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> From: Joe Touch Message-ID: <572210fa-74ae-0edf-ce10-d66153ae80a3@strayalpha.com> Date: Thu, 29 Mar 2018 22:46:14 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 05:46:40 -0000 On 3/29/2018 10:38 PM, Mikael Abrahamsson wrote: > ...Frankly, I don't much mind if this TCP session goes back to this > painfully bad state every 30 seconds to re-probe the PMTUD value, at > least it'll not be completely broken. > > I just want this default-on in all major TCP stacks, in the next few > years. The simpler, the better and the higher chance that it'll get > adopted, right? It would be useful to be careful. I'd rather see a TCP that runs just fine (but maybe not as fast as you think it should) with 400 byte packets than one that keeps bashing its head against a rock trying to find the "best" larger packet size, failing, and "limping" along that way continually. Joe From nobody Thu Mar 29 23:20:08 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 51BA212D778 for ; Thu, 29 Mar 2018 23:20:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.311 X-Spam-Level: X-Spam-Status: No, score=-4.311 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=swm.pp.se Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OwywZu_20tN2 for ; Thu, 29 Mar 2018 23:20:05 -0700 (PDT) Received: from uplift.swm.pp.se (ipv6.swm.pp.se [IPv6:2a00:801::f]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E0D5012D777 for ; Thu, 29 Mar 2018 23:20:04 -0700 (PDT) Received: by uplift.swm.pp.se (Postfix, from userid 501) id 88B18AF; Fri, 30 Mar 2018 08:20:01 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=swm.pp.se; s=mail; t=1522390801; bh=RpVizH2kIfsN18A+UXnQ/dQY/j0PA6Pk+SmPbYC2res=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=LzPJcluh1AZ2mpJ0WVIH+Z4J2fQawSL4Bl5vccGFWcGUEnnLe11fM3tN9LAlk/h3P VM96wv++yJ/xpQ+eAB5f2XJl52UOD2uxWQBDL3Gt/y2mB7zunAc4DoPGMCoDg47t5/ pNNI0o3QbwFc5mi0tzRx5pAouPH3YhjO9R6rGsuY= Received: from localhost (localhost [127.0.0.1]) by uplift.swm.pp.se (Postfix) with ESMTP id 7F54E9F; Fri, 30 Mar 2018 08:20:01 +0200 (CEST) Date: Fri, 30 Mar 2018 08:20:01 +0200 (CEST) From: Mikael Abrahamsson To: Joe Touch cc: William Herrin , tcpm@ietf.org In-Reply-To: <572210fa-74ae-0edf-ce10-d66153ae80a3@strayalpha.com> Message-ID: References: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> <572210fa-74ae-0edf-ce10-d66153ae80a3@strayalpha.com> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) Organization: People's Front Against WWW MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 06:20:06 -0000 On Thu, 29 Mar 2018, Joe Touch wrote: > It would be useful to be careful. I'd rather see a TCP that runs just > fine (but maybe not as fast as you think it should) with 400 byte > packets than one that keeps bashing its head against a rock trying to > find the "best" larger packet size, failing, and "limping" along that > way continually. I have no fundamental objections to this. The only question I guess needs to be answered is if there is an 10 second 100% packet loss outage situation, will all my TCP sessions now be in limp mode after that? Because I imagine that if TCP now went into slow-start and that 576/1280 byte packet happened to make it through when the network started working again, would the implementation deduce that the outage was caused by PMTUD blackhole, and keep itself in limp mode? -- Mikael Abrahamsson email: swmike@swm.pp.se From nobody Fri Mar 30 00:24:03 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B64BD124BAC for ; Fri, 30 Mar 2018 00:24:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.91 X-Spam-Level: X-Spam-Status: No, score=-1.91 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oo1ZdUAjx_mO for ; Fri, 30 Mar 2018 00:23:59 -0700 (PDT) Received: from pegasus.erg.abdn.ac.uk (pegasus.erg.abdn.ac.uk [IPv6:2001:630:241:204::f0f0]) by ietfa.amsl.com (Postfix) with ESMTP id EA92D1205D3 for ; Fri, 30 Mar 2018 00:23:58 -0700 (PDT) Received: from Gs-MacBook-Pro.local (fgrpf.plus.com [212.159.18.54]) by pegasus.erg.abdn.ac.uk (Postfix) with ESMTPA id 756651B001D2; Fri, 30 Mar 2018 08:23:24 +0100 (BST) Message-ID: <5ABDE5ED.7060508@erg.abdn.ac.uk> Date: Fri, 30 Mar 2018 08:23:25 +0100 From: Gorry Fairhurst Reply-To: gorry@erg.abdn.ac.uk Organization: University of Aberdeen User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: Mikael Abrahamsson CC: Joe Touch , tcpm@ietf.org References: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> <572210fa-74ae-0edf-ce10-d66153ae80a3@strayalpha.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 07:24:02 -0000 On 30/03/2018, 07:20, Mikael Abrahamsson wrote: > On Thu, 29 Mar 2018, Joe Touch wrote: > >> It would be useful to be careful. I'd rather see a TCP that runs just >> fine (but maybe not as fast as you think it should) with 400 byte >> packets than one that keeps bashing its head against a rock trying to >> find the "best" larger packet size, failing, and "limping" along that >> way continually. > > I have no fundamental objections to this. The only question I guess > needs to be answered is if there is an 10 second 100% packet loss > outage situation, will all my TCP sessions now be in limp mode after > that? > > Because I imagine that if TCP now went into slow-start and that > 576/1280 byte packet happened to make it through when the network > started working again, would the implementation deduce that the outage > was caused by PMTUD blackhole, and keep itself in limp mode? > Just to be sure, the email thread was entitled PLPMTUD, and yet it talks about PMTU blakcholes. PL-PMTUD doesn't rely on ICMP messages to detect the PMTU. Sure, a transport using PLPMTUD can use these messages as a PART of the input to finding a PMTU, but it can also ignore them (e.g., when it can not verify that they apply to the node, or discovers that the reported MTU is not appropriate). If you're adding PLPMTUD to TCP you need to work out how to handle probing using TCP segments and also whether/how to utlise the ICMP messages - this does not need to lead to a "limp" mode, as in ICMP black-hole detection. Gorry From nobody Fri Mar 30 01:04:58 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E623D126C83 for ; Fri, 30 Mar 2018 01:04:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.311 X-Spam-Level: X-Spam-Status: No, score=-4.311 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=swm.pp.se Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wY1hgAjmzx9D for ; Fri, 30 Mar 2018 01:04:43 -0700 (PDT) Received: from uplift.swm.pp.se (ipv6.swm.pp.se [IPv6:2a00:801::f]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DC88B12E87D for ; Fri, 30 Mar 2018 01:04:41 -0700 (PDT) Received: by uplift.swm.pp.se (Postfix, from userid 501) id ED8C1B1; Fri, 30 Mar 2018 10:04:38 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=swm.pp.se; s=mail; t=1522397078; bh=aADuu9rofNpVBGTwycgw3zXhS2sZ99jHneN9rv0XLmA=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=LfTvQcKVEvPj/3Vx+kRIPEnNMJ1v/R/wssGMqPp/44+gF45jbMf0d1T0NJDn0ZxXc gWC4pUmOI/QFrPusyycglI7eC1dTIudyfMuAs+wgTZ2OIfXwoJcKBt0e17up7bS7qd s5JpuN26D/UnMCoSW98LExPwBKnMEIeTilz4Bv7s= Received: from localhost (localhost [127.0.0.1]) by uplift.swm.pp.se (Postfix) with ESMTP id EB2DAB0; Fri, 30 Mar 2018 10:04:38 +0200 (CEST) Date: Fri, 30 Mar 2018 10:04:38 +0200 (CEST) From: Mikael Abrahamsson To: Gorry Fairhurst cc: Joe Touch , tcpm@ietf.org In-Reply-To: <5ABDE5ED.7060508@erg.abdn.ac.uk> Message-ID: References: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> <572210fa-74ae-0edf-ce10-d66153ae80a3@strayalpha.com> <5ABDE5ED.7060508@erg.abdn.ac.uk> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) Organization: People's Front Against WWW MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 08:04:55 -0000 On Fri, 30 Mar 2018, Gorry Fairhurst wrote: > Just to be sure, the email thread was entitled PLPMTUD, and yet it talks > about PMTU blakcholes. I believe these are closely related. A PMTU blackhole detection algorithm, needs to do some PLPMTUD. It can be extremely stupid and simple, and just try a few packet sizes. Falling back to IPv4 68 byte minimum MTU would probably be too stupid. > PL-PMTUD doesn't rely on ICMP messages to detect the PMTU. Sure, a > transport using PLPMTUD can use these messages as a PART of the input to > finding a PMTU, but it can also ignore them (e.g., when it can not > verify that they apply to the node, or discovers that the reported MTU > is not appropriate). If you're adding PLPMTUD to TCP you need to work > out how to handle probing using TCP segments and also whether/how to > utlise the ICMP messages - this does not need to lead to a "limp" mode, > as in ICMP black-hole detection. Agreed. So I want SOMETHING that works around PMTU blackholes, and I want people to deploy it. The smarter and advanced the algorithm, the less chance people will deploy it (it seems, since it's default off everywhere). The fundamental problem I want to solve is PMTU blackhole. I want to solve this by doing PLPMTUD, and I want to discuss how to get this into a default-on state on basically everything shipped, and perhaps even into older versions that receive updates. -- Mikael Abrahamsson email: swmike@swm.pp.se From nobody Fri Mar 30 01:17:52 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9D3A4120727 for ; Fri, 30 Mar 2018 01:17:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.91 X-Spam-Level: X-Spam-Status: No, score=-1.91 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZCWRf_EVQUtH for ; Fri, 30 Mar 2018 01:17:49 -0700 (PDT) Received: from pegasus.erg.abdn.ac.uk (pegasus.erg.abdn.ac.uk [IPv6:2001:630:241:204::f0f0]) by ietfa.amsl.com (Postfix) with ESMTP id 2B48B1200E5 for ; Fri, 30 Mar 2018 01:17:49 -0700 (PDT) Received: from Gs-MacBook-Pro.local (fgrpf.plus.com [212.159.18.54]) by pegasus.erg.abdn.ac.uk (Postfix) with ESMTPA id 738BF1B001D2; Fri, 30 Mar 2018 09:17:14 +0100 (BST) Message-ID: <5ABDF28B.8020402@erg.abdn.ac.uk> Date: Fri, 30 Mar 2018 09:17:15 +0100 From: Gorry Fairhurst Reply-To: gorry@erg.abdn.ac.uk Organization: University of Aberdeen User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: Mikael Abrahamsson CC: Joe Touch , tcpm@ietf.org References: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> <572210fa-74ae-0edf-ce10-d66153ae80a3@strayalpha.com> <5ABDE5ED.7060508@erg.abdn.ac.uk> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 08:17:50 -0000 On 30/03/2018, 09:04, Mikael Abrahamsson wrote: > On Fri, 30 Mar 2018, Gorry Fairhurst wrote: > >> Just to be sure, the email thread was entitled PLPMTUD, and yet it >> talks about PMTU blakcholes. > > I believe these are closely related. A PMTU blackhole detection > algorithm, needs to do some PLPMTUD. It can be extremely stupid and > simple, and just try a few packet sizes. Falling back to IPv4 68 byte > minimum MTU would probably be too stupid. > Yes. I am all for exploring a simple set of packet sizes and considering different algorithms to probe! >> PL-PMTUD doesn't rely on ICMP messages to detect the PMTU. Sure, a >> transport using PLPMTUD can use these messages as a PART of the input >> to finding a PMTU, but it can also ignore them (e.g., when it can not >> verify that they apply to the node, or discovers that the reported >> MTU is not appropriate). If you're adding PLPMTUD to TCP you need to >> work out how to handle probing using TCP segments and also >> whether/how to utlise the ICMP messages - this does not need to lead >> to a "limp" mode, as in ICMP black-hole detection. > > Agreed. So I want SOMETHING that works around PMTU blackholes, and I > want people to deploy it. The smarter and advanced the algorithm, the > less chance people will deploy it (it seems, since it's default off > everywhere). > Then I agree. > The fundamental problem I want to solve is PMTU blackhole. I want to > solve this by doing PLPMTUD, and I want to discuss how to get this > into a default-on state on basically everything shipped, and perhaps > even into older versions that receive updates. > Indeed. I think once I (?) understand the algorithm components it should be possible to provide simple as well as sophisticated combinations - depending onthe goal, and I do hope that at least onw will be simple and easy to implement in TCP. We could also explore whether a simplistic padding approach in Datagram PLPMTUD also is easier to add to a TCP implementation. Gorry From nobody Fri Mar 30 05:45:17 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A3B7312D7F3 for ; Fri, 30 Mar 2018 05:45:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QdwehZ3rfPO5 for ; Fri, 30 Mar 2018 05:45:13 -0700 (PDT) Received: from magic.dirtside.com (magics.dirtside.com [199.33.225.25]) by ietfa.amsl.com (Postfix) with ESMTP id 8CAC5126DFF for ; Fri, 30 Mar 2018 05:45:13 -0700 (PDT) Received: from minoc.dirtside.com (minoc.dirtside.com [70.184.240.82]) by magic.dirtside.com (8.14.3/) with ESMTP id w2UCj8fC027603 for ; Fri, 30 Mar 2018 08:45:08 -0400 X-Really-To: Received: from mail-it0-f43.google.com (mail-it0-f43.google.com [209.85.214.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by minoc.dirtside.com (Postfix) with ESMTPSA id 306DFEBDB2 for ; Fri, 30 Mar 2018 08:45:08 -0400 (EDT) Received: by mail-it0-f43.google.com with SMTP id b5-v6so855996itj.1 for ; Fri, 30 Mar 2018 05:45:08 -0700 (PDT) X-Gm-Message-State: ALQs6tAp1yozXCt4MKSP7s0yBEKB9ZmjPHUEndqqNs3aHQB2WQgTKb1Z 3gZ1D5Cs5sQ9SxsxACsdzEeSAWikv1GakI0fk6g= X-Google-Smtp-Source: AIpwx487v8LTIcsrRz68vFX4GgUeg92MeNXqCSXe+wDWQcPp4n2d0xpJ4R65/59kkrBtE/zmhWQgVjSEfSc7vWCRt9o= X-Received: by 2002:a24:2551:: with SMTP id g78-v6mr2962073itg.76.1522413907524; Fri, 30 Mar 2018 05:45:07 -0700 (PDT) MIME-Version: 1.0 Received: by 10.79.199.205 with HTTP; Fri, 30 Mar 2018 05:44:46 -0700 (PDT) In-Reply-To: <20180329174920.GV30215@faui40p.informatik.uni-erlangen.de> References: <20180329174920.GV30215@faui40p.informatik.uni-erlangen.de> From: William Herrin Date: Fri, 30 Mar 2018 08:44:46 -0400 X-Gmail-Original-Message-ID: Message-ID: To: Toerless Eckert Cc: Mikael Abrahamsson , tcpm@ietf.org, Joe Touch Content-Type: text/plain; charset="UTF-8" X-Spam-Checker: magic.dirtside.com Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 12:45:15 -0000 On Thu, Mar 29, 2018 at 1:49 PM, Toerless Eckert wrote: > So, whats the summary ? Howdy, My thoughts run this direction: 1. Recommend that router implementations "SHOULD" provide the option to generate ICMPv4 type 3 code 4 (fragmentation needed) messages and ICMPv6 type 2 (packet too big) messages from an address different than the source interface address. They Dan't today, creating lots of cases where the operator has to sacrifice PMTUD. 