From nobody Mon Jun 2 08:19:34 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8F6B81A030F for ; Mon, 2 Jun 2014 08:19:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.001 X-Spam-Level: X-Spam-Status: No, score=-0.001 tagged_above=-999 required=5 tests=[BAYES_40=-0.001, RCVD_IN_DNSWL_NONE=-0.0001] autolearn=ham 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 S56yPey7ZLmO for ; Mon, 2 Jun 2014 08:19:32 -0700 (PDT) Received: from atl4mhob08.myregisteredsite.com (atl4mhob08.myregisteredsite.com [209.17.115.46]) by ietfa.amsl.com (Postfix) with ESMTP id 41D291A0241 for ; Mon, 2 Jun 2014 08:19:32 -0700 (PDT) Received: from mailpod.hostingplatform.com ([10.30.71.207]) by atl4mhob08.myregisteredsite.com (8.14.4/8.14.4) with ESMTP id s52FJOJg023232 for ; Mon, 2 Jun 2014 11:19:24 -0400 Received: (qmail 7593 invoked by uid 0); 2 Jun 2014 15:19:24 -0000 X-TCPREMOTEIP: 107.47.199.49 X-Authenticated-UID: wes@mti-systems.com Received: from unknown (HELO ?192.168.43.65?) (wes@mti-systems.com@107.47.199.49) by 0 with ESMTPA; 2 Jun 2014 15:19:24 -0000 Message-ID: <538C95F8.1000403@mti-systems.com> Date: Mon, 02 Jun 2014 11:19:20 -0400 From: Wesley Eddy Organization: MTI Systems User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 MIME-Version: 1.0 To: "aqm@ietf.org" Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/FsiBCU9KC1QqL1NUWnYoLDLQvHw Subject: [aqm] AQM conference call - June 24 X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Jun 2014 15:19:33 -0000 Hello, we're planning on holding an AQM conference call on June 24 at 1PM US/Eastern time. We'll publish webex/telecon coordinates closer to the day. This is just a notification for calendar planning purposes. We will also have it announced to the IETF announcement list soon. The goal of this is to give us a chance to focus some higher bandwidth discussion around the working group milestones, and hopefully make a little bit of progress prior to the next actual working group meeting at IETF 90. I'm hoping that we need no more than about an hour and a half. The rough agenda (for bashing) is: 1 - discuss overall WG status quickly 2 - discuss state of the 2309bis / recommendation draft - if any editors or people with comments are online, this will be a chance to discuss any remaining items that haven't converged through the mailing list yet 3 - discuss state of evaluation guidelines / scenarios - if one of the editors is available, we'd like them to share plans and status briefly 4 - discuss possibly adopting algorithms, as mentioned on the mailing list and get some feedback on this 5 - plan agenda for Toronto -- Wes Eddy MTI Systems From nobody Mon Jun 2 12:18:04 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F202D1A041F for ; Mon, 2 Jun 2014 12:18:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-0.001] autolearn=ham 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 Hg3ZvETg6L_1 for ; Mon, 2 Jun 2014 12:17:58 -0700 (PDT) Received: from mail-we0-x234.google.com (mail-we0-x234.google.com [IPv6:2a00:1450:400c:c03::234]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B868F1A0275 for ; Mon, 2 Jun 2014 12:17:57 -0700 (PDT) Received: by mail-we0-f180.google.com with SMTP id q58so5619049wes.25 for ; Mon, 02 Jun 2014 12:17:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=ttJyml0IfLaL/FNb2E1f/bM5H9QsQ+lVce8dcfrk9Co=; b=WGlzr0ocRXYOoYrCmFrGWDWbNwU8IaM88BdYpDRCvn2ObQU1YnhaSnaEEBAc1aRMOs w2bW47J7mmhJ33BqhyENWSTRGT8/mTRDGWxOf8EwpIkv96PuPXn4uC89sfs1jWPMp2h0 U8HStMSsYejyyF1AFf5w1zaiVwVkvC7TJoYH2euPGOHYaXy+mT4TLRqGt2uCLkwPtKto 6C3ESJMe0MYnsuO++JzT+k8hkw4oQSUDPz75OGo4TNI8ZIlp+W234q/lql9DJ/ZuBDdo 7PiZFcD9cbGBuv+gL/yOoBZKfjlcU+HkKkxgBoNs6f8ojtcZezI3Gh1lYrfw0DIaMHqA cYog== MIME-Version: 1.0 X-Received: by 10.180.19.201 with SMTP id h9mr25295809wie.17.1401736671053; Mon, 02 Jun 2014 12:17:51 -0700 (PDT) Received: by 10.216.207.82 with HTTP; Mon, 2 Jun 2014 12:17:51 -0700 (PDT) In-Reply-To: <538C95F8.1000403@mti-systems.com> References: <538C95F8.1000403@mti-systems.com> Date: Mon, 2 Jun 2014 12:17:51 -0700 Message-ID: From: Dave Taht To: Wesley Eddy Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/HVUd71d-V0QIqTehGZ9Lcxzp-wg Cc: "aqm@ietf.org" Subject: Re: [aqm] AQM conference call - June 24 X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Jun 2014 19:18:03 -0000 On Mon, Jun 2, 2014 at 8:19 AM, Wesley Eddy wrote: > Hello, we're planning on holding an AQM conference call on June 24 > at 1PM US/Eastern time. > > We'll publish webex/telecon coordinates closer to the day. This is > just a notification for calendar planning purposes. I don't have webex capability. Do have google hangouts. Can dial in. > We will also have it announced to the IETF announcement list soon. > > The goal of this is to give us a chance to focus some higher bandwidth > discussion around the working group milestones, and hopefully make a > little bit of progress prior to the next actual working group meeting > at IETF 90. > > I'm hoping that we need no more than about an hour and a half. > > The rough agenda (for bashing) is: > > 1 - discuss overall WG status quickly > 2 - discuss state of the 2309bis / recommendation draft > - if any editors or people with comments are online, this will be > a chance to discuss any remaining items that haven't converged > through the mailing list yet > 3 - discuss state of evaluation guidelines / scenarios > - if one of the editors is available, we'd like them to share > plans and status briefly > 4 - discuss possibly adopting algorithms, as mentioned on the mailing > list and get some feedback on this I am interested in feedback and discussion on the following two drafts before that date, if possible: http://tools.ietf.org/html/draft-nichols-tsvwg-codel-02 http://tools.ietf.org/html/draft-hoeiland-joergensen-aqm-fq-codel-00 IF the wg is interested in seeing this draft completed before ietf, let me know soonest: http://snapon.lab.bufferbloat.net/~d/draft-taht-home-gateway-best-practices= -00.html I would probably accompany it with a preso on "the case for comprehensive queue management", talking about the expected network behavior and test suites developed by other wgs like webrtc. > 5 - plan agenda for Toronto > > > -- > Wes Eddy > MTI Systems > > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm --=20 Dave T=C3=A4ht NSFW: https://w2.eff.org/Censorship/Internet_censorship_bills/russell_0296_= indecent.article From nobody Mon Jun 2 12:27:09 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 723571A0275 for ; Mon, 2 Jun 2014 12:27:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.89 X-Spam-Level: X-Spam-Status: No, score=-1.89 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, T_FILL_THIS_FORM_SHORT=0.01] autolearn=ham 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 7Akq5mlnrP8V for ; Mon, 2 Jun 2014 12:27:07 -0700 (PDT) Received: from atl4mhob06.myregisteredsite.com (atl4mhob06.myregisteredsite.com [209.17.115.44]) by ietfa.amsl.com (Postfix) with ESMTP id E4C791A0223 for ; Mon, 2 Jun 2014 12:27:06 -0700 (PDT) Received: from mailpod.hostingplatform.com ([10.30.71.208]) by atl4mhob06.myregisteredsite.com (8.14.4/8.14.4) with ESMTP id s52JQwBH008537 for ; Mon, 2 Jun 2014 15:26:58 -0400 Received: (qmail 11674 invoked by uid 0); 2 Jun 2014 19:26:58 -0000 X-TCPREMOTEIP: 107.46.121.136 X-Authenticated-UID: wes@mti-systems.com Received: from unknown (HELO ?192.168.43.65?) (wes@mti-systems.com@107.46.121.136) by 0 with ESMTPA; 2 Jun 2014 19:26:58 -0000 Message-ID: <538CCFFF.7000605@mti-systems.com> Date: Mon, 02 Jun 2014 15:26:55 -0400 From: Wesley Eddy Organization: MTI Systems User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 MIME-Version: 1.0 To: "aqm@ietf.org" References: <538C95F8.1000403@mti-systems.com> In-Reply-To: <538C95F8.1000403@mti-systems.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/vYyReYge0hnqPgdVsqFm7DDEQR0 Subject: Re: [aqm] AQM conference call - June 24 X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Jun 2014 19:27:08 -0000 Here are webex and teleconference information for this meeting: Topic: AQM Date: Tuesday, June 24, 2014 Time: 1:00 pm, Eastern Daylight Time (New York, GMT-04:00) Meeting Number: 644 364 555 Meeting Password: 1234 ------------------------------------------------------- To join the online meeting (Now from mobile devices!) ------------------------------------------------------- 1. Go to https://ietf.webex.com/ietf/j.php?MTID=ma8f0c666476fa3d8dd02ea205a46c036 2. If requested, enter your name and email address. 3. If a password is required, enter the meeting password: 1234 4. Click "Join". To view in other time zones or languages, please click the link: https://ietf.webex.com/ietf/j.php?MTID=mc8130e6e7792ca3024a9d7769782a4ba ------------------------------------------------------- To join the audio conference only ------------------------------------------------------- Call-in toll number (US/Canada): 1-650-479-3208 Access code:644 364 555 ------------------------------------------------------- For assistance ------------------------------------------------------- 1. Go to https://ietf.webex.com/ietf/mc 2. On the left navigation bar, click "Support". You can contact me at: cmorgan@amsl.com 1-510-492-4085 To add this meeting to your calendar program (for example Microsoft Outlook), click this link: https://ietf.webex.com/ietf/j.php?MTID=m8c5e445ca347986e1d4d6cd7ee8abb3a The playback of UCF (Universal Communications Format) rich media files requires appropriate players. To view this type of rich media files in the meeting, please check whether you have the players installed on your computer by going to https://ietf.webex.com/ietf/systemdiagnosis.php. -- Wes Eddy MTI Systems From nobody Mon Jun 2 13:03:53 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6C64B1A0445; Mon, 2 Jun 2014 13:03:49 -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] autolearn=ham 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 c0T7wYOejAqX; Mon, 2 Jun 2014 13:03:48 -0700 (PDT) Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 10F521A0437; Mon, 2 Jun 2014 13:03:48 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IESG Secretary To: IETF Announcement List X-Test-IDTracker: no X-IETF-IDTracker: 5.4.2.p3 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <20140602200348.16879.5902.idtracker@ietfa.amsl.com> Date: Mon, 02 Jun 2014 13:03:48 -0700 Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/yPJWkh00J-tBvxaCmaaFucXpM-0 Cc: aqm@ietf.org Subject: [aqm] AQM WG Conference Call, June 24, 2014 X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Reply-To: ietf@ietf.org List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Jun 2014 20:03:49 -0000 The AQM working group is going to have a conference call on June 24, 2014 from 1:00-2:30 PM EDT. The draft agenda is available at: http://www.ietf.org/mail-archive/web/aqm/current/msg00658.html Topic: AQM Date: Tuesday, June 24, 2014 Time: 1:00 pm, Eastern Daylight Time (New York, GMT-04:00) Meeting Number: 644 364 555 Meeting Password: 1234 ------------------------------------------------------- To join the online meeting (Now from mobile devices!) ------------------------------------------------------- 1. Go to https://ietf.webex.com/ietf/j.php?MTID=ma8f0c666476fa3d8dd02ea205a46c036 2. If requested, enter your name and email address. 3. If a password is required, enter the meeting password: 1234 4. Click "Join". To view in other time zones or languages, please click the link: https://ietf.webex.com/ietf/j.php?MTID=mc8130e6e7792ca3024a9d7769782a4ba ------------------------------------------------------- To join the audio conference only ------------------------------------------------------- Call-in toll number (US/Canada): 1-650-479-3208 Access code:644 364 555 ------------------------------------------------------- For assistance ------------------------------------------------------- 1. Go to https://ietf.webex.com/ietf/mc 2. On the left navigation bar, click "Support". To add this meeting to your calendar program (for example Microsoft Outlook), click this link: https://ietf.webex.com/ietf/j.php?MTID=m8c5e445ca347986e1d4d6cd7ee8abb3a The playback of UCF (Universal Communications Format) rich media files requires appropriate players. To view this type of rich media files in the meeting, please check whether you have the players installed on your computer by going to https://ietf.webex.com/ietf/systemdiagnosis.php. From nobody Wed Jun 4 14:56:41 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 046971A0357 for ; Wed, 4 Jun 2014 14:56:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.414 X-Spam-Level: X-Spam-Status: No, score=-0.414 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HELO_EQ_MODEMCABLE=0.768, HOST_EQ_MODEMCABLE=1.368, HTML_MESSAGE=0.001, RP_MATCHES_RCVD=-0.651] autolearn=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 D6sdhbhOlOTk for ; Wed, 4 Jun 2014 14:56:39 -0700 (PDT) Received: from ondar.cablelabs.com (ondar.cablelabs.com [192.160.73.61]) by ietfa.amsl.com (Postfix) with ESMTP id EE0331A024F for ; Wed, 4 Jun 2014 14:56:38 -0700 (PDT) Received: from kyzyl.cablelabs.com (kyzyl [10.253.0.7]) by ondar.cablelabs.com (8.14.7/8.14.7) with ESMTP id s54Lu8Hw016391; Wed, 4 Jun 2014 15:56:32 -0600 Received: from exchange.cablelabs.com (10.5.0.19) by kyzyl.cablelabs.com (F-Secure/fsigk_smtp/407/kyzyl.cablelabs.com); Wed, 04 Jun 2014 15:56:08 -0600 (MDT) X-Virus-Status: clean(F-Secure/fsigk_smtp/407/kyzyl.cablelabs.com) Received: from EXCHANGE.cablelabs.com ([::1]) by EXCHANGE.cablelabs.com ([fe80::797a:96d1:3c53:18ee%11]) with mapi id 14.03.0174.001; Wed, 4 Jun 2014 15:56:20 -0600 From: Greg White To: bloat , "aqm@ietf.org" Thread-Topic: New white paper on AQM in DOCSIS Thread-Index: AQHPgD/RE2U3+9x2aUOUQDPDskNCQA== Date: Wed, 4 Jun 2014 21:56:19 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.4.1.140326 x-originating-ip: [10.5.0.27] Content-Type: multipart/alternative; boundary="_000_CFB4F221361D0gwhitecablelabscom_" MIME-Version: 1.0 Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/yeRvAiPpTph3KWuM3ttCOd1Xaks Subject: [aqm] New white paper on AQM in DOCSIS X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Jun 2014 21:56:40 -0000 --_000_CFB4F221361D0gwhitecablelabscom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable FYI, I've put up a new white paper on the AQM algorithm details for DOCSIS= . It covers the factors that went into the selection of a mandatory AQM al= gorithm for DOCSIS 3.0 and 3.1 modems, as well as the ways in which we cust= omized the PIE algorithm in order to take advantage of awareness of the DOC= SIS MAC layer. Some of this is a repeat of the contents of my I-D, but in = large part the paper provides new info. It can be found here: Active Queue Management in DOCSIS 3.x Cable Modems -Greg --_000_CFB4F221361D0gwhitecablelabscom_ Content-Type: text/html; charset="us-ascii" Content-ID: <35F80B84C893C348AECA425884EBE226@cablelabs.com> Content-Transfer-Encoding: quoted-printable
FYI,  I've put up a new white paper on the AQM algorithm details = for DOCSIS.  It covers the factors that went into the selection of a m= andatory AQM algorithm for DOCSIS 3.0 and 3.1 modems, as well as the ways i= n which we customized the PIE algorithm in order to take advantage of awareness of the DOCSIS MAC layer.  Some o= f this is a repeat of the contents of my I-D, but in large part the paper p= rovides new info.


