From owner-freebsd-net@FreeBSD.ORG Wed Aug 14 09:27:19 2013 Return-Path: Delivered-To: net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 275D95D8; Wed, 14 Aug 2013 09:27:19 +0000 (UTC) (envelope-from lstewart@freebsd.org) Received: from lauren.room52.net (lauren.room52.net [210.50.193.198]) by mx1.freebsd.org (Postfix) with ESMTP id DDCE82A3B; Wed, 14 Aug 2013 09:27:18 +0000 (UTC) Received: from lstewart.caia.swin.edu.au (lstewart.caia.swin.edu.au [136.186.229.95]) by lauren.room52.net (Postfix) with ESMTPSA id 95AFE7E81E; Wed, 14 Aug 2013 19:27:15 +1000 (EST) Message-ID: <520B4D73.90408@freebsd.org> Date: Wed, 14 Aug 2013 19:27:15 +1000 From: Lawrence Stewart User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:17.0) Gecko/20130801 Thunderbird/17.0.7 MIME-Version: 1.0 To: "Eggert, Lars" Subject: Re: TCP Initial Window 10 MFC References: <201307051458.r65EwObo066269@svn.freebsd.org> <520AED2F.4050001@freebsd.org> <918804B0-BED8-4E49-9D70-01DDA6F257B3@netapp.com> In-Reply-To: <918804B0-BED8-4E49-9D70-01DDA6F257B3@netapp.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=0.0 required=5.0 tests=UNPARSEABLE_RELAY autolearn=unavailable version=3.3.2 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on lauren.room52.net Cc: Andre Oppermann , "freebsd-net@freebsd.org" X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Aug 2013 09:27:19 -0000 Hi Lars, On 08/14/13 18:46, Eggert, Lars wrote: > Hi, > > On Aug 14, 2013, at 10:36, Lawrence Stewart wrote: >> I don't think this change should have been MFCed, at least not in its >> current form. > > FYI, Google's own data as presented in the HTTPBIS working group of the recent Berlin IETF shows that 10 is too high for ~25% of their web connections: see slide 2 of http://www.ietf.org/proceedings/87/slides/slides-87-httpbis-5.pdf > > (That slide shows a CDF of CWND values the server used at the end of a web transaction.) Thanks for the pointer - very interesting. Do you recall if they said how many flows made up the CDF? Cheers, Lawrence