From nobody Fri May 4 08:10:19 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 BE05512EAF3 for ; Thu, 3 May 2018 14:39:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.988 X-Spam-Level: X-Spam-Status: No, score=-1.988 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, 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 0MPmK_BE18sC for ; Thu, 3 May 2018 14:39:00 -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 3664612EAEC for ; Thu, 3 May 2018 14:39:00 -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=a2RKvWNqasXj7yOY0tv95mCCiYx4ydC+gLTGeIqIu6Y=; b=vNzUYpU6lJyAMU2NhF2P1iHa6 30hOQ9l25ss1Kc/WxvFR1h6GveJyPZQgKihbzxHQbuj+9/Zj5z5KdAotYgW9xGNp7y81Fi8F5YGlp I5noHszRNcuAvPUt0CnrB5KMDciu3VvxbZLy3xp0jsFZctf7OetnWb5UKnbvy9w3CYEuQaby6Iw8n MSOibO9Wo1ouV3aTbbzUyqw0cxRGIxFZYbYz82P8EMwKoS5o5h19pAZWLSnjTA3jZTkqoCvVdNMHq BOGCxCplnq3FKHcv50h8QiP6lj6kFX52aaZd1pT6k58PHF+gmpd9oIFlqXLUIfjbMpcRccp5Kmqqv MOuiZk7Jg==; Received: from [::1] (port=41782 helo=webmail.strayalpha.com) by server217.web-hosting.com with esmtpa (Exim 4.89_1) (envelope-from ) id 1fELwE-00471Z-Te; Thu, 03 May 2018 17:38:57 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="=_0db9c171e2caed45a03e9f8eba2f561b" Date: Thu, 03 May 2018 17:38:54 -0400 From: Joe Touch To: RFC Errata System Cc: touch@isi.edu, mankin@psg.com, rbonica@juniper.net, spencerdawkins.ietf@gmail.com, ietf@kuehlewind.net, michael.scharf@nokia.com, tuexen@fh-muenster.de, nishida@sfc.wide.ad.jp, ignacio.goyret@nokia.com, tcpm@ietf.org In-Reply-To: <20180503203252.D2005B82AA4@rfc-editor.org> References: <20180503203252.D2005B82AA4@rfc-editor.org> Message-ID: 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: X-Mailman-Approved-At: Fri, 04 May 2018 08:10:04 -0700 Subject: Re: [tcpm] [Editorial Errata Reported] RFC5925 (5347) 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, 03 May 2018 21:39:03 -0000 --=_0db9c171e2caed45a03e9f8eba2f561b Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII I do not agree that this is suggested text represents a clarification. At best, only the one sentence warrants clarification: From: When included, only the TCP-AO MAC field is zeroed. To: When TCP options are included, within those options only the TCP-AO MAC field is zeroed. However, that context is implicit in the existing text. Yes, we could completely rewrite every RFC to be more clear, but that is not the purpose of errata nor is it productive, IMO. Joe On 2018-05-03 16:32, RFC Errata System wrote: > The following errata report has been submitted for RFC5925, > "The TCP Authentication Option". > > -------------------------------------- > You may review the report below and at: > http://www.rfc-editor.org/errata/eid5347 > > -------------------------------------- > Type: Editorial > Reported by: Ignacio Goyret > > Section: 5.1 > > Original Text > ------------- > 3. The TCP header, by default including options, and where the TCP > checksum and TCP-AO MAC fields are set to zero, all in network- > byte order. > > The TCP option flag of the MKT indicates whether the TCP options > are included in the MAC. When included, only the TCP-AO MAC field > is zeroed. > > When TCP options are not included, all TCP options except for TCP- > AO are omitted from MAC processing. Again, the TCP-AO MAC field > is zeroed for the MAC processing. > > Corrected Text > -------------- > 3. The TCP header and TCP options, where the TCP checksum and TCP-AO > MAC fields are always set to zero, all in network-byte order. > > The TCP option flag of the MKT indicates which TCP options are > included in the MAC. When TCP options are not included, only the > TCP option for TCP-AO (as described in Section 2.2) is included > in the MAC. Otherwise, all the TCP options are included in the MAC. > > Notes > ----- > Rewording for clarity and simplification. > The original text could lead to confusion re '...When included, only the TCP-AO MAC field is zeroed.' > > 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. > > -------------------------------------- > RFC5925 (draft-ietf-tcpm-tcp-auth-opt-11) > -------------------------------------- > Title : The TCP Authentication Option > Publication Date : June 2010 > Author(s) : J. Touch, A. Mankin, R. Bonica > Category : PROPOSED STANDARD > Source : TCP Maintenance and Minor Extensions > Area : Transport > Stream : IETF > Verifying Party : IESG --=_0db9c171e2caed45a03e9f8eba2f561b Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=UTF-8

I do not agree that this is suggested text represents a clarification.

At best, only the one sentence warrants clarification:

From: When included, only the TCP-AO MAC field is zeroed.

To: When TCP options are included, within those options only the TCP-AO = MAC field is zeroed.

 

However, that context is implicit in the existing text. Yes, we could co= mpletely rewrite every RFC to be more clear, but that is not the purpose of= errata nor is it productive, IMO.

Joe

On 2018-05-03 16:32, RFC Errata System wrote:

= The following errata report has been submitted for RFC5925,
"The TCP = Authentication Option".

--------------------------------------<= br /> You may review the report below and at:
http://ww= w.rfc-editor.org/errata/eid5347

---------------------------= -----------
Type: Editorial
Reported by: Ignacio Goyret <ignacio.goyret@= nokia.com>

Section: 5.1

Original Text
= -------------
3. The TCP header, by default including options, and wh= ere the TCP
   checksum and TCP-AO MAC fields are set = to zero, all in network-
   byte order.

&n= bsp;  The TCP option flag of the MKT indicates whether the TCP op= tions
   are included in the MAC.  When included,= only the TCP-AO MAC field
   is zeroed.

&= nbsp;  When TCP options are not included, all TCP options except = for TCP-
   AO are omitted from MAC processing.  = Again, the TCP-AO MAC field
   is zeroed for the MAC p= rocessing.


Corrected Text
--------------
3. T= he TCP header and TCP options, where the TCP checksum and TCP-AO
&nbs= p;  MAC fields are always set to zero, all in network-byte order= =2E

   The TCP option flag of the MKT indicates = which TCP options are
   included in the MAC. When TCP= options are not included, only the
   TCP option for = TCP-AO (as described in Section 2.2) is included
   in= the MAC. Otherwise, all the TCP options are included in the MAC.


Notes
-----
Rewording for clarity and simplification= =2E
The original text could lead to confusion re '...When included, o= nly the TCP-AO MAC field is zeroed.'