2. Recommend that firewall implementations "SHOULD NOT" filter ICMPv4 type 3 code 4 (fragmentation needed) messages or ICMPv6 type 2 (packet too big) messages unless explicitly configured to do so. In other words, the instruction to filter all ICMP will not result in dropping fragmentation needed messages but the explicit instruction to drop fragmentation needed messages specifically will. Today's firewall tools make it too easy to accidentally kill PMTUD. Let's maximize the chance of PMTUD working as designed and then build something optimized for the residual cases where it still doesn't. > Write rfc4821bis with recommendations for an additional, > simplified procedure dropping to 1280/576 and use most simple upspeeding > option ? That is #3. And I'd like to be smart about fallback at the expense of efficiency in the black hole case. Send the 1280 packet. If it works, send another full size packet to confirm it still fails before accepting 1280 as the path mtu. If the 1280 and 576 packets don't work either, don't try the fallback again: it's not path mtu. Maybe the RFC is already smart about this; I didn't read closely enough. 4. Go back to the ground truths and reconsider whether we have satisfactory information at layer 3 to make reliable decisions about path mtu. Because of the fate sharing issue, I think PMTUD wants to be a layer 4 problem implemented independently in each layer 4 protocol with layer 3 offering hints from ICMP when available. Maybe this is something that should be kicked over to the IRTF for investigation. Regards, Bill Herrin -- William Herrin ................ herrin@dirtside.com bill@herrin.us Dirtside Systems ......... Web: From nobody Fri Mar 30 07:05:06 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 27016127058 for ; Fri, 30 Mar 2018 07:05:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.961 X-Spam-Level: X-Spam-Status: No, score=-3.961 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bu7TO6P5b_OP for ; Fri, 30 Mar 2018 07:05:01 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B47D0126DCA for ; Fri, 30 Mar 2018 07:05:01 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 458F658C4C8; Fri, 30 Mar 2018 16:04:57 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 2DD62B0DE9A; Fri, 30 Mar 2018 16:04:57 +0200 (CEST) Date: Fri, 30 Mar 2018 16:04:57 +0200 From: Toerless Eckert To: William Herrin Cc: Joe Touch , tcpm@ietf.org Message-ID: <20180330140456.GH3590@faui40p.informatik.uni-erlangen.de> References: <20180329174920.GV30215@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 14:05:04 -0000 William, Thanks for making suggestions how the network can behave better, no idea why i am starting to give up on that idea *sigh* This part of the discussion would probably be better on v6ops@ietf.org more inline. On Fri, Mar 30, 2018 at 08:44:46AM -0400, William Herrin wrote: > My thoughts run this direction: > > 1. Recommend that router implementations "SHOULD" provide the option > to generate ICMPv4 type 3 code 4 (fragmentation needed) messages and > ICMPv6 type 2 (packet too big) messages from an address different than > the source interface address. They Dan't today, creating lots of cases > where the operator has to sacrifice PMTUD. rfc1918/ULA on interfaces plus RPF later on ? SP edge filtering of IF-address ranges ? Any other known systematic reasons ? Would be good to document systematic reasons to make sure suggested workarounds can fix them. The main problem iwth such a command is to make operators not forget applying it. Or even having an address that would allow for the packet to be passed back. > 2. Recommend that firewall implementations "SHOULD NOT" filter ICMPv4 > type 3 code 4 (fragmentation needed) messages or ICMPv6 type 2 (packet > too big) messages unless explicitly configured to do so. In other > words, the instruction to filter all ICMP will not result in dropping > fragmentation needed messages but the explicit instruction to drop > fragmentation needed messages specifically will. Today's firewall > tools make it too easy to accidentally kill PMTUD. I am a lot more pessimistic of any form of IETF recommendation to impact firewalls positively. At its core, most IETF design does not even acknowledge the need for firewalls and has not designed network services for their presence. I would also bet there are possible attack vectors with ICMP fragmentation needed messages. And what else does a fireall operator need to break something... We can try of course. I think these days the way how you would be achieve something like that is to define some YANG model that contains the equivalent of such commands - You can make such a YANG model standards track. CLI recommendations at best are BCP. > Let's maximize the chance of PMTUD working as designed and then build > something optimized for the residual cases where it still doesn't. > > > Write rfc4821bis with recommendations for an additional, > > simplified procedure dropping to 1280/576 and use most simple upspeeding > > option ? > > That is #3. And I'd like to be smart about fallback at the expense of > efficiency in the black hole case. Send the 1280 packet. If it works, > send another full size packet to confirm it still fails before > accepting 1280 as the path mtu. If the 1280 and 576 packets don't work > either, don't try the fallback again: it's not path mtu. Maybe the RFC > is already smart about this; I didn't read closely enough. > > 4. Go back to the ground truths and reconsider whether we have > satisfactory information at layer 3 to make reliable decisions about > path mtu. Because of the fate sharing issue, I think PMTUD wants to be > a layer 4 problem implemented independently in each layer 4 protocol > with layer 3 offering hints from ICMP when available. Maybe this is > something that should be kicked over to the IRTF for investigation. Sure, you can bring the problem to PANRG. The main issue is that cool new solutions will not fix broken old equipment, so most efforts we seem to spend in IETF are about workarounds for that broken old equipment (points 1..3). And every time you try to do something new & better, you get hammered down by IETF with "oh, this will take a decade to see any adoption, go away". > Regards, > Bill Herrin > > > -- > William Herrin ................ herrin@dirtside.com bill@herrin.us > Dirtside Systems ......... Web: > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm -- --- tte@cs.fau.de From nobody Fri Mar 30 07:10:19 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5C73B126DCA for ; Fri, 30 Mar 2018 07:10:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.961 X-Spam-Level: X-Spam-Status: No, score=-3.961 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id v6pxYPny8iWt for ; Fri, 30 Mar 2018 07:10:15 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A8AF6126C22 for ; Fri, 30 Mar 2018 07:10:15 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [131.188.34.77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 62A0658C4C8; Fri, 30 Mar 2018 16:10:11 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 488BAB0DE9A; Fri, 30 Mar 2018 16:10:11 +0200 (CEST) Date: Fri, 30 Mar 2018 16:10:11 +0200 From: Toerless Eckert To: Mikael Abrahamsson Cc: Gorry Fairhurst , tcpm@ietf.org, Joe Touch Message-ID: <20180330141011.GI3590@faui40p.informatik.uni-erlangen.de> References: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> <572210fa-74ae-0edf-ce10-d66153ae80a3@strayalpha.com> <5ABDE5ED.7060508@erg.abdn.ac.