From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-01-ewr.dyndns.com (mxout-100-ewr.mailhop.org [216.146.33.100]) by lists.bufferbloat.net (Postfix) with ESMTP id A1BA32E015C for ; Fri, 11 Mar 2011 10:05:22 -0800 (PST) Received: from scan-02-ewr.mailhop.org (scan-02-ewr.local [10.0.141.224]) by mail-01-ewr.dyndns.com (Postfix) with ESMTP id 28CF11FCA5E for ; Fri, 11 Mar 2011 18:05:22 +0000 (UTC) X-Spam-Score: 0.1 () X-Mail-Handler: MailHop by DynDNS X-Originating-IP: 75.145.127.229 Received: from gw.co.teklibre.org (75-145-127-229-Colorado.hfc.comcastbusiness.net [75.145.127.229]) by mail-01-ewr.dyndns.com (Postfix) with ESMTP id B26D11FC9A6 for ; Fri, 11 Mar 2011 18:05:20 +0000 (UTC) Received: from cruithne.co.teklibre.org (unknown [IPv6:2002:4b91:7fe5:1::20]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "cruithne.co.teklibre.org", Issuer "CA Cert Signing Authority" (verified OK)) by gw.co.teklibre.org (Postfix) with ESMTPS id 420AD5E9C7 for ; Fri, 11 Mar 2011 11:05:20 -0700 (MST) Received: by cruithne.co.teklibre.org (Postfix, from userid 1000) id 4DE38120844; Fri, 11 Mar 2011 11:05:18 -0700 (MST) From: d@taht.net (Dave =?utf-8?Q?T=C3=A4ht?=) To: Stephen Hemminger Organization: Teklibre - http://www.teklibre.com References: <6210AF7E-3EB3-4199-A87B-A54B0F73A106@gmail.com> <20110311092157.23dea5e8@nehalam> Date: Fri, 11 Mar 2011 11:05:18 -0700 In-Reply-To: <20110311092157.23dea5e8@nehalam> (Stephen Hemminger's message of "Fri, 11 Mar 2011 09:21:57 -0800") Message-ID: <878vwlr0rl.fsf@cruithne.co.teklibre.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: bloat@lists.bufferbloat.net Subject: Re: [Bloat] Taxonomy of various sender-side TCPs X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Mar 2011 18:05:23 -0000 Stephen Hemminger writes: > On Fri, 11 Mar 2011 09:24:33 +0200 > Jonathan Morton wrote: >> Currently, CUBIC is the default TCP send-side algorithm in Linux. It >> seems likely that it will react correctly to ECN marking, but that a >> higher rate of marking may be needed to bring it down to a given >> buffering level. From what I've read, SFB should be able to probe >> for the correct marking rate on a per-flow basis, which is nice. >> >> On the subject of ECN, my impression is that YouTube currently >> doesn't enable it, but a one-man company I recently downloaded some >> stuff from does. I wonder if there's any reliable data on how many >> of the most popular sites enable ECN if you ask for it. Personally, >> I think IPv6 and ECN should probably go together - v6 gear is new or >> upgraded anyway so there shouldn't be any legacy problems. I agree, but lack data. What TCP algorithms are available in the IPv6 stack on Linux? I know SFB works with both ipv4 and ipv6... ECN has been enabled on kernel org for 8+ years. > > Even TCP window scaling is problematic. Many consumer bits of gear are seriously > broken. I have had to turn off WS on my laptop to deal with hotel and conference > wireless front ends. Good tip. -- Dave Taht http://nex-6.taht.net