From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-34-ewr.dyndns.com (mxout-111-ewr.mailhop.org [216.146.33.111]) by lists.bufferbloat.net (Postfix) with ESMTP id A251C2E0134 for ; Fri, 25 Feb 2011 18:42:24 -0800 (PST) Received: from scan-32-ewr.mailhop.org (scan-32-ewr.local [10.0.141.238]) by mail-34-ewr.dyndns.com (Postfix) with ESMTP id CBFAC708A3E for ; Sat, 26 Feb 2011 02:42:02 +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-34-ewr.dyndns.com (Postfix) with ESMTP id 8D561708404; Sat, 26 Feb 2011 02:41:58 +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 EAFF35F1EA; Fri, 25 Feb 2011 19:41:57 -0700 (MST) Received: by cruithne.co.teklibre.org (Postfix, from userid 1000) id 9994A121B79; Fri, 25 Feb 2011 19:41:55 -0700 (MST) From: d@taht.net (Dave =?utf-8?Q?T=C3=A4ht?=) To: Jesper Dangaard Brouer Organization: Teklibre - http://www.teklibre.com References: <4D6668F4.5010705@freedesktop.org> <4D668827.8060508@freedesktop.org> <1298567313.2814.7.camel@edumazet-laptop> <87sjvds2r7.fsf@cruithne.co.teklibre.org> <1298575769.2659.10.camel@edumazet-laptop> <1298632912.21810.33.camel@traveldev.cxnet.dk> <1298634859.2659.44.camel@edumazet-laptop> <1298648937.28000.41.camel@traveldev.cxnet.dk> <1298651627.2659.84.camel@edumazet-laptop> <1298654104.28000.52.camel@traveldev.cxnet.dk> Date: Fri, 25 Feb 2011 19:41:55 -0700 In-Reply-To: <1298654104.28000.52.camel@traveldev.cxnet.dk> (Jesper Dangaard Brouer's message of "Fri, 25 Feb 2011 18:15:04 +0100") Message-ID: <87aahj7c0c.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=utf-8 Content-Transfer-Encoding: quoted-printable Cc: bloat-devel@lists.bufferbloat.net, herbert@gondor.apana.org.au, Van Jacobson , shalunov@shlang.com, bloat@lists.bufferbloat.net Subject: Re: [Bloat] GSO 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: Sat, 26 Feb 2011 02:42:24 -0000 Jesper Dangaard Brouer writes: > On Fri, 2011-02-25 at 17:33 +0100, Eric Dumazet wrote: >> Le vendredi 25 f=C3=A9vrier 2011 =C3=A0 16:48 +0100, Jesper Dangaard Bro= uer a >> =C3=A9crit : >>=20 =20 >> > Disabling GSO on speed server fixed the problem as can be seen on grap= h: >> > http://people.netfilter.org/hawk/dropbox/bloat_vs_GSO/speed-to-grantof= ten-solved.png >> >=20 >> > The really strange part when troubleshooting this issue was that the >> > throughput as fine between the two customer end-boxes ("grantoften" and >> > "pc314a") as can be see here: >> > http://people.netfilter.org/hawk/dropbox/bloat_vs_GSO/pc314a-to-granto= ften-1.png >> >=20 >> >=20 >>=20 >> Its a bit hard to interpret these graphs, I am a bit lost... >> What exactly is sampled ? Is it from tcpdump analysis or output from >> HTB/SFQ stats ? > > The graph is generated (with GNUplot) with data from the > throughput-latency tool called "thrulay". Its created by Stanislav > Shalunov, and its homepage is here: http://shlang.com/thrulay/ > > I really love this "thrulay" tool, as it measure both the throughput and > records the TCP sessions experienced delay. And the output can be used > directly by GNUplot. Nice! :-) I find the 10ms granularity on both graphs rather interesting. One of my issues with HTB (when last I checked) is that it does odd things across the clock interval.=20 My assumption is that both systems are running stock (100HZ) kernels? What would a 1ms clock do on these plots? And/or the Linux-rt patch?=20 --=20 Dave Taht http://nex-6.taht.net