[Gen-art] Gen-ART Telechat review of draft-ietf-tcpm-initcwnd-06.txt

Suresh Krishnan <suresh.krishnan@ericsson.com> Wed, 12 December 2012 05:24 UTC

Return-Path: <suresh.krishnan@ericsson.com>
X-Original-To: gen-art@ietfa.amsl.com
Delivered-To: gen-art@ietfa.amsl.com
Received: from localhost (localhost []) by ietfa.amsl.com (Postfix) with ESMTP id 1B2EB21F8983 for <gen-art@ietfa.amsl.com>; Tue, 11 Dec 2012 21:24:30 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -106.599
X-Spam-Status: No, score=-106.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100]
Received: from mail.ietf.org ([]) by localhost (ietfa.amsl.com []) (amavisd-new, port 10024) with ESMTP id PpIo84hJfiWq for <gen-art@ietfa.amsl.com>; Tue, 11 Dec 2012 21:24:26 -0800 (PST)
Received: from imr3.ericy.com (imr3.ericy.com []) by ietfa.amsl.com (Postfix) with ESMTP id C3D2D21F8654 for <gen-art@ietf.org>; Tue, 11 Dec 2012 21:24:26 -0800 (PST)
Received: from eusaamw0711.eamcs.ericsson.se ([]) by imr3.ericy.com (8.13.8/8.13.8) with ESMTP id qBC5ONUn011708 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Tue, 11 Dec 2012 23:24:23 -0600
Received: from [] ( by smtps-am.internal.ericsson.com ( with Microsoft SMTP Server (TLS) id; Wed, 12 Dec 2012 00:24:22 -0500
Message-ID: <50C8146B.8090707@ericsson.com>
Date: Wed, 12 Dec 2012 00:21:47 -0500
From: Suresh Krishnan <suresh.krishnan@ericsson.com>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0
MIME-Version: 1.0
To: <draft-ietf-tcpm-initcwnd.all@tools.ietf.org>, General Area Review Team <gen-art@ietf.org>
X-Enigmail-Version: 1.4.6
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7bit
Subject: [Gen-art] Gen-ART Telechat review of draft-ietf-tcpm-initcwnd-06.txt
X-BeenThere: gen-art@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: "GEN-ART: General Area Review Team" <gen-art.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/gen-art>, <mailto:gen-art-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/gen-art>
List-Post: <mailto:gen-art@ietf.org>
List-Help: <mailto:gen-art-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/gen-art>, <mailto:gen-art-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 12 Dec 2012 05:24:30 -0000

I have been selected as the General Area Review Team (Gen-ART)
reviewer for this draft (for background on Gen-ART, please see

Please wait for direction from your document shepherd
or AD before posting a new version of the draft.

Document: draft-ietf-tcpm-initcwnd-06
Reviewer: Suresh Krishnan
Review Date: 2012/12/11
IESG Telechat date: 2012/12/13

Summary: This document is well written and is ready for publication as
an Experimental RFC. I do have some minor comments you may wish to address.


* Introduction

Intuitively I feel that an increased value of initcwnd is useful because
of the sizeable increase in the BDP (mainly due to the increase in
bandwidth). Is this correct? If so, it would be worth mentioning in the

* Section 2

I am not clear on why this document has to explicitly *allow* existing
implementations to have smaller initcwnd . Isn't this automatically the

"This increase is optional: a TCP MAY start with an initial window that
is smaller than 10 segments."

* Section 3

Not sure how the authors arrived at the following conclusion.

"A larger initial window will incentivize applications to use fewer
concurrent TCP connections."

Since the application (e.g. browser) developer and the TCP stack
developer are usually different, it is not clear why the application
developer would stop using multiple concurrent connections. Can you
clarify this a bit.

* Section 8

Isn't this only an issue for users on slow links which *also* have low RTTs?


* RFC6077 is listed in the references but not used in the document. Remove?

* Idnits complained about a line longer than 72 chars. I located this
line to be the title line of Section 6 "Disadvantages of...Connection"