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.
<= br /> --------------------------------------
RFC5925 (draft-ietf-tcpm= -tcp-auth-opt-11)
--------------------------------------
Title =             &nb= sp; : The TCP Authentication Option
Publication Date   = ; : June 2010
Author(s)       &nbs= p;   : J. Touch, A. Mankin, R. Bonica
Category  &= nbsp;         : PROPOSED STAND= ARD
Source          &nbs= p;   : TCP Maintenance and Minor Extensions
Area  = ;            &n= bsp; : Transport
Stream       &nbs= p;      : IETF
Verifying Party  &n= bsp;  : IESG
--=_0db9c171e2caed45a03e9f8eba2f561b-- From nobody Fri May 4 08:10:24 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 2EBD112EAC1 for ; Thu, 3 May 2018 13:33:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.2 X-Spam-Level: X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, 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 wfVjMO9iBjkH for ; Thu, 3 May 2018 13:32:58 -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 84F2212EABF for ; Thu, 3 May 2018 13:32:58 -0700 (PDT) Received: by rfc-editor.org (Postfix, from userid 30) id D2005B82AA4; Thu, 3 May 2018 13:32:52 -0700 (PDT) To: touch@isi.edu, mankin@psg.com, rbonica@juniper.net, spencerdawkins.ietf@gmail.com, ietf@kuehlewind.net, michael.scharf@nokia.com, tuexen@fh-muenster.de, nishida@sfc.wide.ad.jp X-PHP-Originating-Script: 30:errata_mail_lib.php From: RFC Errata System Cc: ignacio.goyret@nokia.com, tcpm@ietf.org, rfc-editor@rfc-editor.org Content-Type: text/plain; charset=UTF-8 Message-Id: <20180503203252.D2005B82AA4@rfc-editor.org> Date: Thu, 3 May 2018 13:32:52 -0700 (PDT) Archived-At: X-Mailman-Approved-At: Fri, 04 May 2018 08:10:16 -0700 Subject: [tcpm] [Editorial Errata Reported] RFC5925 (5347) 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, 03 May 2018 20:33:03 -0000 The following errata report has been submitted for RFC5925, "The TCP Authentication Option". -------------------------------------- You may review the report below and at: http://www.rfc-editor.org/errata/eid5347 -------------------------------------- Type: Editorial Reported by: Ignacio Goyret Section: 5.1 Original Text ------------- 3. The TCP header, by default including options, and where the TCP checksum and TCP-AO MAC fields are set to zero, all in network- byte order. The TCP option flag of the MKT indicates whether the TCP options are included in the MAC. When included, only the TCP-AO MAC field is zeroed. When TCP options are not included, all TCP options except for TCP- AO are omitted from MAC processing. Again, the TCP-AO MAC field is zeroed for the MAC processing. Corrected Text -------------- 3. The TCP header and TCP options, where the TCP checksum and TCP-AO MAC fields are always set to zero, all in network-byte order. The TCP option flag of the MKT indicates which TCP options are included in the MAC. When TCP options are not included, only the TCP option for TCP-AO (as described in Section 2.2) is included in the MAC. Otherwise, all the TCP options are included in the MAC. Notes ----- Rewording for clarity and simplification. The original text could lead to confusion re '...When included, only the TCP-AO MAC field is zeroed.' 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. -------------------------------------- RFC5925 (draft-ietf-tcpm-tcp-auth-opt-11) -------------------------------------- Title : The TCP Authentication Option Publication Date : June 2010 Author(s) : J. Touch, A. Mankin, R. Bonica Category : PROPOSED STANDARD Source : TCP Maintenance and Minor Extensions Area : Transport Stream : IETF Verifying Party : IESG From nobody Fri May 4 08:10:28 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 8134F127058 for ; Thu, 3 May 2018 17:21:59 -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, FORGED_MUA_EUDORA=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_DKIMWL_WL_HIGH=-0.01, URIBL_BLOCKED=0.001] autolearn=no 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 7tggtQi-61c9 for ; 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Ip=[135.245.43.119]; Helo=[us70tusmtp2-o.zam.alcatel-lucent.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB6PR0701MB2838 Archived-At: X-Mailman-Approved-At: Fri, 04 May 2018 08:10:16 -0700 Subject: Re: [tcpm] [Editorial Errata Reported] RFC5925 (5347) 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, 04 May 2018 00:21:59 -0000 The reason for the errata is because it happened: someone read that text and interpreted that the tcp checksum would only need to be cleared when only the TCP-AO option was included because the text stated "when included, only the TCP-AO MAC field is zeroed". Your suggested text addition does not address this incorrect interpretation. I also encountered someone that insisted that when only the TCP-AO option was included, that it was only the option data, not its header. That's why a reference to section 2.2 sounds reasonable to me. IMO, this is *exactly* the reason for an "editorial" errata. Technical details are not altered, just language clarifications to promote interoperability. I am not suggesting rewriting this or any other RFC. -Ignacio At 14:38 5/3/2018, Joe Touch wrote: >I do not agree that this is suggested text represents a clarification. > >At best, only the one sentence warrants clarification: > >From: When included, only the TCP-AO MAC field is zeroed. > >To: When TCP options are included, within those options only the TCP-AO MAC field is zeroed. > > >However, that context is implicit in the existing text. Yes, we could completely rewrite every RFC to be more clear, but that is not the purpose of errata nor is it productive, IMO. > >Joe > >On 2018-05-03 16:32, RFC Errata System wrote: >>The following errata report has been submitted for RFC5925, >>"The TCP Authentication Option". >> >>-------------------------------------- >>You may review the report below and at: >>http://www.rfc-editor.org/errata/eid5347 >> >>-------------------------------------- >>Type: Editorial >>Reported by: Ignacio Goyret <ignacio.goyret@nokia.com> >> >>Section: 5.1 >> >>Original Text >>------------- >>3. The TCP header, by default including options, and where the TCP >> checksum and TCP-AO MAC fields are set to zero, all in network- >> byte order. >> >> The TCP option flag of the MKT indicates whether the TCP options >> are included in the MAC. When included, only the TCP-AO MAC field >> is zeroed. >> >> When TCP options are not included, all TCP options except for TCP- >> AO are omitted from MAC processing. Again, the TCP-AO MAC field >> is zeroed for the MAC processing. >> >> >>Corrected Text >>-------------- >>3. The TCP header and TCP options, where the TCP checksum and TCP-AO >> MAC fields are always set to zero, all in network-byte order. >> >> The TCP option flag of the MKT indicates which TCP options are >> included in the MAC. When TCP options are not included, only the >> TCP option for TCP-AO (as described in Section 2.2) is included >> in the MAC. Otherwise, all the TCP options are included in the MAC. >> >> >>Notes >>----- >>Rewording for clarity and simplification. >>The original text could lead to confusion re '...When included, only the TCP-AO MAC field is zeroed.' >> >>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. >> >>-------------------------------------- >>RFC5925 (draft-ietf-tcpm-tcp-auth-opt-11) >>-------------------------------------- >>Title : The TCP Authentication Option >>Publication Date : June 2010 >>Author(s) : J. Touch, A. Mankin, R. Bonica >>Category : PROPOSED STANDARD >>Source : TCP Maintenance and Minor Extensions >>Area : Transport >>Stream : IETF >>Verifying Party : IESG From nobody Fri May 4 08:10:37 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 49AC812D941 for ; Thu, 3 May 2018 18:54:27 -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 4E3G_p1qTdFu for ; Thu, 3 May 2018 18:54:24 -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 EF89812D889 for ; Thu, 3 May 2018 18:54:23 -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=69YLep+HGxPpTprPAq6j943JeXWGxv3GF+orUmb3ysg=; b=ncE7axvojGsV7ZA+bPKfMm7Opg 4fc/VHb3QeeqwzpNC3N+YVNJXFFXWd4/lq2s2zFRN0C3DAPNGiDwylsbUfRmOs1wvabJS3NVrPyRi TyF4lVVxCVp2dhJ8nvQDZpJefJ9bT3BQXW6LWbvrxmQjBriZR1Ql7k2bB4S439ixFLrimfnnnmaW8 Yig2eiMymDgFYvZCzfErZIyCFo+H/G53rqD8w464kdoO8p9oyS2v4DRw5KOvakaMcGkQiJbp6cAMm +ysTvZDwNuIpYcw1BHhWMOtl6CSbXXsk6BSx1eUrrpZtCJ64e2Hd8WAZZGNn36FjM5hOYqCP/du+d I8wuHF0A==; Received: from cpe-172-250-240-132.socal.res.rr.com ([172.250.240.132]:50952 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 1fEPvP-003Slu-QV; Thu, 03 May 2018 21:54:20 -0400 To: Ignacio Goyret Cc: RFC Errata System , touch@isi.edu, mankin@psg.com, rbonica@juniper.net, spencerdawkins.ietf@gmail.com, ietf@kuehlewind.net, michael.scharf@nokia.com, tuexen@fh-muenster.de, nishida@sfc.wide.ad.jp, tcpm@ietf.org References: <20180503203252.D2005B82AA4@rfc-editor.org> <201805040027.w440R3ji011041@cliff.eng.ascend.com> From: Joe Touch Message-ID: Date: Thu, 3 May 2018 18:54:17 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <201805040027.w440R3ji011041@cliff.eng.ascend.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US 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: X-Mailman-Approved-At: Fri, 04 May 2018 08:10:16 -0700 Subject: Re: [tcpm] [Editorial Errata Reported] RFC5925 (5347) 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, 04 May 2018 01:54:27 -0000 On 5/3/2018 5:20 PM, Ignacio Goyret wrote: > The reason for the errata is because it happened: someone read > that text and interpreted that the tcp checksum would only need > to be cleared when only the TCP-AO option was included because the > text stated "when included, only the TCP-AO MAC field is zeroed". > Your suggested text addition does not address this incorrect > interpretation. It actually does directly, with this phrase: "within those options". > I also encountered someone that insisted that when only the TCP-AO > option was included, that it was only the option data, not its header. That is already addressed in the existing text directly here: "When TCP options are not included, all TCP options except for TCP- AO are omitted from MAC processing." > That's why a reference to section 2.2 sounds reasonable to me. Adding the reference might be useful, but should not be strictly necessary to interpret the existing text. > IMO, this is *exactly* the reason for an "editorial" errata. > Technical details are not altered, just language clarifications > to promote interoperability. I am not suggesting rewriting this or > any other RFC. There are many RFCs that have been misinterpreted. That doesn't always warrant suggested alternate text. Joe > > -Ignacio > > > At 14:38 5/3/2018, Joe Touch wrote: > >> I do not agree that this is suggested text represents a clarification. >> >> At best, only the one sentence warrants clarification: >> >> From: When included, only the TCP-AO MAC field is zeroed. >> >> To: When TCP options are included, within those options only the TCP-AO MAC field is zeroed. >> >> >> However, that context is implicit in the existing text. Yes, we could completely rewrite every RFC to be more clear, but that is not the purpose of errata nor is it productive, IMO. >> >> Joe >> >> On 2018-05-03 16:32, RFC Errata System wrote: >>> The following errata report has been submitted for RFC5925, >>> "The TCP Authentication Option". >>> >>> -------------------------------------- >>> You may review the report below and at: >>> http://www.rfc-editor.org/errata/eid5347 >>> >>> -------------------------------------- >>> Type: Editorial >>> Reported by: Ignacio Goyret <ignacio.goyret@nokia.com> >>> >>> Section: 5.1 >>> >>> Original Text >>> ------------- >>> 3. The TCP header, by default including options, and where the TCP >>> checksum and TCP-AO MAC fields are set to zero, all in network- >>> byte order. >>> >>> The TCP option flag of the MKT indicates whether the TCP options >>> are included in the MAC. When included, only the TCP-AO MAC field >>> is zeroed. >>> >>> When TCP options are not included, all TCP options except for TCP- >>> AO are omitted from MAC processing. Again, the TCP-AO MAC field >>> is zeroed for the MAC processing. >>> >>> >>> Corrected Text >>> -------------- >>> 3. The TCP header and TCP options, where the TCP checksum and TCP-AO >>> MAC fields are always set to zero, all in network-byte order. >>> >>> The TCP option flag of the MKT indicates which TCP options are >>> included in the MAC. When TCP options are not included, only the >>> TCP option for TCP-AO (as described in Section 2.2) is included >>> in the MAC. Otherwise, all the TCP options are included in the MAC. >>> >>> >>> Notes >>> ----- >>> Rewording for clarity and simplification. >>> The original text could lead to confusion re '...When included, only the TCP-AO MAC field is zeroed.' >>> >>> 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. >>> >>> -------------------------------------- >>> RFC5925 (draft-ietf-tcpm-tcp-auth-opt-11) >>> -------------------------------------- >>> Title : The TCP Authentication Option >>> Publication Date : June 2010 >>> Author(s) : J. Touch, A. Mankin, R. Bonica >>> Category : PROPOSED STANDARD >>> Source : TCP Maintenance and Minor Extensions >>> Area : Transport >>> Stream : IETF >>> Verifying Party : IESG From nobody Wed May 9 11:30:08 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 98C2412DA19 for ; Wed, 9 May 2018 11:30:06 -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, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_DKIMWL_WL_HIGH=-0.01] 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 jI_TQeFZmGWw for ; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Including tcpm as this can be a review of the TLP portions of draft-ietf-tc= pm-rack-03. From: Praveen Balasubramanian Sent: Tuesday, May 8, 2018 6:13 PM To: Yuchung Cheng ; Neal Cardwell Subject: TLP questions Hey folks, I have some questions on draft-ietf-tcpm-rack-03 mainly around T= LP. 1. "Open state: the sender's loss recovery state machine is in its norm= al, default state: there are no SACKed sequence ranges in the SACK scorebo= ard, and neither fast recovery, timeout-based recovery, nor ECN-based cwnd = reduction are underway. " Open state is defined and then never used. I assume you require that TLP be= scheduled only for connections in open state? I wonder why there is the re= quirement on "no SACKed sequence ranges in the SACK scoreboard". 1. PTO +=3D 2ms If we already are being conservative by waiting 2*SRTT, then how is adding = 2 msec going to help? Was this added due to a real world issue? 1. "If a previously unsent segment exists AND the receive window allows new data to be sent: Transmit that new segment FlightSize +=3D SMSS Else: Retransmit the last segment" This needs to be crisper about what is meant by "previously unsent" and "la= st segment". For example the sender could have sent a large amount of data = and then taken a full RTO. In this case if PTO fires, do "previously unsent= " and "last segment" refer to MSS size segments straddling just before and = after SND.NXT? OR do they straddle around the largest sent sequence number= ever in the connection lifetime? 1. "On each incoming ACK, the sender should cancel any existing loss pr= obe timer." Even on duplicate ACKs? Thanks --_000_CY4PR21MB0630AF5B03B8C260AD72E366B6990CY4PR21MB0630namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Including tcpm as this can be a review of the TLP po= rtions of draft-ietf-tcpm-rack-03.

 

From: Praveen Balasubramanian
Sent: Tuesday, May 8, 2018 6:13 PM
To: Yuchung Cheng <ycheng@google.com>; Neal Cardwell <ncard= well@google.com>
Subject: TLP questions

 

Hey folks, I have some questions on draft-ietf-tcpm-= rack-03 mainly around TLP.

 

  1. “Open state= : the sender's loss recovery state machine is in its  normal, default = state: there are no SACKed sequence ranges in the  SACK scoreboard, an= d neither fast recovery, timeout-based recovery, nor ECN-based cwnd reduction are underway. “

Open state is defined and then never used. I = assume you require that TLP be scheduled only for connections in open state= ? I wonder why there is the requirement on “no SACKed sequence ranges= in the  SACK scoreboard”.

  1. PTO +=3D 2ms<= o:p>

If we already are being conservative by waiti= ng 2*SRTT, then how is adding 2 msec going to help? Was this added due to a= real world issue?

  1. “If a previ= ously unsent segment exists AND

    =      the receive window allows new data to be sent:

    =        Transmit that new segment

    =        FlightSize +=3D SMSS

    =    Else:

    =        Retransmit the last segment”

This needs to be crisper = about what is meant by “previously unsent” and “last segm= ent”. For example the sender could have sent a large amount of data a= nd then taken a full RTO. In this case if PTO fires, do “previously unsent” and “last segment” refer to MSS size segments st= raddling just before and  after SND.NXT? OR do they straddle around th= e largest sent sequence number ever in the connection lifetime?<= /p>

  1. “On each in= coming ACK, the sender should cancel any existing loss  probe timer.&#= 8221;

Even on duplicate ACKs?

 

Thanks

--_000_CY4PR21MB0630AF5B03B8C260AD72E366B6990CY4PR21MB0630namp_-- From nobody Wed May 9 13:27:30 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 F16D9128954 for ; Wed, 9 May 2018 13:27:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -17.5 X-Spam-Level: X-Spam-Status: No, score=-17.5 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_DKIMWL_WL_MED=-0.01, T_KAM_HTML_FONT_INVALID=0.01, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5] 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 Sj_8yRtdrnLO for ; Wed, 9 May 2018 13:27:25 -0700 (PDT) Received: from mail-wr0-x22f.google.com (mail-wr0-x22f.google.com [IPv6:2a00:1450:400c:c0c::22f]) (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 3129012D7F4 for ; Wed, 9 May 2018 13:27:25 -0700 (PDT) Received: by mail-wr0-x22f.google.com with SMTP id h5-v6so12836006wrm.4 for ; Wed, 09 May 2018 13:27:25 -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=7uAeuRxtWbaSK1Tjaw1ogtuZUryA1HypRbbPmiJ94vI=; b=bGTpUW9dvq17iT3SIIqDNy2YrqSZdXnRa5Zyi+YxHoyKqGLbYmMJc5VzwqRIaG4Xhd gXpgkRFomt4ZYIWFO8dlvTQstlVBkObRVw4TziinsIOgOzIYDvyxXtSI6jwJeMgaiais DT4X/34uE7CBgNGnzWaCTNTt0euY6L+Fvx9DfaWK0nH3w+cys6wYOtCvOVX4ZDDpzZnq odJq85f/TQeo8bWqDcIdiQAks69J7kW6wHCtPiMCG1Rav37zhpCGPW6+KQj9AlWKBzqZ lh/bmdbrsRPHYZr2Iw99fmvaGVs0PnwYzWhgLdMWZw+DTxOpbZsWPKX3VvK45VW83MSN ITWg== 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=7uAeuRxtWbaSK1Tjaw1ogtuZUryA1HypRbbPmiJ94vI=; b=ESQLFclX36rxx/meZVv6ZllnvT03Oud/VD8uO8BG7Xc45ZZJ/z/hu+AsI7kIkal8C1 uAdLbhJCT69Mgh/BwFP1NE5OLcbX0rUoNrHEg5ICwjdFASBBZ2BcNj5/ecBfvBPCKPu7 wKBsC58sdiQtTd0nzB3A+tQ7miKxYorInC+Jr5O+0WxDK07KtNmNBMPX5AMcznlQ6Xzr Btnd3FQHiAMqp4KOBvJTwNy2nzaeUZZGJZVjJ5D1g6a46wVOuzp1PTKvhN3CmjOESBVP INKD9b1NTNSRLcY0exB4VdqTUDfz13YASeUcNjJbwEoPNwoQuRZNqJwebfcV18CyiQMW hoQQ== X-Gm-Message-State: ALQs6tBlVFYYFb6UtJuB1H7cHItmLfEgsBVb46q+LvtzXPA3pZeGH/fX tA+7Sazv3OLO6sejqjYwH53Q7iDA8y9Ix4R96kJmCnnv/Ao= X-Google-Smtp-Source: AB8JxZoTS3G6z/ADQEeEwfiYSVup2rzBF62+rX7hMwBDIJ1DG8Xgg99FfR4/mLiHmxV3jY3hT28XKv1KtWz65yL0C6w= X-Received: by 2002:adf:91a2:: with SMTP id 31-v6mr37226846wri.124.1525897643238; Wed, 09 May 2018 13:27:23 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Neal Cardwell Date: Wed, 09 May 2018 20:27:06 +0000 Message-ID: To: Praveen Balasubramanian Cc: Yuchung Cheng , "tcpm@ietf.org" , Nandita Dukkipati , Priyaranjan Jha Content-Type: multipart/alternative; boundary="000000000000fdf30c056bcbba45" Archived-At: Subject: Re: [tcpm] TLP questions 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, 09 May 2018 20:27:29 -0000 --000000000000fdf30c056bcbba45 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, May 9, 2018 at 2:29 PM Praveen Balasubramanian wrote: > Including tcpm as this can be a review of the TLP portions of > draft-ietf-tcpm-rack-03. > > > > *From:* Praveen Balasubramanian > *Sent:* Tuesday, May 8, 2018 6:13 PM > *To:* Yuchung Cheng ; Neal Cardwell < > ncardwell@google.com> > *Subject:* TLP questions > > > > Hey folks, I have some questions on draft-ietf-tcpm-rack-03 mainly around > TLP. > Praveen, thank you for all of these excellent questions, and thanks for bringing this to the tcpm list for discussion! > > > 1. =E2=80=9COpen state: the sender's loss recovery state machine is in= its > normal, default state: there are no SACKed sequence ranges in the SA= CK > scoreboard, and neither fast recovery, timeout-based recovery, nor > ECN-based cwnd reduction are underway. =E2=80=9C > > Open state is defined and then never used. > Yes, thanks for noticing. The phrase "Open state" is used in earlier revisions of the TLP and RACK drafts as a precondition for sending a Tail Loss Probe. We removed its use in draft-ietf-tcpm-rack-03 but forgot to remove the definition in draft-ietf-tcpm-rack-03. We noticed shortly after shipping the -03 text and already removed that definition in our internal draft for draft-ietf-tcpm-rack-04. > I assume you require that TLP be scheduled only for connections in open > state? > That was the original (and long-time) implementation. The "Open" state is the Linux TCP stack term for the default congestion control state where there's nothing in the SACK scoreboard, no ECN cwnd reduction is underway, and we're not doing Fast Recovery or RTO recovery. Originally the Linux TCP code would only schedule a TLP in the "Open" state. But recently the TCP team at Google has analyzed scenarios where this limitation seemed too strict. In particular, we were analyzing a case in the public Linux netdev mailling list ("Re: Linux ECN Handling") where the connection was in the middle of a DCTCP ECN-triggered cwnd reduction, and then suffered a ~300ms timeout that would have been vastly shorter if there had been a TLP for recovery. So we changed the Linux TCP code to allow TLP in ECN-triggered cwnd reductions (b4f70c3d4ec32 "tcp: allow TLP in ECN CWR"). This means that the Linux TCP code is allowing TLP in the ECN cwnd reduction state as well as the "Open" state. We have tried to update the draft in draft-ietf-tcpm-rack-03 and, based on your feedback, will try to make this more crisp/clear in draft-ietf-tcpm-rack-04. Please see below for a proposed update to this part of the text. > I wonder why there is the requirement on =E2=80=9Cno SACKed sequence rang= es in the > SACK scoreboard=E2=80=9D. > This condition dated from the original TLP design, where originally the motivation was to keep the behavior cautious and simple. Now that we have RACK, as a practical matter, we still don't really want a TLP in such cases. Rather, if there is some SACKed sequence range but we are not yet in loss recovery, then typically RACK will install a timer based on the reordering window, and when that timer fires it will mark some packets lost and enter fast recovery. For this reason, the Linux TCP implementation of TLP+RACK still has a "no SACKed sequence ranges in the SACK scoreboard" as a precondition for scheduling a TLP, and IMHO this still makes sense, so I would proposed that in draft-ietf-tcpm-rack-04 we document that by adding a clause to the list of preconditions for scheduling a TLP ("5.4.1. Phase 1: Scheduling a loss probe... A sender should schedule a PTO only if all of the following conditions are met"): The connection has no SACKed sequences in the SACK scoreboard Please see below for where this proposed addition fits into the surrounding text. > > 1. PTO +=3D 2ms > > If we already are being conservative by waiting 2*SRTT, then how is addin= g > 2 msec going to help? Was this added due to a real world issue? > Yes, this is due to real-world issues. In datacenters, with Linux TCP the SRTT could be much lower than 100usec, so even 2*SRTT is a very tight timer, and could result in lots of spurious TLPs, and is not even supported by current retransmission timer mechanisms in common OSes. So the 2ms is to allow for real-world jitter in the network and end hosts. We tried to describe some of these issues in the -03 draft: Similarly, current end-system processing latencies and timer granularities can easily delay ACKs, so senders SHOULD add at least 2ms to a computed PTO value (and MAY add more if the sending host OS timer granularity is more coarse than 1ms). I guess we can add network jitter to this as well, so I'd propose something like the following for -04: * Similarly, network delay variations and end-system processing* * latencies and timer granularities can easily delay ACKs beyond 2*SRTT,* * so senders SHOULD add at least 2ms to a computed PTO value* * (and MAY add more if the sending host OS timer granularity is more* * coarse than 1ms).* Instead of 2ms we could add something like RTTVAR from RFC 6298, but that would add complexity and delay, especially if the receiver is manifesting ~200ms delayed ACKs. And so we have not yet seen evidence that that would be a good trade-off. > 1. =E2=80=9CIf a previously unsent segment exists AND > > the receive window allows new data to be sent: > > Transmit that new segment > > FlightSize +=3D SMSS > > Else: > > Retransmit the last segment=E2=80=9D > > This needs to be crisper about what is meant by =E2=80=9Cpreviously unsen= t=E2=80=9D and > =E2=80=9Clast segment=E2=80=9D. For example the sender could have sent a = large amount of > data and then taken a full RTO. In this case if PTO fires, do =E2=80=9Cpr= eviously > unsent=E2=80=9D and =E2=80=9Clast segment=E2=80=9D refer to MSS size segm= ents straddling just > before and after SND.NXT? OR do they straddle around the largest sent > sequence number ever in the connection lifetime? > Very good questions. I like your suggestion to be crisper in this section. The Linux TCP stack does not "rewind" SND.NXT upon RTO, so in the Linux TCP stack the SND.NXT point and "largest sent sequence number ever in the connection lifetime" are basically the same point. That is the framework in which we were thinking for those lines. In my mind... By "a previously unsent segment" we mean basically "the next segment (of MSS or fewer bytes) that the sender would normally send if it had available cwnd at this time." That is something that presumably every production-quality TCP stack has very quick access to. By "the last segment" we mean "the highest-sequence segment (of MSS or fewer bytes) that has already been transmitted and not ACKed or SACKed." I imagine this should also be generally very quick to access (at least it can be quickly accessed in two generations of the Linux TCP write queue). Let us know if not, and we can discuss. Does that help clarify those parts? If so, we can update the text to incorporate something like that (suggestions?). > > 1. =E2=80=9COn each incoming ACK, the sender should cancel any existin= g loss > probe timer.=E2=80=9D > > Even on duplicate ACKs? > Excellent question. This line is out of date, and does not reflect recent fixes our team made in the Linux TCP stack (df92c8394e6e "tcp: fix xmit timer to only be reset if data ACKed/SACKed"). In fact the TLP/RTO timers should only be rearmed (cancelled and reinstalled at a later time) if certain kinds of real "forward progress" are made. On our internal draft for -04 I have proposed we change this to: Phase 3: ACK processing On each incoming ACK, the sender should check the conditions in Step 1 of Phase 1 to see if it should schedule (or reschedule) the loss probe timer. And then, putting this all together, I would propose something like the following text for Step 1 of Phase 1: ---- *Phase 1: Scheduling a loss probeStep 1: Check conditions for scheduling a PTO.A sender should check to see if it should schedule a PTO in the following situations: 1. After transmitting new data2. Upon receiving an ACK that cumulatively acknowledges data3. Upon receiving a SACK that selectively acknowledges data that was last sent before the segment with SEG.SEQ=3DSND.UNA was last (re)transmittedA sender should schedule a PTO on= ly if all of the following conditions are met: 1. The connection supports SACK [RFC2018]2. The connection has no SACKed sequences in the SACK scoreboard3. The connection is not in loss recovery4. The most recently transmitted data was not itself a TLP probe (i.e. a sender MUST NOT send consecutive or back-to-back TLP probes).If a PTO can be scheduled according to these conditions, the sender should schedule a PTO. If there was a previously scheduled PTO or RTO pending, then that pending PTO or RTO should first be cancelled, and then the new PTO should be scheduled.If a PTO cannot be scheduled according to these conditions, then the sender MUST arm the RTO timer if there is unacknowledged data in flight.* ---- How does that sound? Praveen, thank you again for all these excellent questions and points! cheers, neal --000000000000fdf30c056bcbba45 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Wed, May 9,= 2018 at 2:29 PM Praveen Balasubramanian <pravb@microsoft.com> wrote:

Including tcpm as this can be a review of the TLP po= rtions of draft-ietf-tcpm-rack-03.

=C2=A0

From: Praveen Balasubramanian
Sent: Tuesday, May 8, 2018 6:13 PM
To: Yuchung Cheng <ycheng@google.com>; Neal Cardwell <ncardwell@google.com>
Subject: TLP questions

=C2=A0

Hey folks, I have some questions on draft-ietf-tcpm-= rack-03 mainly around TLP.


= Praveen, thank you for all of these excellent questions, and thanks for bri= nging this to the tcpm list for discussion!
=C2=A0

<= /u>

=C2=A0

  1. =E2=80=9COpen state: the sender's loss recovery= state machine is in its =C2=A0normal, default state: there are no SACKed s= equence ranges in the =C2=A0SACK scoreboard, and neither fast recovery, tim= eout-based recovery, nor ECN-based cwnd reduction are underway. =E2=80=9C

Open state is defi= ned and then never used.

Yes, thanks for n= oticing. The phrase "Open state" is used in earlier revisions of = the TLP and RACK drafts as a precondition for sending a Tail Loss Probe. We= removed its use in=C2=A0draft-ietf-tcpm-rack-03 but forgot to remove the d= efinition in=C2=A0draft-ietf-tcpm-rack-03. We noticed shortly after shippin= g the -03 text and already removed that definition in our internal draft fo= r draft-ietf-tcpm-rack-04.
=C2=A0

I assume you require that TLP be scheduled only for connections in o= pen state?=C2=A0

That was the original (and lon= g-time) implementation.=C2=A0The "Open" state = is the Linux TCP stack term for the default congestion control state where = there's nothing in the SACK scoreboard, no ECN cwnd reduction is underw= ay, and we're not doing Fast Recovery or RTO recovery. Originally the L= inux TCP code would only schedule a TLP in the "Open" state. But = recently the TCP team at Google has analyzed scenarios where this li= mitation seemed too strict. In particular, we were analyzing a case in the = public Linux netdev mailling list ("Re: Linux ECN Handling") wher= e the connection was in the middle of a DCTCP ECN-triggered cwnd reduction,= and then suffered a ~300ms timeout that would have been vastly shorter if = there had been a TLP for recovery. So we changed the Linux TCP code to allo= w TLP in ECN-triggered cwnd reductions (b4f70c3d4ec32 "tcp: allow TLP = in ECN CWR").

This means that the Linux TCP code is allowing TLP in the ECN = cwnd reduction state as well as the "Open" state.=C2=A0 We have t= ried to update the draft in=C2=A0draft-ietf-tcpm-rack-03= and, based on your feedback, will try to make this more crisp/clear in=C2= =A0draft-ietf-tcpm-rack-04. Please see below for a propo= sed update to this part of the text.

I wonder why there is the requireme= nt on =E2=80=9Cno SACKed sequence ranges in the =C2=A0SACK scoreboard=E2=80= =9D.

This condition dated from the origina= l TLP design, where originally the motivation was to keep the behavior caut= ious and simple. Now that we have RACK, as a practical matter, we still don= 't really want a TLP in such cases. Rather, if there is some SACKed seq= uence range but we are not yet in loss recovery, then typically RACK will i= nstall a timer based on the reordering window, and when that timer fires it= will mark some packets lost and enter fast recovery.

<= div>For this reason, the Linux TCP implementation of TLP+RACK still has a &= quot;no SACKed sequence ranges in the SACK scoreboard&qu= ot; as a precondition for scheduling a TLP, and IMHO this still makes sense= , so I would proposed that in=C2=A0draft-ietf-tcpm-rack-04 we docume= nt that by adding a clause to the list of preconditions for scheduling a TL= P ("5.4.1. Phase 1: Scheduling a loss probe... A sender should schedul= e a PTO only if all of the following conditions are met"):
<= br>
=C2=A0 =C2=A0 =C2=A0The connection has no SACKed sequences in the = SACK scoreboard

Please see below for where this proposed addition fi= ts into the surrounding text.

  1. PTO +=3D 2ms

If we already are = being conservative by waiting 2*SRTT, then how is adding 2 msec going to he= lp? Was this added due to a real world issue?

<= div>Yes, this is due to real-world issues. In datacenters, with Linux TCP t= he SRTT could be much lower than 100usec, so even 2*SRTT is a very tight ti= mer, and could result in lots of spurious TLPs, and is not even supported b= y current retransmission timer mechanisms in common OSes. So the 2ms is to = allow for real-world jitter in the network and end hosts. We tried to descr= ibe some of these issues in the -03 draft:

   Similarly, cur=
rent end-system processing latencies and timer
   granularities can easily delay ACKs, so senders SHOULD add at least
   2ms to a computed PTO value (and MAY add more if the sending host OS
   timer granularity is more coarse than 1ms).

I= guess we can add network jitter to this as well, so I'd propose someth= ing like the following for -04:

Similarly, network delay variations and end-system processin= g
latenc= ies and timer granularities can easily delay ACKs beyond 2*SRTT,
so senders SHOULD = add at least 2ms to a computed PTO value
(and MAY add more if the sending host OS t= imer granularity is more
coarse than 1ms).
Instead o= f 2ms we could add something like RTTVAR from RFC 6298, but that would add = complexity and delay, especially if the receiver is manifesting ~200ms dela= yed ACKs. And so we have not yet seen evidence that that would be a good tr= ade-off.

=

  1. =E2=80=9CIf a previously unsent segment exists AND<= u>

=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 =C2=A0the receive window allows new data to be sent:<= u>

=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Transmit that new segment=

=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 FlightSize +=3D SMSS<= /p>

=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 Else:

=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Retransmit the last segment=E2=80= =9D

This needs to be crisper= about what is meant by =E2=80=9Cpreviously unsent=E2=80=9D and =E2=80=9Cla= st segment=E2=80=9D. For example the sender could have sent a large amount = of data and then taken a full RTO. In this case if PTO fires, do =E2=80=9Cp= reviously unsent=E2=80=9D and =E2=80=9Clast segment=E2=80=9D refer to MSS size segme= nts straddling just before and =C2=A0after SND.NXT? OR do they straddle aro= und the largest sent sequence number ever in the connection lifetime?


Very good questions. I like your= suggestion to be crisper in this section. The Linux TCP stack does not &qu= ot;rewind" SND.NXT upon RTO, so in the Linux TCP stack the SND.NXT poi= nt and "largest sent sequence number ever in the co= nnection lifetime" are basically the same point. That is the framework= in which we were thinking for those lines.

In my mind...

By "a=C2= =A0previously unsent segment" we mean basically &quo= t;the next=C2=A0segment (of MSS or fewer bytes) t= hat the sender would normally send if it had available cwnd at this time.&q= uot; That is something that presumably every production-quality TCP stack h= as very quick access to.

the last segment" we mean "the high= est-sequence segment (of MSS or fewer bytes)=C2=A0= that has already been transmitted and not ACKed or SACKed." I imagine = this should also be generally very quick to access (at least it can be quic= kly accessed in two generations of the Linux TCP write queue). Let us know = if not, and we can discuss.

Does that help clarify those pa= rts? If so, we can update the text to incorporate something like that (sugg= estions?).
=C2=A0

  1. =E2=80=9COn each incoming ACK, the sender should ca= ncel any existing loss=C2=A0 probe timer.=E2=80=9D

Even on duplicate = ACKs?

Excellent question. This line is= out of date, and does not reflect recent fixes our team made in the Linux = TCP stack (df92c8394e6e "tcp: fix xmit timer to only be reset if data = ACKed/SACKed").=C2=A0 In fact the TLP/RTO timers should only be rearme= d (cancelled and reinstalled at a later time) if certain kinds of real &quo= t;forward progress" are made. On our internal draft for -04 I have pro= posed we change this to:

=C2=A0 Phase 3: ACK proces= sing

=C2=A0 On each incoming ACK, the sender should check the condit= ions in Step 1 of Phase 1 to see if it should schedule (or reschedule) the = loss probe timer.

And then, putting this all together, I would propo= se something like the following text for Step 1 of Phase 1:

--= --

Phase 1: Scheduling a loss probe


Step 1: Check conditions for scheduling a PT= O.

A sender should check to see if it should s= chedule a PTO in the following situations:

  1. Afte= r transmitting new data

  2. Upon receiving an ACK that cumulatively acknowledges data<= /p>

  3. Upon receiving a SACK= that selectively acknowledges data that was last sent before the segment w= ith SEG.SEQ=3DSND.UNA was last (re)transmitted


A sender should schedule a PTO on= ly if all of the following conditions are met:

  1. = The connection supports SACK [RFC2018]

  2. The connection has no SACKed sequences in the SAC= K scoreboard

  3. T= he connection is not in loss recovery

  4. The most recently transmitted data was not itself= a TLP probe (i.e. a sender MUST NOT send consecutive or back-to-back TLP p= robes).


If a PTO can be scheduled according to these conditions, the sender shou= ld schedule a PTO. If there was a previously scheduled PTO or RTO pending, = then that pending PTO or RTO should first be cancelled, and then the new PT= O should be scheduled.


If a PTO cannot be scheduled according to these conditions, then th= e sender MUST arm the RTO timer if there is unacknowledged data in flight.<= /span>


----

How does = that sound?

Praveen, thank you again for all these excellent questions and points= !

chee= rs,
neal

--000000000000fdf30c056bcbba45-- From nobody Thu May 10 08:51:08 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 38F6C12D93F for ; Thu, 10 May 2018 08:51:07 -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, RCVD_IN_DNSWL_NONE=-0.0001, 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 5Zr03dz3h2mp for ; Thu, 10 May 2018 08:51:04 -0700 (PDT) Received: from smtpb1.bt.com (smtpb1.bt.com [62.7.242.142]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 08C55126C0F for ; Thu, 10 May 2018 08:51:03 -0700 (PDT) Received: from rew09926dag03c.domain1.systemhost.net (10.55.202.26) by EVMED06-UKBR.bt.com (10.216.161.38) with Microsoft SMTP Server (TLS) id 14.3.319.2; Thu, 10 May 2018 16:50:59 +0100 Received: from rew09926dag03b.domain1.systemhost.net (10.55.202.22) by rew09926dag03c.domain1.systemhost.net (10.55.202.26) with Microsoft SMTP Server (TLS) id 15.0.1293.2; Thu, 10 May 2018 16:51:01 +0100 Received: from rew09926dag03b.domain1.systemhost.net ([fe80::d514:fe50:560c:401e]) by rew09926dag03b.domain1.systemhost.net ([fe80::d514:fe50:560c:401e%12]) with mapi id 15.00.1293.004; Thu, 10 May 2018 16:51:01 +0100 From: To: Thread-Topic: [tcpm] I-D Action: draft-ietf-tcpm-converters-01.txt Thread-Index: AQHTtK4iDI+Mo6jxv0utHg3D/M2BoKQpg4Tw Date: Thu, 10 May 2018 15:51:00 +0000 Message-ID: <718b17025c25456490724ad442040422@rew09926dag03b.domain1.systemhost.net> References: <152027380186.14624.8843516061240272538@ietfa.amsl.com> In-Reply-To: <152027380186.14624.8843516061240272538@ietfa.amsl.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.55.202.232] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [tcpm] I-D Action: draft-ietf-tcpm-converters-01.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, 10 May 2018 15:51:07 -0000 Hi, I remember in the London discussion there were some comments about things i= t would be good to add to the draft - mainly about more examples. I agree w= ith this, it would be useful I think to cover: - The example is for one client. I assume multiple clients each require the= ir own Ipv6 address on the converter (ie which is the source address for th= at client's converter-server(s) connections)? - How would the client access Ipv4 content? - I assume the client has to be configured somehow with the converter's add= ress - What happens if the converter fails? I suppose the client has to somehow = notice, and (at config time) it gets told the address for a back-up convert= er or a DNS name.=20 - What happens if a link fails? I assume if one of the client-converter lin= ks fails, then MPTCP shifts all the traffic to the other path. If the conve= rter-server connection fails, how does the client discover this? I assume p= ackets build up at the converter and are dropped, and at some point the con= verter informs the client.=20 Thanks, Best wishes, phil -----Original Message----- From: tcpm [mailto:tcpm-bounces@ietf.org] On Behalf Of internet-drafts@ietf= .org Sent: 05 March 2018 18:17 To: i-d-announce@ietf.org Cc: tcpm@ietf.org Subject: [tcpm] I-D Action: draft-ietf-tcpm-converters-01.txt A New Internet-Draft is available from the on-line Internet-Drafts director= ies. 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=3Ddraft-ietf-tcpm-converters-01 Please note that it may take a couple of minutes from the time of submissio= n 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 May 10 16:08:08 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 084B112E037 for ; Thu, 10 May 2018 16:08:07 -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, 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 im3TqhOSCgv2 for ; Thu, 10 May 2018 16:08:04 -0700 (PDT) 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 1564712DB72 for ; Thu, 10 May 2018 16:08:03 -0700 (PDT) Received: from mail-it0-f51.google.com (mail-it0-f51.google.com [209.85.214.51]) by mail.sfc.wide.ad.jp (Postfix) with ESMTPSA id B66532783BF for ; Fri, 11 May 2018 08:08:01 +0900 (JST) Received: by mail-it0-f51.google.com with SMTP id 70-v6so2696ity.2 for ; Thu, 10 May 2018 16:08:01 -0700 (PDT) X-Gm-Message-State: ALKqPwf02LgOTkX/inoxsmLZwKxYjhahRPB5fI9dZTpd0HgloRf5x7gK rR5t6EToTjDO0KMhRdVy+pfhCyjz/2LowNEsXpE= X-Google-Smtp-Source: AB8JxZo1kFcdGleZtXelX9yNXwxz0QI2cLWcmPhHQg6awehdQ6s5Tn76SsLLZSuCXGeUJqorfp0v6JYlFaN9JYwF/VY= X-Received: by 2002:a24:3555:: with SMTP id k82-v6mr934243ita.49.1525993680601; Thu, 10 May 2018 16:08:00 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a4f:43c6:0:0:0:0:0 with HTTP; Thu, 10 May 2018 16:08:00 -0700 (PDT) In-Reply-To: References: From: Yoshifumi Nishida Date: Thu, 10 May 2018 16:08:00 -0700 X-Gmail-Original-Message-ID: Message-ID: To: Neal Cardwell Cc: Praveen Balasubramanian , Priyaranjan Jha , "tcpm@ietf.org" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [tcpm] TLP questions 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, 10 May 2018 23:08:07 -0000 Hi Neal, On Wed, May 9, 2018 at 1:27 PM, Neal Cardwell wrote: > On Wed, May 9, 2018 at 2:29 PM Praveen Balasubramanian > wrote: >> >> Including tcpm as this can be a review of the TLP portions of >> draft-ietf-tcpm-rack-03. >> >> >> >> From: Praveen Balasubramanian >> Sent: Tuesday, May 8, 2018 6:13 PM >> To: Yuchung Cheng ; Neal Cardwell >> >> Subject: TLP questions >> >> >> >> Hey folks, I have some questions on draft-ietf-tcpm-rack-03 mainly aroun= d >> TLP. > > > Praveen, thank you for all of these excellent questions, and thanks for > bringing this to the tcpm list for discussion! > >> >> >> >> =E2=80=9COpen state: the sender's loss recovery state machine is in its = normal, >> default state: there are no SACKed sequence ranges in the SACK scoreboa= rd, >> and neither fast recovery, timeout-based recovery, nor ECN-based cwnd >> reduction are underway. =E2=80=9C >> >> Open state is defined and then never used. > > Yes, thanks for noticing. The phrase "Open state" is used in earlier > revisions of the TLP and RACK drafts as a precondition for sending a Tail > Loss Probe. We removed its use in draft-ietf-tcpm-rack-03 but forgot to > remove the definition in draft-ietf-tcpm-rack-03. We noticed shortly afte= r > shipping the -03 text and already removed that definition in our internal > draft for draft-ietf-tcpm-rack-04. > >> >> I assume you require that TLP be scheduled only for connections in open >> state? > > That was the original (and long-time) implementation. The "Open" state is > the Linux TCP stack term for the default congestion control state where > there's nothing in the SACK scoreboard, no ECN cwnd reduction is underway= , > and we're not doing Fast Recovery or RTO recovery. Originally the Linux T= CP > code would only schedule a TLP in the "Open" state. But recently the TCP > team at Google has analyzed scenarios where this limitation seemed too > strict. In particular, we were analyzing a case in the public Linux netde= v > mailling list ("Re: Linux ECN Handling") where the connection was in the > middle of a DCTCP ECN-triggered cwnd reduction, and then suffered a ~300m= s > timeout that would have been vastly shorter if there had been a TLP for > recovery. So we changed the Linux TCP code to allow TLP in ECN-triggered > cwnd reductions (b4f70c3d4ec32 "tcp: allow TLP in ECN CWR"). > > This means that the Linux TCP code is allowing TLP in the ECN cwnd reduct= ion > state as well as the "Open" state. We have tried to update the draft in > draft-ietf-tcpm-rack-03 and, based on your feedback, will try to make thi= s > more crisp/clear in draft-ietf-tcpm-rack-04. Please see below for a propo= sed > update to this part of the text. >> >> I wonder why there is the requirement on =E2=80=9Cno SACKed sequence ran= ges in the >> SACK scoreboard=E2=80=9D. > > This condition dated from the original TLP design, where originally the > motivation was to keep the behavior cautious and simple. Now that we have > RACK, as a practical matter, we still don't really want a TLP in such cas= es. > Rather, if there is some SACKed sequence range but we are not yet in loss > recovery, then typically RACK will install a timer based on the reorderin= g > window, and when that timer fires it will mark some packets lost and ente= r > fast recovery. > > For this reason, the Linux TCP implementation of TLP+RACK still has a "no > SACKed sequence ranges in the SACK scoreboard" as a precondition for > scheduling a TLP, and IMHO this still makes sense, so I would proposed th= at > in draft-ietf-tcpm-rack-04 we document that by adding a clause to the lis= t > of preconditions for scheduling a TLP ("5.4.1. Phase 1: Scheduling a loss > probe... A sender should schedule a PTO only if all of the following > conditions are met"): > > The connection has no SACKed sequences in the SACK scoreboard > > Please see below for where this proposed addition fits into the surroundi= ng > text. >> >> PTO +=3D 2ms >> >> If we already are being conservative by waiting 2*SRTT, then how is addi= ng >> 2 msec going to help? Was this added due to a real world issue? > > Yes, this is due to real-world issues. In datacenters, with Linux TCP the > SRTT could be much lower than 100usec, so even 2*SRTT is a very tight tim= er, > and could result in lots of spurious TLPs, and is not even supported by > current retransmission timer mechanisms in common OSes. So the 2ms is to > allow for real-world jitter in the network and end hosts. We tried to > describe some of these issues in the -03 draft: > > Similarly, current end-system processing latencies and timer > granularities can easily delay ACKs, so senders SHOULD add at least > 2ms to a computed PTO value (and MAY add more if the sending host OS > timer granularity is more coarse than 1ms). > > > I guess we can add network jitter to this as well, so I'd propose somethi= ng > like the following for -04: > > Similarly, network delay variations and end-system processing > latencies and timer granularities can easily delay ACKs beyond 2*SRTT, > so senders SHOULD add at least 2ms to a computed PTO value > (and MAY add more if the sending host OS timer granularity is more > coarse than 1ms). > > Instead of 2ms we could add something like RTTVAR from RFC 6298, but that > would add complexity and delay, especially if the receiver is manifesting > ~200ms delayed ACKs. And so we have not yet seen evidence that that would= be > a good trade-off. > >> =E2=80=9CIf a previously unsent segment exists AND >> >> the receive window allows new data to be sent: >> >> Transmit that new segment >> >> FlightSize +=3D SMSS >> >> Else: >> >> Retransmit the last segment=E2=80=9D >> >> This needs to be crisper about what is meant by =E2=80=9Cpreviously unse= nt=E2=80=9D and >> =E2=80=9Clast segment=E2=80=9D. For example the sender could have sent a= large amount of >> data and then taken a full RTO. In this case if PTO fires, do =E2=80=9Cp= reviously >> unsent=E2=80=9D and =E2=80=9Clast segment=E2=80=9D refer to MSS size seg= ments straddling just before >> and after SND.NXT? OR do they straddle around the largest sent sequence >> number ever in the connection lifetime? > > > Very good questions. I like your suggestion to be crisper in this section= . > The Linux TCP stack does not "rewind" SND.NXT upon RTO, so in the Linux T= CP > stack the SND.NXT point and "largest sent sequence number ever in the > connection lifetime" are basically the same point. That is the framework = in > which we were thinking for those lines. > > In my mind... > > By "a previously unsent segment" we mean basically "the next segment (of = MSS > or fewer bytes) that the sender would normally send if it had available c= wnd > at this time." That is something that presumably every production-quality > TCP stack has very quick access to. > > By "the last segment" we mean "the highest-sequence segment (of MSS or fe= wer > bytes) that has already been transmitted and not ACKed or SACKed." I imag= ine > this should also be generally very quick to access (at least it can be > quickly accessed in two generations of the Linux TCP write queue). Let us > know if not, and we can discuss. > > Does that help clarify those parts? If so, we can update the text to > incorporate something like that (suggestions?). I am thinking that we can just say "send one (SMSS or smaller) segment that contains up to highest sequence number it has sent." I am a bit wondering if not ACKed or SACKed requirement should be mandatory, although it will be a bit redundant. >> >> =E2=80=9COn each incoming ACK, the sender should cancel any existing los= s probe >> timer.=E2=80=9D >> >> Even on duplicate ACKs? > > Excellent question. This line is out of date, and does not reflect recent > fixes our team made in the Linux TCP stack (df92c8394e6e "tcp: fix xmit > timer to only be reset if data ACKed/SACKed"). In fact the TLP/RTO timer= s > should only be rearmed (cancelled and reinstalled at a later time) if > certain kinds of real "forward progress" are made. On our internal draft = for > -04 I have proposed we change this to: > > Phase 3: ACK processing > > On each incoming ACK, the sender should check the conditions in Step 1 = of > Phase 1 to see if it should schedule (or reschedule) the loss probe timer= . > > And then, putting this all together, I would propose something like the > following text for Step 1 of Phase 1: > > ---- > > Phase 1: Scheduling a loss probe > > > Step 1: Check conditions for scheduling a PTO. > > A sender should check to see if it should schedule a PTO in the following > situations: > > After transmitting new data > > Upon receiving an ACK that cumulatively acknowledges data > > Upon receiving a SACK that selectively acknowledges data that was last se= nt > before the segment with SEG.SEQ=3DSND.UNA was last (re)transmitted > > > A sender should schedule a PTO only if all of the following conditions ar= e > met: > > The connection supports SACK [RFC2018] Do we need to check this? I mean RACK already presumes SACK nodes. I thought TLP does as well. Or, do we want to use TLP with non-SACK nodes? > The connection has no SACKed sequences in the SACK scoreboard > > The connection is not in loss recovery > > The most recently transmitted data was not itself a TLP probe (i.e. a sen= der > MUST NOT send consecutive or back-to-back TLP probes). I think the third condition might be a bit ambiguous and may require another variable. If we check TLPRtxOut and TLPHighRxt, might it be sufficient? -- Yoshi From nobody Thu May 10 16:29:08 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 77F4D12E056 for ; Thu, 10 May 2018 16:29:07 -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_DKIMWL_WL_HIGH=-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=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 Tq8MEFwKgS4T for ; Thu, 10 May 2018 16:29:03 -0700 (PDT) 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"Scharf, Michael (Nokia - DE/Stuttgart)" To: "tcpm@ietf.org" Thread-Topic: Enabling DMARC workaround code for all IETF/IRTF mailing lists Thread-Index: AQHT6R4CMQODohl6S0i5BdJOGDl0Q6Qqap6Q Date: Fri, 11 May 2018 11:54:02 +0000 Message-ID: References: <919855CA-9F77-420A-8B8F-79174CD2FC19@fastmail.fm> In-Reply-To: <919855CA-9F77-420A-8B8F-79174CD2FC19@fastmail.fm> Accept-Language: en-US, de-DE Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: authentication-results: spf=none (sender IP is ) smtp.mailfrom=michael.scharf@nokia.com; x-originating-ip: [92.203.149.190] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; AM5PR0701MB2979; 7:aEYTjjq490EbuKS/9Tog+FwrxZmjEXfpwwY+iR8+Q14c13j9OGWI9vVS/6PV3TqvXWSo7KXZiWg7VNxzMu2hemqXBXm9akrai1pLSKkWcmDBDLUAHSzmiLGULEw7VoCICFZGPbammQ5AjKt0V8z2D+fxNocfFJ8FJRppRaD6hk+th6N12nlewBHDbG1BfVDW0+c5Ed4fEXdZVbRJcGJncF+pJfOlEmRww0W7h28Sx835TuY8JtpsNM+7UlJIKue8 x-ms-exchange-antispam-srfa-diagnostics: SOS; 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PGCcENf0oujt0zxMMlVjMwbHGsmKekoCQ58NJ805oWaUWlIq5B5d8/phJCfrG7cfWAoLYqwwEVarWFFg+iQqpR5UDalfpym2IVruJY2iJml6oBR+G1EKXz0PwXLOntv8PHw9uZWaI8x0mZNN0BVJTsgL30baprgdpGgYBd9AxIfX/JiLuUjuOIySWOsqT/WGd7KNiuwKkFKtMvRxybZuo4abYqXO8g8gMxJOHDi/694= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Office365-Filtering-Correlation-Id: 72952bd9-4905-4862-bf15-08d5b735e3ac X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 72952bd9-4905-4862-bf15-08d5b735e3ac X-MS-Exchange-CrossTenant-originalarrivaltime: 11 May 2018 11:54:02.2170 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0701MB2979 Archived-At: Subject: [tcpm] FW: Enabling DMARC workaround code for all IETF/IRTF mailing lists 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, 11 May 2018 11:54:07 -0000 FYI I believe that, unfortunately, some TCPM list subscribers had issues with t= his in the past, and e.g. got unsubscribed. That was never a TCPM-specific = problem. I am myself not familiar with the technical details, and TCPM is not the ri= ght list to discuss this... Michael -----Original Message----- From: ietf [mailto:ietf-bounces@ietf.org] On Behalf Of Alexey Melnikov Sent: Friday, May 11, 2018 2:00 PM To: ietf@ietf.org Subject: Enabling DMARC workaround code for all IETF/IRTF mailing lists Hi, Many of you have seen several long discussions thread about DMARC and how i= t affects use of IETF/IRTF mailing lists. After testing DMARC workaround code written by Henrik Levkowetz on several = high volume IETF and IRTF mailing lists (e.g. CFRG, WebRTC, DMARC, QUIC), t= he tools team and the IESG decided that Henrik's code should be deployed fo= r all IETF and IRTF mailing lists. In particular the workaround allows peop= le from DMARC p=3Dreject domains to participate in IETF mailing lists, as w= ell as to avoid the problem of recipients being unsubscribed from mailing l= ists. These 2 issues were the main reasons for developing the DMARC workaro= und code.. The workaround will be deployed today, May 11th. Below are some technical details on how the email address rewriting workaro= und is going to work: Emails from domains that don't have a p=3Dreject DMARC setting are not goin= g to be affected in any way. For emails from p=3Dreject domains: - The From header field of such emails will be rewritten to be under @dmarc= .ietf.org domain (which will have a p=3Dnone policy). For example, "alexey@= example.com" email address would become "alexey=3D40example.com@dmarc.ietf.= org". The original From header field will be preserved in the X-Original-Fr= om header field, which can be used for automatic message processing by Siev= e and Mail User Agents. Note that the mapping is reversible, so it is possible to send replies or n= ew messages to an original sender by sending them to the corresponding mapp= ed @dmarc.ietf.org email address. Best Regards, Alexey From nobody Mon May 14 14:21:59 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 6856C126D73 for ; Mon, 14 May 2018 14:21:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -18.211 X-Spam-Level: X-Spam-Status: No, score=-18.211 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_DKIMWL_WL_MED=-0.01, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5] 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 GmVXMBeXcP2I for ; Mon, 14 May 2018 14:21:56 -0700 (PDT) Received: from mail-wm0-x22e.google.com (mail-wm0-x22e.google.com [IPv6:2a00:1450:400c:c09::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 2CFB312E8A5 for ; Mon, 14 May 2018 14:21:56 -0700 (PDT) Received: by mail-wm0-x22e.google.com with SMTP id f6-v6so15930466wmc.4 for ; Mon, 14 May 2018 14:21:56 -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:content-transfer-encoding; bh=SnTlW92h8QWC1s5iZugEdiCN9x/Txb2k8zopJdnGWs8=; b=ckEvLmWSECKtYfcxfaU0LeL3N9D4wrOjZBXgxkco6HFw9nj7OoV75Xe+PfTmxi6MXz 7h2Th0gf4OqCk1m2KDSrz13ZjcV50xYbJDxMW9AsXW6SLQOLONbsLgJ14/MOhnA9Ydlc JtK0HJTE2e8nyZ1hbvEAyvDAte3Evb0dFyfR6RkJ99WQ3xhF6+J5Hh5ejVBdvDecTrSu 9vyTVStXw3fqBeTpuXMW80UwFzoqRYXwAmBab7u3A0lYYP+SOUW8nbEcmg0CN6oEdlPk G5HPy+7jS2fGsmx9Ou6GMu6F0soCWEOzOXqrdvY5ses84IIFrZs9J41/bnt9qDrwq5sd 2FEg== 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:content-transfer-encoding; bh=SnTlW92h8QWC1s5iZugEdiCN9x/Txb2k8zopJdnGWs8=; b=oylXuzoWQkF91qQPK8nEZ3ociF0AUJ6WvZHk3Pk+4NL2coFQWXQNUQ4guBIDWmGgkn qoiAhGdgmOcDtCC1uBug5oWmueE3x3ZYu2MGyC4zYoxto9cUvVfnDKTs/7V+y//4nLPR D+LEUVCXyOP1j8Mi4B0+N109rFHcZYWRthiYnPEyTaHR+deQg2E5kiyEDGcZbZzVZgeI 0hB+1zbEZF+4Lfm/OIclDOWjBxYt1gFg6wQf40L7y9ujglYy4nX2yYyYDLvfWDaLBQS2 WFUM9yByosteD1zFkQtK2JpiUKTKheVkKzXO9LIbrQ1/ekxmegC6MOol2vF94dyW02TU sdqA== X-Gm-Message-State: ALKqPwe7Ei3knq2/73VfeL14dBXl8rPFrqRUVXAKec7Pz9sGpWJHGUfv OzAORDn3Wk1gEp29NbAvOP7EG4TXlDrkkBQMXGJ+gQ== X-Google-Smtp-Source: AB8JxZpsmIMw9abcq31r/lx/34B5ZKa/yB1PFoqVhNrAJDdjL5493qi5YFC+mlnDY0kjNnhOWv0OXHh4+XCTbGbD/zY= X-Received: by 2002:a1c:ecc5:: with SMTP id h66-v6mr5767330wmi.147.1526332914318; Mon, 14 May 2018 14:21:54 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Neal Cardwell Date: Mon, 14 May 2018 17:21:36 -0400 Message-ID: To: Yoshifumi Nishida Cc: Praveen Balasubramanian , Priyaranjan Jha , "tcpm@ietf.org" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [tcpm] TLP questions 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, 14 May 2018 21:21:58 -0000 On Thu, May 10, 2018 at 7:08 PM Yoshifumi Nishida wrote: > Hi Neal, > On Wed, May 9, 2018 at 1:27 PM, Neal Cardwell wrote: > > On Wed, May 9, 2018 at 2:29 PM Praveen Balasubramanian < pravb@microsoft.com> ... > >> =E2=80=9CIf a previously unsent segment exists AND > >> > >> the receive window allows new data to be sent: > >> > >> Transmit that new segment > >> > >> FlightSize +=3D SMSS > >> > >> Else: > >> > >> Retransmit the last segment=E2=80=9D > >> > >> This needs to be crisper about what is meant by =E2=80=9Cpreviously un= sent=E2=80=9D and > >> =E2=80=9Clast segment=E2=80=9D. For example the sender could have sent= a large amount of > >> data and then taken a full RTO. In this case if PTO fires, do =E2=80=9Cpreviously > >> unsent=E2=80=9D and =E2=80=9Clast segment=E2=80=9D refer to MSS size s= egments straddling just before > >> and after SND.NXT? OR do they straddle around the largest sent sequence > >> number ever in the connection lifetime? > > > > > > Very good questions. I like your suggestion to be crisper in this section. > > The Linux TCP stack does not "rewind" SND.NXT upon RTO, so in the Linux TCP > > stack the SND.NXT point and "largest sent sequence number ever in the > > connection lifetime" are basically the same point. That is the framework in > > which we were thinking for those lines. > > > > In my mind... > > > > By "a previously unsent segment" we mean basically "the next segment (of MSS > > or fewer bytes) that the sender would normally send if it had available cwnd > > at this time." That is something that presumably every production-quality > > TCP stack has very quick access to. > > > > By "the last segment" we mean "the highest-sequence segment (of MSS or fewer > > bytes) that has already been transmitted and not ACKed or SACKed." I imagine > > this should also be generally very quick to access (at least it can be > > quickly accessed in two generations of the Linux TCP write queue). Let us > > know if not, and we can discuss. > > > > Does that help clarify those parts? If so, we can update the text to > > incorporate something like that (suggestions?). > I am thinking that we can just say "send one (SMSS or smaller) segment > that contains up to highest sequence number it has sent." > I am a bit wondering if not ACKed or SACKed requirement should be > mandatory, although it will be a bit redundant. Yes, good point; the "not ACKed or SACKed" I added in my email message was redundant. So we could replace: "Retransmit the last segment" with: "Retransmit the highest-sequence segment sent so far" > > A sender should schedule a PTO only if all of the following conditions are > > met: > > > > The connection supports SACK [RFC2018] > Do we need to check this? I mean RACK already presumes SACK nodes. I > thought TLP does as well. > Or, do we want to use TLP with non-SACK nodes? Yes, both RACK and TLP require SACK. I agree that it could be considered redundant to specify the SACK dependency in the TLP section, given that we have already mentioned in section "3. Requirements" that RACK depends on SACK. But IMHO it is worthwhile to keep this dependency separately listed here for TLP, to try to make it clear/explicit that the TLP algorithm has its own dependency on SACK. > > The connection has no SACKed sequences in the SACK scoreboard > > > > The connection is not in loss recovery > > > > The most recently transmitted data was not itself a TLP probe (i.e. a sender > > MUST NOT send consecutive or back-to-back TLP probes). > I think the third condition might be a bit ambiguous and may require > another variable. If we check TLPRtxOut and TLPHighRxt, might it be > sufficient? Yes, I agree this condition is not as clear as it should be. There are really several considerations: (a) we don't want an unterminating chain of TLPs, where after sending a TLP probe we rearm the PTO timer and send another TLP (b) we can't allow multiple outstanding TLP retransmissions (Checking TLPRxtOut would cover (b) but not (a). And checking TLPRxtOut is discussed elsewhere in the draft.) The way the Linux TCP TLP code handles this as follows: For (a), we ensure this structurally in the call sequence: after sending a TLP probe, we rearm the RTO timer, not the TLP timer. This is already discussed in the section "Phase 2: Sending a loss probe". For (b), before sending a TLP retransmission we effectively check TLPRxtOut and do not send a TLP at all if there is an outstanding TLP retransmission. This is already discussed in "Recording loss probe states". Given that those issues are already discussed elsewhere, I'd propose to remove that line "The most recently transmitted data was not itself a TLP probe (i.e. a sender MUST NOT send consecutive or back-to-back TLP probes).". Instead in the -04 draft I'd propose we just add a brief note at the end of the "Phase 2: Sending a loss probe" section: Note that after transmitting a TLP, the sender MUST arm an RTO timer, and not the PTO timer. This ensures that the sender does not send repeated, back-to-back TLP probes. Thank you, Yoshifumi! neal From nobody Mon May 14 20:00:16 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 56D73127863 for ; Mon, 14 May 2018 20:00:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -18.21 X-Spam-Level: X-Spam-Status: No, score=-18.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_DKIMWL_WL_MED=-0.01, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5] 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 wtIzIw_dwvEr for ; Mon, 14 May 2018 20:00:11 -0700 (PDT) Received: from mail-wm0-x22a.google.com (mail-wm0-x22a.google.com [IPv6:2a00:1450:400c:c09::22a]) (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 90FED127909 for ; Mon, 14 May 2018 20:00:11 -0700 (PDT) Received: by mail-wm0-x22a.google.com with SMTP id a137-v6so14027941wme.1 for ; Mon, 14 May 2018 20:00:11 -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=MS84zMgBOxA4NeFhctStT3WYd4RCTlq8W2CPUHvlsc0=; b=oc6C3NUTYO3pSO/NWzVDeFo199KmoLc5CDrADLtqNBy233NFcq0ggAEHWJdm3x1n0x 1dctD36tPxUW1M/32swauM2T8XNkcKM6ZU1otBZf5T3IV1fszdZGMS3c3wQVZzGF3mwd TJuZ1sTJFxrCIiIrXX4bqw3quL6FOBd4QftIQ7la8w7MwEsDDTX5L6ac5/+DdraPXjAL kO1QCT8aGfOmwKCilEgAHYRb+2TxxMMpDZrsBUQzmVanwGL4kdvy1APQcfcnnj7qTdoQ EOA2h9orbKMmuC3dEqwk4bbyI9wFiF1TI+L2ymEdudLixZL8OSh2WiqNQV6v9ZKbnh5K p6UQ== 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=MS84zMgBOxA4NeFhctStT3WYd4RCTlq8W2CPUHvlsc0=; b=kxfOeSwm7/wU9xE6MLvMOxQP6EWTBX5xaxCW0lz+YoBgPAzKIX8zasgDktpYmDkYA8 4Vu5WjCn6oCpdrSicPk4/VlVvjepZtOBwTlKi+XUJ4TywIETPPyd1zCO2nSty/QiMYab ADMObMGWIuhFWHHgEMSkz0xIYU1aeVODCF2i8WeX2N1u58axaZr62tSLH+j7tsYxrhb4 UGcg8BUIyf8BT6WdGrZEJPFIxiA5wIZth0eivpX6dI7EytY93Nt7SYiRipV6SrjVqZht IkfdQcOi0u47vP29pJD8U2X7rjK9J39pGmHPiD1tOtwTOxxW/GCNDYtO5f8JLl2z5zb1 9HTg== X-Gm-Message-State: ALKqPwedxwjhMfDnL5tBvcwLOGRZ1KxHqyMi01TMgpmEm/JzHK1RXzF/ jEJ3z7tX25ZPVTD6P9ulm639g19xramI0Xjx1yWOuw== X-Google-Smtp-Source: AB8JxZp4xRoHFyw68Hqm+EzjmVMera+FfhX578pHQwekwfBwdvshiGT/YErRLIDgS9h92LDNXO7uDDHSa5ijGoqO+0M= X-Received: by 2002:a1c:a750:: with SMTP id q77-v6mr6378698wme.111.1526353209659; Mon, 14 May 2018 20:00:09 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Neal Cardwell Date: Mon, 14 May 2018 22:59:51 -0400 Message-ID: To: Praveen Balasubramanian Cc: Yuchung Cheng , "tcpm@ietf.org" , Nandita Dukkipati , Priyaranjan Jha Content-Type: text/plain; charset="UTF-8" Archived-At: Subject: Re: [tcpm] TLP questions 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, 15 May 2018 03:00:14 -0000 On Thu, May 10, 2018 at 7:29 PM Praveen Balasubramanian wrote: > Thanks Neal for the detailed response along with the historical context. Looking forward to draft 04 updates. > A few more questions and comments. Thanks again for another round of excellent questions and comments. :-) > > then typically RACK will install a timer based on the reordering > > window, and when that timer fires it will mark some packets lost > > and enter fast recovery > The "reordering settling" timer is defined as optional in the draft. > The Windows implementation currently does not use this timer. > Until we add such a timer, we plan to not prevent TLP even if SACK > scoreboard is not empty. However if recovery is triggered, we'll > cancel the PTO and arm an RTO. Do you see any issues with this > approach? Since the draft makes the "reordering settling" > timer optional, I think it should suggest this alternative approach. That sounds to me like it would work OK. But IMHO it sounds like it's missing out on the opportunity to use a reordering timer to speed up fast recovery quite a bit by initiating a RACK-based recovery using the reordering timer. That scenario sounds like: + send the original flight of data + 1*srtt passes + receive 1 or 2 SACKs for packets in that flight, schedule TLP + wait 2*srtt + TLP timer fires, send TLP + 1*srtt passes + receive SACK of TLP, initiate RACK-based fast recovery If there's a reordering timer, this could be: + send the original flight of data + 1*srtt passes + receive 1 or 2 SACKs for packets in that flight, schedule TLP + wait 0.25*min_rtt + reordering timer fires, initiate RACK-based fast recovery With the reordering timer, AFAICT it takes about 2.75*srtt less time before the recovery begins, if I correctly noted all the details. > > So the 2ms is to allow for real-world jitter in the network and end hosts > Currently the Windows implementation doesn't use TLP and RACK for > connections with < 10 msec RTT. So until we change this logic, > we will skip adding the 2 ms jitter protection. Skipping the 2ms jitter protection sounds OK in that case. Are TLP and RACK skipped in the <10ms case due to the granularity of the send and ACK timestamps, or the granularity of the timers, or both? I could imagine that there could be some nice latency improvements from using TLP and RACK at those low RTTs, as long as any timers that were scheduled were rounded up appropriately (e.g. by 10ms-20ms). But I haven't fully thought through all the implications of this kind of scenario. > > By "a previously unsent segment" we mean basically > > "the next segment (of MSS or fewer bytes) that the sender > > would normally send if it had available cwnd at this time > This is better but still not crisp enough to determine what > exactly the Linux implementation does. Since you said that > Linux does not roll back SND.NXT upon RTO, does this imply > that "a previously unsent segment", is the one starting at SND.NXT? Yes, for the Linux TLP sender, "a previously unsent segment" is the one starting at SND.NXT. BTW, F-RTO RFC - https://tools.ietf.org/html/rfc5682 - in section 2.1 2) b), in describing its similar "forward" probe packets, uses the phrase "transmit up to two new (previously unsent) segments". So for consistency with the F-RTO text I have tentatively changed that line in our internal draft of -04 from: "Transmit that new segment" to: "Transmit one new (previously unsent) segment" It is probably worth noting here that in the Linux TCP stack the sender would not send a TLP when in the middle of an RTO-triggered recovery. This corresponds to one of the conditions in the draft, in section "5.4.1. Phase 1: Scheduling a loss probe": the condition that says: " 2. The connection is not in loss recovery" So perhaps because of this the different SND.NXT "rewind" behavior of different TCP stacks upon RTO may not matter ultimately? Or perhaps there are more implications to unpack. :-) > > By "the last segment" we mean "the highest-sequence segment > > (of MSS or fewer bytes) that has already been transmitted > > and not ACKed or SACKed > Again given that SND.NXT is not rolled back this would presumably > the first UN(S)ACKed MSS or fewer bytes walking back from SND.NXT > (I am not suggesting an actual walk back, just for illustration). Yes, exactly. > I am a bit confused that you used the "or SACKed" since you > previously required that PTO not be armed if any SACK blocks > were present. If that is followed, then "the last segment" would > pretty much always be MSS or fewer bytes just before > (non-rolled back) SND.NXT. Yes, you are exactly right. I should have left the "or SACKed" part out of that line in my e-mail. :-) By the way, regarding retransmitting the "last segment", this discussion made me realize that AFAICT the draft did not yet discuss why the TLP retransmission is the last segment. I have added some proposed text to our internal draft of the -04 rev to try to describe the rationale: "When the loss probe is a retransmission, the sender uses the highest-sequence segment sent so far. This is in order to deal with the retransmission ambiguity problem in TCP. Suppose a sender sends N segments, and then retransmits the last segment (segment N) as a loss probe, and then the sender receives a SACK for segment N. As long as the sender waits for any required RACK reordering settling timer to then expire, it doesn't matter if that SACK was for the original transmission of segment N or the TLP retransmission; in either case the arrival of the SACK for segment N provides evidence that the segments preceding segment N were likely lost." Of course welcome comments/suggestions about this proposed paragraph as well. Thanks! neal From nobody Thu May 17 00:07:59 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 9712F126C19; Thu, 17 May 2018 00:07:56 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: =?utf-8?q?Michael_T=C3=BCxen?= To: X-Test-IDTracker: no X-IETF-IDTracker: 6.80.0 Auto-Submitted: auto-generated Precedence: bulk Cc: tuexen@fh-muenster.de, =?utf-8?q?Michael_T=C3=BCxen?= , tcpm@ietf.org, iesg-secretary@ietf.org, tcpm-chairs@ietf.org Message-ID: <152654087661.7607.11833442988744897883.idtracker@ietfa.amsl.com> Date: Thu, 17 May 2018 00:07:56 -0700 Archived-At: Subject: [tcpm] Publication has been requested for draft-ietf-tcpm-alternativebackoff-ecn-07 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, 17 May 2018 07:07:57 -0000 Michael Tüxen has requested publication of draft-ietf-tcpm-alternativebackoff-ecn-07 as Experimental on behalf of the TCPM working group. 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roiN6X8CUOjs4J5HHzlQ0IgXRyayAK2ypSv7hAy2AWJoHU4RetnLeKvyGyb/Uvrvb418GL0gYx/ZziDPDcF3CCHz4jOL6yBJ0LbQOfYcch6gVXSjTkn0BLp7+2U5Vum5LHq9iajmbNQLkpKxJKWaQ3xB63ba9Ulb5z5tb1ywMwEcWs/JjJmEwPYTside2VD5 spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-MS-Office365-Filtering-Correlation-Id: 61f469f9-bf37-4b9c-3f70-08d5bd179bd8 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 61f469f9-bf37-4b9c-3f70-08d5bd179bd8 X-MS-Exchange-CrossTenant-originalarrivaltime: 18 May 2018 23:32:23.7829 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0631 Archived-At: Subject: Re: [tcpm] TLP questions X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , 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To: Praveen Balasubramanian Cc: Neal Cardwell , "tcpm@ietf.org" , Nandita Dukkipati , Priyaranjan Jha , Matt Olson Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [tcpm] TLP questions 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, 19 May 2018 16:28:22 -0000 On Fri, May 18, 2018 at 4:32 PM, Praveen Balasubramanian wrote: >> Are TLP and RACK skipped in the <10ms case due to the granularity of the= send and ACK timestamps, or the granularity of the timers, or both? >> I could imagine that there could be some nice latency improvements from = using TLP and RACK at those low RTTs, as long as any timers that were sched= uled were rounded up appropriately (e.g. by 10ms-20ms). >> But I haven't fully thought through all the implications of this kind of= scenario. > Both but primarily due to timer granularity. I'd be interested to know if= RACK/TLP in Linux is working well on mobile devices where I assume the tim= er isn=E2=80=99t as fine grained. If the loss recovery is based on "time", and the time measurement is bad, then it simply won't work well. RACK is designed for modern stack that equipped w/ good clocks and per-pkt timestamps. We can probably make that more clear in the draft. > >> It is probably worth noting here that in the Linux TCP stack the sender = would not send a TLP when in the middle of an RTO-triggered recovery. > Windows stack exits recovery upon an RTO but keep track of the highest se= nt sequence number (SND.NXT value before the rewind). So it can do what Lin= ux is doing post RTO. However I am not convinced if there is a safety issue= with allowing TLP post an RTO. I can think of four cases that triggered th= e RTO: forward path loss, reverse path (ACK) loss, and a large RTT increase= beyond RTO. It seems like if there is further loss for new data in slow st= art post RTO, then TLP may help in all cases except the RTT increase case. = I get the part about implementation convenience to disallow TLP during all = recovery, but do you see a safety issue? I don't see a safety issue. It's certain worth considering to include post-timeout phase, especially if TLP is new data to avoid packet ambiguity issue. hmm maybe we can implement that in Linux... > > -----Original Message----- > From: Neal Cardwell [mailto:ncardwell@google.com] > Sent: Monday, May 14, 2018 8:00 PM > To: Praveen Balasubramanian > Cc: Yuchung Cheng ; tcpm@ietf.org; Nandita Dukkipati <= nanditad@google.com>; Priyaranjan Jha > Subject: Re: TLP questions > > On Thu, May 10, 2018 at 7:29 PM Praveen Balasubramanian > wrote: > >> Thanks Neal for the detailed response along with the historical context. > Looking forward to draft 04 updates. > > > >> A few more questions and comments. > > Thanks again for another round of excellent questions and comments. :-) > >> > then typically RACK will install a timer based on the reordering >> > window, and when that timer fires it will mark some packets lost and >> > enter fast recovery > >> The "reordering settling" timer is defined as optional in the draft. >> The Windows implementation currently does not use this timer. >> Until we add such a timer, we plan to not prevent TLP even if SACK >> scoreboard is not empty. However if recovery is triggered, we'll >> cancel the PTO and arm an RTO. Do you see any issues with this >> approach? Since the draft makes the "reordering settling" >> timer optional, I think it should suggest this alternative approach. > > That sounds to me like it would work OK. But IMHO it sounds like it's mis= sing out on the opportunity to use a reordering timer to speed up fast reco= very quite a bit by initiating a RACK-based recovery using the reordering t= imer. > > That scenario sounds like: > > + send the original flight of data > + 1*srtt passes > + receive 1 or 2 SACKs for packets in that flight, schedule TLP wait > + 2*srtt TLP timer fires, send TLP 1*srtt passes receive SACK of TLP, > + initiate RACK-based fast recovery > > If there's a reordering timer, this could be: > > + send the original flight of data > + 1*srtt passes > + receive 1 or 2 SACKs for packets in that flight, schedule TLP wait > + 0.25*min_rtt reordering timer fires, initiate RACK-based fast > + recovery > > With the reordering timer, AFAICT it takes about 2.75*srtt less time befo= re the recovery begins, if I correctly noted all the details. > >> > So the 2ms is to allow for real-world jitter in the network and end > hosts > >> Currently the Windows implementation doesn't use TLP and RACK for >> connections with < 10 msec RTT. So until we change this logic, we will >> skip adding the 2 ms jitter protection. > > Skipping the 2ms jitter protection sounds OK in that case. > > Are TLP and RACK skipped in the <10ms case due to the granularity of the = send and ACK timestamps, or the granularity of the timers, or both? > I could imagine that there could be some nice latency improvements from u= sing TLP and RACK at those low RTTs, as long as any timers that were schedu= led were rounded up appropriately (e.g. by 10ms-20ms). > But I haven't fully thought through all the implications of this kind of = scenario. > >> > By "a previously unsent segment" we mean basically "the next segment >> > (of MSS or fewer bytes) that the sender would normally send if it >> > had available cwnd at this time > >> This is better but still not crisp enough to determine what exactly >> the Linux implementation does. Since you said that Linux does not roll >> back SND.NXT upon RTO, does this imply that "a previously unsent >> segment", is the one starting at SND.NXT? > > Yes, for the Linux TLP sender, "a previously unsent segment" is the one s= tarting at SND.NXT. > > BTW, F-RTO RFC - https://na01.safelinks.protection.outlook.com/?url=3Dhtt= ps%3A%2F%2Ftools.ietf.org%2Fhtml%2Frfc5682&data=3D02%7C01%7Cpravb%40microso= ft.com%7C88aec2962f4c4782e54208d5ba0ff9ca%7C72f988bf86f141af91ab2d7cd011db4= 7%7C1%7C0%7C636619500137896021&sdata=3Dmfd2Dun3d2dcamWx5xmLCsuZzEWiDNlqTJgX= rc7LQQ8%3D&reserved=3D0 - in section 2.1 2) b), in describing its similar "= forward" probe packets, uses the phrase "transmit up to two new (previously= unsent) segments". > So for consistency with the F-RTO text I have tentatively changed that li= ne in our internal draft of -04 from: > "Transmit that new segment" > to: > "Transmit one new (previously unsent) segment" > > It is probably worth noting here that in the Linux TCP stack the sender w= ould not send a TLP when in the middle of an RTO-triggered recovery. > This corresponds to one of the conditions in the draft, in section "5.4.1= . Phase 1: Scheduling a loss probe": the condition that says: > " 2. The connection is not in loss recovery" > > So perhaps because of this the different SND.NXT "rewind" behavior of dif= ferent TCP stacks upon RTO may not matter ultimately? Or perhaps there are = more implications to unpack. :-) > >> > By "the last segment" we mean "the highest-sequence segment (of MSS >> > or fewer bytes) that has already been transmitted and not ACKed or >> > SACKed > >> Again given that SND.NXT is not rolled back this would presumably the >> first UN(S)ACKed MSS or fewer bytes walking back from SND.NXT (I am >> not suggesting an actual walk back, just for illustration). > > Yes, exactly. > >> I am a bit confused that you used the "or SACKed" since you previously >> required that PTO not be armed if any SACK blocks were present. If >> that is followed, then "the last segment" would pretty much always be >> MSS or fewer bytes just before (non-rolled back) SND.NXT. > > Yes, you are exactly right. I should have left the "or SACKed" part out o= f that line in my e-mail. :-) > > By the way, regarding retransmitting the "last segment", this discussion = made me realize that AFAICT the draft did not yet discuss why the TLP retra= nsmission is the last segment. I have added some proposed text to our inter= nal draft of the -04 rev to try to describe the rationale: > > "When the loss probe is a retransmission, the sender uses the highest-seq= uence segment sent so far. This is in order to deal with the retransmission= ambiguity problem in TCP. Suppose a sender sends N segments, and then retr= ansmits the last segment (segment N) as a loss probe, and then the sender r= eceives a SACK for segment N. As long as the sender waits for any required = RACK reordering settling timer to then expire, it doesn't matter if that SA= CK was for the original transmission of segment N or the TLP retransmission= ; in either case the arrival of the SACK for segment N provides evidence th= at the segments preceding segment N were likely lost." > > Of course welcome comments/suggestions about this proposed paragraph as w= ell. > > Thanks! > > neal From nobody Sun May 20 19:03:28 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 9E029120724 for ; Sun, 20 May 2018 19:03:26 -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 HiM6JDIcCQxd for ; Sun, 20 May 2018 19:03:24 -0700 (PDT) Received: from mail.sfc.wide.ad.jp (shonan.sfc.wide.ad.jp [IPv6:2001:200:0:8803::53]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C76E0120713 for ; Sun, 20 May 2018 19:03:23 -0700 (PDT) Received: from mail-it0-f52.google.com (mail-it0-f52.google.com [209.85.214.52]) by mail.sfc.wide.ad.jp (Postfix) with ESMTPSA id D621727831F for ; Mon, 21 May 2018 11:03:20 +0900 (JST) Received: by mail-it0-f52.google.com with SMTP id c3-v6so19437147itj.4 for ; Sun, 20 May 2018 19:03:20 -0700 (PDT) X-Gm-Message-State: ALKqPwenUQ+L6BGQ6t+zd5nYRQlzyZMzLSrT7aaMFQUVn53U99XVNrLv gOHw/jPd2zR90Jcrp0D0ut19/KimLY9GQGLLJpQ= X-Google-Smtp-Source: AB8JxZqM3mMZ24ItpZaWfC/BCOwQYeU3jVBahffUjccjUZXQ/pHxsMlaZbGOFP6BY26s5ZM3kU7ayq6RBlp0p/sHc24= X-Received: by 2002:a24:61c3:: with SMTP id s186-v6mr16914017itc.143.1526868199707; Sun, 20 May 2018 19:03:19 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a4f:1181:0:0:0:0:0 with HTTP; Sun, 20 May 2018 19:03:19 -0700 (PDT) In-Reply-To: References: From: Yoshifumi Nishida Date: Sun, 20 May 2018 19:03:19 -0700 X-Gmail-Original-Message-ID: Message-ID: To: Neal Cardwell Cc: Yoshifumi Nishida , Praveen Balasubramanian , Priyaranjan Jha , "tcpm@ietf.org" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [tcpm] TLP questions 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, 21 May 2018 02:03:27 -0000 Hi Neal, On Mon, May 14, 2018 at 2:21 PM, Neal Cardwell wrote= : > On Thu, May 10, 2018 at 7:08 PM Yoshifumi Nishida > wrote: > >> Hi Neal, > >> On Wed, May 9, 2018 at 1:27 PM, Neal Cardwell > wrote: >> > On Wed, May 9, 2018 at 2:29 PM Praveen Balasubramanian < > pravb@microsoft.com> > ... >> >> =E2=80=9CIf a previously unsent segment exists AND >> >> >> >> the receive window allows new data to be sent: >> >> >> >> Transmit that new segment >> >> >> >> FlightSize +=3D SMSS >> >> >> >> Else: >> >> >> >> Retransmit the last segment=E2=80=9D >> >> >> >> This needs to be crisper about what is meant by =E2=80=9Cpreviously u= nsent=E2=80=9D and >> >> =E2=80=9Clast segment=E2=80=9D. For example the sender could have sen= t a large amount > of >> >> data and then taken a full RTO. In this case if PTO fires, do > =E2=80=9Cpreviously >> >> unsent=E2=80=9D and =E2=80=9Clast segment=E2=80=9D refer to MSS size = segments straddling just > before >> >> and after SND.NXT? OR do they straddle around the largest sent > sequence >> >> number ever in the connection lifetime? >> > >> > >> > Very good questions. I like your suggestion to be crisper in this > section. >> > The Linux TCP stack does not "rewind" SND.NXT upon RTO, so in the Linu= x > TCP >> > stack the SND.NXT point and "largest sent sequence number ever in the >> > connection lifetime" are basically the same point. That is the > framework in >> > which we were thinking for those lines. >> > >> > In my mind... >> > >> > By "a previously unsent segment" we mean basically "the next segment > (of MSS >> > or fewer bytes) that the sender would normally send if it had availabl= e > cwnd >> > at this time." That is something that presumably every > production-quality >> > TCP stack has very quick access to. >> > >> > By "the last segment" we mean "the highest-sequence segment (of MSS or > fewer >> > bytes) that has already been transmitted and not ACKed or SACKed." I > imagine >> > this should also be generally very quick to access (at least it can be >> > quickly accessed in two generations of the Linux TCP write queue). Let > us >> > know if not, and we can discuss. >> > >> > Does that help clarify those parts? If so, we can update the text to >> > incorporate something like that (suggestions?). > >> I am thinking that we can just say "send one (SMSS or smaller) segment >> that contains up to highest sequence number it has sent." >> I am a bit wondering if not ACKed or SACKed requirement should be >> mandatory, although it will be a bit redundant. > > Yes, good point; the "not ACKed or SACKed" I added in my email message wa= s > redundant. > > So we could replace: > "Retransmit the last segment" > with: > "Retransmit the highest-sequence segment sent so far" Thanks. The texts look good to me. >> > A sender should schedule a PTO only if all of the following conditions > are >> > met: >> > >> > The connection supports SACK [RFC2018] > >> Do we need to check this? I mean RACK already presumes SACK nodes. I >> thought TLP does as well. >> Or, do we want to use TLP with non-SACK nodes? > > Yes, both RACK and TLP require SACK. I agree that it could be considered > redundant to specify the SACK dependency in the TLP section, given that w= e > have already mentioned in section "3. Requirements" that RACK depends on > SACK. But IMHO it is worthwhile to keep this dependency separately listed > here for TLP, to try to make it clear/explicit that the TLP algorithm has > its own dependency on SACK. Yes, I agree with it because RACK and TLP are two different algorithms. But, I think it would be better being stated at the early part of the TLP description, but not in Scheduling a loss probe. >> > The connection has no SACKed sequences in the SACK scoreboard >> > >> > The connection is not in loss recovery >> > >> > The most recently transmitted data was not itself a TLP probe (i.e. a > sender >> > MUST NOT send consecutive or back-to-back TLP probes). > >> I think the third condition might be a bit ambiguous and may require >> another variable. If we check TLPRtxOut and TLPHighRxt, might it be >> sufficient? > > Yes, I agree this condition is not as clear as it should be. There are > really several considerations: > > (a) we don't want an unterminating chain of TLPs, where after sending a T= LP > probe we rearm the PTO timer and send another TLP > > (b) we can't allow multiple outstanding TLP retransmissions > > (Checking TLPRxtOut would cover (b) but not (a). And checking TLPRxtOut i= s > discussed elsewhere in the draft.) > > The way the Linux TCP TLP code handles this as follows: > > For (a), we ensure this structurally in the call sequence: after sending = a > TLP probe, we rearm the RTO timer, not the TLP timer. This is already > discussed in the section "Phase 2: Sending a loss probe". > > For (b), before sending a TLP retransmission we effectively check TLPRxtO= ut > and do not send a TLP at all if there is an outstanding TLP retransmissio= n. > This is already discussed in "Recording loss probe states". > > Given that those issues are already discussed elsewhere, I'd propose to > remove that line "The most recently transmitted data was not itself a TLP > probe (i.e. a sender MUST NOT send consecutive or back-to-back TLP > probes).". Instead in the -04 draft I'd propose we just add a brief note = at > the end of the "Phase 2: Sending a loss probe" section: > > Note that after transmitting a TLP, the sender MUST arm an RTO timer, > and not the PTO timer. This ensures that the sender does not send > repeated, > back-to-back TLP probes. I might want to think about it more, but it looks fine. Thanks for addressing. -- Yoshi From nobody Mon May 28 09:18:03 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 D2BC112E047; Mon, 28 May 2018 09:16:36 -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, T_DKIMWL_WL_HIGH=-0.01, 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, port 10024) with ESMTP id c1nO8Vj_NVaP; Mon, 28 May 2018 09:16:25 -0700 (PDT) Received: from EUR03-DB5-obe.outbound.protection.outlook.com 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-0700 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, 28 May 2018 16:16:37 -0000 --_000_AM5PR0701MB25474501ED9676DAE544E70F936E0AM5PR0701MB2547_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgQm9iLA0KDQpTb3JyeSBmb3IgdGhlIGRlbGF5ZWQgcmVzcG9uc2UuIEhvbmVzdGx5IHNwZWFr aW5nLCB0aGlzIG1hdGVyaWFsIGlzIGhhcmQgdG8gcGFyc2UgYW5kIEkgZG9u4oCZdCBmdWxseSB1 bmRlcnN0YW5kIHdoYXQgdGhlIHByb3Bvc2VkIGNoYW5nZSBvZiB0ZXh0IGluIGEgdmVyc2lvbiAt MDcgd291bGQgYmUuDQoNCkFuZCBJIG1heSBnZXQgc29tZWhvdyBsb3N0IGluIHRoZSBkZXRhaWxz IGhlcmUsIGJ1dCB0aGUgcmF0aW9uYWwgZm9yIHRoZSBjaGFuZ2UgYXMgY29tcGFyZWQgdG8gLTAz IGlzIHN0aWxsIG5vdCBjbGVhciB0byBtZS4NCg0KSW4gYW55IGNhc2UsIHRvIG1lIGFzIGluZGl2 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16:23:40 +0000 From: "Scharf, Michael (Nokia - DE/Stuttgart)" To: "Scheffenegger, Richard" , Bob Briscoe CC: =?utf-8?B?TWlyamEgS8O8aGxld2luZA==?= , "draft-ietf-tcpm-accurate-ecn@ietf.org" , "tcpm@ietf.org" Thread-Topic: [tcpm] Comments on draft-ietf-tcpm-accurate-ecn Thread-Index: AdNsZwbKZl7dQfJhQeSI1pXOpUN55hIGf9OAAUAqXJABhWrLvwAAwwQAA5i4bYAAAzaxAAolRdyQ Date: Mon, 28 May 2018 16:23:40 +0000 Message-ID: References: <44FDECF5-A031-4343-BA1A-AE0D9C2C078C@tik.ee.ethz.ch> <7869808f-4e15-1180-da89-a0f2b043b46c@bobbriscoe.net> <1764966d-b916-c7e7-3d96-370ecf110a11@gmx.at> In-Reply-To: <1764966d-b916-c7e7-3d96-370ecf110a11@gmx.at> Accept-Language: en-US, de-DE Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.245.212.158] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; AM5PR0701MB2610; 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Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 May 2018 16:23:45 -0000 PiBPbmUgbGFzdCBwb2ludCDigJMgc2hhbGwgd2UgbWVudGlvbiB0aGUgRUNUMSBvbiBTWU4gZXhw bGljaXRseSBpbiB0aGUNCj4gY29udGV4dCBvZiBMNFMtYXJjaD8NCg0KVG8gc29tZW9uZSBub3Qg cmVhbGx5IGZhbWlsaWFyIHdpdGggTDRTIGl0IG1heSBub3QgYmUgb2J2aW91cyB3aHkgZmVlZGJh Y2sgb24gRUNUMSBpcyBuZWVkZWQuIFNvLCB5ZXMsIEkgYmVsaWV2ZSBjb2RlcG9pbnQgYWxsb2Nh dGlvbiBuZWVkcyByZWFzb25pbmcuDQoNCk1pY2hhZWwNCg== From nobody Thu May 31 08:17:22 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 58CF612EC9D for ; Thu, 31 May 2018 07:24:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.2 X-Spam-Level: X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, 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 4a05I1FF1B8g for ; Thu, 31 May 2018 07:24:19 -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 A087D12E044 for ; Thu, 31 May 2018 07:24:17 -0700 (PDT) Received: by rfc-editor.org (Postfix, from userid 30) id B5ED7B825CF; Thu, 31 May 2018 07:23:55 -0700 (PDT) To: ycheng@google.com, hkchu@google.com, sivasankar@cs.ucsd.edu, arvind@google.com, spencerdawkins.ietf@gmail.com, ietf@kuehlewind.net, michael.scharf@nokia.com, tuexen@fh-muenster.de, nishida@sfc.wide.ad.jp X-PHP-Originating-Script: 30:errata_mail_lib.php From: RFC Errata System Cc: vladnc@gmail.com, tcpm@ietf.org, rfc-editor@rfc-editor.org Content-Type: text/plain; charset=UTF-8 Message-Id: <20180531142355.B5ED7B825CF@rfc-editor.org> Date: Thu, 31 May 2018 07:23:55 -0700 (PDT) Archived-At: X-Mailman-Approved-At: Thu, 31 May 2018 08:17:20 -0700 Subject: [tcpm] [Technical Errata Reported] RFC7413 (5373) 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, 31 May 2018 14:24:28 -0000 The following errata report has been submitted for RFC7413, "TCP Fast Open". -------------------------------------- You may review the report below and at: http://www.rfc-editor.org/errata/eid5373 -------------------------------------- Type: Technical Reported by: Vladimir Nicolici Section: 4.1.3.1. Original Text ------------- For any negative responses, the client SHOULD disable Fast Open on the specific path (the source and destination IP addresses and ports) at least temporarily. Corrected Text -------------- For any negative responses, the client SHOULD disable Fast Open on the specific path (the source and destination IP addresses and the destination port) at least temporarily. Notes ----- The original language seems to imply that the cached negative response should only affect connections if they are initiated from the same source port and source IP. Since the client source port can change for subsequent TCP connections, and it's unlikely that just changing the source port would result in a successful TCP FO connection when a previous connection from a different source port failed, associating the cached negative response with the source port is probably not very useful, and could actually be detrimental to performance and reliability, depending on the implementation. If the implementation would decide to check the source port when matching negative cached responses to a new connection, it would negatively impact performance when the source port changes, because the implementation wouldn't find a matching negative response in the cache. Furthermore, if each connection retry is made from a different source port, checking the source port when matching the cached negative responses would make the client unable to connect to the server, until all possible source ports are included in cached negative responses. This means it's much better not recommending to associate the source port to the cached negative responses, to prevent any confusion and possible implementation issues. Either that, or add additional clarification, describing exactly how a negative cached response should be matched to a subsequent connection attempt. 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. -------------------------------------- RFC7413 (draft-ietf-tcpm-fastopen-10) -------------------------------------- Title : TCP Fast Open Publication Date : December 2014 Author(s) : Y. Cheng, J. Chu, S. Radhakrishnan, A. Jain Category : EXPERIMENTAL Source : TCP Maintenance and Minor Extensions Area : Transport Stream : IETF Verifying Party : IESG From nobody Thu May 31 08:17:28 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 389E112EC3B for ; Thu, 31 May 2018 07:36:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -17.51 X-Spam-Level: X-Spam-Status: No, score=-17.51 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_DKIMWL_WL_MED=-0.01, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5] 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 GVVKRPuyFnEt for ; Thu, 31 May 2018 07:36:25 -0700 (PDT) Received: from mail-it0-x241.google.com (mail-it0-x241.google.com [IPv6:2607:f8b0:4001:c0b::241]) (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 E06B412EC88 for ; Thu, 31 May 2018 07:36:24 -0700 (PDT) Received: by mail-it0-x241.google.com with SMTP id d10-v6so27880063itj.1 for ; Thu, 31 May 2018 07:36:24 -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=DqzhMxcS6mbLOwNCxgqEhnRZc5960S9my+37+Setnwo=; b=Ywz87LgcOtoppxTwV9iqcpiv2hko1vSPZfhc16A2pFDY7mY54xKTT14CMFCeBom12C 04rp/FvKs60vGLQV0bdFXuiEBLnUIpKZsX0HZks4amKg0z24jyJ8/F1y998iR9f0ju52 qCBTnH18i1ZZJUJ6bIDLsSFwXKKGkykmZ2+IIRYqE0lTnk+JwdkOWn9v8S8pa9MyDQuC R/nORCP18Xv7fYIMU84+ebC2vz92gbAhGi3xQJYX5wmV8sChZMgqRk+52B+aWHy/zbfH L0ljifcE2ZSkao4v97eYkRZ1RTmAYzhUSTbgK4QTVhZHmFg+k5dm6lylxUlxtc2iQ6XJ BiCQ== 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=DqzhMxcS6mbLOwNCxgqEhnRZc5960S9my+37+Setnwo=; b=MKZGnmh3TLPyRU/sdeH+6r0B3MX+2q6UGwJfXbXCUi9Qmu+yXljsJrHQXNpfCxcHA5 kvL4YfqI3GN66Hg5Wi3yQWs0Iif7XpqCFqIcbD9TzI2ZZIqfZwSLttcokKNPgcOKdIT4 W/JrY9mHPDhxipPoGooIwhKDB94dkhnrfGA84eg9OJTuseJVOxTPr22ix8biHWgRvjvE 9718qyfrSIlp9yJtH44+WTTIpa1+1nJLdDTsGk3gsOaMjtXv6BGWBobmC34g7bWHeRaM HeGZxdfuS2tVrc2YPWaldkb3QGN74oGECvkA4eXcQ+atp5OSEJc8SsckOTNgR8gp0Zj5 IXjA== X-Gm-Message-State: APt69E34Rs6hnKGqbfm9giLrCoDfnOhuT2fA6Z699vV5FhDY1HvV51Aj PnpDv5RYa3K7btsWN2E0Dxyf5TxgMELfGKyhOVf9Hw== X-Google-Smtp-Source: ADUXVKKZR/7bCl/blJ+QndjW+kbMXfc7SjyPA7kyhVxDs+jfwbJScCQjbzDfRszQVEeqDBEMHVFzGL/DBsOGzT+WV18= X-Received: by 2002:a24:17c2:: with SMTP id 185-v6mr186586ith.45.1527777383789; Thu, 31 May 2018 07:36:23 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a6b:6b17:0:0:0:0:0 with HTTP; Thu, 31 May 2018 07:35:42 -0700 (PDT) In-Reply-To: <20180531142355.B5ED7B825CF@rfc-editor.org> References: <20180531142355.B5ED7B825CF@rfc-editor.org> From: Yuchung Cheng Date: Thu, 31 May 2018 07:35:42 -0700 Message-ID: To: RFC Errata System Cc: Jerry Chu , Sivasankar Radhakrishnan , Arvind Jain , Spencer Dawkins , "Mirja Kuehlewind (IETF)" , "SCHARF, Michael (Michael)" , Michael Tuexen , Yoshifumi Nishida , vladnc@gmail.com, "tcpm@ietf.org Extensions" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: X-Mailman-Approved-At: Thu, 31 May 2018 08:17:20 -0700 Subject: Re: [tcpm] [Technical Errata Reported] RFC7413 (5373) 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, 31 May 2018 14:36:27 -0000 On Thu, May 31, 2018 at 7:23 AM, RFC Errata System wrote: > > The following errata report has been submitted for RFC7413, > "TCP Fast Open". > > -------------------------------------- > You may review the report below and at: > http://www.rfc-editor.org/errata/eid5373 > > -------------------------------------- > Type: Technical > Reported by: Vladimir Nicolici > > Section: 4.1.3.1. > > Original Text > ------------- > For any negative responses, the client SHOULD disable Fast Open on > the specific path (the source and destination IP addresses and ports) > at least temporarily. > > > Corrected Text > -------------- > For any negative responses, the client SHOULD disable Fast Open on > the specific path (the source and destination IP addresses > and the destination port) at least temporarily. Looks good to me. Thanks for catching this! > > > Notes > ----- > The original language seems to imply that the cached negative response sh= ould only affect connections if they are initiated from the same source por= t and source IP. > > Since the client source port can change for subsequent TCP connections, a= nd it's unlikely that just changing the source port would result in a succe= ssful TCP FO connection when a previous connection from a different source = port failed, associating the cached negative response with the source port = is probably not very useful, and could actually be detrimental to performan= ce and reliability, depending on the implementation. > > If the implementation would decide to check the source port when matching= negative cached responses to a new connection, it would negatively impact = performance when the source port changes, because the implementation wouldn= 't find a matching negative response in the cache. > > Furthermore, if each connection retry is made from a different source por= t, checking the source port when matching the cached negative responses wou= ld make the client unable to connect to the server, until all possible sour= ce ports are included in cached negative responses. > > This means it's much better not recommending to associate the source port= to the cached negative responses, to prevent any confusion and possible im= plementation issues. > > Either that, or add additional clarification, describing exactly how a ne= gative cached response should be matched to a subsequent connection attempt= . > > 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. > > -------------------------------------- > RFC7413 (draft-ietf-tcpm-fastopen-10) > -------------------------------------- > Title : TCP Fast Open > Publication Date : December 2014 > Author(s) : Y. Cheng, J. Chu, S. Radhakrishnan, A. Jain > Category : EXPERIMENTAL > Source : TCP Maintenance and Minor Extensions > Area : Transport > Stream : IETF > Verifying Party : IESG