-Greg
--_000_CFB4F221361D0gwhitecablelabscom_-- From nobody Fri Jun 13 11:43:44 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3F9481B29DA for ; Fri, 13 Jun 2014 11:43:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.852 X-Spam-Level: X-Spam-Status: No, score=-4.852 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-0.651, SPF_PASS=-0.001] autolearn=ham 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 CiDS1RvrGVqx for ; Fri, 13 Jun 2014 11:43:41 -0700 (PDT) Received: from spey.erg.abdn.ac.uk (spey.erg.abdn.ac.uk [139.133.204.173]) by ietfa.amsl.com (Postfix) with ESMTP id A1F6E1A05F5 for ; Fri, 13 Jun 2014 11:43:40 -0700 (PDT) Received: from www.erg.abdn.ac.uk (blake.erg.abdn.ac.uk [139.133.210.30]) by spey.erg.abdn.ac.uk (Postfix) with ESMTPSA id 0F9E62B41EA for ; Fri, 13 Jun 2014 19:43:39 +0100 (BST) Received: from 212.159.18.54 (SquirrelMail authenticated user gorry) by www.erg.abdn.ac.uk with HTTP; Fri, 13 Jun 2014 19:43:38 +0100 Message-ID: Date: Fri, 13 Jun 2014 19:43:38 +0100 From: gorry@erg.abdn.ac.uk To: aqm@ietf.org User-Agent: SquirrelMail/1.4.22 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/oVoFQ9gU0iVXz-KdBX08OFcKUOQ Subject: [aqm] Comments and proposed changes to AQM rec -04 X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Jun 2014 18:43:43 -0000 Following the WGLC there was some further discussion of the AQM WG recommendations draft. Some of this has suggested further updates to this draft. This is a list of the key points we noted, and our proposed action to update draft -04. 1) DOCUMENT FLOW COMMENT BB: The two halves of the document seemed nearly unrelated (at least in draft-03 and it looks like draft-04 hasn't changed this). The first half (Sections 1,2,&3) framed the problem as primarily about preventing congestion collapse and preventing flow-unfairness, while the recommendations (section 4) were about AQM. ACTION: In the new revision we will rearrange/revise section 2 to better align with the document, but we have not done a major revision. --- 2) CONGESTION COLLAPSE BB: Let's take all the stuff about collapse out. Full stop. ACTION: At the moment Congestion Collapse continues to be mentioned, but the text is clear that AQM is just one tool and the primary mechanism is now clearly called out as end-to-end methods: CC and CB. --- 3) FLOW FAIRNESS COMMENT BB: Flow fairness (or user-fairness etc): this is a policy issue that needs to be built in a modular way, for optional addition to AQM. ACTION: This was intended to be clearer in -04, and the text has also been updated. --- 2a) fairness mechanisms COMMENT BB: An AQM must also work well without fairness mechanisms. This conclusion was actually reached in the early sections, but it's not carried forward into the recommendations in section 4. ACTION: Added this to 4.1: AQM mechanisms need to allow combination with other mechanisms, such as scheduling, to allow implementation of polices for providing fairness between different flows. --- 3) Statement of scope. BB: Can we really make all these recommendations irrespective of whether we're talking about high stat-mux core links, low stat-mux access links, low-stat-mux data centre links, or host buffers? Are there different recommendations for edge links (on trust boundaries) vs interior links? Does AQM apply at L2 as well as L3 (of course it does)? Which recommendations are different for each layer? Does AQM apply for middleboxes (firewalls, NATs etc) as much as for switches and routers? If not why not (only need AQM if there can be queuing - perhaps due to processor overload)? To illustrate the problem, our goal should be AQM in every buffer. But we really don't need and shouldn't have policing or isolation in every buffer. NOTE: Gorry - this seems like an issue we have been through, putting AQM in the core would need care, given that most AQM methods we know are optimised for RTT (for instance) which will effectively degrade people "further" away in the Internet? ACTION: The goals of the draft were clarified at the start of section 2: Active Queue Management (AQM) is a method that allows network devices to control the queue length or the mean time that a packet spends in a queue. Although AQM can be applied across a range of deployment enviroments, the recommendations in this document are directed to use in the general Internet. It is expected that the principles and guidance are also applicable to a wide range of environments, but may require tuning for specific types of link/network (e.g. to accommodate the traffic patterns found in data centres, the challenges of wireless infrastructure, or the higher delay encountered on satellite Internet links). The remainder of this section identifies the need for AQM and the advantages of deploying the method. --- 4) synchronisation and lock-out COMMENT BB: * synchronisation and lock-out were both described as vaguely the same problem, * synchronisation wasn't explained, Gorry: Agree completely should be added as a subsection in section 2 - This was overlooked. ACTION: Section 2 now calls out "control loop synchronisation" both as a problem and area to be addressed. Congestion control, like other end-to-end mechanisms, introduces a control loop between hosts. Sessions that share a common network bottleneck can therefore become synchronised, introducing periodic disruption (e.g. jitter/loss). "lock-out" is often also the result of synchronization or other timing effects. Section 4 Recommends: Procedures for dropping or marking packets within the network need to avoid increasing synchronisation events, and hence randomness SHOULD be introduced in the algorithms that generate these congestion signals to the endpoints. --- 5) Large Packet Lock-Out COMMENT BB: * lock-out wasn't explained but it was said to be vaguely to do with synchronisation and solving it would help low capacity bursty flows. Comment on bullet 3 in Sect 2. * large-packet lock-out problems weren't mentioned, only flow-level lock-out. ACTION: Description expanded to: In some situations tail drop allows a single connection or a few flows to monopolize the queue space starving other connection preventing them from getting room in the queue. The simplest mechanism starts with a new or building session attacking a queue that is full. One or more sessions, following algorithms similar to those of [RFC5681], maximizes its effective window, maximizing its impact on a queue somewhere in the network and the effect of that queue on both its own latency and that of competing sessions. It also maximizes the probability of loss from that queue. A new session, sending its initial burst, has an enhanced probability of filling the remaining queue and dropping packets. As a result, the new session can be effectively prevented from sharing the queue effectively for a period of many RTTs. One objective of AQM is to minimize the effect of lock-out by minimizing mean queue depth and therefore the probability that competing sessions can materially prevent each other from performing well. --- 6) Conex COMMENT BB: "there is currently no consensus solution to controlling the congestion caused by such aggressive flows; significant research and engineering will be required before any solution will be available. It is imperative that this work be energetically pursued, to ensure the future stability of the Internet. " The draft could at least mention congestion policing and ConEx RFCs coming out of the IETF right now (e.g. RFC6789 and draft-ietf-conex-abstract-mech, which is with the IESG). ACTION: Added: Methods such as congestion exposure (ConEx) [RFC6789] offer a framework [CONEX] that can update network devices to alleviate these effcects. Significant research and engineering will be required before any solution will be available. It is imperative that work to mitigate the impact of unresponsive flows is energetically pursued, to ensure the future stability of the Internet. --- 7) Refs Comment WE: The Choi04 reference got messed-up in this (authors names are omitted). ACTION: This was an XML problem, fixed in the revision. --- 8) hyperlinks Comment DT: My only major objection at this point was that I would like *all* the references to have hyperlinks to the referenced material. ACTION: Additional reference material can be provided. The RFC-Ed does not normally publish URLs for citations in RFCs. --- 9) bursts Comment DT: talking about the problems induced by bursty loss might be good. ACTION: No specific text has currently been added. --- We plan to submit these changes (and a few editorial corrections) in revision -05, if you have comments on the text or suggestions do let us know. Also let us know if anything important was overlooked and we'll see if we can address this also in rev -05. best wishes, Fred and Gorry From nobody Fri Jun 13 12:39:35 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A58191B2A1E for ; Fri, 13 Jun 2014 12:39:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-0.001] autolearn=ham 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 x7ggeWaYc814 for ; Fri, 13 Jun 2014 12:39:28 -0700 (PDT) Received: from mail-we0-x230.google.com (mail-we0-x230.google.com [IPv6:2a00:1450:400c:c03::230]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2FE6D1B29FF for ; Fri, 13 Jun 2014 12:39:28 -0700 (PDT) Received: by mail-we0-f176.google.com with SMTP id u56so3302525wes.35 for ; Fri, 13 Jun 2014 12:39:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type :content-transfer-encoding; bh=y33TD1cyJN4nm0AXX2471vFqpViGrFBOA1B45PRR5q4=; b=y3+qGrPDJZNqZ+nRaIRRhMy6+ss6Px4Ch4/fHfM3L7aWx7g/GBxdU6vYIomO03rBU8 ZDzcDL6sPWnR/WJv+eHAqUISheZNP5DEo2qus50FP8dqzgaWWCuZ741OkuV7+iSsyduB hle2PqjfI8AkV0LDZYUISugxEW0qPLlv4ZnENPhC6eN+ik+tjbaCy7+I87dFeEwSEOZi z6lRMUFj7TcN/L8Ox2Y9igJFfvt5cCur5hRB+CqOYHOxjO8pF0hRhJTRDPiacAa18mfL 1toMCpQ6Q84Mc84J+EhCKpWBVELTnFFDWDBN6M2fRkNbng8HB9Y0C3drKh5L97qCzqOE kzhQ== MIME-Version: 1.0 X-Received: by 10.194.22.100 with SMTP id c4mr7173651wjf.89.1402688366679; Fri, 13 Jun 2014 12:39:26 -0700 (PDT) Received: by 10.216.207.82 with HTTP; Fri, 13 Jun 2014 12:39:26 -0700 (PDT) Date: Fri, 13 Jun 2014 12:39:26 -0700 Message-ID: From: Dave Taht To: "aqm@ietf.org" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/IVI6vs3-VdEW5h_cJM0bJHONmWs Subject: [aqm] AQM in every buffer? X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Jun 2014 19:39:31 -0000 In the other long thread, gorry said something that didn't quite ring true with me: "Our goal should be AQM in every buffer". Well, that's somewhat desirable but not doable (at least in my world) - 1) The device has sufficient buffering to get at least one packet out. 2) There's a tx ring which puts packets for the device to pick up from 3) In linux now (and some older cisco boxes) there is this thing called "byte queue limits" which moderates the tx ring to only have enough data in it to keep the device busy 4) These layers gives the upper portions of the stack time to think harder about what to put on the tx ring. *Ideally* an AQM should have a picture of the total buffering in the system all the way to the wire, but in practice, at higher speeds, once things are controlled by BQL, it's a trivial amount of extra buffering. (this is partially why I get non-plussed by people dissing "drop head", whe= n what's on the TX ring is already past the "drop head" point of the AQM lay= er ) Now, I imagine that at least some hardware switches *could* have a picture all the way to the wire, but doubt that it's feasible, also. --=20 Dave T=C3=A4ht NSFW: https://w2.eff.org/Censorship/Internet_censorship_bills/russell_0296_= indecent.article From nobody Fri Jun 13 15:07:58 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1DE711B2A7A for ; Fri, 13 Jun 2014 15:07:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -115.152 X-Spam-Level: X-Spam-Status: No, score=-115.152 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_HI=-5, RP_MATCHES_RCVD=-0.651, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_WHITELIST=-100] autolearn=ham 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 5syd2DN0rBzu for ; Fri, 13 Jun 2014 15:07:52 -0700 (PDT) Received: from alln-iport-1.cisco.com (alln-iport-1.cisco.com [173.37.142.88]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 283D21A025A for ; Fri, 13 Jun 2014 15:07:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1994; q=dns/txt; s=iport; t=1402697272; x=1403906872; h=from:to:subject:date:message-id:references:mime-version; bh=QqQz7mZ/+DgtAguWMNrqnua/cK4K7Ytpn99xg5Tw4YM=; b=cHA5ufRiw8M7T0zftXIvxTOmkZwLfnKXDPjGaVi+AKfV6B9F1qMreXPE b190tuZFC/3B712N1P6jWgwMzN5CsGw1K5SAeB2WC7xETzRltp5rdF/cw VsCb/jfQs4Op2hOHSsiKxWqY7av9QsBB4EQChhHL3SvlbTq6s+5kKIlFj U=; X-Files: signature.asc : 195 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhEFACh1m1OtJV2d/2dsb2JhbABagw1SWcMMgQYWdYQDAQEBAwF3BwsCARkDAQIvMhsCCAIEEwkFiCwIDdIKF45Og0OBFgSReYE/hn+BQ5IUgz5sgUQ X-IronPort-AV: E=Sophos;i="5.01,473,1400025600"; d="asc'?scan'208";a="52914082" Received: from rcdn-core-6.cisco.com ([173.37.93.157]) by alln-iport-1.cisco.com with ESMTP; 13 Jun 2014 22:07:51 +0000 Received: from xhc-aln-x11.cisco.com (xhc-aln-x11.cisco.com [173.36.12.85]) by rcdn-core-6.cisco.com (8.14.5/8.14.5) with ESMTP id s5DM7pXm001061 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Fri, 13 Jun 2014 22:07:51 GMT Received: from xmb-rcd-x09.cisco.com ([169.254.9.225]) by xhc-aln-x11.cisco.com ([173.36.12.85]) with mapi id 14.03.0123.003; Fri, 13 Jun 2014 17:07:50 -0500 From: "Fred Baker (fred)" To: "aqm@ietf.org" Thread-Topic: New Version Notification for draft-baker-aqm-sfq-implementation-00.txt Thread-Index: AQHPh1G6BBEMP6l8SU+f0RMhXqzJgg== Date: Fri, 13 Jun 2014 22:07:50 +0000 Message-ID: References: <20140613215207.11613.75352.idtracker@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.19.64.119] Content-Type: multipart/signed; boundary="Apple-Mail=_2ED829A0-11DB-4E14-BE99-EE65D906749F"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/9_ZSJ1CRYbqK4LZNwAV-2L-O8aw Subject: [aqm] Fwd: New Version Notification for draft-baker-aqm-sfq-implementation-00.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Jun 2014 22:07:54 -0000 --Apple-Mail=_2ED829A0-11DB-4E14-BE99-EE65D906749F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 I=92d be interested in comments on this. > From: > Subject: New Version Notification for = draft-baker-aqm-sfq-implementation-00.txt > Date: June 13, 2014 at 2:52:07 PM PDT > To: Fred Baker , Rong Pan , Fred = Baker , Rong Pan >=20 >=20 > A new version of I-D, draft-baker-aqm-sfq-implementation-00.txt > has been successfully submitted by Fred Baker and posted to the > IETF repository. >=20 > Name: draft-baker-aqm-sfq-implementation > Revision: 00 > Title: On Queuing, Marking, and Dropping > Document date: 2014-06-13 > Group: Individual Submission > Pages: 14 > URL: = http://www.ietf.org/internet-drafts/draft-baker-aqm-sfq-implementation-00.= txt > Status: = https://datatracker.ietf.org/doc/draft-baker-aqm-sfq-implementation/ > Htmlized: = http://tools.ietf.org/html/draft-baker-aqm-sfq-implementation-00 >=20 >=20 > Abstract: > This note discusses implementation strategies for coupled queuing = and > mark/drop algorithms. >=20 >=20 >=20 >=20 > Please note that it may take a couple of minutes from the time of = submission > until the htmlized version and diff are available at tools.ietf.org. >=20 > The IETF Secretariat >=20 --Apple-Mail=_2ED829A0-11DB-4E14-BE99-EE65D906749F Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iD8DBQFTm3Y1bjEdbHIsm0MRAmTcAKCMsdyFyd/H4CwUdHN476h74n6ifwCePh1t Zbzxw5gqYSMBqa15hS54kRM= =buuR -----END PGP SIGNATURE----- --Apple-Mail=_2ED829A0-11DB-4E14-BE99-EE65D906749F-- From nobody Fri Jun 13 16:04:50 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 855B01B2A93 for ; Fri, 13 Jun 2014 16:04:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-0.001] autolearn=ham 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 q_K5dhujSS0P for ; Fri, 13 Jun 2014 16:04:46 -0700 (PDT) Received: from mail-wi0-x229.google.com (mail-wi0-x229.google.com [IPv6:2a00:1450:400c:c05::229]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 66C431B2A8E for ; Fri, 13 Jun 2014 16:04:46 -0700 (PDT) Received: by mail-wi0-f169.google.com with SMTP id hi2so2978151wib.0 for ; Fri, 13 Jun 2014 16:04:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=wbA6hCi+e06VxpYZb1Et9YWBc3Qf/OlSW1A3hSmpd3s=; b=mUJTDp8dRF+uVK8VlICY/bKMAy1LfffojOC0fYYgURaVca0GXzq9xTf2uZY87gf0lz PScTjrjC0yEojc3woRRpcbuAqIR6yL4kl1QTmBj24+L0kTFc73Vzv95RtS4HZ8M5ezsu hEnuIhSSgfwYWA2WAxmfMDIGAwUhTqFoTnN01khEIevfaOdPD9NGHdXptbX/PYHC7/lV q49wWKqNPCldZAuIo55e0YnJbLdLom9SaFd+Qwn0OKFEFZgxAsljZHdkHhS8OGzWNdLm KeUdzGMQW08q+PtMT2ibqwYE14kAB9Uud60CbGiliksvsDzHLgvcq5Gm+Ka6OBl4DFge IanA== MIME-Version: 1.0 X-Received: by 10.180.72.15 with SMTP id z15mr8505876wiu.46.1402700684962; Fri, 13 Jun 2014 16:04:44 -0700 (PDT) Received: by 10.216.207.82 with HTTP; Fri, 13 Jun 2014 16:04:44 -0700 (PDT) In-Reply-To: References: <20140613215207.11613.75352.idtracker@ietfa.amsl.com> Date: Fri, 13 Jun 2014 16:04:44 -0700 Message-ID: From: Dave Taht To: "Fred Baker (fred)" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/kz8hU5R2eJx_z6ASx81WqU9AK6o Cc: "aqm@ietf.org" Subject: Re: [aqm] Fwd: New Version Notification for draft-baker-aqm-sfq-implementation-00.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Jun 2014 23:04:48 -0000 Really excellent, Fred, on a first reading! nit 1) drops tend to happen in bursts on a tail drop queue (not necessarily on this bottleneck, but elsewhere on the network). By breaking up flows into sequences of distinctly different packets, this applies minor damage to more flows, instead of severe damage to one flow. I don't know where to put this or how to express it anywhere near as well as you expressed everything else. 2) weighted FQ algos like QFQ and WFQ are interesting from a take-advantage-of-diffserv perspective. I keep hoping to get a simplified and more fq_codel-like implementation of QFQ, in particular. 3) sch_fq is a *perfect* fq algo, instead of using a hash, it uses a red-black tree to keep track of all flows. While memory and compute intensive for a router, it's pretty awesome on hosts, and makes it possible to schedule (and pace) tcp flows at a level much closer to the driver hardware, using the same new/sparse vs persistent queue distinction fq_codel does. 4) While I think I finally understand your longstanding criticism of how aqm and scheduling technologies are indeed distinct, there is a parameter that must be shared globally between the two algorithms: the maximum overall queue length (governing worst case drop behavior). This is the basic flaw of applying (at least in linux) sfq, drr, qfq, htb, etc naively with a drop tail queue, as the maximum overall queue length is additive. Take for example a simple QoS setup filter that breaks up stuff into 4 QoS queues: drr 1 -> sfq limit 127 (prio) drr 2 -> sfq limit 127 (video) drr 3 -> sfq limit 127 (BE) drr 4 -> sfq limit 127 (background) So you end up with worst case drop tail and delay behavior for drr + sfq queue of 4*127 packets. If using weighted drr, the proportions change, but the worst case drop behavior does not. If using something like htb, the background queue has a worst case drop tail and delay behavior of 4*127, be, 3*127, and so on. Having a shared overall queue size is extremely important for being able to classify queues and get sane behavior. You could, for example, try using 32 packet queues to get the same overall worst case latency guarantee but you'd sacrifice bandwidth if the majority of traffic was BE only. This is less important with a system that tries to measure latency and be intelligent about drop behavior, but you still have worst case behavior that is additive in the case of non-responsive flows. 4a) The problem with using individual queues for something like pie-per-fq'd_queue, is that pie depends on being able to sample X number of packets in order to determine it's drop decision, which it may not get relevant to the overall load on the system for flows that are too small to tweak pie's estimator, yet worth dropping a packet from. 4b) and the opposite problem in codel, with a single codel queue taking fq'd packets (rather than one codel queue per fq) is the reliance on timestamps for dropping in and out of drop state, which doesn't work if you don't do the timestamp in the right place. (I'll no doubt find more nits later :) ) On Fri, Jun 13, 2014 at 3:07 PM, Fred Baker (fred) wrote: > I=E2=80=99d be interested in comments on this. > >> From: >> Subject: New Version Notification for draft-baker-aqm-sfq-implementation= -00.txt >> Date: June 13, 2014 at 2:52:07 PM PDT >> To: Fred Baker , Rong Pan , Fred Baker = , Rong Pan >> >> >> A new version of I-D, draft-baker-aqm-sfq-implementation-00.txt >> has been successfully submitted by Fred Baker and posted to the >> IETF repository. >> >> Name: draft-baker-aqm-sfq-implementation >> Revision: 00 >> Title: On Queuing, Marking, and Dropping >> Document date: 2014-06-13 >> Group: Individual Submission >> Pages: 14 >> URL: http://www.ietf.org/internet-drafts/draft-baker-aqm-sfq-= implementation-00.txt >> Status: https://datatracker.ietf.org/doc/draft-baker-aqm-sfq-imp= lementation/ >> Htmlized: http://tools.ietf.org/html/draft-baker-aqm-sfq-implement= ation-00 >> >> >> Abstract: >> This note discusses implementation strategies for coupled queuing and >> mark/drop algorithms. >> >> >> >> >> Please note that it may take a couple of minutes from the time of submis= sion >> until the htmlized version and diff are available at tools.ietf.org. >> >> The IETF Secretariat >> > > > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm > --=20 Dave T=C3=A4ht NSFW: https://w2.eff.org/Censorship/Internet_censorship_bills/russell_0296_= indecent.article From nobody Fri Jun 13 17:26:48 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C67A71B2AC0 for ; Fri, 13 Jun 2014 17:26:46 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 1.3 X-Spam-Level: * X-Spam-Status: No, score=1.3 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, GB_SUMOF=1, MANGLED_TOOL=2.3, SPF_PASS=-0.001] autolearn=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 xm_CGBKCIf0v for ; Fri, 13 Jun 2014 17:26:45 -0700 (PDT) Received: from mail-wi0-x235.google.com (mail-wi0-x235.google.com [IPv6:2a00:1450:400c:c05::235]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0B1C11B2ABE for ; Fri, 13 Jun 2014 17:26:44 -0700 (PDT) Received: by mail-wi0-f181.google.com with SMTP id n3so1662579wiv.14 for ; Fri, 13 Jun 2014 17:26:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=5ARPvGAKSu9kVovGuULmTRtso/raYC8hp3XBKlmfV/w=; b=p70oNcAua10Ij46FtLGoS1N7KrrsWNgR5XsTnDJYSg08d0EOTwv+YB5Gh6mssC+XAc l1+5HKht7eQVyWoy/D4d3fOq+CEMOTIVG1ihJ5nc0VSi/xJYQU2Yx/PQrXDKNjJLEVf8 EbvoJVQXYXC//0AmiPwSeBcVSXVqNVUQcuSPXhmusgW9geEDqONr4Mnw57H92b+aytPd eYRVErpfX3fHwWGgKWN7DDxelQYMo2DsCCCph4zAlbJov7BaJ8xCJC9Ocy4la/GwiMZ3 dVW3rhkzDD5hbIjbCitsKOlfwFWXh0OpKX47oaymBp+w26zFqZhvd6MGbIrQJ7anBBHB VESw== MIME-Version: 1.0 X-Received: by 10.180.73.169 with SMTP id m9mr8623588wiv.53.1402705603408; Fri, 13 Jun 2014 17:26:43 -0700 (PDT) Received: by 10.216.207.82 with HTTP; Fri, 13 Jun 2014 17:26:43 -0700 (PDT) In-Reply-To: References: <20140613215207.11613.75352.idtracker@ietfa.amsl.com> Date: Fri, 13 Jun 2014 17:26:43 -0700 Message-ID: From: Dave Taht To: "Fred Baker (fred)" , "aqm@ietf.org" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/5TymW19FnOLly-umJzK1a3ob2PQ Subject: Re: [aqm] Fwd: New Version Notification for draft-baker-aqm-sfq-implementation-00.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 14 Jun 2014 00:26:46 -0000 doing this privately... " The weakness of a WRR approach is the search time expended when the queuing system is relatively empty, which the calendar queue model obviates." This is a little strong. Fq_codel (and DRR) is darn close to O(1) on the dequeue side for sparse numbers of flows. I wouldn't use the word "searching" in describing the behavior of DRR in this case. head =3D &q->new_flows; if (list_empty(head)) { head =3D &q->old_flows; if (list_empty(head)) return NULL; } flow =3D list_first_entry(head, struct fq_codel_flow, flowchain); if (flow->deficit <=3D 0) { flow->deficit +=3D q->quantum; list_move_tail(&flow->flowchain, &q->old_flows); goto begin; } If you have one flow only, and it's over it's quantum, you go through this loop twice. If you have two flows and they are both over quantum, 3 times, but the next 2 times no more than once. Three flows, all over quantum, 4 times, but the 3 next 3 times through no more than once each. (this is assuming that quantum is set for mtu size packets) So you end up with times through the loop averaging less than 2. Then applying codel to the queue, codel will iterate through it's list of packets eventually delivering 1 or not. This too is short (function elided) skb =3D codel_dequeue(sch, &q->cparams, &flow->cvars, &q->cstats, dequeue); flow->dropped +=3D q->cstats.drop_count - prev_drop_count; flow->dropped +=3D q->cstats.ecn_mark - prev_ecn_mark; // the original fq_codel code would never hit this point below as codel alw= ays // stopped dropping at one packet remaining per queue. if (!skb) { /* force a pass through old_flows to prevent starvation */ if ((head =3D=3D &q->new_flows) && !list_empty(&q->old_flow= s)) list_move_tail(&flow->flowchain, &q->old_flows); else list_del_init(&flow->flowchain); goto begin; } As drop rates are typically measured in fractions of a percentage point, and IF codel empties a queue entirely and you have to select a new drr queue, you have the sum of these behaviors as your maximum overhead. Does QFQ meet your definition of a calendar queue model? On Fri, Jun 13, 2014 at 4:43 PM, Fred Baker (fred) wrote: > Thanks > > On Jun 13, 2014, at 4:04 PM, Dave Taht wrote: > >> Really excellent, Fred, on a first reading! >> >> nit 1) drops tend to happen in bursts on a tail drop queue (not >> necessarily on this bottleneck, but elsewhere on the network). By >> breaking up flows into sequences of distinctly different packets, this >> applies minor damage to more flows, instead of severe damage to one >> flow. >> >> I don't know where to put this or how to express it anywhere near as >> well as you expressed everything else. >> >> 2) weighted FQ algos like QFQ and WFQ are interesting from a >> take-advantage-of-diffserv perspective. I keep hoping to get a >> simplified and more fq_codel-like implementation of QFQ, in >> particular. >> >> 3) sch_fq is a *perfect* fq algo, instead of using a hash, it uses a >> red-black tree to keep track of all flows. While memory and compute >> intensive for a router, it's pretty awesome on hosts, and makes it >> possible to schedule (and pace) tcp flows at a level much closer to >> the driver hardware, using the same new/sparse vs persistent queue >> distinction fq_codel does. >> >> 4) While I think I finally understand your longstanding criticism of >> how aqm and scheduling technologies are indeed distinct, there is a >> parameter that must be >> shared globally between the two algorithms: the maximum overall queue >> length (governing worst case drop behavior). This is the basic flaw of >> applying >> (at least in linux) sfq, drr, qfq, htb, etc naively with a drop tail >> queue, as the maximum overall queue length is additive. >> >> Take for example a simple QoS setup >> >> filter that breaks up stuff into 4 QoS queues: >> >> drr 1 -> sfq limit 127 (prio) >> drr 2 -> sfq limit 127 (video) >> drr 3 -> sfq limit 127 (BE) >> drr 4 -> sfq limit 127 (background) >> >> So you end up with worst case drop tail and delay behavior for drr + >> sfq queue of 4*127 packets. If using weighted drr, the proportions >> change, but the worst case drop behavior does not. If using something >> like htb, the background queue has a worst case drop tail and delay >> behavior of 4*127, be, 3*127, and so on. Having a shared overall queue >> size is extremely important for being able to classify queues and get >> sane behavior. You could, for example, try using 32 packet queues to >> get the same overall worst case latency guarantee but you'd sacrifice >> bandwidth if the majority of traffic was BE only. >> >> This is less important with a system that tries to measure latency and >> be intelligent about drop behavior, but you still have worst case >> behavior that is additive in the case of non-responsive flows. >> >> 4a) The problem with using individual queues for something like >> pie-per-fq'd_queue, is that pie depends on being able to sample X >> number of packets in order to determine it's drop decision, which it >> may not get relevant to the overall load on the system for flows that >> are too small to tweak pie's estimator, yet worth dropping a packet >> from. >> >> 4b) and the opposite problem in codel, with a single codel queue >> taking fq'd packets (rather than one codel queue per fq) is the >> reliance on timestamps for dropping in and out of drop state, which >> doesn't work if you don't do the timestamp in the right place. >> >> >> (I'll no doubt find more nits later :) ) >> >> On Fri, Jun 13, 2014 at 3:07 PM, Fred Baker (fred) wrot= e: >>> I=E2=80=99d be interested in comments on this. >>> >>>> From: >>>> Subject: New Version Notification for draft-baker-aqm-sfq-implementati= on-00.txt >>>> Date: June 13, 2014 at 2:52:07 PM PDT >>>> To: Fred Baker , Rong Pan , Fred Bake= r , Rong Pan >>>> >>>> >>>> A new version of I-D, draft-baker-aqm-sfq-implementation-00.txt >>>> has been successfully submitted by Fred Baker and posted to the >>>> IETF repository. >>>> >>>> Name: draft-baker-aqm-sfq-implementation >>>> Revision: 00 >>>> Title: On Queuing, Marking, and Dropping >>>> Document date: 2014-06-13 >>>> Group: Individual Submission >>>> Pages: 14 >>>> URL: http://www.ietf.org/internet-drafts/draft-baker-aqm-sf= q-implementation-00.txt >>>> Status: https://datatracker.ietf.org/doc/draft-baker-aqm-sfq-i= mplementation/ >>>> Htmlized: http://tools.ietf.org/html/draft-baker-aqm-sfq-impleme= ntation-00 >>>> >>>> >>>> Abstract: >>>> This note discusses implementation strategies for coupled queuing and >>>> mark/drop algorithms. >>>> >>>> >>>> >>>> >>>> Please note that it may take a couple of minutes from the time of subm= ission >>>> until the htmlized version and diff are available at tools.ietf.org. >>>> >>>> The IETF Secretariat >>>> >>> >>> >>> _______________________________________________ >>> aqm mailing list >>> aqm@ietf.org >>> https://www.ietf.org/mailman/listinfo/aqm >>> >> >> >> >> -- >> Dave T=C3=A4ht >> >> NSFW: https://w2.eff.org/Censorship/Internet_censorship_bills/russell_02= 96_indecent.article > --=20 Dave T=C3=A4ht NSFW: https://w2.eff.org/Censorship/Internet_censorship_bills/russell_0296_= indecent.article From nobody Sat Jun 14 23:35:41 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5DCDF1B2D56 for ; Sat, 14 Jun 2014 23:35:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.852 X-Spam-Level: X-Spam-Status: No, score=-4.852 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-0.651, SPF_PASS=-0.001] autolearn=ham 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 Jwe8v7tfqrbU for ; Sat, 14 Jun 2014 23:35:38 -0700 (PDT) Received: from spey.erg.abdn.ac.uk (spey.erg.abdn.ac.uk [139.133.204.173]) by ietfa.amsl.com (Postfix) with ESMTP id 747961B2B7D for ; Sat, 14 Jun 2014 23:35:37 -0700 (PDT) Received: from www.erg.abdn.ac.uk (blake.erg.abdn.ac.uk [139.133.210.30]) by spey.erg.abdn.ac.uk (Postfix) with ESMTPSA id E368F2B44A7; Sun, 15 Jun 2014 07:35:34 +0100 (BST) Received: from 212.159.18.54 (SquirrelMail authenticated user gorry) by www.erg.abdn.ac.uk with HTTP; Sun, 15 Jun 2014 07:35:34 +0100 Message-ID: <28665de3137d14776198e51e9245a4e9.squirrel@www.erg.abdn.ac.uk> In-Reply-To: References: Date: Sun, 15 Jun 2014 07:35:34 +0100 From: gorry@erg.abdn.ac.uk To: "Dave Taht" User-Agent: SquirrelMail/1.4.22 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/szIjaMvrqTFO-TREV-T_i8icpGQ Cc: "aqm@ietf.org" Subject: Re: [aqm] AQM in every buffer? X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Jun 2014 06:35:40 -0000 Just to clarify, this was someone else's words from the list. They don't appear in this ID. I agree with what you have said below. I personally think in addition that this isn't desirable, because using AQM implies enforcing a traffic policy (e.g. with respect to flow bustiness, no of flows and path RTT), and it would be unfortunate if this policy were embedded in all equipment, it would in some cases constrain performance when there is no need. The draft motivates that key params should be externalised. Gorry > In the other long thread, gorry said something that didn't quite ring > true with me: > > "Our goal should be AQM in every buffer". > > Well, that's somewhat desirable but not doable (at least in my world) - > > 1) The device has sufficient buffering to get at least one packet out. > 2) There's a tx ring which puts packets for the device to pick up from > 3) In linux now (and some older cisco boxes) there is this thing > called "byte queue limits" which moderates the tx ring to only have > enough data in it to keep the device busy > 4) These layers gives the upper portions of the stack time to think > harder about what to put on the tx ring. > > *Ideally* an AQM should have a picture of the total buffering in the > system all the way to the wire, but in practice, at higher speeds, > once things are controlled by BQL, it's a trivial amount of extra > buffering. > > (this is partially why I get non-plussed by people dissing "drop head", > when > what's on the TX ring is already past the "drop head" point of the AQM > layer ) > > Now, I imagine that at least some hardware switches *could* have a > picture all the way to the wire, but doubt that it's feasible, also. > > -- > Dave Täht > > NSFW: > https://w2.eff.org/Censorship/Internet_censorship_bills/russell_0296_indecent.article > > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm > From nobody Sat Jun 14 23:36:51 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8E4E01B2D59 for ; Sat, 14 Jun 2014 23:36:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.852 X-Spam-Level: X-Spam-Status: No, score=-4.852 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-0.651, SPF_PASS=-0.001] autolearn=ham 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 0mqLHf2x9GG3 for ; Sat, 14 Jun 2014 23:36:48 -0700 (PDT) Received: from spey.erg.abdn.ac.uk (spey.erg.abdn.ac.uk [139.133.204.173]) by ietfa.amsl.com (Postfix) with ESMTP id 388BB1B2B65 for ; Sat, 14 Jun 2014 23:36:48 -0700 (PDT) Received: from www.erg.abdn.ac.uk (blake.erg.abdn.ac.uk [139.133.210.30]) by spey.erg.abdn.ac.uk (Postfix) with ESMTPSA id 66F9E2B44A7; Sun, 15 Jun 2014 07:36:47 +0100 (BST) Received: from 212.159.18.54 (SquirrelMail authenticated user gorry) by www.erg.abdn.ac.uk with HTTP; Sun, 15 Jun 2014 07:36:47 +0100 Message-ID: <45cb52e1d3614cde170bd011fea83090.squirrel@www.erg.abdn.ac.uk> In-Reply-To: References: Date: Sun, 15 Jun 2014 07:36:47 +0100 From: gorry@erg.abdn.ac.uk To: "Dave Taht" User-Agent: SquirrelMail/1.4.22 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/l3nP1uS7kf2S2enLORiwG1NPN3c Cc: "aqm@ietf.org" Subject: Re: [aqm] AQM in every buffer? X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Jun 2014 06:36:49 -0000 Just to clarify, this was someone else's words from the list. They don't appear in this ID. I agree with what you have said below. I personally think in addition that trying to manage every buffer isn't desirable, because using AQM implies enforcing a traffic policy (e.g. with respect to flow bustiness, no of flows and path RTT), and it would be unfortunate if this policy were embedded in all equipment, becasue it would in some cases constrain performance when there is no need. The draft motivates that key params should be externalised. Gorry > In the other long thread, gorry said something that didn't quite ring > true with me: > > "Our goal should be AQM in every buffer". > > Well, that's somewhat desirable but not doable (at least in my world) - > > 1) The device has sufficient buffering to get at least one packet out. > 2) There's a tx ring which puts packets for the device to pick up from > 3) In linux now (and some older cisco boxes) there is this thing > called "byte queue limits" which moderates the tx ring to only have > enough data in it to keep the device busy > 4) These layers gives the upper portions of the stack time to think > harder about what to put on the tx ring. > > *Ideally* an AQM should have a picture of the total buffering in the > system all the way to the wire, but in practice, at higher speeds, > once things are controlled by BQL, it's a trivial amount of extra > buffering. > > (this is partially why I get non-plussed by people dissing "drop head", > when > what's on the TX ring is already past the "drop head" point of the AQM > layer ) > > Now, I imagine that at least some hardware switches *could* have a > picture all the way to the wire, but doubt that it's feasible, also. > > -- > Dave Täht > > NSFW: > https://w2.eff.org/Censorship/Internet_censorship_bills/russell_0296_indecent.article > > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm > From nobody Wed Jun 18 08:10:32 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E455D1A0277 for ; Wed, 18 Jun 2014 08:10:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.55 X-Spam-Level: X-Spam-Status: No, score=-1.55 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HELO_EQ_FR=0.35, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=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 gjHw8YF7PDsz for ; Wed, 18 Jun 2014 08:10:28 -0700 (PDT) Received: from zproxy220.enst-bretagne.fr (zproxy220.enst-bretagne.fr [192.108.117.9]) by ietfa.amsl.com (Postfix) with ESMTP id A99E41A0285 for ; Wed, 18 Jun 2014 08:10:27 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by zproxy220.enst-bretagne.fr (Postfix) with ESMTP id 1BA3C30009 for ; Wed, 18 Jun 2014 17:10:27 +0200 (CEST) Received: from zproxy220.enst-bretagne.fr ([127.0.0.1]) by localhost (zproxy220.enst-bretagne.fr [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id 8E_C_CVXuosq for ; Wed, 18 Jun 2014 17:10:23 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by zproxy220.enst-bretagne.fr (Postfix) with ESMTP id DE6A238018 for ; Wed, 18 Jun 2014 17:10:23 +0200 (CEST) X-Virus-Scanned: amavisd-new at zproxy220.enst-bretagne.fr Received: from zproxy220.enst-bretagne.fr ([127.0.0.1]) by localhost (zproxy220.enst-bretagne.fr [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id Qv8O7aOnGUED for ; Wed, 18 Jun 2014 17:10:23 +0200 (CEST) Received: from [IPv6:2001:660:7301:3728:c045:24d9:2939:be42] (passerellev6v4.enst-bretagne.fr [192.108.117.5]) by zproxy220.enst-bretagne.fr (Postfix) with ESMTPSA id BFB25342DB for ; Wed, 18 Jun 2014 17:10:23 +0200 (CEST) From: Nicolas KUHN Content-Type: multipart/alternative; boundary="Apple-Mail=_9A52B3F3-D35C-4369-8BBC-31F0F214F178" Date: Wed, 18 Jun 2014 17:10:24 +0200 References: <20140618121012.6711.41870.idtracker@ietfa.amsl.com> To: "aqm@ietf.org" Message-Id: <59C44659-83EB-4A0F-9EA4-68C5F0F8BDDB@telecom-bretagne.eu> Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) X-Mailer: Apple Mail (2.1503) Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/3KmcF-TeBy8toDBglgaMhZWxT7Y Subject: [aqm] New Version Notification for draft-kuhn-aqm-eval-guidelines-01.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Jun 2014 15:10:31 -0000 --Apple-Mail=_9A52B3F3-D35C-4369-8BBC-31F0F214F178 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi,=20 We posted an updated of the evaluation guidelines draft in order to = facilitate the discussions during the AQM conference call on June 24th ( = 3rd point of the agenda = [http://www.ietf.org/mail-archive/web/aqm/current/msg00658.html]).=20 Kind regards,=20 The authors Begin forwarded message: > From: internet-drafts@ietf.org > Subject: New Version Notification for = draft-kuhn-aqm-eval-guidelines-01.txt > Date: June 18, 2014 2:10:12 PM GMT+02:00 > To: Nicolas Kuhn , "David Ros" = , David Ros , "Preethi Natarajan" = , "Naeem Khademi" , "Nicolas = Kuhn" , Preethi Natarajan = , Naeem Khademi >=20 >=20 > A new version of I-D, draft-kuhn-aqm-eval-guidelines-01.txt > has been successfully submitted by Nicolas Kuhn and posted to the > IETF repository. >=20 > Name: draft-kuhn-aqm-eval-guidelines > Revision: 01 > Title: AQM Evaluation Guidelines > Document date: 2014-06-18 > Group: Individual Submission > Pages: 25 > URL: = http://www.ietf.org/internet-drafts/draft-kuhn-aqm-eval-guidelines-01.txt > Status: = https://datatracker.ietf.org/doc/draft-kuhn-aqm-eval-guidelines/ > Htmlized: = http://tools.ietf.org/html/draft-kuhn-aqm-eval-guidelines-01 > Diff: = http://www.ietf.org/rfcdiff?url2=3Ddraft-kuhn-aqm-eval-guidelines-01 >=20 > Abstract: > Unmanaged large buffers in today's networks have given rise to a = slew > of performance issues. These performance issues can be addressed by > some form of Active Queue Management (AQM), optionally in = combination > with a packet scheduling scheme such as fair queuing. The IETF AQM > and packet scheduling working group was formed to standardize AQM > schemes that are robust, easily implemented, and successfully > deployed in today's networks. This document describes various > criteria for performing precautionary evaluations of AQM proposals. > This document also helps in ascertaining whether any given AQM > proposal should be taken up for standardization by the AQM WG. >=20 >=20 >=20 >=20 > Please note that it may take a couple of minutes from the time of = submission > until the htmlized version and diff are available at tools.ietf.org. >=20 > The IETF Secretariat >=20 --Apple-Mail=_9A52B3F3-D35C-4369-8BBC-31F0F214F178 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii ht= tp://www.ietf.org/mail-archive/web/aqm/current/msg00658.html]). <= /div>

Kind = regards, 

The = authors

Begin forwarded = message:

Subject: New Version Notification for = draft-kuhn-aqm-eval-guidelines-01.txt
Date: June 18, 2014 = 2:10:12 PM GMT+02:00
To: Nicolas Kuhn <nicolas.kuhn@telecom-bret= agne.eu>, "David Ros" <dros@simula.no>, David Ros <dros@simula.no>, "Preethi = Natarajan" <prenatar@cisco.com>, "Naeem = Khademi" <naeemk@ifi.uio.no>, "Nicolas = Kuhn" <nicolas.kuhn@telecom-bret= agne.eu>, Preethi Natarajan <prenatar@cisco.com>, Naeem = Khademi <naeemk@ifi.uio.no>


A new version of I-D, = draft-kuhn-aqm-eval-guidelines-01.txt
has been successfully submitted = by Nicolas Kuhn and posted to the
IETF repository.

Name: = draft-kuhn-aqm-eval-guidelines
Revision: = 01
Title: AQM Evaluation = Guidelines
Document date: 2014-06-18
Group: = Individual Submission
Pages: 25
URL: =            http://www.ietf.org/internet-drafts/draft-kuhn-aqm-eval-guideline= s-01.txt
Status: =         = https://datatracker.ietf.org/doc/draft-kuhn-aqm-eval-guidelines/
Ht= mlized:       http= ://tools.ietf.org/html/draft-kuhn-aqm-eval-guidelines-01
Diff: =           http://www.ietf.org/rfcdiff?url2=3Ddraft-kuhn-aqm-eval-guidelines-01

Abstract:
  Unmanaged large buffers in today's = networks have given rise to a slew
  of performance = issues.  These performance issues can be addressed by
=   some form of Active Queue Management (AQM), optionally in = combination
  with a packet scheduling scheme such as fair = queuing.  The IETF AQM
  and packet scheduling = working group was formed to standardize AQM
  schemes that = are robust, easily implemented, and successfully
=   deployed in today's networks.  This document describes = various
  criteria for performing precautionary = evaluations of AQM proposals.
  This document also helps = in ascertaining whether any given AQM
  proposal should be = taken up for standardization by the AQM WG.




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

The IETF = Secretariat


= --Apple-Mail=_9A52B3F3-D35C-4369-8BBC-31F0F214F178-- From nobody Thu Jun 19 20:13:08 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D9C391A01A5 for ; Thu, 19 Jun 2014 20:13:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.847 X-Spam-Level: X-Spam-Status: No, score=-1.847 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HELO_EQ_AU=0.377, HOST_EQ_AU=0.327, RP_MATCHES_RCVD=-0.651] autolearn=ham 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 MItQuIIMXik0 for ; Thu, 19 Jun 2014 20:13:02 -0700 (PDT) Received: from gpo2.cc.swin.edu.au (gpo2.cc.swin.edu.au [136.186.1.31]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E3F201A017F for ; Thu, 19 Jun 2014 20:13:01 -0700 (PDT) Received: from [136.186.229.37] (garmitage.caia.swin.edu.au [136.186.229.37]) by gpo2.cc.swin.edu.au (8.14.3/8.14.3) with ESMTP id s5K3CwG1025151 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 20 Jun 2014 13:12:59 +1000 Message-ID: <53A3A6B9.7030809@swin.edu.au> Date: Fri, 20 Jun 2014 13:12:57 +1000 From: grenville armitage User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:16.0) Gecko/20121107 Thunderbird/16.0.2 MIME-Version: 1.0 To: aqm@ietf.org References: <20140613215207.11613.75352.idtracker@ietfa.amsl.com> In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: quoted-printable Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/beUYGke1m95T7DU1bsc-QvDwHjo Subject: Re: [aqm] Fwd: New Version Notification for draft-baker-aqm-sfq-implementation-00.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Jun 2014 03:13:05 -0000 Fred, Just read it -- clear, easy to comprehend. I'd be happy pointing AQM newc= omers at it. One nit: Might be just me, but the Acknowledgements section feels more li= ke an editorial/opinion. For a newcomer to AQM it wouldn't necessarily be= clear how the body of the I-D supports the expressed opinion. cheers, gja On 06/14/2014 08:07, Fred Baker (fred) wrote: > I=92d be interested in comments on this. > >> From: >> Subject: New Version Notification for draft-baker-aqm-sfq-implementati= on-00.txt >> Date: June 13, 2014 at 2:52:07 PM PDT >> To: Fred Baker , Rong Pan , Fred Bake= r , Rong Pan >> >> >> A new version of I-D, draft-baker-aqm-sfq-implementation-00.txt >> has been successfully submitted by Fred Baker and posted to the >> IETF repository. >> >> Name: draft-baker-aqm-sfq-implementation >> Revision: 00 >> Title: On Queuing, Marking, and Dropping >> Document date: 2014-06-13 >> Group: Individual Submission >> Pages: 14 >> URL: http://www.ietf.org/internet-drafts/draft-baker-aqm-sf= q-implementation-00.txt >> Status: https://datatracker.ietf.org/doc/draft-baker-aqm-sfq-i= mplementation/ >> Htmlized: http://tools.ietf.org/html/draft-baker-aqm-sfq-impleme= ntation-00 >> >> >> Abstract: >> This note discusses implementation strategies for coupled queuing a= nd >> mark/drop algorithms. >> >> >> >> >> Please note that it may take a couple of minutes from the time of subm= ission >> until the htmlized version and diff are available at tools.ietf.org. >> >> The IETF Secretariat >> > > > > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm > --=20 Professor Grenville Armitage Director, Centre for Advanced Internet Architectures School of Software and Electrical Engineering Faculty of Science, Engineering and Technology Swinburne University of Technology, Australia http://caia.swin.edu.au From nobody Fri Jun 20 08:51:54 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7E4601B2840 for ; 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Fri, 20 Jun 2014 10:51:48 -0500 From: "Fred Baker (fred)" To: grenville armitage Thread-Topic: [aqm] New Version Notification for draft-baker-aqm-sfq-implementation-00.txt Thread-Index: AQHPjJ+LPzGxbxIHIU26OJ5eSOzH1A== Date: Fri, 20 Jun 2014 15:51:48 +0000 Message-ID: <4419FB4C-9410-41FB-A5FB-F46289F4E742@cisco.com> References: <20140613215207.11613.75352.idtracker@ietfa.amsl.com> <53A3A6B9.7030809@swin.edu.au> In-Reply-To: <53A3A6B9.7030809@swin.edu.au> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.19.64.123] Content-Type: multipart/signed; boundary="Apple-Mail=_CD2F44A1-E037-4524-8B81-343BD26E7FC2"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/tAjAXppmOHRVqfE4CTi07R8m1vY Cc: "aqm@ietf.org" Subject: Re: [aqm] New Version Notification for draft-baker-aqm-sfq-implementation-00.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Jun 2014 15:51:51 -0000 --Apple-Mail=_CD2F44A1-E037-4524-8B81-343BD26E7FC2 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 On Jun 19, 2014, at 8:12 PM, grenville armitage = wrote: > Fred, >=20 > Just read it -- clear, easy to comprehend. I'd be happy pointing AQM = newcomers at it. >=20 > One nit: Might be just me, but the Acknowledgements section feels more = like an editorial/opinion. For a newcomer to AQM it wouldn't necessarily = be clear how the body of the I-D supports the expressed opinion. Fair enough. The second sentence likely belongs in the conclusions. > cheers, > gja >=20 > On 06/14/2014 08:07, Fred Baker (fred) wrote: >> I=92d be interested in comments on this. >>=20 >>> From: >>> Subject: New Version Notification for = draft-baker-aqm-sfq-implementation-00.txt >>> Date: June 13, 2014 at 2:52:07 PM PDT >>> To: Fred Baker , Rong Pan , Fred = Baker , Rong Pan >>>=20 >>>=20 >>> A new version of I-D, draft-baker-aqm-sfq-implementation-00.txt >>> has been successfully submitted by Fred Baker and posted to the >>> IETF repository. >>>=20 >>> Name: draft-baker-aqm-sfq-implementation >>> Revision: 00 >>> Title: On Queuing, Marking, and Dropping >>> Document date: 2014-06-13 >>> Group: Individual Submission >>> Pages: 14 >>> URL: = http://www.ietf.org/internet-drafts/draft-baker-aqm-sfq-implementation-00.= txt >>> Status: = https://datatracker.ietf.org/doc/draft-baker-aqm-sfq-implementation/ >>> Htmlized: = http://tools.ietf.org/html/draft-baker-aqm-sfq-implementation-00 >>>=20 >>>=20 >>> Abstract: >>> This note discusses implementation strategies for coupled queuing = and >>> mark/drop algorithms. >>>=20 >>>=20 >>>=20 >>>=20 >>> Please note that it may take a couple of minutes from the time of = submission >>> until the htmlized version and diff are available at tools.ietf.org. >>>=20 >>> The IETF Secretariat >>>=20 >>=20 >>=20 >>=20 >> _______________________________________________ >> aqm mailing list >> aqm@ietf.org >> https://www.ietf.org/mailman/listinfo/aqm >>=20 >=20 > --=20 > Professor Grenville Armitage > Director, Centre for Advanced Internet Architectures > School of Software and Electrical Engineering > Faculty of Science, Engineering and Technology > Swinburne University of Technology, Australia > http://caia.swin.edu.au >=20 > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm --Apple-Mail=_CD2F44A1-E037-4524-8B81-343BD26E7FC2 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iD8DBQFTpFiRbjEdbHIsm0MRAhT7AJ9FwJT7j4LhmbzeqCzEwETe6WyHCACgkB/l Cu2Q2Rnwrbsf2qIt56eBSEc= =hfqP -----END PGP SIGNATURE----- --Apple-Mail=_CD2F44A1-E037-4524-8B81-343BD26E7FC2-- From nobody Sat Jun 21 18:11:54 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5E09E1B2848 for ; Sat, 21 Jun 2014 18:11:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.81 X-Spam-Level: X-Spam-Status: No, score=0.81 tagged_above=-999 required=5 tests=[BAYES_50=0.8, T_FILL_THIS_FORM_SHORT=0.01] autolearn=ham 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 Nd9oynrsXhjZ for ; Sat, 21 Jun 2014 18:11:44 -0700 (PDT) Received: from atl4mhob16.myregisteredsite.com (atl4mhob16.myregisteredsite.com [209.17.115.109]) by ietfa.amsl.com (Postfix) with ESMTP id E665F1B2835 for ; Sat, 21 Jun 2014 18:11:43 -0700 (PDT) Received: from mailpod.hostingplatform.com ([10.30.71.209]) by atl4mhob16.myregisteredsite.com (8.14.4/8.14.4) with ESMTP id s5M1Bert048136 for ; Sat, 21 Jun 2014 21:11:40 -0400 Received: (qmail 31257 invoked by uid 0); 22 Jun 2014 01:11:40 -0000 X-TCPREMOTEIP: 69.81.143.143 X-Authenticated-UID: wes@mti-systems.com Received: from unknown (HELO ?192.168.1.108?) (wes@mti-systems.com@69.81.143.143) by 0 with ESMTPA; 22 Jun 2014 01:11:40 -0000 Message-ID: <53A62D40.7060707@mti-systems.com> Date: Sat, 21 Jun 2014 21:11:28 -0400 From: Wesley Eddy Organization: MTI Systems User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: "aqm@ietf.org" Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/3R1gDXrKjCZ0C-xzAjxPN4qaq-s Subject: [aqm] reminder: AQM conference call X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 22 Jun 2014 01:11:52 -0000 None of the information below has changed since initially announced, but this is just a reminder that on Tuesday we'll have a conference call that everyone is welcome to dial into in order to discuss the ongoing AQM work and prepare for the Toronto meeting. Agenda ====== 1 - discuss overall WG status quickly 2 - discuss state of the 2309bis / recommendation draft - if any editors or people with comments are online, this will be a chance to discuss any remaining items that haven't converged through the mailing list yet 3 - discuss state of evaluation guidelines / scenarios - if one of the editors is available, we'd like them to share plans and status briefly 4 - discuss possibly adopting algorithms, as mentioned on the mailing list and get some feedback on this 5 - plan agenda for Toronto Webex and teleconference information ==================================== Topic: AQM Date: Tuesday, June 24, 2014 Time: 1:00 pm, Eastern Daylight Time (New York, GMT-04:00) Meeting Number: 644 364 555 Meeting Password: 1234 ------------------------------------------------------- To join the online meeting (Now from mobile devices!) ------------------------------------------------------- 1. Go to https://ietf.webex.com/ietf/j.php?MTID=ma8f0c666476fa3d8dd02ea205a46c036 2. If requested, enter your name and email address. 3. If a password is required, enter the meeting password: 1234 4. Click "Join". To view in other time zones or languages, please click the link: https://ietf.webex.com/ietf/j.php?MTID=mc8130e6e7792ca3024a9d7769782a4ba ------------------------------------------------------- To join the audio conference only ------------------------------------------------------- Call-in toll number (US/Canada): 1-650-479-3208 Access code:644 364 555 ------------------------------------------------------- For assistance ------------------------------------------------------- 1. Go to https://ietf.webex.com/ietf/mc 2. On the left navigation bar, click "Support". You can contact me at: cmorgan@amsl.com 1-510-492-4085 To add this meeting to your calendar program (for example Microsoft Outlook), click this link: https://ietf.webex.com/ietf/j.php?MTID=m8c5e445ca347986e1d4d6cd7ee8abb3a The playback of UCF (Universal Communications Format) rich media files requires appropriate players. To view this type of rich media files in the meeting, please check whether you have the players installed on your computer by going to https://ietf.webex.com/ietf/systemdiagnosis.php. -- Wes Eddy MTI Systems From nobody Mon Jun 23 06:32:15 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C41801B2940 for ; Mon, 23 Jun 2014 06:32:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.853 X-Spam-Level: X-Spam-Status: No, score=-4.853 tagged_above=-999 required=5 tests=[BAYES_50=0.8, RCVD_IN_DNSWL_HI=-5, RP_MATCHES_RCVD=-0.651, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham 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 46W4KkiP5Ktz for ; Mon, 23 Jun 2014 06:32:09 -0700 (PDT) Received: from mx12.netapp.com (mx12.netapp.com [216.240.18.77]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 596281B292E for ; Mon, 23 Jun 2014 06:32:09 -0700 (PDT) X-IronPort-AV: E=Sophos;i="5.01,530,1400050800"; d="scan'208";a="171767091" Received: from vmwexceht04-prd.hq.netapp.com ([10.106.77.34]) by mx12-out.netapp.com with ESMTP; 23 Jun 2014 06:32:09 -0700 Received: from HIOEXCMBX03-PRD.hq.netapp.com (10.122.105.36) by vmwexceht04-prd.hq.netapp.com (10.106.77.34) with Microsoft SMTP Server (TLS) id 14.3.123.3; Mon, 23 Jun 2014 06:32:09 -0700 Received: from HIOEXCMBX05-PRD.hq.netapp.com (10.122.105.38) by hioexcmbx03-prd.hq.netapp.com (10.122.105.36) with Microsoft SMTP Server (TLS) id 15.0.847.32; Mon, 23 Jun 2014 06:32:08 -0700 Received: from HIOEXCMBX05-PRD.hq.netapp.com ([::1]) by hioexcmbx05-prd.hq.netapp.com ([fe80::b0c8:2b85:3071:3540%21]) with mapi id 15.00.0847.030; Mon, 23 Jun 2014 06:32:07 -0700 From: "Scheffenegger, Richard" To: "Fred Baker (fred)" , grenville armitage Thread-Topic: [aqm] New Version Notification for draft-baker-aqm-sfq-implementation-00.txt Thread-Index: AQHPjJ+VyNtiV8SFlkKPssL/TDfHs5t+tGSA Date: Mon, 23 Jun 2014 13:32:07 +0000 Message-ID: <98e111430e4b4e28ab7b86c860e665fc@hioexcmbx05-prd.hq.netapp.com> References: <20140613215207.11613.75352.idtracker@ietfa.amsl.com> <53A3A6B9.7030809@swin.edu.au> <4419FB4C-9410-41FB-A5FB-F46289F4E742@cisco.com> In-Reply-To: <4419FB4C-9410-41FB-A5FB-F46289F4E742@cisco.com> Accept-Language: de-AT, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.122.56.79] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/V2Im40BSp8fq1v1p2yBZRvMBPlk Cc: "aqm@ietf.org" Subject: Re: [aqm] New Version Notification for draft-baker-aqm-sfq-implementation-00.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Jun 2014 13:32:13 -0000 Hi Fred, thank you for writing this down; one aspect that gets referred to, but not = made completely explicit in sections 3.2 and 3.3 is the interaction of the = AQM / Queue signals with the transport control loop. IMHO, it should be made very clear, when the AQM action is done before the = queueing, that the AQM signal is delayed for the outer control loop; obviou= sly in a defensive loss situation, this will always be the case. In compari= son, when the Queue prepends the AQM action, the AQM signal is delayed less= to the outer control loop. Depending on the depth of the queue / departure rate, that timing differenc= e can be significant... I don't know how to put that into better words that would fit into your dra= ft though. Best regards, Richard Scheffenegger > -----Original Message----- > From: aqm [mailto:aqm-bounces@ietf.org] On Behalf Of Fred Baker (fred) > Sent: Freitag, 20. Juni 2014 17:52 > To: grenville armitage > Cc: aqm@ietf.org > Subject: Re: [aqm] New Version Notification for draft-baker-aqm-sfq- > implementation-00.txt >=20 >=20 > On Jun 19, 2014, at 8:12 PM, grenville armitage > wrote: >=20 > > Fred, > > > > Just read it -- clear, easy to comprehend. I'd be happy pointing AQM > newcomers at it. > > > > One nit: Might be just me, but the Acknowledgements section feels more > like an editorial/opinion. For a newcomer to AQM it wouldn't necessarily > be clear how the body of the I-D supports the expressed opinion. >=20 > Fair enough. The second sentence likely belongs in the conclusions. >=20 > > cheers, > > gja > > > > On 06/14/2014 08:07, Fred Baker (fred) wrote: > >> I'd be interested in comments on this. > >> > >>> From: > >>> Subject: New Version Notification for > >>> draft-baker-aqm-sfq-implementation-00.txt > >>> Date: June 13, 2014 at 2:52:07 PM PDT > >>> To: Fred Baker , Rong Pan , Fred > >>> Baker , Rong Pan > >>> > >>> > >>> A new version of I-D, draft-baker-aqm-sfq-implementation-00.txt > >>> has been successfully submitted by Fred Baker and posted to the IETF > >>> repository. > >>> > >>> Name: draft-baker-aqm-sfq-implementation > >>> Revision: 00 > >>> Title: On Queuing, Marking, and Dropping > >>> Document date: 2014-06-13 > >>> Group: Individual Submission > >>> Pages: 14 > >>> URL: http://www.ietf.org/internet-drafts/draft-baker-aqm- > sfq-implementation-00.txt > >>> Status: https://datatracker.ietf.org/doc/draft-baker-aqm-sfq- > implementation/ > >>> Htmlized: http://tools.ietf.org/html/draft-baker-aqm-sfq- > implementation-00 > >>> > >>> > >>> Abstract: > >>> This note discusses implementation strategies for coupled queuing > and > >>> mark/drop algorithms. > >>> > >>> > >>> > >>> > >>> Please note that it may take a couple of minutes from the time of > >>> submission until the htmlized version and diff are available at > tools.ietf.org. > >>> > >>> The IETF Secretariat > >>> > >> > >> > >> > >> _______________________________________________ > >> aqm mailing list > >> aqm@ietf.org > >> https://www.ietf.org/mailman/listinfo/aqm > >> > > > > -- > > Professor Grenville Armitage > > Director, Centre for Advanced Internet Architectures School of > > Software and Electrical Engineering Faculty of Science, Engineering > > and Technology Swinburne University of Technology, Australia > > http://caia.swin.edu.au > > > > _______________________________________________ > > aqm mailing list > > aqm@ietf.org > > https://www.ietf.org/mailman/listinfo/aqm From nobody Tue Jun 24 00:41:23 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EB56D1B2878 for ; 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Tue, 24 Jun 2014 02:41:11 -0500 From: "Fred Baker (fred)" To: "Scheffenegger, Richard" Thread-Topic: [aqm] New Version Notification for draft-baker-aqm-sfq-implementation-00.txt Thread-Index: AQHPj3+rNNCSeGKF8U2qCDwctFMKyw== Date: Tue, 24 Jun 2014 07:41:11 +0000 Message-ID: <4A20A0BD-1DF4-49AC-856A-B0FD73AADFC1@cisco.com> References: <20140613215207.11613.75352.idtracker@ietfa.amsl.com> <53A3A6B9.7030809@swin.edu.au> <4419FB4C-9410-41FB-A5FB-F46289F4E742@cisco.com> <98e111430e4b4e28ab7b86c860e665fc@hioexcmbx05-prd.hq.netapp.com> In-Reply-To: <98e111430e4b4e28ab7b86c860e665fc@hioexcmbx05-prd.hq.netapp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.19.64.121] Content-Type: multipart/signed; boundary="Apple-Mail=_03304157-1452-4EB9-AAA1-86B659DC798C"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/Kt7lmt5vwrMzp-gb-aMiejd2h5Y Cc: "aqm@ietf.org" , grenville armitage Subject: Re: [aqm] New Version Notification for draft-baker-aqm-sfq-implementation-00.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jun 2014 07:41:21 -0000 --Apple-Mail=_03304157-1452-4EB9-AAA1-86B659DC798C Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 On Jun 23, 2014, at 6:32 AM, Scheffenegger, Richard = wrote: > >=20 > Hi Fred, >=20 > thank you for writing this down; one aspect that gets referred to, but = not made completely explicit in sections 3.2 and 3.3 is the interaction = of the AQM / Queue signals with the transport control loop. >=20 > IMHO, it should be made very clear, when the AQM action is done before = the queueing, that the AQM signal is delayed for the outer control loop; = obviously in a defensive loss situation, this will always be the case. = In comparison, when the Queue prepends the AQM action, the AQM signal is = delayed less to the outer control loop. >=20 > Depending on the depth of the queue / departure rate, that timing = difference can be significant... >=20 > I don't know how to put that into better words that would fit into = your draft though. >=20 > Best regards, >=20 > Richard Scheffenegger I can go into that if you want. My logic here goes something like this. You can think of a TCP session as a control loop stuck into the middle = of a larger stream. Imagine I=92m moving a gigabyte file from here to = there, the MSS is 1440 bytes (an IPv6 packet containing it is 1500 = bytes), the bottleneck link between =93here=94 and =93there=94 is some = specific rate, and the propagation delay between =93here=94 and =93there=94= is some non-trivial value. The least effective window that would = maximize throughput is the number of segments that could fully use the = bottleneck capacity; any additional quantum that is there sits in a = queue and increases the RTT. So at any given point in time, we can think = of the transfer as having several components: K segments that are actually =93in flight=94 somewhere An additional K segments that hack been received and whose acks are = in flight. cwnd-2*K segments sitting in a queue, probably at the bottleneck. Some number of bytes that haven=92t been transmitted yet of those, the next cwnd segments will be transmitted as acks = arrive. Some number of bytes that have already been received at the far end = but not delivered yet to the application Zero or more segments that have been received out of order and are = being held pending retransmission Now, let=92s mark a specific segment; I=92ll call it segment N. I don=92t = really care what the value of N is. But it is the segment that the AQM = algorithm will select and drop, by whatever algorithm it decides. In a = tail-drop case, for the sake of argument, we can assert that the entire = cwnd segments are between segment N and the receiver or are represented = in acknowledgments on their way back. In a head-drop case, there are = cwnd-2K segments sitting in the queue after segment N, K segments = between it and the receiver, and K acks in flight. +------+ +--------+ +--------+ | | | Queue |Data K segments | | | +----->+ +----> - - - - ------->+ | |Sender| |Router 1| |Receiver| | +<-----+ +<---- - - - - <-------+ | | | | |Acks K acks | | +------+ +--------+ +--------+ So now, the whole thing rotates clockwise.=20 1) K segments already in flight arrive and are acknowledged while K acks = arrive at the sender and trigger new transmissions. The queue still has = cwnd-2*K segments in it. 2) depending on whether it was head drop or tail drop, somewhere between = zero and cwnd-2*K segments arrive and are acknowledged while as many = acks are received at the sender and trigger new transmissions. The queue = still has cwnd-2*K segments in it. 3) the missed packet is detected by the receiver, who starts responding = with duplicate acks. However, there are still K acks in flight, so the = sender is going to send another K new packets before he even sees the = first dupack. The queue still has cwnd-2*K segments in it. 4) we now get a long stream of dupacks, and the sender presumably = retransmits the dropped packet. AT THIS POINT, SENDER REDUCES CWND. If = more than one packet got dropped, let=92s hope the SACK logic = retransmits it as well. 5) At long last, the retransmission arrives at the receiver, who sends a = giant ack and starts sending a stream of acks, triggering new = transmissions. To determine the difference between head-drop and tail-drop, we have to = ask ourselves how big cwnd-2*K is. If we are using traditional = too-full-drop-something without AQM, it might be a largish number (it = could be the size of the memory allocated to the queue if there is no = competing traffic), and it is probably fair to say that head-drop would = get the event back to the sender more rapidly than tail-drop. If we are using any AQM technology - RED, WRED, ARED, PIE, CoDel, Blue, = AVQ, or whatever else, the fundamental purpose of the logic is to keep = the queue relatively shallow, even if it ha a large memory system behind = it. In RED terms, we would estimate that the mean queue depth will = approximate min-threshold or less; each of the other technologies has = its counterpart to that and will similarly keep the latency and/or queue = depth down. Hence, cwnd-2*K is a function of the mean queue depth at the bottleneck, = and is a relatively small number. Hence, if we=92re using an AQM = algorithm - any AQM algorithm as long as it works - the real differences = between had-drop and tail-drop is a relatively small number. Which makes me ask - what are we really talking about? Does it actually = matter? --Apple-Mail=_03304157-1452-4EB9-AAA1-86B659DC798C Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iD8DBQFTqSuVbjEdbHIsm0MRAu8TAJ940pch9+FOWqyuwKPTvsncb9tN5gCgxZiL iWWkJe1gEiqkM53yFPusHGo= =nTCW -----END PGP SIGNATURE----- --Apple-Mail=_03304157-1452-4EB9-AAA1-86B659DC798C-- From nobody Tue Jun 24 01:19:17 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BA4691B2896 for ; Tue, 24 Jun 2014 01:19:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.55 X-Spam-Level: X-Spam-Status: No, score=-1.55 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HELO_EQ_FR=0.35, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=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 1Qbj8FTtxSJn for ; Tue, 24 Jun 2014 01:19:13 -0700 (PDT) Received: from zproxy220.enst-bretagne.fr (zproxy220.enst-bretagne.fr [192.108.117.9]) by ietfa.amsl.com (Postfix) with ESMTP id 471FF1B287C for ; Tue, 24 Jun 2014 01:19:11 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by zproxy220.enst-bretagne.fr (Postfix) with ESMTP id B8EBB30223 for ; Tue, 24 Jun 2014 10:19:10 +0200 (CEST) Received: from zproxy220.enst-bretagne.fr ([127.0.0.1]) by localhost (zproxy220.enst-bretagne.fr [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id zo9VpBA8COyB for ; Tue, 24 Jun 2014 10:19:07 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by zproxy220.enst-bretagne.fr (Postfix) with ESMTP id 402EC30230 for ; Tue, 24 Jun 2014 10:19:07 +0200 (CEST) X-Virus-Scanned: amavisd-new at zproxy220.enst-bretagne.fr Received: from zproxy220.enst-bretagne.fr ([127.0.0.1]) by localhost (zproxy220.enst-bretagne.fr [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id LKhrFPATeXhV for ; Tue, 24 Jun 2014 10:19:07 +0200 (CEST) Received: from [IPv6:2001:660:7301:3728:5d02:bcf7:a8c6:d2fa] (passerellev6v4.enst-bretagne.fr [192.108.117.5]) by zproxy220.enst-bretagne.fr (Postfix) with ESMTPSA id 0425930224 for ; Tue, 24 Jun 2014 10:19:07 +0200 (CEST) From: Nicolas KUHN Content-Type: multipart/alternative; boundary="Apple-Mail=_5A46817F-59A5-4F19-BA7E-222B90DE936F" Message-Id: <961B3C27-6FD8-4C2F-8257-4F32BD76D96B@telecom-bretagne.eu> Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) Date: Tue, 24 Jun 2014 10:19:06 +0200 References: <20140618121012.6711.41870.idtracker@ietfa.amsl.com> <59C44659-83EB-4A0F-9EA4-68C5F0F8BDDB@telecom-bretagne.eu> To: "aqm@ietf.org" In-Reply-To: <59C44659-83EB-4A0F-9EA4-68C5F0F8BDDB@telecom-bretagne.eu> X-Mailer: Apple Mail (2.1503) Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/irB_Vhq4_njhpGHq-IL3ysD6Q00 Subject: Re: [aqm] New Version Notification for draft-kuhn-aqm-eval-guidelines-01.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jun 2014 08:19:15 -0000 --Apple-Mail=_5A46817F-59A5-4F19-BA7E-222B90DE936F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi all,=20 In order to prepare the meeting later today, and more specifically the = points on the "AQM Evaluation Guidelines", we have: - updated the document [ = http://tools.ietf.org/html/draft-kuhn-aqm-eval-guidelines-01 ] - prepared presentation slides [attached to this email] that explains = our choices. We will refer to these slides during the meeting. Kind regards,=20 The authors On Jun 18, 2014, at 5:10 PM, Nicolas KUHN = wrote: > Hi,=20 >=20 > We posted an updated of the evaluation guidelines draft in order to = facilitate the discussions during the AQM conference call on June 24th ( = 3rd point of the agenda = [http://www.ietf.org/mail-archive/web/aqm/current/msg00658.html]).=20 >=20 > Kind regards,=20 >=20 > The authors >=20 > Begin forwarded message: >=20 >> From: internet-drafts@ietf.org >> Subject: New Version Notification for = draft-kuhn-aqm-eval-guidelines-01.txt >> Date: June 18, 2014 2:10:12 PM GMT+02:00 >> To: Nicolas Kuhn , "David Ros" = , David Ros , "Preethi Natarajan" = , "Naeem Khademi" , "Nicolas = Kuhn" , Preethi Natarajan = , Naeem Khademi >>=20 >>=20 >> A new version of I-D, draft-kuhn-aqm-eval-guidelines-01.txt >> has been successfully submitted by Nicolas Kuhn and posted to the >> IETF repository. >>=20 >> Name: draft-kuhn-aqm-eval-guidelines >> Revision: 01 >> Title: AQM Evaluation Guidelines >> Document date: 2014-06-18 >> Group: Individual Submission >> Pages: 25 >> URL: = http://www.ietf.org/internet-drafts/draft-kuhn-aqm-eval-guidelines-01.txt >> Status: = https://datatracker.ietf.org/doc/draft-kuhn-aqm-eval-guidelines/ >> Htmlized: = http://tools.ietf.org/html/draft-kuhn-aqm-eval-guidelines-01 >> Diff: = http://www.ietf.org/rfcdiff?url2=3Ddraft-kuhn-aqm-eval-guidelines-01 >>=20 >> Abstract: >> Unmanaged large buffers in today's networks have given rise to a = slew >> of performance issues. These performance issues can be addressed = by >> some form of Active Queue Management (AQM), optionally in = combination >> with a packet scheduling scheme such as fair queuing. The IETF AQM >> and packet scheduling working group was formed to standardize AQM >> schemes that are robust, easily implemented, and successfully >> deployed in today's networks. This document describes various >> criteria for performing precautionary evaluations of AQM proposals. >> This document also helps in ascertaining whether any given AQM >> proposal should be taken up for standardization by the AQM WG. >>=20 >>=20 >>=20 >>=20 >> Please note that it may take a couple of minutes from the time of = submission >> until the htmlized version and diff are available at tools.ietf.org. >>=20 >> The IETF Secretariat >>=20 >=20 --Apple-Mail=_5A46817F-59A5-4F19-BA7E-222B90DE936F Content-Type: multipart/mixed; boundary="Apple-Mail=_97639114-ACB3-4E54-B3F9-C12A4CEE3218" --Apple-Mail=_97639114-ACB3-4E54-B3F9-C12A4CEE3218 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=us-ascii Hi all, 

In order to prepare the meeting later today, and more specifically the points on the "AQM Evaluation Guidelines", we have:
- prepared presentation slides [attached to this email] that explains our choices. We will refer to these slides during the meeting.

Kind regards, 

The authors

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CnN0YXJ0eHJlZgo3NDc1MQolJUVPRgo= --Apple-Mail=_97639114-ACB3-4E54-B3F9-C12A4CEE3218 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii nicolas.kuhn@telecom-bret= agne.eu> wrote:
Hi, 

We = posted an updated of the evaluation guidelines draft in order to = facilitate the discussions during the AQM conference call on June = 24th ( 3rd point of the agenda [ht= tp://www.ietf.org/mail-archive/web/aqm/current/msg00658.html]). <= /div>

Kind = regards, 

The = authors

Begin forwarded = message:

Subject: New Version = Notification for = draft-kuhn-aqm-eval-guidelines-01.txt
Date: June 18, 2014 2:10:12 PM = GMT+02:00
To: Nicolas Kuhn <nicolas.kuhn@telecom-bret= agne.eu>, "David Ros" <dros@simula.no>, David Ros <dros@simula.no>, "Preethi = Natarajan" <prenatar@cisco.com>, "Naeem = Khademi" <naeemk@ifi.uio.no>, "Nicolas = Kuhn" <nicolas.kuhn@telecom-bret= agne.eu>, Preethi Natarajan <prenatar@cisco.com>, Naeem = Khademi <naeemk@ifi.uio.no>


A new version of I-D, = draft-kuhn-aqm-eval-guidelines-01.txt
has been successfully submitted = by Nicolas Kuhn and posted to the
IETF repository.

Name: = draft-kuhn-aqm-eval-guidelines
Revision: = 01
Title: AQM Evaluation = Guidelines
Document date: 2014-06-18
Group: = Individual Submission
Pages: 25
URL: =            http://www.ietf.org/internet-drafts/draft-kuhn-aqm-eval-guideline= s-01.txt
Status: =         = https://datatracker.ietf.org/doc/draft-kuhn-aqm-eval-guidelines/
Ht= mlized:       http= ://tools.ietf.org/html/draft-kuhn-aqm-eval-guidelines-01
Diff: =           http://www.ietf.org/rfcdiff?url2=3Ddraft-kuhn-aqm-eval-guidelines-01

Abstract:
  Unmanaged large buffers in today's = networks have given rise to a slew
  of performance = issues.  These performance issues can be addressed by
=   some form of Active Queue Management (AQM), optionally in = combination
  with a packet scheduling scheme such as fair = queuing.  The IETF AQM
  and packet scheduling = working group was formed to standardize AQM
  schemes that = are robust, easily implemented, and successfully
=   deployed in today's networks.  This document describes = various
  criteria for performing precautionary = evaluations of AQM proposals.
  This document also helps = in ascertaining whether any given AQM
  proposal should be = taken up for standardization by the AQM WG.




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

The IETF = Secretariat


<= /div>
= --Apple-Mail=_97639114-ACB3-4E54-B3F9-C12A4CEE3218-- --Apple-Mail=_5A46817F-59A5-4F19-BA7E-222B90DE936F-- From nobody Tue Jun 24 08:17:16 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 54A4F1B2ADC; Tue, 24 Jun 2014 08:17:12 -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] autolearn=ham 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 KQdRDyRMvRtx; Tue, 24 Jun 2014 08:17:09 -0700 (PDT) Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 7A6321B2D71; Tue, 24 Jun 2014 08:16:07 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: i-d-announce@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 5.5.0.p3 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <20140624151607.4721.70974.idtracker@ietfa.amsl.com> Date: Tue, 24 Jun 2014 08:16:07 -0700 Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/-oWbKtQuYFnMkgRAGX0dL4olj6Y Cc: aqm@ietf.org Subject: [aqm] I-D Action: draft-ietf-aqm-recommendation-05.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jun 2014 15:17:12 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Active Queue Management and Packet Scheduling Working Group of the IETF. Title : IETF Recommendations Regarding Active Queue Management Authors : Fred Baker Godred Fairhurst Filename : draft-ietf-aqm-recommendation-05.txt Pages : 26 Date : 2014-06-24 Abstract: This memo presents recommendations to the Internet community concerning measures to improve and preserve Internet performance. It presents a strong recommendation for testing, standardization, and widespread deployment of active queue management (AQM) in network devices, to improve the performance of today's Internet. It also urges a concerted effort of research, measurement, and ultimate deployment of AQM mechanisms to protect the Internet from flows that are not sufficiently responsive to congestion notification. The note largely repeats the recommendations of RFC 2309, updated after fifteen years of experience and new research. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-aqm-recommendation/ There's also a htmlized version available at: http://tools.ietf.org/html/draft-ietf-aqm-recommendation-05 A diff from the previous version is available at: http://www.ietf.org/rfcdiff?url2=draft-ietf-aqm-recommendation-05 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Tue Jun 24 08:34:54 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C67491B2B00 for ; Tue, 24 Jun 2014 08:34:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.831 X-Spam-Level: X-Spam-Status: No, score=-3.831 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, MISSING_HEADERS=1.021, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-0.651, SPF_PASS=-0.001] autolearn=ham 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 7EPWoPM1SzA7 for ; Tue, 24 Jun 2014 08:34:45 -0700 (PDT) Received: from spey.erg.abdn.ac.uk (spey.erg.abdn.ac.uk [139.133.204.173]) by ietfa.amsl.com (Postfix) with ESMTP id EE19B1B2DF0 for ; Tue, 24 Jun 2014 08:31:28 -0700 (PDT) Received: by spey.erg.abdn.ac.uk (Postfix, from userid 5001) id 565B02B44D5; Tue, 24 Jun 2014 16:31:28 +0100 (BST) Received: from ERG-research.local (gorry-mac.erg.abdn.ac.uk [139.133.207.5]) by spey.erg.abdn.ac.uk (Postfix) with ESMTPSA id 97C012B4271 for ; Tue, 24 Jun 2014 16:31:27 +0100 (BST) Message-ID: <53A999CF.503@erg.abdn.ac.uk> Date: Tue, 24 Jun 2014 16:31:27 +0100 From: Gorry Fairhurst Organization: The University of Aberdeen is a charity registered in Scotland, No SC013683. User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 CC: aqm@ietf.org References: <20140624151607.4721.70974.idtracker@ietfa.amsl.com> In-Reply-To: <20140624151607.4721.70974.idtracker@ietfa.amsl.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/ael2l-gmEZElu05CMPM8hEztAWw Subject: [aqm] New revision: draft-ietf-aqm-recommendation-05.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: gorry@erg.abdn.ac.uk List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jun 2014 15:34:50 -0000 I've just uploaded a new revision that implements (we hope) the text promised in: http://www.ietf.org/mail-archive/web/aqm/current/msg00663.html The complete diff following end of the the WGLC can be seen here: https://www.ietf.org/rfcdiff?url1=draft-ietf-aqm-recommendation-03&difftype=--html&submit=Go%21&url2=draft-ietf-aqm-recommendation-05 We'd be happy to know if there are further comments, or whether this is sufficient to answer the issues that were rasied. Gorry On 24/06/2014 16:16, internet-drafts@ietf.org wrote: > > A New Internet-Draft is available from the on-line Internet-Drafts directories. > This draft is a work item of the Active Queue Management and Packet Scheduling Working Group of the IETF. > > Title : IETF Recommendations Regarding Active Queue Management > Authors : Fred Baker > Godred Fairhurst > Filename : draft-ietf-aqm-recommendation-05.txt > Pages : 26 > Date : 2014-06-24 > > Abstract: > This memo presents recommendations to the Internet community > concerning measures to improve and preserve Internet performance. It > presents a strong recommendation for testing, standardization, and > widespread deployment of active queue management (AQM) in network > devices, to improve the performance of today's Internet. It also > urges a concerted effort of research, measurement, and ultimate > deployment of AQM mechanisms to protect the Internet from flows that > are not sufficiently responsive to congestion notification. > > The note largely repeats the recommendations of RFC 2309, updated > after fifteen years of experience and new research. > > > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-aqm-recommendation/ > > There's also a htmlized version available at: > http://tools.ietf.org/html/draft-ietf-aqm-recommendation-05 > > A diff from the previous version is available at: > http://www.ietf.org/rfcdiff?url2=draft-ietf-aqm-recommendation-05 > > > Please note that it may take a couple of minutes from the time of submission > until the htmlized version and diff are available at tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ > > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm > From nobody Tue Jun 24 11:28:01 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 89AD11B2AE3 for ; Tue, 24 Jun 2014 11:27:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 1.5 X-Spam-Level: * X-Spam-Status: No, score=1.5 tagged_above=-999 required=5 tests=[BAYES_60=1.5, RCVD_IN_DNSWL_NONE=-0.0001] autolearn=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 exc7fRJBNnW5 for ; Tue, 24 Jun 2014 11:27:57 -0700 (PDT) Received: from atl4mhob10.myregisteredsite.com (atl4mhob10.myregisteredsite.com [209.17.115.48]) by ietfa.amsl.com (Postfix) with ESMTP id 965E51B2961 for ; Tue, 24 Jun 2014 11:27:57 -0700 (PDT) Received: from mailpod.hostingplatform.com ([10.30.71.203]) by atl4mhob10.myregisteredsite.com (8.14.4/8.14.4) with ESMTP id s5OIRtxE008334 for ; Tue, 24 Jun 2014 14:27:55 -0400 Received: (qmail 2135 invoked by uid 0); 24 Jun 2014 18:27:55 -0000 X-TCPREMOTEIP: 69.81.143.143 X-Authenticated-UID: wes@mti-systems.com Received: from unknown (HELO ?192.168.1.108?) (wes@mti-systems.com@69.81.143.143) by 0 with ESMTPA; 24 Jun 2014 18:27:55 -0000 Message-ID: <53A9C31A.8080200@mti-systems.com> Date: Tue, 24 Jun 2014 14:27:38 -0400 From: Wesley Eddy Organization: MTI Systems User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: "aqm@ietf.org" Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/ZaRsymueiT6pTwHJwLLJ_E034lM Subject: [aqm] references on global sync & lock-out X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jun 2014 18:27:59 -0000 Per the discussion in the telecon today about references for global synchronization and lock-out, I think some excellent classic ones are: Global Synchronization: Zhang & Clark, "Oscillating Behavior of Network Traffic: A Case Study Simulation", 1990 http://groups.csail.mit.edu/ana/Publications/Zhang-DDC-Oscillating-Behavior-of-Network-Traffic-1990.pdf Floyd & Jacobson, "The Synchronization of Periodic Routing Messages", 1994 http://ee.lbl.gov/papers/sync_94.pdf Lock-Out: Floyd & Jacobson, "On Traffic Phase Effects in Packet-Switched Gateways", 1992 http://www.icir.org/floyd/papers/phase.pdf -- Wes Eddy MTI Systems From nobody Tue Jun 24 12:11:23 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 47A301B2EDF for ; Tue, 24 Jun 2014 12:11:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.7 X-Spam-Level: X-Spam-Status: No, score=0.7 tagged_above=-999 required=5 tests=[BAYES_50=0.8, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-0.001] autolearn=ham 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 RSxo2_rQoL1u for ; Tue, 24 Jun 2014 12:11:13 -0700 (PDT) Received: from mail-ob0-x234.google.com (mail-ob0-x234.google.com [IPv6:2607:f8b0:4003:c01::234]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 884551B2EDC for ; Tue, 24 Jun 2014 12:11:06 -0700 (PDT) Received: by mail-ob0-f180.google.com with SMTP id vb8so855545obc.39 for ; Tue, 24 Jun 2014 12:11:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=H7AnBoBsiZlAgyIFO1xMzp3/X3fIS7NzpDFI+A+eAow=; b=GxVK5qoqZHhfHTf3yQNpaWaexctGrrKjJ5Miunez6n311kyNaI5obh22/HnlZV+7Om PyaDu+bJGNRc8dIqzb2or4An5nqZxUO2pyOtOZKtyNw3hGeGBnAhzM/sYSIHr32GQWwn +aJEKiw6HGoDkQTHQbn+Tq8FfZPUmNCZOET3Dlo3BmXj/480Vio10xD8NUQ3EfCKJmQq Z3BFJtsz2baDcH1bZwsVp88Ta7z+VV4HhLlyz71wZnxzAD6Llf2PwXkXJE1uZ42UFQ6s Ps7tlsNQ58Ae+OHPYh8+K6RSpKPRg/hKb/I9Hg1QJ24D3v5JjNZPqNcaEPx9Qyp6rNXa QJug== MIME-Version: 1.0 X-Received: by 10.182.200.169 with SMTP id jt9mr3186013obc.0.1403637065730; Tue, 24 Jun 2014 12:11:05 -0700 (PDT) Received: by 10.202.48.200 with HTTP; Tue, 24 Jun 2014 12:11:05 -0700 (PDT) In-Reply-To: <53A9C31A.8080200@mti-systems.com> References: <53A9C31A.8080200@mti-systems.com> Date: Tue, 24 Jun 2014 12:11:05 -0700 Message-ID: From: Dave Taht To: Wesley Eddy Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/bG_MIDNq4RVqkdpdxi0mm2MIm5A Cc: "aqm@ietf.org" Subject: Re: [aqm] references on global sync & lock-out X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jun 2014 19:11:21 -0000 On Tue, Jun 24, 2014 at 11:27 AM, Wesley Eddy wrote: > Per the discussion in the telecon today about references for global > synchronization and lock-out, I think some excellent classic ones are: > > Global Synchronization: > > Zhang & Clark, "Oscillating Behavior of Network Traffic: A Case Study > Simulation", 1990 > http://groups.csail.mit.edu/ana/Publications/Zhang-DDC-Oscillating-Behavi= or-of-Network-Traffic-1990.pdf I would really like this sort of stuff (and the self similarity paper already cited) revisited with modern traffic. > Floyd & Jacobson, "The Synchronization of Periodic Routing Messages", 199= 4 > http://ee.lbl.gov/papers/sync_94.pdf (thank you for the hyperlinks!) One of my issues with the above paper is that it predates bufferbloat being a prevailing problem on networks and the huge amount of additional bandwidth now available. Routing message size and frequency now is only a problem with BGP, and in virtualized routed environments. The other issue, is that most link technologies today have wildly variable access times to the media itself (notably wireless and wifi), so these naturally act to desynchronize routing updates in the protocols I'm familiar with. Neither of my points have been proved! I've been meaning to rip out desynchronization from babel for wireless interfaces for years now.... > > Lock-Out: > > Floyd & Jacobson, "On Traffic Phase Effects in Packet-Switched > Gateways", 1992 > http://www.icir.org/floyd/papers/phase.pdf *Classic* but also dated. Is there nothing more recent? I will see what I can find on bursty traffic. > > > -- > Wes Eddy > MTI Systems > > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm --=20 Dave T=C3=A4ht NSFW: https://w2.eff.org/Censorship/Internet_censorship_bills/russell_0296_= indecent.article From nobody Tue Jun 24 12:46:04 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4DBEB1A037D for ; Tue, 24 Jun 2014 12:46:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.049 X-Spam-Level: X-Spam-Status: No, score=0.049 tagged_above=-999 required=5 tests=[BAYES_50=0.8, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-0.651, SPF_PASS=-0.001] autolearn=ham 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 2rqnjKQI1yc0 for ; Tue, 24 Jun 2014 12:45:58 -0700 (PDT) Received: from nm50-vm4.bullet.mail.bf1.yahoo.com (nm50-vm4.bullet.mail.bf1.yahoo.com [216.109.115.223]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 439531A0384 for ; Tue, 24 Jun 2014 12:45:58 -0700 (PDT) Received: from [98.139.215.140] by nm50.bullet.mail.bf1.yahoo.com with NNFMP; 24 Jun 2014 19:45:57 -0000 Received: from [98.139.212.228] by tm11.bullet.mail.bf1.yahoo.com with NNFMP; 24 Jun 2014 19:45:57 -0000 Received: from [127.0.0.1] by omp1037.mail.bf1.yahoo.com with NNFMP; 24 Jun 2014 19:45:57 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 311814.6989.bm@omp1037.mail.bf1.yahoo.com Received: (qmail 31612 invoked by uid 60001); 24 Jun 2014 19:45:57 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1403639157; bh=0/DIDXj2rQHATL++cXWmMcOxY776ZgwqZ8yEX0555l4=; h=Message-ID:Date:From:Reply-To:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=a1dVJlp/7MNK5szhEwQpaJc3YHW4OrqpdEHLlawPm7yf3NzmTAVjh3nn/9M1Px7aFbkCevVb2v2Cw0+3xY3MgLhqiuh7nxbjlv4LQKnee96dfVx5CA1fFUU5KOjah7RYkB/C2w0F87RmLN7e4RvxfpSzDeWW/CRuB1FbZjkGypE= X-YMail-OSG: 587LZHwVM1m8IThjxhh176mcj5D6tX7BM4_RsIZoIwh4i_B d2cVOtidMZAM3VmAJ2hGWZOckjCyKUUo3aayjMPbv8KJ2fpG00R30COB1d.i UG312neM.oZsxBpeshJGFGJ0XooTK4yHl2Hqc8wqJI1h3UetgF3oUuX9VdsO RAqJg4STqtnbbBvcJ2x5HV3j_ECfoFPmZ4NgkiBCRocv2tnGlGB1SCaZfvbB WTjPX.TiHoG_kljh7A3A2uFXLsmmRnZOo0WlxC3jBFVOhl5AB4ZcGwlv99Ms .T6XhQnFu7kouyFqzP6lPultVFYIVWvyJOLQcHLHFIreO2PFpSZmSrBVhgza JaH9SiNMDik.ZWJiMdGGASzhGasOfIza_N0xqGPKrvPDfkYwLj.lVOdpf_mx zFDTnqIhhM1pU9.eDTR7k.2W2FHi2ucdpJSau4OR18Xe3BK2o7PkpsMK7bFR 825CSUc6xkqIZZNgIH2t3.og3yPKtKoAn2AtM4AfS.BbMjFMNSVV06MqTst8 V6A6JFbQdI2tEWlm35jvAW9M3b_yJRP7b7fF0XRy83PkM3vvfqw-- Received: from [184.187.166.95] by web141606.mail.bf1.yahoo.com via HTTP; Tue, 24 Jun 2014 12:45:57 PDT X-Rocket-MIMEInfo: 002.001, WXVwLCB0aGlzIGlzIHdoYXQgbXkgZXhwZXJpbWVudHMgYXJlIHNob3dpbmcuICBJJ20gbm90IGRvaW5nIGhlYWQvdGFpbCBkcm9wLCBidXQsIEkgYW0gZHJvcHBpbmcvbWFya2luZyBhdCB0aGUgZGV2aWNlIGJlZm9yZSBhbmQgYWZ0ZXIgdGhlIGJsb2F0ZWQgZGV2aWNlLiAgVGhhdCB3b3VsZCBiZSBjb3VudGVyY2xvY2t3aXNlIG9yIGNsb2Nrd2lzZSBvZiB0aGUgYmxvYXRlZCAoc2xvdyBhbmQgb3ZlcnF1ZXVlZCkgZGV2aWNlLiAgVGhpcyBpcyBlc3NlbnRpYWxseSB0aGUgc2FtZSB0aGluZy4NCg0KV2hhdCABMAEBAQE- X-Mailer: YahooMailClassic/635 YahooMailWebService/0.8.191.1 Message-ID: <1403639157.90844.YahooMailBasic@web141606.mail.bf1.yahoo.com> Date: Tue, 24 Jun 2014 12:45:57 -0700 From: Daniel Havey To: RichardScheffenegger , "Fred Baker \(fred\)" In-Reply-To: <4A20A0BD-1DF4-49AC-856A-B0FD73AADFC1@cisco.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/ft4Cf6tCYhtQV0FVhL9RKvZFL_c Cc: "aqm@ietf.org" , grenville armitage Subject: Re: [aqm] New Version Notification for draft-baker-aqm-sfq-implementation-00.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: dhavey@yahoo.com List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jun 2014 19:46:01 -0000 Yup, this is what my experiments are showing. I'm not doing head/tail drop= , but, I am dropping/marking at the device before and after the bloated dev= ice. That would be counterclockwise or clockwise of the bloated (slow and = overqueued) device. This is essentially the same thing. What I am observing is that if I drop/mark after (clockwise) the system is = snappy and manages the queue quickly. Dropping counterclockwise (before) t= he bloated device is a slightly different story. If I let the flow run for= a few seconds the bloat builds up in the queue at the slow device. Switch= ing AQM on at this point causes "overshoot" and burns the connection. I think what is happening is that it takes so long for the drop signal to p= ropagate that by the time the retransmitted packet arrives it's time to dro= p again so we lose the retransmission and have to wait for an RTO. Whateve= r. Baaaad mojo. Don't let this happen. Anyways, as long as the AQM system is on before the flow starts then the qu= euing is managed and the system remains snappy. So IMHO it really doesn't matter except in the weird corner case where a a = running flow has already bloated the queue and then we switch on the AQM. BTW...On a related note: I tried to address that problem by using ECN. If = I don't drop a packet then there will be no RTX so...Well anyways, I switch= ed on the ECN on my Linux boxes and the thing doesn't work! Is ECN in Linu= x broken? Here are the details: I switched ECN on using the /proc filesystem setting it to request ECN and = to accept ECN requests. However examining the wireshark trace shows that t= he flow is marked Not ECN capable. I'm running 3.12 kernels. I find it difficult to believe that ECN is broken in Linux, but, it's defin= itely not working. Uhhhh, seriously? ECN is broken in Linux? You gotta be= kidding me?!? Did I do something wrong? Anybody else notice this? *** I don't care that much about it because my experiments don't actually r= equire that I use ECN, but, how on earth can we expect people to activate E= CN when it doesn't even work? Errrrggggghhh! -------------------------------------------- On Tue, 6/24/14, Fred Baker (fred) wrote: Subject: Re: [aqm] New Version Notification for draft-baker-aqm-sfq-implem= entation-00.txt To: "Scheffenegger, Richard" Cc: "aqm@ietf.org" , "grenville armitage" Date: Tuesday, June 24, 2014, 12:41 AM =20 =20 On Jun 23, 2014, at 6:32 AM, Scheffenegger, Richard wrote: =20 > >=20 > Hi Fred, >=20 > thank you for writing this down; one aspect that gets referred to, but not made completely explicit in sections 3.2 and 3.3 is the interaction of the AQM / Queue signals with the transport control loop. >=20 > IMHO, it should be made very clear, when the AQM action is done before the queueing, that the AQM signal is delayed for the outer control loop; obviously in a defensive loss situation, this will always be the case. In comparison, when the Queue prepends the AQM action, the AQM signal is delayed less to the outer control loop. >=20 > Depending on the depth of the queue / departure rate, that timing difference can be significant... >=20 > I don't know how to put that into better words that would fit into your draft though. >=20 > Best regards, >=20 > Richard Scheffenegger =20 I can go into that if you want. =20 My logic here goes something like this. =20 You can think of a TCP session as a control loop stuck into the middle of a larger stream. Imagine I=E2=80=99m moving a gigabyte file from here to there, the MSS is 1440 bytes (an IPv6 packet containing it is 1500 bytes), the bottleneck link between =E2=80=9Chere=E2=80=9D and =E2=80=9Cthere=E2=80=9D is some specifi= c rate, and the propagation delay between =E2=80=9Chere=E2=80=9D and =E2=80=9Cther= e=E2=80=9D is some non-trivial value. The least effective window that would maximize throughput is the number of segments that could fully use the bottleneck capacity; any additional quantum that is there sits in a queue and increases the RTT. So at any given point in time, we can think of the transfer as having several components: =20 =C2=A0 =C2=A0=C2=A0=C2=A0K segments that are actually =E2=80=9Cin flight=E2=80=9D somewhere =C2=A0 =C2=A0=C2=A0=C2=A0An additional K segments that hack been received and whose acks are in flight. =C2=A0 =C2=A0=C2=A0=C2=A0cwnd-2*K segments sitting in a queue, probably at the bottleneck. =C2=A0 =C2=A0=C2=A0=C2=A0Some number of bytes that haven=E2=80=99t been transmitted yet =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 of those, the next cwnd segments will be transmitted as acks arrive. =C2=A0 =C2=A0=C2=A0=C2=A0Some number of bytes that have already been received at the far end but not delivered yet to the application =C2=A0 =C2=A0=C2=A0=C2=A0Zero or more segments that have been received out of order and are being held pending retransmission =20 Now, let=E2=80=99s mark a specific segment; I=E2=80=99ll call it segment N. I don=E2=80=99t really care what the value of N is. But it is the segment that the AQM algorithm will select and drop, by whatever algorithm it decides. In a tail-drop case, for the sake of argument, we can assert that the entire cwnd segments are between segment N and the receiver or are represented in acknowledgments on their way back. In a head-drop case, there are cwnd-2K segments sitting in the queue after segment N, K segments between it and the receiver, and K acks in flight. =20 =C2=A0 +------+=C2=A0 =C2=A0 =C2=A0 +--------+=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +--------+ =C2=A0 |=C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 | Queue=C2=A0 |Data=C2=A0 =C2=A0 K segments=C2=A0 =C2=A0 |= =C2=A0 =C2=A0 =C2=A0 =C2=A0 | =C2=A0 |=C2=A0 =C2=A0 =C2=A0 +----->+=C2=A0 =C2=A0 =C2=A0 =C2=A0 +----> - - - - ------->+=C2=A0 =C2=A0 =C2=A0 =C2=A0 | =C2=A0 |Sender|=C2=A0 =C2=A0 =C2=A0 |Router 1|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |Receiver| =C2=A0 |=C2=A0 =C2=A0 =C2=A0 +<-----+=C2=A0 =C2=A0 =C2=A0 =C2=A0 +<---- - - - - <-------+=C2=A0 =C2=A0 =C2=A0 =C2=A0 | =C2=A0 |=C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 = =C2=A0 |Acks=C2=A0 =C2=A0 K acks=C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 | =C2=A0 +------+=C2=A0 =C2=A0 =C2=A0 +--------+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +--------+ =20 So now, the whole thing rotates clockwise.=20 1) K segments already in flight arrive and are acknowledged while K acks arrive at the sender and trigger new transmissions. The queue still has cwnd-2*K segments in it. 2) depending on whether it was head drop or tail drop, somewhere between zero and cwnd-2*K segments arrive and are acknowledged while as many acks are received at the sender and trigger new transmissions. The queue still has cwnd-2*K segments in it. 3) the missed packet is detected by the receiver, who starts responding with duplicate acks. However, there are still K acks in flight, so the sender is going to send another K new packets before he even sees the first dupack. The queue still has cwnd-2*K segments in it. 4) we now get a long stream of dupacks, and the sender presumably retransmits the dropped packet. AT THIS POINT, SENDER REDUCES CWND. If more than one packet got dropped, let=E2=80=99s hope the SACK logic retransmits it as well. 5) At long last, the retransmission arrives at the receiver, who sends a giant ack and starts sending a stream of acks, triggering new transmissions. =20 To determine the difference between head-drop and tail-drop, we have to ask ourselves how big cwnd-2*K is. If we are using traditional too-full-drop-something without AQM, it might be a largish number (it could be the size of the memory allocated to the queue if there is no competing traffic), and it is probably fair to say that head-drop would get the event back to the sender more rapidly than tail-drop. =20 If we are using any AQM technology - RED, WRED, ARED, PIE, CoDel, Blue, AVQ, or whatever else, the fundamental purpose of the logic is to keep the queue relatively shallow, even if it ha a large memory system behind it. In RED terms, we would estimate that the mean queue depth will approximate min-threshold or less; each of the other technologies has its counterpart to that and will similarly keep the latency and/or queue depth down. =20 Hence, cwnd-2*K is a function of the mean queue depth at the bottleneck, and is a relatively small number. Hence, if we=E2=80=99re using an AQM algorithm - any AQM algorithm as long as it works - the real differences between had-drop and tail-drop is a relatively small number. =20 Which makes me ask - what are we really talking about? Does it actually matter? -----Inline Attachment Follows----- =20 _______________________________________________ aqm mailing list aqm@ietf.org https://www.ietf.org/mailman/listinfo/aqm From nobody Tue Jun 24 13:01:11 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6AA761A0641 for ; Tue, 24 Jun 2014 13:01:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -115.152 X-Spam-Level: X-Spam-Status: No, score=-115.152 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_HI=-5, RP_MATCHES_RCVD=-0.651, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_WHITELIST=-100] autolearn=ham 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 VWPUwJ0t3xHn for ; Tue, 24 Jun 2014 13:01:03 -0700 (PDT) Received: from alln-iport-8.cisco.com (alln-iport-8.cisco.com [173.37.142.95]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E0F091A0417 for ; Tue, 24 Jun 2014 13:01:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1560; q=dns/txt; s=iport; t=1403640065; x=1404849665; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=We9lEGKCUzAPmAjpmBTIBTGb6ax/eO+R6fsN3xTeivs=; b=WHBArdWwsVlraJjXEfSC1YUNzRHz8bX3a0HGfSjJH/PIaiNxCBMvXqrj V5eisKRgj/zV/30NH/K1I6JiFy+wxa3OTiU2Mv0/fCDES7NiB8Whxe36o tw6Tyr0FEOz2Pe7vBbUuQ1RJ/4RPXqqcYaME02bR8N+q+UUIFMMeP9H7t I=; X-Files: signature.asc : 195 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AicFAIjYqVOtJV2d/2dsb2JhbABagw2BLK0jll0BgQ0WdYQDAQEBAwF3AgULAgEIRjITEgIEDgUOiCADCQjJRheMV4IlB4MtgRYBBIRjBY0ggUGFEYF3jWGGCoIAgUKCMA X-IronPort-AV: E=Sophos;i="5.01,539,1400025600"; d="asc'?scan'208";a="55642562" Received: from rcdn-core-6.cisco.com ([173.37.93.157]) by alln-iport-8.cisco.com with ESMTP; 24 Jun 2014 20:01:04 +0000 Received: from xhc-rcd-x10.cisco.com (xhc-rcd-x10.cisco.com [173.37.183.84]) by rcdn-core-6.cisco.com (8.14.5/8.14.5) with ESMTP id s5OK12QO014126 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Tue, 24 Jun 2014 20:01:02 GMT Received: from xmb-rcd-x09.cisco.com ([169.254.9.143]) by xhc-rcd-x10.cisco.com ([173.37.183.84]) with mapi id 14.03.0123.003; Tue, 24 Jun 2014 15:01:01 -0500 From: "Fred Baker (fred)" To: "dhavey@yahoo.com" Thread-Topic: [aqm] New Version Notification for draft-baker-aqm-sfq-implementation-00.txt Thread-Index: AQHPj+cFbzbzbfyYwUGMpqf8z0Cyxw== Date: Tue, 24 Jun 2014 20:01:01 +0000 Message-ID: References: <1403639157.90844.YahooMailBasic@web141606.mail.bf1.yahoo.com> In-Reply-To: <1403639157.90844.YahooMailBasic@web141606.mail.bf1.yahoo.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.19.64.121] Content-Type: multipart/signed; boundary="Apple-Mail=_F0CB2B31-3A11-40AE-8441-60738A870909"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/jgld3jgyFpAepXcw9bVs4RmWt08 Cc: RichardScheffenegger , "aqm@ietf.org" , grenville armitage Subject: Re: [aqm] New Version Notification for draft-baker-aqm-sfq-implementation-00.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jun 2014 20:01:07 -0000 --Apple-Mail=_F0CB2B31-3A11-40AE-8441-60738A870909 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 On Jun 24, 2014, at 12:45 PM, Daniel Havey wrote: > So IMHO it really doesn't matter except in the weird corner case where = a a running flow has already bloated the queue and then we switch on the = AQM. That actually has me a little worried with the 100 ms delay built into = codel. Imagine, if you will, that you have a deep buffer at the = bottleneck and a relatively short RTT, and are moving a large file. I = could imagine codel=92s delay allowing a session to build a large = backlog and then =93suddenly turning on AQM=94. on a 10 MS link with = O(200) packets queue depth, for example, you could build 100 ms plus of = data in the queue, spend the delay mostly emptying it, and then drop the = last queued packet because 100 ms had gone by, there was still data in = the queue, and the next packet had sat there longer than 5 ms. --Apple-Mail=_F0CB2B31-3A11-40AE-8441-60738A870909 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iD8DBQFTqdj7bjEdbHIsm0MRAg+5AJ4uUMA3QyMpQqDAgAN9pzg+A9afwACg5sRF vOHZk47h0ReWtvkhavpZ2ME= =UOAZ -----END PGP SIGNATURE----- --Apple-Mail=_F0CB2B31-3A11-40AE-8441-60738A870909-- From nobody Tue Jun 24 13:33:50 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4A2C51B283A for ; Tue, 24 Jun 2014 13:33:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.251 X-Spam-Level: X-Spam-Status: No, score=-1.251 tagged_above=-999 required=5 tests=[BAYES_05=-0.5, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-0.651, SPF_PASS=-0.001] autolearn=ham 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 aQZJ--Sm9tVK for ; Tue, 24 Jun 2014 13:33:37 -0700 (PDT) Received: from nm3-vm0.bullet.mail.bf1.yahoo.com (nm3-vm0.bullet.mail.bf1.yahoo.com [98.139.212.154]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 645131B2844 for ; Tue, 24 Jun 2014 13:33:36 -0700 (PDT) Received: from [98.139.214.32] by nm3.bullet.mail.bf1.yahoo.com with NNFMP; 24 Jun 2014 20:33:35 -0000 Received: from [98.139.212.228] by tm15.bullet.mail.bf1.yahoo.com with NNFMP; 24 Jun 2014 20:33:35 -0000 Received: from [127.0.0.1] by omp1037.mail.bf1.yahoo.com with NNFMP; 24 Jun 2014 20:33:35 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 423292.41690.bm@omp1037.mail.bf1.yahoo.com Received: (qmail 86858 invoked by uid 60001); 24 Jun 2014 20:33:35 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1403642015; bh=4Td2215f5m9oAyGGrHJDks0ztWQPeGuVzhBEaWW33Ow=; h=Message-ID:Date:From:Reply-To:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=XT1N3EGHmptp1iBANrIFCO+iBLlrfIbfkOhzgnQDKE5xJV2abAX1MwXm+EjkfAYkpaOuXUnykZ9ER9JGKRI8LBa8ft4S2mvCX4/Ac/PckSmFCUfYPUNGVD4LcHOWQjdsW90MfK/ZckJOSZBCAzcs7Wi2CzKD5pWlF3giChsHVbk= X-YMail-OSG: j4_BfckVM1lP_yU0AfnHQ6.zboDlRMvzSBJSJK1cw9X2LnO Q9VtgeB_mvX3U7p01amMnj9mu5f34B5MyRK9Ke_Q5au8Sh0emEy4tFBFJHp6 oWkcRgKrHYGmRgUBsKHQkMLiCY8gIiNQ6df4H1Z_TMBxqkgwFj9n7cpKpFoL Tirilk8FjZbs2Xcp9Lxhii3fqA4JSXsO12BUBGSoWuNytuvgxlFy9uq6zzzd sP3K2kDS6K4S5l9XsjDgUY7nUloEwMp3gTSP0R7Yd06Es3V._9yxgj6K7PUO 1dRPxhBnDiQpusZypQj5Wb.IxQ1B1qPYIrI.i7Mn5E9xXnmt7jLcs6Tx2O9N qXFpOQL22s5wXUWmtw3ZLxwcCc3LPAq9gtarrU68ZU1midGzBtT1pqezGxNl l8A.Q8NfVx4SbgtE5o5hlxona3_50WWxDGI47AdnTVOi35l1wIlSHyIWDtOC sm60rOOFi.VcDuGpTLTHxNi3L7Chz6ZrXXcnuOGUm6jA3.TfGkMUASRTnvRV uN1Hr2dUu8.2dnfXuoPu_eg8bBNBLtYv9cVmcaThFSWChm3wD1g-- Received: from [184.187.166.95] by web141605.mail.bf1.yahoo.com via HTTP; Tue, 24 Jun 2014 13:33:35 PDT X-Rocket-MIMEInfo: 002.001, U28gZmFyIGluIG15IG9ic2VydmF0aW9ucyAoYWRtaXR0ZWRseSBhIHZlcnkgc21hbGwgc2FtcGxlIHNpemUpIGl0J3MgbW9yZSBvZiBhbiBhbm5veWFuY2UgdGhhbiBhIHByb2JsZW0uICBXZSBnZXQgYW4gdW53YW50ZWQgY29uZ2VzdGlvbiBldmVudCBhbmQgbG9zZSBhIGxpdHRsZSBiYW5kd2lkdGgsIGJ1dCwgYWZ0ZXIgdGhhdCB0aGUgcXVldWUgaXMgZHJhaW5lZCBhbmQgY2FuIGJlZ2luIGJ1aWxkaW5nIHVwIGFnYWluLg0KDQpCdXQgeWVhaCwgSSBzZWUgeW91ciBjb25jZXJuLiAgVGhlcmUgbWF5IGJlIHMBMAEBAQE- X-Mailer: YahooMailClassic/635 YahooMailWebService/0.8.191.1 Message-ID: <1403642015.64160.YahooMailBasic@web141605.mail.bf1.yahoo.com> Date: Tue, 24 Jun 2014 13:33:35 -0700 From: Daniel Havey To: "Fred Baker \(fred\)" In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/Y_QqHUvdzaT49GOx9DWV6-rQh14 Cc: RichardScheffenegger , "aqm@ietf.org" , grenville armitage Subject: Re: [aqm] New Version Notification for draft-baker-aqm-sfq-implementation-00.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: dhavey@yahoo.com List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jun 2014 20:33:41 -0000 So far in my observations (admittedly a very small sample size) it's more o= f an annoyance than a problem. We get an unwanted congestion event and los= e a little bandwidth, but, after that the queue is drained and can begin bu= ilding up again. But yeah, I see your concern. There may be scenarios where the interaction= of the interval, the RTT and the bandwidth cause this to happen recurringl= y constantly underflowing the bandwidth. ...Daniel -------------------------------------------- On Tue, 6/24/14, Fred Baker (fred) wrote: Subject: Re: [aqm] New Version Notification for draft-baker-aqm-sfq-implem= entation-00.txt To: "dhavey@yahoo.com" Cc: "RichardScheffenegger" , "aqm@ietf.org" ,= "grenville armitage" Date: Tuesday, June 24, 2014, 1:01 PM =20 =20 On Jun 24, 2014, at 12:45 PM, Daniel Havey wrote: =20 > So IMHO it really doesn't matter except in the weird corner case where a a running flow has already bloated the queue and then we switch on the AQM. =20 That actually has me a little worried with the 100 ms delay built into codel. Imagine, if you will, that you have a deep buffer at the bottleneck and a relatively short RTT, and are moving a large file. I could imagine codel=E2=80=99s delay allowing a session to build a large backlog and then =E2=80=9Csuddenly turning on AQM=E2=80=9D. on a 10 MS link with O(200) packets queue depth, for example, you could build 100 ms plus of data in the queue, spend the delay mostly emptying it, and then drop the last queued packet because 100 ms had gone by, there was still data in the queue, and the next packet had sat there longer than 5 ms. From nobody Tue Jun 24 13:44:36 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 518B61B2883 for ; Tue, 24 Jun 2014 13:44:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.101 X-Spam-Level: X-Spam-Status: No, score=-0.101 tagged_above=-999 required=5 tests=[BAYES_20=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-0.001] autolearn=ham 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 p6Si1QYta0Wg for ; Tue, 24 Jun 2014 13:44:30 -0700 (PDT) Received: from mail-oa0-x22b.google.com (mail-oa0-x22b.google.com [IPv6:2607:f8b0:4003:c02::22b]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2DD7E1B287F for ; Tue, 24 Jun 2014 13:44:30 -0700 (PDT) Received: by mail-oa0-f43.google.com with SMTP id o6so1011487oag.30 for ; Tue, 24 Jun 2014 13:44:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=D8cSQ1fHxWORoUz3/YMRM5ux98It+7WHwyMtuoI6Rxc=; b=dBZEHFOL/Gq+8SqgZQcNeaw3c9aiO7r4pf6nFGellhsAV9YVPhS5OGVMkymm9+m+FD IIYFC9uA22YoBEqqurAWouDEoQtFwalcZzNGtOkQ/YQ7zg2HYFmMaLD06s0OKpqfG3oS WNMQAuLTT755p4hlAphnxdLw8iBNBsrIi0RI/krY7GVbC3wbDpJ5/60ODrgwzipJSAFf fL87V1O+ej8WgTjMp2QJjqToxtc454lLPNUAiQ1LOQt8PoTKNsg7aoNlZaaG2wlVW3/W MoaC3NjaqVdz69zlupYCZ5H7EvBM7vGy3r5Y0gy3+dFp069P/FEBagsoJy6x0KtzuuRt dycw== MIME-Version: 1.0 X-Received: by 10.182.95.68 with SMTP id di4mr3409893obb.87.1403642669562; Tue, 24 Jun 2014 13:44:29 -0700 (PDT) Received: by 10.202.48.200 with HTTP; Tue, 24 Jun 2014 13:44:29 -0700 (PDT) In-Reply-To: References: <1403639157.90844.YahooMailBasic@web141606.mail.bf1.yahoo.com> Date: Tue, 24 Jun 2014 13:44:29 -0700 Message-ID: From: Dave Taht To: "Fred Baker (fred)" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/KkvvK9iQv9_FwzD8590RlUOl-5c Cc: RichardScheffenegger , "aqm@ietf.org" , "dhavey@yahoo.com" , grenville armitage Subject: Re: [aqm] New Version Notification for draft-baker-aqm-sfq-implementation-00.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jun 2014 20:44:32 -0000 On Tue, Jun 24, 2014 at 1:01 PM, Fred Baker (fred) wrote: > > On Jun 24, 2014, at 12:45 PM, Daniel Havey wrote: > >> So IMHO it really doesn't matter except in the weird corner case where a= a running flow has already bloated the queue and then we switch on the AQM= . Hmm? In practice, changing the qdisc in Linux, at least, does completely blow up the existing queue: all packets are discarded, the various data structures removed, the new data structures created, then switched. Don't do that. Do it once, at init time, or before address acquisition. Simple schemes can be handled now (linux 3.13 and later) by a single sysctl variable, set either in /etc/sysctl.conf or via sysctl -w net.core.default_qdisc=3Dfq_codel # or pie, or sfq, or fq Arguably this needs to allow for arguments, be more flexible and interface specific. Same goes for enabling ecn or not. (net.ipv4.tcp_ecn=3D0) More complex implementations, like htb, have a "default" direction things go until things are fully setup. Other linux implementations, like drr and qfq, do not, and result in packet loss until entirely setup. Recently support for a "plug scheduler" was developed in order to assist vm migration, which might make it more possible to switch out qdiscs without interrupting service. > That actually has me a little worried with the 100 ms delay built into co= del. "Initial delay" until it finds a sane delay to drop at. >Imagine, if you will, that you have a deep buffer at the bottleneck and a = relatively short RTT, and are moving a large file. I could imagine codel=E2= =80=99s delay allowing a session to build a large backlog and then =E2=80= =9Csuddenly turning on AQM=E2=80=9D. on a 10 MS link with O(200) packets qu= eue depth, for example, you could build 100 ms plus of data in the queue, s= pend the delay mostly emptying it, and then drop the last queued packet bec= ause 100 ms had gone by, there was still data in the queue, and the next pa= cket had sat there longer than 5 ms. Given that pie depends on an estimation window being filled this is not a problem pie has. However needing that window filled is a big problem at low bandwidths for pie. As for codel.... Well there is a specific inhibit in present forms of codel to not drop the last packet in the queue even if it has sat there too long. Codel stops dropping at minbytes (called maxpacket in the code), which is a variable determined from the flow characteristics, and is usually 1MTU in size, but can be larger if TSO or GRO are in operation on the device. The first versions of fq_codel preserved this behavior: it would never drop the last packet in any fq_codel queue. This (still) seems like desirable behavior in the case of having nearly one queue per flow, but it led inevitably to what I had called the horizontal standing queue problem (where we could end up with 1024 queues all with one packet and no longer meeting the latency target(s)). So eric made the backlog maxpacket check global to all queues, and that's what's been deployed ever since. Later work, (I think) is showing, that in practice any inhibit at all hurts on the architectures available, as htb or (bql and the tx-ring) are already buffering up packets below where codel was dropping from near-head. More packets will always be along, later. This patch disables the maxpacket check entirely, and results in a space and cpu savings, without much observable negative or positive effect on latency and utilization on the bandwidths available to me. I remain a bit concerned about what happens with TSO and/or GRO enabled. http://snapon.lab.bufferbloat.net/~cero2/0003-codel-eliminate-maxpacket-var= iable.patch I'd love it if people tried it. Of higher concern to me has long been more sanely applying hysteresis in the drop rate over wildly varying high bandwidths and loads, but not a lot of work has gone into codel since it's inception, as it was so good to start with and so dramatically improved by fq_codel as to be barely worth debating. But certainly better control laws are welcomed! > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm > --=20 Dave T=C3=A4ht NSFW: https://w2.eff.org/Censorship/Internet_censorship_bills/russell_0296_= indecent.article From nobody Tue Jun 24 13:48:54 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 746DD1B2830 for ; Tue, 24 Jun 2014 13:48:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -115.152 X-Spam-Level: X-Spam-Status: No, score=-115.152 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_HI=-5, RP_MATCHES_RCVD=-0.651, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_WHITELIST=-100] autolearn=ham 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 UpxHkhL76FzW for ; Tue, 24 Jun 2014 13:48:50 -0700 (PDT) Received: from alln-iport-1.cisco.com (alln-iport-1.cisco.com [173.37.142.88]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A6EA61B27CA for ; Tue, 24 Jun 2014 13:48:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2121; q=dns/txt; s=iport; t=1403642929; x=1404852529; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=G/WQDnO0mpu7xMOHOuAJyDwz3d8Kq6RDN+dliLhJaBA=; b=bJS1svIeJziKvQkg27HLVt3O9rV1iJfiM+3LyyRM0j+wYbfnw5s+Tu4c hrqOiL6o1wipHXizMmNPiUAcLddKNgpJgPocl5vLLnpjeDReLbDjbwZqT 0PtS5/UG33AUuwM9RJonXh4wUE56t7gzKtqu7WQ/6U53MVG6i7aP22WPE M=; X-Files: signature.asc : 195 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AicFACbjqVOtJA2K/2dsb2JhbABagw2BLK0jll0BgQ0WdYQDAQEBAwF3AgULAgEIRjITEgIEDgUOiCADCQjIYReMV4IlB4MtgRYBBIRjBY0ggUGFEYF3jWGGCoIAgUKCMA X-IronPort-AV: E=Sophos;i="5.01,540,1400025600"; d="asc'?scan'208";a="55596238" Received: from alln-core-5.cisco.com ([173.36.13.138]) by alln-iport-1.cisco.com with ESMTP; 24 Jun 2014 20:48:48 +0000 Received: from xhc-aln-x08.cisco.com (xhc-aln-x08.cisco.com [173.36.12.82]) by alln-core-5.cisco.com (8.14.5/8.14.5) with ESMTP id s5OKmmIS003419 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Tue, 24 Jun 2014 20:48:48 GMT Received: from xmb-rcd-x09.cisco.com ([169.254.9.143]) by xhc-aln-x08.cisco.com ([173.36.12.82]) with mapi id 14.03.0123.003; Tue, 24 Jun 2014 15:48:48 -0500 From: "Fred Baker (fred)" To: "dhavey@yahoo.com" Thread-Topic: [aqm] New Version Notification for draft-baker-aqm-sfq-implementation-00.txt Thread-Index: AQHPj+2yGVQFDlxc2UKyZ6kcY+kDrA== Date: Tue, 24 Jun 2014 20:48:48 +0000 Message-ID: <39F7A6EA-5C05-47FD-A0DC-C8925D034EBA@cisco.com> References: <1403642015.64160.YahooMailBasic@web141605.mail.bf1.yahoo.com> In-Reply-To: <1403642015.64160.YahooMailBasic@web141605.mail.bf1.yahoo.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.19.64.121] Content-Type: multipart/signed; boundary="Apple-Mail=_9E418123-797E-4916-ACA2-9742F2F22F67"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/Gk8wLLtZp0ruta47eaFDSgocywQ Cc: RichardScheffenegger , "aqm@ietf.org" , grenville armitage Subject: Re: [aqm] New Version Notification for draft-baker-aqm-sfq-implementation-00.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jun 2014 20:48:52 -0000 --Apple-Mail=_9E418123-797E-4916-ACA2-9742F2F22F67 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 On Jun 24, 2014, at 1:33 PM, Daniel Havey wrote: > There may be scenarios where the interaction of the interval, the RTT = and the bandwidth cause this to happen recurringly constantly = underflowing the bandwidth. To be honest, the real concern is very long delay paths, and it applies = to AQM algorithms generally. During TCP slow start (which is not = particularly slow, but entertains contains exponential growth), we have = an initial burst, which with TCP Offload Engines can, I=92m told, spit = 65K bytes out in the initial burst. The burst travels somewhere and = results in a set of acks, which presumably arrive at the sender at = approximately the rate the burst went through the bottleneck, but elicit = a burst roughly twice as fast as the bottleneck. That happens again and = again until either a loss/mark event is detected or cwnd hits ssthresh, = at which point the growth of cwnd becomes linear. If the burst is allowed to use the entire memory of the bottleneck = system=92s interface, it will very possibly approach the capacity of the = bottleneck. However, with pretty much any AQM algorithm I=92m aware of, = the algorithm will sense an issue and drop or mark something, kicking = the session into congestion avoidance relatively early. This is well-known behavior, and something we have a couple of RFCs on. But yes, it can happen on more nominal paths as well. --Apple-Mail=_9E418123-797E-4916-ACA2-9742F2F22F67 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iD8DBQFTqeQvbjEdbHIsm0MRAiaiAKCECnaYVT0Or5isgFwzDNjHRIju+ACg2cpW 5hRH/HxZCsxi1tUpmY1NGOU= =AzTp -----END PGP SIGNATURE----- --Apple-Mail=_9E418123-797E-4916-ACA2-9742F2F22F67-- From nobody Tue Jun 24 16:06:07 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C27571B2952 for ; Tue, 24 Jun 2014 16:06:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-0.001] autolearn=ham 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 dgx5JB3tkVWQ for ; Tue, 24 Jun 2014 16:06:02 -0700 (PDT) Received: from mail-oa0-x236.google.com (mail-oa0-x236.google.com [IPv6:2607:f8b0:4003:c02::236]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 63D821B2988 for ; Tue, 24 Jun 2014 16:06:02 -0700 (PDT) Received: by mail-oa0-f54.google.com with SMTP id eb12so1178628oac.13 for ; Tue, 24 Jun 2014 16:06:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=1vdelg7qxEMq41VIVcJKigjspXxCJrz5mIdJB8d6pIQ=; b=PJm8WAKF3/OPkdY/o5Q5QhtIKw1rIPOU7QyBSctUrWjvtXTP9ccQ5y8hG28kl4d/Ov W8I5VQhHJpVgTNmZEUcF2yFa6SZwrCg6IV/ON3uDnPU9DX+zePiqB7+/W3KPW8aockbb w0z6URz8FrgkVFV+VwSYilLPn57LjVxJsZWnN/bvKixIkex+aon1jr9urZjhSSQYNc/m RuJz38yb6Nf8Zod9cGaMVvdXxhqJTt2E+X3c6UvF6kmtA03xLIypfpzgzSt1X2plaMHN 0T9gfwYrckFGJjPHtudhghLxvtNNWMUb8AyVEtYw3H6CuBFHIWdLrhxge62LJPNc20Lf CpVg== MIME-Version: 1.0 X-Received: by 10.182.95.68 with SMTP id di4mr4075491obb.87.1403651161718; Tue, 24 Jun 2014 16:06:01 -0700 (PDT) Received: by 10.202.48.200 with HTTP; Tue, 24 Jun 2014 16:06:01 -0700 (PDT) In-Reply-To: <39F7A6EA-5C05-47FD-A0DC-C8925D034EBA@cisco.com> References: <1403642015.64160.YahooMailBasic@web141605.mail.bf1.yahoo.com> <39F7A6EA-5C05-47FD-A0DC-C8925D034EBA@cisco.com> Date: Tue, 24 Jun 2014 16:06:01 -0700 Message-ID: From: Dave Taht To: "Fred Baker (fred)" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/SSfpemthfFXHXSN3Lme9lBWN_hU Cc: RichardScheffenegger , "aqm@ietf.org" , "dhavey@yahoo.com" , grenville armitage Subject: Re: [aqm] New Version Notification for draft-baker-aqm-sfq-implementation-00.txt X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jun 2014 23:06:05 -0000 On Tue, Jun 24, 2014 at 1:48 PM, Fred Baker (fred) wrote: > > On Jun 24, 2014, at 1:33 PM, Daniel Havey wrote: > >> There may be scenarios where the interaction of the interval, the RTT an= d the bandwidth cause this to happen recurringly constantly underflowing th= e bandwidth. > > To be honest, the real concern is very long delay paths, and it applies t= o AQM algorithms generally. During TCP slow start (which is not particularl= y slow, but entertains contains exponential growth), we have an initial bur= st, which with TCP Offload Engines can, I=E2=80=99m told, spit 65K bytes ou= t in the initial burst. The burst travels somewhere and results in a set of= acks, which presumably arrive at the sender at approximately the rate the = burst went through the bottleneck, but elicit a burst roughly twice as fast= as the bottleneck. That happens again and again until either a loss/mark e= vent is detected or cwnd hits ssthresh, at which point the growth of cwnd b= ecomes linear. I think tcp offloads have been thoroughly shown by now to blow up all sorts of networks, and there has been a lot of work in recent linux kernels for hosts to mitigate it (use smaller bursts), most recently the sch_fq + pacing work. The objective of slow start is to "fill the pipe" and especially in the case of long rtts like in satellite and lte networks, it needs to be, well, slower. tcp offloads are an assist to slower cpus and a per-ethernet-device "feature" to get more "bandwidth" for less cpu... at the cost of latency, bursty loss, and packet mixing. modern x86 hardware can easily saturate gigE links without TSO in use at all. many lower end (arm) products can't, as yet, and 10GigE is still the realm of TSO (with mitigations arriving in software as per above) I do hope things like TSO2 (bursts of 256k packets) are not widely adopted, and smarter mixing happens on multi-queued ethernet devices instead. > If the burst is allowed to use the entire memory of the bottleneck system= =E2=80=99s interface, it will very possibly approach the capacity of the bo= ttleneck. However, with pretty much any AQM algorithm I=E2=80=99m aware of,= the algorithm will sense an issue and drop or mark something, kicking the = session into congestion avoidance relatively early. big bursts are bad. let packets be packets! Kicking things into congestion avoidance early turns out to have interesting interactions with hystart. > > This is well-known behavior, and something we have a couple of RFCs on. > > But yes, it can happen on more nominal paths as well. > > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm > --=20 Dave T=C3=A4ht NSFW: https://w2.eff.org/Censorship/Internet_censorship_bills/russell_0296_= indecent.article From nobody Wed Jun 25 00:57:31 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8956D1A00D8 for ; Wed, 25 Jun 2014 00:57:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.029 X-Spam-Level: X-Spam-Status: No, score=-2.029 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RP_MATCHES_RCVD=-0.651, SPF_PASS=-0.001] autolearn=ham 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 3eqPBEOTy_oq for ; Wed, 25 Jun 2014 00:57:28 -0700 (PDT) Received: from mail-qa0-x232.google.com (mail-qa0-x232.google.com [IPv6:2607:f8b0:400d:c00::232]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9AD401B2851 for ; Wed, 25 Jun 2014 00:57:27 -0700 (PDT) Received: by mail-qa0-f50.google.com with SMTP id m5so1213338qaj.37 for ; Wed, 25 Jun 2014 00:57:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=qpBzEEMTk3FcddtTlSdaQs3+HDMKf6mRJYnKSbJuijY=; b=DqG90cbTsjwsGuSvnVOjQEieHsihz//YUyxSOxDmfoBCC8A8ieDR12qMUHGfIG6orH 7cZbjh/2A0epIP6DFOmtok3oQEI8CKtdpKioSFwxpGGzIYykDqRGhrl6m2YlvKUNKBnB 6TDD3ugxYA9ubLzF1AyyAK402gq1LwhE+47Hl24cIs5tlpFPVeEtpKhHG7DjMQoatHRt 3eSROXyHhjjwdX8AErKCBkmxh7vmAq7gpEvf1ibf5JCq8JJXOFpS6H3sm4duBJORNgDH GtDqbVMXzegoo06Gf41XiZqCIGyUZcX17dXJulEDsUg3uF2yUIhY6R/jDZy8NBT1J+/q Qs/Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=qpBzEEMTk3FcddtTlSdaQs3+HDMKf6mRJYnKSbJuijY=; b=P21PZ2fuQDdoUrIe/UtAGebnRey9TL0L7gdIF97jLmNCL6/2G/1+f5axO7WoxYZZ+K 5W6jI5fRxEdS9g+XpxqKUcvpp++7Gkbov0ID40Q3C2DWQB/oAIm+430T706R2vgyJjzY RB6xbWjUm8DDrN3TnR8PVpojFkmTel7Ddp4gfMgkhBzJ55D6mx4u03RdHQDpyzX3iOWc CDBlFeUGMp+W4JSXH/F1v6ZNkMqSQpEROpCBINYDUeHp9gUhB9S56snW87eCi5tnHIFC UMo06POiIzb4OizAGaGg8VFcogXWzhH0jNTRW52Kc5jvzjCuahwDcFgSV/ZKOxEqNiK2 0eTw== X-Gm-Message-State: ALoCoQlcW9N4Md9P8YdIXJp2y5ajUY4CjHTa/cY54QUi7eFLjI8PgCydrJLEjOqK5lTiXBSjMJ5x MIME-Version: 1.0 X-Received: by 10.224.131.74 with SMTP id w10mr9266669qas.100.1403683046794; Wed, 25 Jun 2014 00:57:26 -0700 (PDT) Received: by 10.224.104.205 with HTTP; Wed, 25 Jun 2014 00:57:26 -0700 (PDT) In-Reply-To: References: <53A9C31A.8080200@mti-systems.com> Date: Wed, 25 Jun 2014 17:57:26 +1000 Message-ID: From: Andrew Mcgregor To: Dave Taht Content-Type: multipart/alternative; boundary=001a11c2957261d07804fca46d89 Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/aOUUIWQDUioVrcH6KZD9njVCiRc Cc: Wesley Eddy , "aqm@ietf.org" Subject: Re: [aqm] references on global sync & lock-out X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Jun 2014 07:57:30 -0000 --001a11c2957261d07804fca46d89 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable One useful reference on bursty traffic is: Stefan Bodamer & Joachim Charzinski "Evaluation of Effective Bandwidth Schemes for Self-Similar Traffic", 2000 http://www.ikr.uni-stuttgart.de/Content/Publications/Archive/Bo_IP00_32462.= pdf On 25 June 2014 05:11, Dave Taht wrote: > On Tue, Jun 24, 2014 at 11:27 AM, Wesley Eddy wrote= : > > Per the discussion in the telecon today about references for global > > synchronization and lock-out, I think some excellent classic ones are: > > > > Global Synchronization: > > > > Zhang & Clark, "Oscillating Behavior of Network Traffic: A Case Study > > Simulation", 1990 > > > http://groups.csail.mit.edu/ana/Publications/Zhang-DDC-Oscillating-Behavi= or-of-Network-Traffic-1990.pdf > > I would really like this sort of stuff (and the self similarity paper > already cited) revisited with modern traffic. > > > Floyd & Jacobson, "The Synchronization of Periodic Routing Messages", > 1994 > > http://ee.lbl.gov/papers/sync_94.pdf > > (thank you for the hyperlinks!) > > One of my issues with the above paper is that it predates bufferbloat > being a prevailing problem on networks and the huge amount of > additional bandwidth now available. Routing message size and frequency > now is only a problem with BGP, and in virtualized routed > environments. > > The other issue, is that most link technologies today have wildly > variable access times to the media itself (notably wireless and wifi), > so these naturally act to desynchronize routing updates in the > protocols I'm familiar with. > > Neither of my points have been proved! I've been meaning to rip out > desynchronization from babel for wireless interfaces for years now.... > > > > > > Lock-Out: > > > > Floyd & Jacobson, "On Traffic Phase Effects in Packet-Switched > > Gateways", 1992 > > http://www.icir.org/floyd/papers/phase.pdf > > *Classic* but also dated. Is there nothing more recent? > > I will see what I can find on bursty traffic. > > > > > > > -- > > Wes Eddy > > MTI Systems > > > > _______________________________________________ > > aqm mailing list > > aqm@ietf.org > > https://www.ietf.org/mailman/listinfo/aqm > > > > -- > Dave T=C3=A4ht > > NSFW: > https://w2.eff.org/Censorship/Internet_censorship_bills/russell_0296_inde= cent.article > > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm > --=20 Andrew McGregor | SRE | andrewmcgr@google.com | +61 4 1071 2221 --001a11c2957261d07804fca46d89 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
One useful reference on bursty traffic is:
Stefan= Bodamer & Joachim Charzinski "Evaluation of Effective Bandwidth S= chemes for Self-Similar Traffic", 2000


O= n 25 June 2014 05:11, Dave Taht <dave.taht@gmail.com> wrot= e:
On Tue, Jun 24, 2014 at 11:2= 7 AM, Wesley Eddy <wes@mti-system= s.com> wrote:
> Per the discussion in the telecon today about references for global > synchronization and lock-out, I think some excellent classic ones are:=
>
> Global Synchronization:
>
> Zhang & Clark, "Oscillating Behavior of Network Traffic: A Ca= se Study
> Simulation", 1990
> http://grou= ps.csail.mit.edu/ana/Publications/Zhang-DDC-Oscillating-Behavior-of-Network= -Traffic-1990.pdf

I would really like this sort of stuff (and the self similarity paper=
already cited) revisited with modern traffic.

> Floyd & Jacobson, "The Synchronization of Periodic Routing Me= ssages", 1994
> htt= p://ee.lbl.gov/papers/sync_94.pdf

(thank you for the hyperlinks!)

One of my issues with the above paper is that it predates bufferbloat
being a prevailing problem on networks and the huge amount of
additional bandwidth now available. Routing message size and frequency
now is only a problem with BGP, and in virtualized routed
environments.

The other issue, is that most link technologies today have wildly
variable access times to the media itself (notably wireless and wifi),
so these naturally act to desynchronize routing updates in the
protocols I'm familiar with.

Neither of my points have been proved! I've been meaning to rip out
desynchronization from babel for wireless interfaces for years now....


>
> Lock-Out:
>
> Floyd & Jacobson, "On Traffic Phase Effects in Packet-Switche= d
> Gateways", 1992
> http://www.icir.org/floyd/papers/phase.pdf

*Classic* but also dated. Is there nothing more recent?

I will see what I can find on bursty traffic.

>
>
> --
> Wes Eddy
> MTI Systems
>
> _______________________________________________
> aqm mailing list
> aqm@ietf.org
> https://www.ietf.org/mailman/listinfo/aqm



--
Dave T=C3=A4ht

NSFW: https://w2.eff.org/Censorshi= p/Internet_censorship_bills/russell_0296_indecent.article

_______________________________________________
aqm mailing list
aqm@ietf.org
htt= ps://www.ietf.org/mailman/listinfo/aqm



--
=
Andrew McGre= gor=C2=A0|=C2=A0SRE= =C2=A0|=C2=A0andrewmcgr@google.com= =C2=A0|=C2=A0+61 4 10= 71 2221
--001a11c2957261d07804fca46d89-- From nobody Thu Jun 26 10:31:23 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5F0AB1B2C2E for ; Thu, 26 Jun 2014 10:31:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-0.001] autolearn=ham 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 MhNCjx7Ixi3y for ; Thu, 26 Jun 2014 10:31:20 -0700 (PDT) Received: from mail-ob0-x235.google.com (mail-ob0-x235.google.com [IPv6:2607:f8b0:4003:c01::235]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 642021B2C7B for ; Thu, 26 Jun 2014 10:29:15 -0700 (PDT) Received: by mail-ob0-f181.google.com with SMTP id wp4so4136174obc.26 for ; Thu, 26 Jun 2014 10:29:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type :content-transfer-encoding; bh=XN36khxLjTRX2Cr0pv1LQv8+NudYBh3gCvzt4hSOOAw=; b=dhFYFJZqa+TIJJTKVsNBucuiXqLqrVHEH0b/vGON+OUZfp30V7U9NsjmukjKy5zqo7 cHgM+7EBqcBytsTqD0WL3XtNun/ZOFzCZMotctRIEGJ5ayDSZmuQId+3V1KEUnKwfOvK Plyt5/HD/eKfU2b/NoCiSTUmZoz8xoQ8VPx3095qfMQOIpT4IaUeiq1nmVSVBDcpoZlr 5n7hvmBd291aSFael7Ve0G/9uYYvoHMoLEQbB70TwpCey49y1S3NiSOxsa0Y6AcQ/R5k pZYhvquAQTxjmW2+5Owsaar/7NnNIl5OwKHIKhx3PSDXg4QQW3BxFnvbJZLtnDmzyDvp /BJA== MIME-Version: 1.0 X-Received: by 10.60.145.225 with SMTP id sx1mr4758555oeb.75.1403803754826; Thu, 26 Jun 2014 10:29:14 -0700 (PDT) Received: by 10.202.48.200 with HTTP; Thu, 26 Jun 2014 10:29:14 -0700 (PDT) Date: Thu, 26 Jun 2014 10:29:14 -0700 Message-ID: From: Dave Taht To: "aqm@ietf.org" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/YSUMqeOFLyxeMzctMthvd6zqdiU Subject: [aqm] aqm conference call results? X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Jun 2014 17:31:21 -0000 there some slides presented that I'd like to refer to as to the aqm evaluation guide's directions that I'd like to see again. Link? As it is being broken up into an overview and a second document detailing tests, I'd like people to look over the tests proposed in http://tools.ietf.org/html/draft-sarker-rmcat-eval-test-01 as a possible inspiration. While I like the above a lot, it bothers me that it is only targeted at very low bandwidth scenarios (4mbit being the topmost). There are hopefully other tests proposed by other relevant working groups (ippm, http 2.0, sctp come to mind immediately), that I'd like to be aware of, and yet don't have the energy to sort through each wg to find. If there is a way to get a list of tests each wg considers important to work with, that would be a starting point. --=20 Dave T=C3=A4ht From nobody Thu Jun 26 10:53:06 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9DA6A1B2DA0 for ; Thu, 26 Jun 2014 10:53:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -115.152 X-Spam-Level: X-Spam-Status: No, score=-115.152 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_HI=-5, RP_MATCHES_RCVD=-0.651, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_WHITELIST=-100] autolearn=ham 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 zFF2gtvhD7n7 for ; Thu, 26 Jun 2014 10:53:01 -0700 (PDT) Received: from alln-iport-1.cisco.com (alln-iport-1.cisco.com [173.37.142.88]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9EC4A1B2C6D for ; Thu, 26 Jun 2014 10:43:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2135; q=dns/txt; s=iport; t=1403804619; x=1405014219; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=7qnyfIRvBzM9CSOAsLNY3+TH6SKlycx3XF7XMCZB8os=; b=k78kwIR5m0CYtpgZlk2vnh0QcEfuP6U7FdA5fHBrbMg+MC8xeSAQEEDo gb9I2qSSOgcciyve1AqiynNDsAz2O4sc5A58qFXL1baPjciEdLXeE8I2y AJ1Pf1Ut8TQ+5mtw2YFI6N5cX0qx6bRYaVWBa8QgyrW4EZCZhK874OXpO I=; X-Files: signature.asc : 195 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgUFAExarFOtJV2Q/2dsb2JhbABagw1SWrxWh0ABgQ0WdYQDAQEBAwEBAQFlBgsFCwIBCEYhBgslAgQOBQ6IIAMJCA27Qw2GUBeMW4IlB4MtgRYFkg+BQoULgX2BRowghg+DQoIw X-IronPort-AV: E=Sophos;i="5.01,554,1400025600"; d="asc'?scan'208";a="56181577" Received: from rcdn-core-8.cisco.com ([173.37.93.144]) by alln-iport-1.cisco.com with ESMTP; 26 Jun 2014 17:43:39 +0000 Received: from xhc-aln-x01.cisco.com (xhc-aln-x01.cisco.com [173.36.12.75]) by rcdn-core-8.cisco.com (8.14.5/8.14.5) with ESMTP id s5QHhcgl022651 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 26 Jun 2014 17:43:38 GMT Received: from xmb-rcd-x09.cisco.com ([169.254.9.143]) by xhc-aln-x01.cisco.com ([173.36.12.75]) with mapi id 14.03.0123.003; Thu, 26 Jun 2014 12:43:38 -0500 From: "Fred Baker (fred)" To: Dave Taht Thread-Topic: [aqm] aqm conference call results? Thread-Index: AQHPkWYpd6pDJvJld0ivK6Dvr76R1A== Date: Thu, 26 Jun 2014 17:43:38 +0000 Message-ID: <127D8A60-EC5C-4714-B711-73D75C86BE8D@cisco.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.19.64.116] Content-Type: multipart/signed; boundary="Apple-Mail=_27540AB2-43ED-4454-86C7-5EB310F11AC2"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/ckzx7LKP8h33tV0AqDA3xyC-a18 Cc: "aqm@ietf.org" Subject: Re: [aqm] aqm conference call results? X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Jun 2014 17:53:04 -0000 --Apple-Mail=_27540AB2-43ED-4454-86C7-5EB310F11AC2 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 On Jun 26, 2014, at 10:29 AM, Dave Taht wrote: > there some slides presented that I'd like to refer to as to the aqm > evaluation guide's directions that I'd like to see again. Link? >=20 > As it is being broken up into an overview and a second document > detailing tests, I'd like people to look over the tests proposed in >=20 > http://tools.ietf.org/html/draft-sarker-rmcat-eval-test-01 >=20 > as a possible inspiration. While I like the above a lot, it bothers me > that it is only targeted at very low bandwidth scenarios (4mbit being > the topmost). I would expect that=92s a bang-for-buck issue. The same problems happen = at 4 GBPS that happen at 4 MBPS, but they have important differences. A = session that moves a certain amount of data moves 1000 times faster, and = you might have 1000 times as many parallel sessions, with the =93law of = large numbers=94 implications. > There are hopefully other tests proposed by other relevant working > groups (ippm, http 2.0, sctp come to mind immediately), that I'd like > to be aware of, and yet don't have the energy to sort through each wg > to find. If there is a way to get a list of tests each wg considers > important to work with, that would be a starting point. >=20 >=20 > --=20 > Dave T=E4ht >=20 > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm --Apple-Mail=_27540AB2-43ED-4454-86C7-5EB310F11AC2 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iD8DBQFTrFvIbjEdbHIsm0MRAn8RAKCKALa8+EJ7jZhwJd2+2ocWEyAHHQCg8H4u 3TOzS/XxzO+fnGSoKMXCc6U= =sAWv -----END PGP SIGNATURE----- --Apple-Mail=_27540AB2-43ED-4454-86C7-5EB310F11AC2-- From nobody Fri Jun 27 02:00:36 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BCDFC1B2F2D for ; Fri, 27 Jun 2014 02:00:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.551 X-Spam-Level: X-Spam-Status: No, score=-1.551 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HELO_EQ_FR=0.35, SPF_PASS=-0.001] autolearn=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 jw15KlpSBF0H for ; Fri, 27 Jun 2014 02:00:33 -0700 (PDT) Received: from zproxy220.enst-bretagne.fr (zproxy220.enst-bretagne.fr [192.108.117.9]) by ietfa.amsl.com (Postfix) with ESMTP id E31B51B2F30 for ; Fri, 27 Jun 2014 02:00:21 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by zproxy220.enst-bretagne.fr (Postfix) with ESMTP id EEA3A3000E; Fri, 27 Jun 2014 11:00:20 +0200 (CEST) Received: from zproxy220.enst-bretagne.fr ([127.0.0.1]) by localhost (zproxy220.enst-bretagne.fr [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id 3ZzsKqTho8uD; Fri, 27 Jun 2014 11:00:17 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by zproxy220.enst-bretagne.fr (Postfix) with ESMTP id 17A9B30023; Fri, 27 Jun 2014 11:00:17 +0200 (CEST) X-Virus-Scanned: amavisd-new at zproxy220.enst-bretagne.fr Received: from zproxy220.enst-bretagne.fr ([127.0.0.1]) by localhost (zproxy220.enst-bretagne.fr [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id Adb3zUQiibbS; Fri, 27 Jun 2014 11:00:16 +0200 (CEST) Received: from [IPv6:2001:660:7301:3728:4560:5031:e675:8eb6] (passerellev6v4.enst-bretagne.fr [192.108.117.5]) by zproxy220.enst-bretagne.fr (Postfix) with ESMTPSA id D5F0F30021; Fri, 27 Jun 2014 11:00:16 +0200 (CEST) Content-Type: multipart/mixed; boundary="Apple-Mail=_722F8838-46DA-4FDB-A5E1-62104BC27675" Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) From: Nicolas KUHN In-Reply-To: Date: Fri, 27 Jun 2014 11:00:19 +0200 Message-Id: <1C1661D0-DE23-4D7A-B9B1-47AEC35AD6B7@telecom-bretagne.eu> References: To: Dave Taht X-Mailer: Apple Mail (2.1503) Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/VlE2B5sR3j18wdhjPhSh9NdGpAc Cc: "aqm@ietf.org" Subject: Re: [aqm] aqm conference call results? X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Jun 2014 09:00:34 -0000 --Apple-Mail=_722F8838-46DA-4FDB-A5E1-62104BC27675 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Dear Dave,=20 On Jun 26, 2014, at 7:29 PM, Dave Taht wrote: > there some slides presented that I'd like to refer to as to the aqm > evaluation guide's directions that I'd like to see again. Link? >=20 I attached them to this email.=20 > As it is being broken up into an overview and a second document > detailing tests, I'd like people to look over the tests proposed in >=20 > http://tools.ietf.org/html/draft-sarker-rmcat-eval-test-01 >=20 > as a possible inspiration. AFAIK, in the RMCAT group, there are two working documents [1] http://tools.ietf.org/html/draft-ietf-rmcat-eval-criteria-01 [2] http://tools.ietf.org/html/draft-sarker-rmcat-eval-test-01 I think that what we had written ( in evaluation-guidelines-00 ) tried = to be close to both [1] and [2]. Our idea was then to split our original = document in two and produce an equivalent to [1] in the update version ( = evaluation-guidelines-01 ). This document would focus on AQM related = issues and explains what aspects must be assessed, before diving into = specific tests details such as it is done in [2].=20 Regards,=20 Nicolas=20 --Apple-Mail=_722F8838-46DA-4FDB-A5E1-62104BC27675 Content-Disposition: inline; filename=update_eval_guidelines.pdf Content-Type: application/pdf; x-unix-mode=0644; name="update_eval_guidelines.pdf" Content-Transfer-Encoding: base64 JVBERi0xLjUKJdDUxdgKMzkgMCBvYmogPDwKL0xlbmd0aCAxNTA1ICAgICAgCi9GaWx0ZXIgL0Zs YXRlRGVjb2RlCj4+CnN0cmVhbQp42tVZWXMbNwx+16/go/ywa4LHLvnoThKn6dSNj0weOn3QyHLi qeXUztG/3w+keKy0snzkaDJjcYkFQOADAYIbKd4JKQ4ncm0kjITxBhQpdKdap61QvWpJdeJ2IS4m xxtCDx5bryw/h/EuPifYjFtmjY8n30xra7tCXj2f7LSh7UCLP85FpgHlhCFlIRJKU9upXpBtu06L +XJyIyYb7GJEJ0jaOyv+FSziWtV56fG2970koVvteq2FAhNJy0E6FZNjlnJGrH68WXlQU2Ac9JlW 4p8FyXjvnVhCE1NUHq9E4tGtxahBuRDUteFtkSMXKFQJJqZaMNq2G7jrwJnhA3pw+vG4da3vtWfX 5RhmfetgoQPJYCS4kyi6VSvbifiR1BiJdwemksVpNXNtJ0OEIvcyERKc4A9QkR0jETNHFNMihfQd 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LdzBPTzwXvdoBf7D+A8LgBuaA5XMr9vCNFlINeUKMsbHGB9jfIzxMcbHSlWyH25LmcrugYvKVR5/ XBRTeQ26KK7y9eaihGrw00UMl2WAthttN9puDarJP1FtzMk/uxNFIwplbmRzdHJlYW0KZW5kb2Jq CnN0YXJ0eHJlZgo3NDc1MQolJUVPRgo= --Apple-Mail=_722F8838-46DA-4FDB-A5E1-62104BC27675 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 > While I like the above a lot, it bothers me > that it is only targeted at very low bandwidth scenarios (4mbit being > the topmost). >=20 > There are hopefully other tests proposed by other relevant working > groups (ippm, http 2.0, sctp come to mind immediately), that I'd like > to be aware of, and yet don't have the energy to sort through each wg > to find. If there is a way to get a list of tests each wg considers > important to work with, that would be a starting point. >=20 >=20 > --=20 > Dave T=E4ht >=20 > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm --Apple-Mail=_722F8838-46DA-4FDB-A5E1-62104BC27675-- From nobody Mon Jun 30 01:19:16 2014 Return-Path: X-Original-To: aqm@ietfa.amsl.com Delivered-To: aqm@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8F1961A00F3 for ; Mon, 30 Jun 2014 01:19:13 -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_50=0.8, RCVD_IN_DNSWL_HI=-5] autolearn=ham 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 QbZ9nEn1igYF for ; Mon, 30 Jun 2014 01:19:11 -0700 (PDT) Received: from hoemail2.alcatel.com (hoemail2.alcatel.com [192.160.6.149]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 99D2E1A0089 for ; Mon, 30 Jun 2014 01:19:11 -0700 (PDT) Received: from fr712usmtp2.zeu.alcatel-lucent.com (h135-239-2-42.lucent.com [135.239.2.42]) by hoemail2.alcatel.com (8.13.8/IER-o) with ESMTP id s5U8J9cr019869 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Mon, 30 Jun 2014 03:19:10 -0500 (CDT) Received: from FR711WXCHHUB01.zeu.alcatel-lucent.com (fr711wxchhub01.zeu.alcatel-lucent.com [135.239.2.111]) by fr712usmtp2.zeu.alcatel-lucent.com (GMO) with ESMTP id s5U8J02r031676 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Mon, 30 Jun 2014 10:19:06 +0200 Received: from FR712WXCHMBA13.zeu.alcatel-lucent.com ([169.254.5.172]) by FR711WXCHHUB01.zeu.alcatel-lucent.com ([135.239.2.111]) with mapi id 14.02.0247.003; Mon, 30 Jun 2014 10:19:01 +0200 From: "LAUTENSCHLAEGER, Wolfram (Wolfram)" To: "aqm@ietf.org" Thread-Topic: [aqm] references on global sync & lock-out Thread-Index: AQHPj9ogTdWK5puM102Gni1NeyUzrZuJU07w Date: Mon, 30 Jun 2014 08:19:00 +0000 Message-ID: <0A452E1DADEF254C9A7AC1969B878128092D56@FR712WXCHMBA13.zeu.alcatel-lucent.com> References: <53A9C31A.8080200@mti-systems.com> In-Reply-To: <53A9C31A.8080200@mti-systems.com> Accept-Language: de-DE, en-US Content-Language: de-DE X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.239.27.41] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: http://mailarchive.ietf.org/arch/msg/aqm/3LusTZcGAq8m2LStRCuOxcDbhZA Cc: Wesley Eddy Subject: Re: [aqm] references on global sync & lock-out X-BeenThere: aqm@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Discussion list for active queue management and flow isolation." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Jun 2014 08:19:13 -0000 I published a paper that reveals the root cause of global synchronization: "A Deterministic TCP Bandwidth Sharing Model", http://arxiv.org/pdf/1404.41= 73v1 The findings in the paper are the theoretical basis for the GSP AQM proposa= l in http://tools.ietf.org/html/draft-lauten-aqm-gsp-00 -- Wolfram Lautenschlaeger Bell Labs > -----Urspr=FCngliche Nachricht----- > Von: aqm [mailto:aqm-bounces@ietf.org] Im Auftrag von Wesley Eddy > Gesendet: Dienstag, 24. Juni 2014 20:28 > An: aqm@ietf.org > Betreff: [aqm] references on global sync & lock-out >=20 > Per the discussion in the telecon today about references for global > synchronization and lock-out, I think some excellent classic ones are: >=20 > Global Synchronization: >=20 > Zhang & Clark, "Oscillating Behavior of Network Traffic: A Case Study > Simulation", 1990 http://groups.csail.mit.edu/ana/Publications/Zhang-DDC- > Oscillating-Behavior-of-Network-Traffic-1990.pdf >=20 > Floyd & Jacobson, "The Synchronization of Periodic Routing Messages", 199= 4 > http://ee.lbl.gov/papers/sync_94.pdf >=20 >=20 > Lock-Out: >=20 > Floyd & Jacobson, "On Traffic Phase Effects in Packet-Switched Gateways", > 1992 http://www.icir.org/floyd/papers/phase.pdf >=20 >=20 > -- > Wes Eddy > MTI Systems >=20 > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm