From nobody Wed Oct 14 10:46:42 2015 Return-Path: X-Original-To: tcpprague@ietfa.amsl.com Delivered-To: tcpprague@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E774A1AD09B; Wed, 14 Oct 2015 10:46:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.01 X-Spam-Level: X-Spam-Status: No, score=-6.01 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, J_CHICKENPOX_21=0.6, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_HI=-5, T_RP_MATCHES_RCVD=-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 tQ6bg1iFfWb2; Wed, 14 Oct 2015 10:46:32 -0700 (PDT) Received: from smtp-fr.alcatel-lucent.com (fr-hpgre-esg-01.alcatel-lucent.com [135.245.210.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 821B71AD087; Wed, 14 Oct 2015 10:46:32 -0700 (PDT) Received: from fr711usmtp1.zeu.alcatel-lucent.com (unknown [135.239.2.122]) by Websense Email Security Gateway with ESMTPS id 9D00EF21E4C48; Wed, 14 Oct 2015 17:46:27 +0000 (GMT) Received: from FR712WXCHHUB03.zeu.alcatel-lucent.com (fr712wxchhub03.zeu.alcatel-lucent.com [135.239.2.74]) by fr711usmtp1.zeu.alcatel-lucent.com (GMO) with ESMTP id t9EHkUCO009227 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Wed, 14 Oct 2015 19:46:30 +0200 Received: from FR711WXCHMBA05.zeu.alcatel-lucent.com ([169.254.1.213]) by FR712WXCHHUB03.zeu.alcatel-lucent.com ([135.239.2.74]) with mapi id 14.03.0195.001; Wed, 14 Oct 2015 19:46:30 +0200 From: "De Schepper, Koen (Koen)" To: "tcpPrague@ietf.org" , =?utf-8?B?TWlyamEgS8O8aGxld2luZA==?= , "tcpm@ietf.org Extensions" , Bob Briscoe , Richard Scheffenegger Thread-Topic: AccECN fallback to classic ECN, was: RE: [tcpm] Fwd: New Version Notification for draft-kuehlewind-tcpm-accurate-ecn-04.txt Thread-Index: AQHQ6xecH9RU3iyM/EmwHF1qn1drPp5rUo5ggAAlR7A= Date: Wed, 14 Oct 2015 17:46:30 +0000 Message-ID: References: <20150906231947.7501.54950.idtracker@ietfa.amsl.com> <55F055AD.3050809@tik.ee.ethz.ch> Accept-Language: nl-BE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.239.27.39] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: [tcpPrague] AccECN fallback to classic ECN, was: RE: [tcpm] Fwd: New Version Notification for draft-kuehlewind-tcpm-accurate-ecn-04.txt X-BeenThere: tcpprague@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "To coordinate implementation and standardisation of TCP Prague across platforms. TCP Prague will be an evolution of DCTCP designed to live alongside other TCP variants and derivatives." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Oct 2015 17:46:40 -0000 QW4gYWRkaXRpb25hbCB0aG91Z2h0LCBhbHNvIHVzZWZ1bCBmb3IgdGhlIFRDUC1QcmFndWUgbGlz dDoNCg0KLSBJZiB0aGUgZ29hbCBpcyB0byByZXBsYWNlIGNsYXNzaWMgRUNOIGVjaG9pbmcgb24g dGhlIEludGVybmV0LCBpc24ndCBpdCBiZXR0ZXIgTk9UIHRvIGZhbGwgYmFjayB0byBjbGFzc2lj IEVDTiwgYnV0IGJldHRlciAoYXMgYSBNVVNUPykgYWx3YXlzIHRvIGRyb3A/IEl0IHdpbGwgYmUg YW4gaW5jZW50aXZlIHRvIHVwZ3JhZGUgb24gdGhlIEludGVybmV0IChhbmQgYXZvaWQgY2xhc3Np YyBFQ04gZWNob2luZyBiZWhhdmlvcikuIEluIHRoZSBkYXRhY2VudGVyLCBpdCBzaG91bGQgcHJv YmFibHkgZmFsbCBiYWNrIGFzc3VtaW5nIHRoZXJlIGlzIGEgbGFyZ2UgZGVwbG95bWVudCBiYXNl IG9mICdjbGFzc2ljIEVDTiBlY2hvaW5nJyBEQ1RDUHMuDQoNClJlZ2FyZHMsDQpLb2VuLg0KDQoN Cj4gLS0tLS1PcmlnaW5hbCBNZXNzYWdlLS0tLS0NCj4gRnJvbTogRGUgU2NoZXBwZXIsIEtvZW4g KEtvZW4pDQo+IFNlbnQ6IHdvZW5zZGFnIDE0IG9rdG9iZXIgMjAxNSAxOTozNw0KPiBUbzogJ01p cmphIEvDvGhsZXdpbmQnOyB0Y3BtQGlldGYub3JnIEV4dGVuc2lvbnM7IEJvYiBCcmlzY29lOyBS 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QGlldGYub3JnDQo+ID4gaHR0cHM6Ly93d3cuaWV0Zi5vcmcvbWFpbG1hbi9saXN0aW5mby90Y3Bt DQo= From nobody Mon Oct 19 12:14:44 2015 Return-Path: X-Original-To: tcpprague@ietfa.amsl.com Delivered-To: tcpprague@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9AEA81B2BFD; Mon, 19 Oct 2015 12:14:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, 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 4XWRqez6fZOk; Mon, 19 Oct 2015 12:14:38 -0700 (PDT) Received: from server.dnsblock1.com (server.dnsblock1.com [85.13.236.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9CDA91B2C13; Mon, 19 Oct 2015 12:14:38 -0700 (PDT) Received: from cm-84.208.86.220.getinternet.no ([84.208.86.220]:35251 helo=[192.168.0.116]) by server.dnsblock1.com with esmtpsa (TLSv1.2:DHE-RSA-AES128-SHA:128) (Exim 4.86) (envelope-from ) id 1ZoFtA-0002S1-G5; Mon, 19 Oct 2015 20:14:32 +0100 References: <20151019190039.23693.64756.idtracker@ietfa.amsl.com> To: tcpm IETF list , "De Schepper, Koen (Koen)" , Praveen Balasubramanian From: Bob Briscoe X-Forwarded-Message-Id: <20151019190039.23693.64756.idtracker@ietfa.amsl.com> Message-ID: <56254117.4000700@bobbriscoe.net> Date: Mon, 19 Oct 2015 20:14:31 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: <20151019190039.23693.64756.idtracker@ietfa.amsl.com> Content-Type: multipart/alternative; boundary="------------040901080408020304070000" X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.dnsblock1.