From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qw0-f50.google.com (mail-qw0-f50.google.com [209.85.216.50]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 7CA5E2001A1 for ; Tue, 24 Jan 2012 14:06:50 -0800 (PST) Received: by qabg27 with SMTP id g27so3153618qab.16 for ; Tue, 24 Jan 2012 14:06:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=sender:message-id:date:from:organization:user-agent:mime-version:to :cc:subject:references:in-reply-to:content-type :content-transfer-encoding; bh=3lKdX0eXpGbE3JI0PCoyaqVGW0T0sX5oIxoawW4DIdM=; b=ruXtqaDa8E/aZOs1ly7WrKkWnQkEa0C1skQhOfb8sybmMfr6Cb+34jP2ykImGDtJHI 8jz2NhJ5i0R/JdTj4fTnOGOgA0szo3EpYMifGCT3UDp74wnnUpY20Zx/WrcswTOwDFQq 1BraadqbXdWujfKqrB5XDA5KPQNec/dXYyag8= Received: by 10.224.184.73 with SMTP id cj9mr17474032qab.80.1327442809491; Tue, 24 Jan 2012 14:06:49 -0800 (PST) Received: from [192.168.1.27] (c-24-63-191-17.hsd1.ma.comcast.net. [24.63.191.17]) by mx.google.com with ESMTPS id eb4sm18305098qab.4.2012.01.24.14.06.47 (version=SSLv3 cipher=OTHER); Tue, 24 Jan 2012 14:06:48 -0800 (PST) Sender: Jim Gettys Message-ID: <4F1F2B76.4040101@freedesktop.org> Date: Tue, 24 Jan 2012 17:06:46 -0500 From: Jim Gettys Organization: Bell Labs User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111124 Thunderbird/8.0 MIME-Version: 1.0 To: Richard Brown References: <6B6AFDDC-DA88-4C49-B9BA-A5AC9BD5DC47@intermapper.com> In-Reply-To: <6B6AFDDC-DA88-4C49-B9BA-A5AC9BD5DC47@intermapper.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: "cerowrt-devel@lists.bufferbloat.net" Subject: Re: [Cerowrt-devel] Infoworld: Google thoughts about speeding up internet X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Jan 2012 22:06:50 -0000 On 01/24/2012 04:50 PM, Richard Brown wrote: > Infoworld has an article that points to a Google Blog that has a few suggestions for speeding up TCP connections. > > Infoworld: http://www.networkworld.com/news/2012/012412-google-looks-to-speed-up-255231.html > Google Blog: http://googlecode.blogspot.com/2012/01/lets-make-tcp-faster.html#comment-form > > It seems that these suggestions (which include increasing initial congestion window to 10 packets, and decreasing initial timeout to one second) would make bufferbloat worse in the outbound direction. > > I am somewhat relieved that there are a couple comments to this effect in the blog page above. I don't know if the author understands the bufferbloat problem fully, though. > > Rich Brown > Hanover, NH > I'll be talking with several Googler's about this next week. I sent mail, as their blogger site defeated me. Youchung Cheng got back to me promptly a few minutes ago. I already wrote an ID about #1; IW 10 I think is evil unless correspondingly fewer connections are used to make the situation no worse than it already is for transient bufferbloat. I'm actually most worried about #2; reducing the open timeout in the face of what netalyzr shows would be a real bummer I would guess. I have no problems with #3. #4 might or might not be ok, but I think should be studied more carefully in light of bufferbloat and the fact that congestion avoidance is already having severe indigestion given the size of the buffers. Most people have been simulating the Internet the way it should be, rather than the way it actually is, unfortunately. - jim