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 14:10:17 -0000 Michael, question: On Fri, Mar 30, 2018 at 10:04:38AM +0200, Mikael Abrahamsson wrote: > Agreed. So I want SOMETHING that works around PMTU blackholes, and I > want people to deploy it. The smarter and advanced the algorithm, > the less chance people will deploy it (it seems, since it's default > off everywhere). Is it a problem of enabling it because its not on per default, or is the more complex algorithm actually missing in the source code of important OS ? I had the impression from the thread it was the latter ?! Toerless > The fundamental problem I want to solve is PMTU blackhole. I want to > solve this by doing PLPMTUD, and I want to discuss how to get this > into a default-on state on basically everything shipped, and perhaps > even into older versions that receive updates. > > -- > Mikael Abrahamsson email: swmike@swm.pp.se > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm -- --- tte@cs.fau.de From nobody Fri Mar 30 07:13:34 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F38A5126DCA for ; Fri, 30 Mar 2018 07:13:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.311 X-Spam-Level: X-Spam-Status: No, score=-4.311 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=swm.pp.se Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id u6druzX5kaZc for ; Fri, 30 Mar 2018 07:13:30 -0700 (PDT) Received: from uplift.swm.pp.se (ipv6.swm.pp.se [IPv6:2a00:801::f]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BCB99126C22 for ; Fri, 30 Mar 2018 07:13:30 -0700 (PDT) Received: by uplift.swm.pp.se (Postfix, from userid 501) id 7A2D5AF; Fri, 30 Mar 2018 16:13:28 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=swm.pp.se; s=mail; t=1522419208; bh=eQPUxWtwccgGXsWdmL8aWjiWD+/HjDJNyilMUSbw+zE=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=Tnb5bR+OsBceHmWK2JSbQZ64dSMTJsNsMXVelNNbnqmJZwuqVLriqRwUAy4HD+Pxr MjMHhiTCcb4PuFbXYTmvMeFjaTPbPyc73346O1pV7p7X5nnKlzVzewiD1NRwTPwY91 ve+Oe9C19GjdZXKi22+/sdC/Kcor/Nt2jPDg+dMA= Received: from localhost (localhost [127.0.0.1]) by uplift.swm.pp.se (Postfix) with ESMTP id 77F129F; Fri, 30 Mar 2018 16:13:28 +0200 (CEST) Date: Fri, 30 Mar 2018 16:13:28 +0200 (CEST) From: Mikael Abrahamsson To: Toerless Eckert cc: tcpm@ietf.org In-Reply-To: <20180330141011.GI3590@faui40p.informatik.uni-erlangen.de> Message-ID: References: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> <572210fa-74ae-0edf-ce10-d66153ae80a3@strayalpha.com> <5ABDE5ED.7060508@erg.abdn.ac.uk> <20180330141011.GI3590@faui40p.informatik.uni-erlangen.de> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) Organization: People's Front Against WWW MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 14:13:33 -0000 On Fri, 30 Mar 2018, Toerless Eckert wrote: > Is it a problem of enabling it because its not on per default, or is the > more complex algorithm actually missing in the source code of important > OS ? I had the impression from the thread it was the latter ?! When I am asking why it's not on by default, people claim it has drawbacks, that's why it's not on by default. So to get SOMETHING on by default, I'm now trying to convince people to at least do PMTUD blackhole detection and workaround in the completely pathological case of "ok, I've had 5-10 seconds of outage, I'm in slow-start, let's see if a smaller packet can make it through". If people can't agree that this kind of feature can be default-on, I don't know what could. -- Mikael Abrahamsson email: swmike@swm.pp.se From nobody Fri Mar 30 07:18:07 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0EB7C126DCA for ; Fri, 30 Mar 2018 07:18:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.989 X-Spam-Level: X-Spam-Status: No, score=-1.989 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, T_SPF_PERMERROR=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fYU1sbEYMTY4 for ; Fri, 30 Mar 2018 07:18:03 -0700 (PDT) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D6071126C22 for ; Fri, 30 Mar 2018 07:18:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=To:References:Message-Id:Cc:Date:In-Reply-To: From:Subject:Mime-Version:Content-Type:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=ZASC7yxwKYhhWiQEAandp/1UCnOU3Um80+3uoTHuK9g=; b=oYuGDYLlcLBkxes4KKsbqPk4/ oEknz42oRlAbwJbXOfzHnZRdHgXFs7WTucad/Zs9nPo9Bt+LU8a43e8TczazO6q8o6apQXPO8PsHW dLND3VjaeSMD+Dgg0Gv/bXyfMgJAb+njEntrbpPRcxHowvFZjkZIWLjb2Df7iCccaiRjSWoD9hJ9p jIgdphZSeEl5v6Gh6XbvZrXydvkhhbvBO3MTt3QIMG389QzcgLKSH538PhGUExW7aehsfKjBinYxu sbQIWqPrbrRx00VxEDEmFaQSGNPWPU3UkVGR+uKfwhshe/2fZxZ/meuMUjvZB5gkA504y3cb86Mw+ XAWtQKQ1Q==; Received: from cpe-172-250-240-132.socal.res.rr.com ([172.250.240.132]:52313 helo=[192.168.1.77]) by server217.web-hosting.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1f1uqi-001skV-KL; Fri, 30 Mar 2018 10:17:51 -0400 Content-Type: multipart/alternative; boundary="Apple-Mail=_FBDFEB56-3CDF-4CA2-903A-596151C01DA1" Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) From: Joe Touch In-Reply-To: Date: Fri, 30 Mar 2018 07:17:42 -0700 Cc: Gorry Fairhurst , tcpm@ietf.org Message-Id: References: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> <572210fa-74ae-0edf-ce10-d66153ae80a3@strayalpha.com> <5ABDE5ED.7060508@erg.abdn.ac.uk> To: Mikael Abrahamsson X-Mailer: Apple Mail (2.3445.5.20) X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 14:18:06 -0000 --Apple-Mail=_FBDFEB56-3CDF-4CA2-903A-596151C01DA1 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On Mar 30, 2018, at 1:04 AM, Mikael Abrahamsson = wrote: >=20 >> Just to be sure, the email thread was entitled PLPMTUD, and yet it = talks about PMTU blakcholes. >=20 > I believe these are closely related. A PMTU blackhole detection = algorithm, needs to do some PLPMTUD.=20 IMO, this is looking at the problem the wrong way. PMTUD and blackhole detection tries to find out what doesn=E2=80=99t = work. PLPMTUD tries to find out what does work. It can just as easily find = other issues, such as conditions where large packets take paths with = longer delay or higher loss (depending on how the feedback algorithm is = written). Basically, the probing system should be trying to find out the place = where the connection has better goodput. That includes considering not = only whether a packet gets there, but also with what latency, loss, and = (if the TCP implementation is sensitive to this) reordering. This is ultimately a kind of a Kalman filter with many inputs that need = to control a few outputs - packet size, transmission rate, number of = outstanding snack=E2=80=99d packets, and (possibly too) packet repeats. Joe= --Apple-Mail=_FBDFEB56-3CDF-4CA2-903A-596151C01DA1 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