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - bobbriscoe.net X-Get-Message-Sender-Via: server.dnsblock1.com: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: server.dnsblock1.com: in@bobbriscoe.net Archived-At: Cc: "Scheffenegger, Richard" , Mirja Kuehlewind , TCP Prague IETF List Subject: [tcpPrague] Updated AccECN to draft-kuehlewind-tcpm-accurate-ecn-05.txt X-BeenThere: tcpprague@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "To coordinate implementation and standardisation of TCP Prague across platforms. TCP Prague will be an evolution of DCTCP designed to live alongside other TCP variants and derivatives." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Oct 2015 19:14:41 -0000 This is a multi-part message in MIME format. --------------040901080408020304070000 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Folks, We just posted an updated version, mainly fixing problems Koen and Praveen pointed out, as well as stuff we (the authors) noticed, particularly from Mira starting to implement it. We're asking the chairs of the IETF tcpm list if they can put out a call for chartering work on accurate ECN in the tcpm WG. If that succeeds, it would start on the path to becoming an (experimental) change to the TCP wire protocol. So the more people who read it, send critique to the tcpm list, attempt to implement it, or describe/implement alternative ways to solve the same problem, the better. Here's an overview of the diffs: From 04 to 05:: * Corrected ambiguity between Classic ECN and Classic ECN feedback throughout * Changed MUST to SHOULD send AccECN option on SYN/ACK last ACK of 3WHS and first data segment from client, to allow for cached knowledge of option traversal problems. * Removed duplication of normative language about sending a full- length option in the sections on "The AccECN Option" and "Usage of the AccECN Option", and mutually cross referenced. * Acknowledged Koen De Schepper and Praveen Balasubramanian * Noted in Appendix that algo to beacon a full-length option is work-in-progress * Editorial corrections and clarifications throughout Bob -------- Forwarded Message -------- Subject: New Version Notification for draft-kuehlewind-tcpm-accurate-ecn-05.txt Date: Mon, 19 Oct 2015 12:00:39 -0700 From: internet-drafts@ietf.org To: Mirja Kuehlewind , "Mirja Kühlewind" , Richard Scheffenegger , Bob Briscoe A new version of I-D, draft-kuehlewind-tcpm-accurate-ecn-05.txt has been successfully submitted by Bob Briscoe and posted to the IETF repository. Name: draft-kuehlewind-tcpm-accurate-ecn Revision: 05 Title: More Accurate ECN Feedback in TCP Document date: 2015-10-19 Group: Individual Submission Pages: 38 URL: https://www.ietf.org/internet-drafts/draft-kuehlewind-tcpm-accurate-ecn-05.txt Status: https://datatracker.ietf.org/doc/draft-kuehlewind-tcpm-accurate-ecn/ Htmlized: https://tools.ietf.org/html/draft-kuehlewind-tcpm-accurate-ecn-05 Diff: https://www.ietf.org/rfcdiff?url2=draft-kuehlewind-tcpm-accurate-ecn-05 Abstract: Explicit Congestion Notification (ECN) is a mechanism where network nodes can mark IP packets instead of dropping them to indicate incipient congestion to the end-points. Receivers with an ECN- capable transport protocol feed back this information to the sender. ECN is specified for TCP in such a way that only one feedback signal can be transmitted per Round-Trip Time (RTT). Recently, new TCP mechanisms like Congestion Exposure (ConEx) or Data Center TCP (DCTCP) need more accurate ECN feedback information whenever more than one marking is received in one RTT. This document specifies an experimental scheme to provide more than one feedback signal per RTT in the TCP header. Given TCP header space is scarce, it overloads the three existing ECN-related flags in the TCP header and provides additional information in a new TCP option. 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 --------------040901080408020304070000 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit Folks,

We just posted an updated version, mainly fixing problems Koen and Praveen pointed out, as well as stuff we (the authors) noticed, particularly from Mira starting to implement it.

We're asking the chairs of the IETF tcpm list if they can put out a call for chartering work on accurate ECN in the tcpm WG.
If that succeeds, it would start on the path to becoming an (experimental) change to the TCP wire protocol. So the more people who read it, send critique to the tcpm list, attempt to implement it, or describe/implement alternative ways to solve the same problem, the better.


Here's an overview of the diffs:

   From 04 to 05::

      *  Corrected ambiguity between Classic ECN and Classic ECN
         feedback throughout

      *  Changed MUST to SHOULD send AccECN option on SYN/ACK last ACK
         of 3WHS and first data segment from client, to allow for cached
         knowledge of option traversal problems.

      *  Removed duplication of normative language about sending a full-
         length option in the sections on "The AccECN Option" and "Usage
         of the AccECN Option", and mutually cross referenced.

      *  Acknowledged Koen De Schepper and Praveen Balasubramanian

      *  Noted in Appendix that algo to beacon a full-length option is
         work-in-progress

      *  Editorial corrections and clarifications throughout

Bob


-------- Forwarded Message --------
Subject: New Version Notification for draft-kuehlewind-tcpm-accurate-ecn-05.txt
Date: Mon, 19 Oct 2015 12:00:39 -0700
From: internet-drafts@ietf.org
To: Mirja Kuehlewind <mirja.kuehlewind@tik.ee.ethz.ch>, "Mirja Kühlewind" <mirja.kuehlewind@tik.ee.ethz.ch>, Richard Scheffenegger <rs@netapp.com>, Bob Briscoe <ietf@bobbriscoe.net> 


A new version of I-D, draft-kuehlewind-tcpm-accurate-ecn-05.txt
has been successfully submitted by Bob Briscoe and posted to the
IETF repository.

Name:		draft-kuehlewind-tcpm-accurate-ecn
Revision:	05
Title:		More Accurate ECN Feedback in TCP
Document date:	2015-10-19
Group:		Individual Submission
Pages:		38
URL:            https://www.ietf.org/internet-drafts/draft-kuehlewind-tcpm-accurate-ecn-05.txt
Status:         https://datatracker.ietf.org/doc/draft-kuehlewind-tcpm-accurate-ecn/
Htmlized:       https://tools.ietf.org/html/draft-kuehlewind-tcpm-accurate-ecn-05
Diff:           https://www.ietf.org/rfcdiff?url2=draft-kuehlewind-tcpm-accurate-ecn-05

Abstract:
   Explicit Congestion Notification (ECN) is a mechanism where network
   nodes can mark IP packets instead of dropping them to indicate
   incipient congestion to the end-points.  Receivers with an ECN-
   capable transport protocol feed back this information to the sender.
   ECN is specified for TCP in such a way that only one feedback signal
   can be transmitted per Round-Trip Time (RTT).  Recently, new TCP
   mechanisms like Congestion Exposure (ConEx) or Data Center TCP
   (DCTCP) need more accurate ECN feedback information whenever more
   than one marking is received in one RTT.  This document specifies an
   experimental scheme to provide more than one feedback signal per RTT
   in the TCP header.  Given TCP header space is scarce, it overloads
   the three existing ECN-related flags in the TCP header and provides
   additional information in a new TCP option.

                                                                                  


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


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