On Mar 30, 2018, at 1:04 AM, Mikael Abrahamsson <swmike@swm.pp.se> = wrote:

Just to be sure, the email = thread was entitled PLPMTUD, and yet it talks about PMTU blakcholes.

I believe these are closely related. A = PMTU blackhole detection algorithm, needs to do some PLPMTUD. 

IMO, this is looking at the = problem the wrong way.

PMTUD and blackhole detection tries to find out what = doesn=E2=80=99t work.

PLPMTUD tries to find out what does work. It can just as = easily find other issues, such as conditions where large packets take = paths with longer delay or higher loss (depending on how the feedback = algorithm is written).

Basically, the probing system should be trying to find out = the place where the connection has better goodput. That includes = considering not only whether a packet gets there, but also with what = latency, loss, and (if the TCP implementation is sensitive to this) = reordering.

This= is ultimately a kind of a Kalman filter with many inputs that need to = control a few outputs - packet size, transmission rate, number of = outstanding snack=E2=80=99d packets, and (possibly too) packet = repeats.

Joe
= --Apple-Mail=_FBDFEB56-3CDF-4CA2-903A-596151C01DA1-- From nobody Fri Mar 30 07:23:31 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E4EC812D7EF for ; Fri, 30 Mar 2018 07:23:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.989 X-Spam-Level: X-Spam-Status: No, score=-1.989 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, T_SPF_PERMERROR=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oLXlRJNSMi6B for ; Fri, 30 Mar 2018 07:23:28 -0700 (PDT) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 40511126C22 for ; Fri, 30 Mar 2018 07:23:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=To:References:Message-Id:Cc:Date:In-Reply-To: From:Subject:Mime-Version:Content-Type:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=hu2ppdoXB8pcqeabob6vN+nLSgXCk8Nf1MUVLuawB8g=; b=x0+d7fwrF5DTHlB9+vXatlf4U 93ekVtzOqE8qjQNjad5hDQvf/7ugyyoJZ+Ys6kGEJp8v/tYVuRtZb5/gGaP7mD+eJuOLBhX+gTKV5 /n38CyAFYQN0YVqWAXLWIsnBLp49yeLzA2H4Cp8Imfv6Oa3PBDFndwvtOGqYvQNuY+iZNwbd/jS2I gUbVh30tpTzrzPtDZIMhK/ShhIUBWX2xJXLtNNOGZfhAR5VYYjtk67gi9VjERzlsdJg7OYcYxUc3T /FtJvCsnqACgLS8xIuoV7ozv4v6cPiJgfwWLIgO2HUWPFRdVyGA3rF6NOL415v2bXzMLkibSbirWV h3Domq2AQ==; Received: from cpe-172-250-240-132.socal.res.rr.com ([172.250.240.132]:52318 helo=[192.168.1.77]) by server217.web-hosting.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1f1uvu-00256D-9D; Fri, 30 Mar 2018 10:23:15 -0400 Content-Type: multipart/alternative; boundary="Apple-Mail=_7503565C-05E3-4042-B69D-F20E987EE0EF" Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) From: Joe Touch In-Reply-To: <20180330141011.GI3590@faui40p.informatik.uni-erlangen.de> Date: Fri, 30 Mar 2018 07:23:04 -0700 Cc: Mikael Abrahamsson , Gorry Fairhurst , tcpm@ietf.org Message-Id: References: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> <572210fa-74ae-0edf-ce10-d66153ae80a3@strayalpha.com> <5ABDE5ED.7060508@erg.abdn.ac.uk> <20180330141011.GI3590@faui40p.informatik.uni-erlangen.de> To: Toerless Eckert X-Mailer: Apple Mail (2.3445.5.20) X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 14:23:30 -0000 --Apple-Mail=_7503565C-05E3-4042-B69D-F20E987EE0EF Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On Mar 30, 2018, at 7:10 AM, Toerless Eckert wrote: >=20 > On Fri, Mar 30, 2018 at 10:04:38AM +0200, Mikael Abrahamsson wrote: >> Agreed. So I want SOMETHING that works around PMTU blackholes, and I >> want people to deploy it. The smarter and advanced the algorithm, >> the less chance people will deploy it (it seems, since it's default >> off everywhere). >=20 > Is it a problem of enabling it because its not on per default, or > is the more complex algorithm actually missing in the source code > of important OS ? I had the impression from the thread it was the = latter ?! >=20 > Toerless AFAICT, there are other significant issues: - NATs - tunnels (esp. encrypted ones) In both cases, an ICMP that arrives might not be able to be translated = into the appropriate upstream indication - even if the device WANTED to = participate. Ultimately, getting info direct from the network as to what doesn=E2=80=99= t work is always problematic. It can be useful - when available - for = debugging, but IMO should never be the basis of normal operations. There are two solutions to MTU discovery: - for IPv4, use positive E2E feedback (PLPMTUD), but also let it control = anything that helps goodput (i.e., PLPMTUD isn=E2=80=99t separate from = congestion control or any other feedback) - use IPv6 and go home (we shouldn=E2=80=99t be optimizing PMTUD for = IPv6 - we should just be sticking to IPv6 MTU requirements Joe= --Apple-Mail=_7503565C-05E3-4042-B69D-F20E987EE0EF Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

On Mar 30, 2018, at 7:10 AM, Toerless Eckert <tte@cs.fau.de> = wrote:

On Fri, Mar 30, 2018 at = 10:04:38AM +0200, Mikael Abrahamsson wrote:
Agreed. So I want SOMETHING = that works around PMTU blackholes, and I
want people to = deploy it. The smarter and advanced the algorithm,
the = less chance people will deploy it (it seems, since it's default
off everywhere).

Is it a problem of enabling it because its not = on per default, or
is the more complex algorithm actually = missing in the source code
of important OS ? I had the = impression from the thread it was the latter ?!
Toerless

AFAICT, there are other significant = issues:

- = NATs
- tunnels (esp. encrypted ones)

In both cases, an ICMP = that arrives might not be able to be translated into the appropriate = upstream indication - even if the device WANTED to = participate.

Ultimately, getting info direct from the network as to what = doesn=E2=80=99t work is always problematic. It can be useful - when = available - for debugging, but IMO should never be the basis of normal = operations.

There are two solutions to MTU discovery:
- for IPv4, use positive E2E feedback (PLPMTUD), but also let = it control anything that helps goodput (i.e., PLPMTUD isn=E2=80=99t = separate from congestion control or any other feedback)
- use IPv6 and go home (we shouldn=E2=80=99t be optimizing = PMTUD for IPv6 - we should just be sticking to IPv6 MTU = requirements

Joe
= --Apple-Mail=_7503565C-05E3-4042-B69D-F20E987EE0EF-- From nobody Fri Mar 30 07:28:18 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C35AD12D7EF for ; Fri, 30 Mar 2018 07:28:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.311 X-Spam-Level: X-Spam-Status: No, score=-4.311 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=swm.pp.se Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 55XLxhrJcrbu for ; Fri, 30 Mar 2018 07:28:15 -0700 (PDT) Received: from uplift.swm.pp.se (swm.pp.se [212.247.200.143]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4795E126C22 for ; Fri, 30 Mar 2018 07:28:15 -0700 (PDT) Received: by uplift.swm.pp.se (Postfix, from userid 501) id 76CEAAF; Fri, 30 Mar 2018 16:28:12 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=swm.pp.se; s=mail; t=1522420092; bh=+pfv+v9h2Tmy1VOi7KNOMhaTkd61tb9Fm0sirbSEqIU=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=rP4lZFMobWJngT7Y3KKaY7yBm2uM4HDxMRRUWFMojALnNOmBAMtHV+MlaQE/9ItZl 8gO1Xajygh+Ln+2WbwkuFaWxYS4e2vxkuH05m02pdd77+0sFy05oqBA/JrIuhd4Se/ QbJIj4mTlEW9zJiULatYabppqESqzTqZlsdb04sE= Received: from localhost (localhost [127.0.0.1]) by uplift.swm.pp.se (Postfix) with ESMTP id 752919F; Fri, 30 Mar 2018 16:28:12 +0200 (CEST) Date: Fri, 30 Mar 2018 16:28:12 +0200 (CEST) From: Mikael Abrahamsson To: Joe Touch cc: tcpm@ietf.org In-Reply-To: Message-ID: References: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> <572210fa-74ae-0edf-ce10-d66153ae80a3@strayalpha.com> <5ABDE5ED.7060508@erg.abdn.ac.uk> <20180330141011.GI3590@faui40p.informatik.uni-erlangen.de> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) Organization: People's Front Against WWW MIME-Version: 1.0 Content-Type: multipart/mixed; BOUNDARY="-137064504-1152003399-1522420092=:20609" Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 14:28:17 -0000 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. ---137064504-1152003399-1522420092=:20609 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8BIT On Fri, 30 Mar 2018, Joe Touch wrote: > - use IPv6 and go home (we shouldn’t be optimizing PMTUD for IPv6 - we > should just be sticking to IPv6 MTU requirements In the longer term, I want to be able to deploy jumbo frames and run 9k access network including customer LAN. This means that a stupid MTU1280 fallback isn't optimal, even though I'll gladly take that if the alternative is no PMTU blackhole detect at all. -- Mikael Abrahamsson email: swmike@swm.pp.se ---137064504-1152003399-1522420092=:20609-- From nobody Fri Mar 30 07:34:36 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B479A12D7F3 for ; Fri, 30 Mar 2018 07:34:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.99 X-Spam-Level: X-Spam-Status: No, score=-1.99 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_SPF_PERMERROR=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id x1qA_iO_jisv for ; Fri, 30 Mar 2018 07:34:34 -0700 (PDT) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1CA7A12D7EF for ; Fri, 30 Mar 2018 07:34:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=To:References:Message-Id: Content-Transfer-Encoding:Cc:Date:In-Reply-To:From:Subject:Mime-Version: Content-Type:Sender:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=+Hb2QwSW5GSsDDEgMIybC5fn8rJtjaMJJPLoPz30TG8=; b=cjIXwZ1ArFmiUBufnOkNLQHrS k8OazPqlvjGDwIwh6mFaoU7Zj+8bfYy5/72LNM4OjuciTHGHX/rQjoXY2G9HaUy02Fq5+jmVCAUih NY+k3p6lqVprkQw90loFpt7IsN2/PFuVX9chQ8Vk3HErWrXb/4gKyM5biT5GIChKSZIFcnLnnqW/R ZOaqcquGGDqxUsx4DY/2AYIosjTwvBGB/r9xlxeb3Fd4vONF1SZ7U7a6cJEKVe1pNoIcD489NxdaN /szH8TPESVH8zNe3A1MrW+ZM/x6qvGGeSZ7SP8uYzrD+hFLkcHCIERYlpisqf2/Htv+ItMiutUzxX ZZxjqVinw==; Received: from cpe-172-250-240-132.socal.res.rr.com ([172.250.240.132]:52503 helo=[192.168.1.77]) by server217.web-hosting.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1f1v6m-002FZ1-Rs; Fri, 30 Mar 2018 10:34:28 -0400 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) From: Joe Touch In-Reply-To: Date: Fri, 30 Mar 2018 07:34:23 -0700 Cc: tcpm@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> <572210fa-74ae-0edf-ce10-d66153ae80a3@strayalpha.com> <5ABDE5ED.7060508@erg.abdn.ac.uk> <20180330141011.GI3590@faui40p.informatik.uni-erlangen.de> To: Mikael Abrahamsson X-Mailer: Apple Mail (2.3445.5.20) X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 14:34:36 -0000 > On Mar 30, 2018, at 7:28 AM, Mikael Abrahamsson = wrote: >=20 > On Fri, 30 Mar 2018, Joe Touch wrote: >=20 >> - use IPv6 and go home (we shouldn=E2=80=99t be optimizing PMTUD for = IPv6 - we should just be sticking to IPv6 MTU requirements >=20 > In the longer term, I want to be able to deploy jumbo frames and run = 9k access network including customer LAN. This means that a stupid = MTU1280 fallback isn't optimal, even though I'll gladly take that if the = alternative is no PMTU blackhole detect at all. That =E2=80=9Cstupid=E2=80=9D default MTU is the basis of all IPv6 = performance comparison, IMO.=20 Yes, it *might* be useful to run faster, but a system that supports 1280 = isn=E2=80=99t a =E2=80=9Cfallback=E2=80=9D - it=E2=80=99s the upper = bound until you know otherwise. Sure, it might be useful to be able to = know otherwise, but don=E2=80=99t expect everyone to engineer and deploy = network devices that actively participate in your desire to optimize. Again, this is why it=E2=80=99s important to fix this E2E. But it=E2=80=99= s also why it=E2=80=99s important to fix this as a *system* of = parameters, not just a single one. Do you really care whether your = protocol uses 9K packets, or that it goes faster? Would you push to use = a larger packet size of it increased loss or delay? That=E2=80=99s why we need to look at this as a whole and not try to fix = each parameter determination in isolation. Joe= From nobody Fri Mar 30 07:40:25 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5BD1B126D85 for ; Fri, 30 Mar 2018 07:40:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.961 X-Spam-Level: X-Spam-Status: No, score=-3.961 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3K47moqCV6DU for ; Fri, 30 Mar 2018 07:40:22 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 20B4D126C22 for ; Fri, 30 Mar 2018 07:40:22 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [131.188.34.77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 40E1158C4C8; Fri, 30 Mar 2018 16:40:18 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 1F079B0DE9A; Fri, 30 Mar 2018 16:40:18 +0200 (CEST) Date: Fri, 30 Mar 2018 16:40:17 +0200 From: Toerless Eckert To: Mikael Abrahamsson Cc: tcpm@ietf.org Message-ID: <20180330144017.GK3590@faui40p.informatik.uni-erlangen.de> References: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> <572210fa-74ae-0edf-ce10-d66153ae80a3@strayalpha.com> <5ABDE5ED.7060508@erg.abdn.ac.uk> <20180330141011.GI3590@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 14:40:23 -0000 So, what would happen if TCP applications that do not need max performance would default to 1280 ? And only those that need would go through the trouble of higher MTU negotiation. Maybe not even during startup but after some seconds (aka: only longer lived flows, therefore also reducing the number of flows trying to do PMTUD that could result in ICMP replies) ? Network gear at places with high utilization is typically scoped to perform @ linerate for 128 byte average or even smaller. I can't see how this would therefore hurt useful equipment badly. I may be totally wrong on this though, but mileage of "useful" varies widely ;-) Might even create another interesting throughput distinction between "default is fine" and "high throughput" flow, although i totally can not guess the outcome. Eg: Everything else being equal, a congestion point has a bunch of TCP flows with 1280 and another bunch with 8192. Q: whats going to be their bandwidth share (with default queuing or one of our AQM schemes on the congestion queue) ? Cheers Toerless On Fri, Mar 30, 2018 at 04:13:28PM +0200, Mikael Abrahamsson wrote: > On Fri, 30 Mar 2018, Toerless Eckert wrote: > > >Is it a problem of enabling it because its not on per default, or > >is the more complex algorithm actually missing in the source code > >of important OS ? I had the impression from the thread it was the > >latter ?! > > When I am asking why it's not on by default, people claim it has > drawbacks, that's why it's not on by default. > > So to get SOMETHING on by default, I'm now trying to convince people > to at least do PMTUD blackhole detection and workaround in the > completely pathological case of "ok, I've had 5-10 seconds of > outage, I'm in slow-start, let's see if a smaller packet can make it > through". > > If people can't agree that this kind of feature can be default-on, I > don't know what could. > > -- > Mikael Abrahamsson email: swmike@swm.pp.se -- --- tte@cs.fau.de From nobody Fri Mar 30 08:01:20 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C4AE71270A3 for ; Fri, 30 Mar 2018 08:01:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.99 X-Spam-Level: X-Spam-Status: No, score=-1.99 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_SPF_PERMERROR=0.01] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ph5HAY7U2bSa for ; Fri, 30 Mar 2018 08:01:17 -0700 (PDT) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 953AB127076 for ; Fri, 30 Mar 2018 08:01:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=To:References:Message-Id: Content-Transfer-Encoding:Cc:Date:In-Reply-To:From:Subject:Mime-Version: Content-Type:Sender:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=nYKpTI7sX6YPraENugb8cY4D3wIw05J9ntOgrwld6mg=; b=E0C2569zoW9HusdL3HcJv5xEC biwoh/E66V2uj6eq8F6U/3iKF7STLzDgezxTel6PkFNjGMruRaUMxlbARJVG3e8Rw8ArUjWRs7y1G sM5IplvdViIz5iSu/EPSlv6yQv5iI9clS+sGlZeeMYKFB34B2yhS6wXTe1Wdb8iUbzPATVwQbhKdc Tqy9sL9lE1hu/5GVgBBZSr7MRSUXfpGB0tJ8JM/zgh6is/CUScmn1JynlOErLvKwbNFML2/AiNWOR tO8m4Kt1mQmEvhTDImo2k8dvbMW0TfjEpjWE9WTe4QtZjIR+znGNAL8ZJmMoz7X1/GHHDxJixK9z5 CyHjzzesQ==; Received: from cpe-172-250-240-132.socal.res.rr.com ([172.250.240.132]:52573 helo=[192.168.1.77]) by server217.web-hosting.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1f1vWI-002iEd-LR; Fri, 30 Mar 2018 11:01:06 -0400 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) From: Joe Touch In-Reply-To: <20180330144017.GK3590@faui40p.informatik.uni-erlangen.de> Date: Fri, 30 Mar 2018 08:00:45 -0700 Cc: Mikael Abrahamsson , tcpm@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <08fb7ec5406418e439391c66bc108d5d@strayalpha.com> <572210fa-74ae-0edf-ce10-d66153ae80a3@strayalpha.com> <5ABDE5ED.7060508@erg.abdn.ac.uk> <20180330141011.GI3590@faui40p.informatik.uni-erlangen.de> <20180330144017.GK3590@faui40p.informatik.uni-erlangen.de> To: Toerless Eckert X-Mailer: Apple Mail (2.3445.5.20) X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 15:01:20 -0000 > On Mar 30, 2018, at 7:40 AM, Toerless Eckert wrote: >=20 >=20 > So, what would happen if TCP applications that do not need > max performance would default to 1280 ? For IPv6, nothing should happen. > And only those that need > would go through the trouble of higher MTU negotiation. Which, FWIW, would be fairly rare - yes, bulk transfers between = datacenter might care, but in many other cases, it wouldn=E2=80=99t come = up. > Maybe > not even during startup but after some seconds (aka: only longer > lived flows, therefore also reducing the number of flows trying to > do PMTUD that could result in ICMP replies) ? Sure... >=20 > Network gear at places with high utilization is typically scoped > to perform @ linerate for 128 byte average or even smaller. I > can't see how this would therefore hurt useful equipment badly. > I may be totally wrong on this though, but mileage of "useful" > varies widely ;-) Going faster for larger packets is typically an end system optimization, = not a network path one. > Might even create another interesting throughput distinction > between "default is fine" and "high throughput" flow, > although i totally can not guess the outcome. Eg: Everything else > being equal, a congestion point has a bunch of TCP flows with 1280 > and another bunch with 8192. Q: whats going to be their > bandwidth share (with default queuing or one of our AQM schemes on > the congestion queue) ? ABC should help with that, but yes, there=E2=80=99s also the issue of = the =E2=80=9Cgranularity=E2=80=9D of congestion control. It helps if the = send window is typically composed of around 10-20 =E2=80=9Cunits of = congestion feedback=E2=80=9D. This is why it actually can help some = flows to use smaller packets - esp. over low speed or congested paths. Again, this should all go into something that would look a lot like a = Kalman filter, IMO. Joe >=20 > Cheers > Toerless >=20 > On Fri, Mar 30, 2018 at 04:13:28PM +0200, Mikael Abrahamsson wrote: >> On Fri, 30 Mar 2018, Toerless Eckert wrote: >>=20 >>> Is it a problem of enabling it because its not on per default, or >>> is the more complex algorithm actually missing in the source code >>> of important OS ? I had the impression from the thread it was the >>> latter ?! >>=20 >> When I am asking why it's not on by default, people claim it has >> drawbacks, that's why it's not on by default. >>=20 >> So to get SOMETHING on by default, I'm now trying to convince people >> to at least do PMTUD blackhole detection and workaround in the >> completely pathological case of "ok, I've had 5-10 seconds of >> outage, I'm in slow-start, let's see if a smaller packet can make it >> through". >>=20 >> If people can't agree that this kind of feature can be default-on, I >> don't know what could. >>=20 >> --=20 >> Mikael Abrahamsson email: swmike@swm.pp.se >=20 > --=20 > --- > tte@cs.fau.de >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm From nobody Fri Mar 30 08:21:57 2018 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7BBE0127076 for ; Fri, 30 Mar 2018 08:21:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GHMT4adNpPGQ for ; Fri, 30 Mar 2018 08:21:54 -0700 (PDT) Received: from magic.dirtside.com (magics.dirtside.com [199.33.225.25]) by ietfa.amsl.com (Postfix) with ESMTP id 7230A126FDC for ; Fri, 30 Mar 2018 08:21:54 -0700 (PDT) Received: from minoc.dirtside.com (minoc.dirtside.com [70.184.240.82]) by magic.dirtside.com (8.14.3/) with ESMTP id w2UFLm3c005069 for ; Fri, 30 Mar 2018 11:21:48 -0400 X-Really-To: Received: from mail-pg0-f53.google.com (mail-pg0-f53.google.com [74.125.83.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by minoc.dirtside.com (Postfix) with ESMTPSA id 8B81FEBDB2 for ; Fri, 30 Mar 2018 11:21:48 -0400 (EDT) Received: by mail-pg0-f53.google.com with SMTP id j3so5233818pgf.2 for ; Fri, 30 Mar 2018 08:21:48 -0700 (PDT) X-Gm-Message-State: AElRT7EelaA6aXgYJ1dVjdF5m12HkRTuTZDNNCHjSvkFQb0zgPKiqXgK sC9F2S26QmQZmp+CEQHNSDPySIMOTYjxob3a87o= X-Google-Smtp-Source: AIpwx4+QQ0/M+GHspEqwNsujPu2bo9pqpZGj03ql7rSGW9cs9/B413lQQx+xB6QJccDWMIO2TJ6EM20SDLd81nlXpgk= X-Received: by 2002:a17:902:8602:: with SMTP id f2-v6mr13086331plo.73.1522423307439; Fri, 30 Mar 2018 08:21:47 -0700 (PDT) MIME-Version: 1.0 Received: by 10.100.183.67 with HTTP; Fri, 30 Mar 2018 08:21:26 -0700 (PDT) In-Reply-To: <20180330140456.GH3590@faui40p.informatik.uni-erlangen.de> References: <20180329174920.GV30215@faui40p.informatik.uni-erlangen.de> <20180330140456.GH3590@faui40p.informatik.uni-erlangen.de> From: William Herrin Date: Fri, 30 Mar 2018 11:21:26 -0400 X-Gmail-Original-Message-ID: Message-ID: To: Toerless Eckert Cc: tcpm@ietf.org Content-Type: text/plain; charset="UTF-8" X-Spam-Checker: magic.dirtside.com Archived-At: Subject: Re: [tcpm] PLPMTUD for all protocols X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Mar 2018 15:21:56 -0000 On Fri, Mar 30, 2018 at 10:04 AM, Toerless Eckert wrote: > On Fri, Mar 30, 2018 at 08:44:46AM -0400, William Herrin wrote: >> 1. Recommend that router implementations "SHOULD" provide the option >> to generate ICMPv4 type 3 code 4 (fragmentation needed) messages and >> ICMPv6 type 2 (packet too big) messages from an address different than >> the source interface address. > > rfc1918/ULA on interfaces plus RPF later on ? > SP edge filtering of IF-address ranges ? Hi Toerless, These are the most common ones AFAIK. > Any other known systematic reasons ? "Don't ping me bro." ACL drops ICMP except to administrative addresses. "Can't get there from here." No route to the source available to the objecting router. MPLS. Objecting router doesn't have the protocol wrapped inside the oversize MPLS frame. > The main problem iwth such a command is to make operators not forget > applying it. Or even having an address that would allow for the packet > to be passed back. Start with making it possible for operators to apply it. If we need more, ask IANA to assign an IP address dedicated to fragmentation needed / packet too big messages and define the conditions in which routers should select that standard address by default instead of the interface local address. Perhaps when the interface is configured with an RFC1918 address but the source of the offending packet is not an RFC1918 address. Then adjust reverse path filtering to pass that standard address. Maybe some delay so that passing the standard address becomes a must for RPF implementations immediately but the default substitution of the standard address should not be enabled by default in implementations for a few years. Tunables all around so that sufficiently savvy (or sufficiently foolish) operators can force the behavior. > I would also bet there are possible > attack vectors with ICMP fragmentation needed messages. One obvious attack vector is to block them. ;) I do take your point though. Regards, Bill -- William Herrin ................ herrin@dirtside.com bill@herrin.us Dirtside Systems ......... Web: