From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfgang Rosner Subject: Re: One way TCP bottleneck over 6 x Gbit tecl aggregated link // Kernel issue Date: Thu, 26 Mar 2015 20:34:05 +0100 Message-ID: <201503262034.05499.wrosner@tirnet.de> References: <201503210110.48980.wrosner@tirnet.de> <201503230157.46489.wrosner@tirnet.de> <1427077997.25985.59.camel@edumazet-glaptop2.roam.corp.google.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE To: Eric Dumazet , netdev@vger.kernel.org Return-path: Received: from mail.tirnet.de ([217.7.138.221]:61557 "EHLO mail.tirnet.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751864AbbCZTeK convert rfc822-to-8bit (ORCPT ); Thu, 26 Mar 2015 15:34:10 -0400 In-Reply-To: <1427077997.25985.59.camel@edumazet-glaptop2.roam.corp.google.com> Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: Hello, Eric Am Montag, 23. M=C3=A4rz 2015 03:33:17 schrieben Sie: > On Mon, 2015-03-23 at 01:57 +0100, Wolfgang Rosner wrote: > > Are you ready to assist me on this track? > > First check if the problem is already solved, using this git tree ? > > http://git.kernel.org/cgit/linux/kernel/git/davem/net.git Does not look like that :-( I tried both 3.19.2 frome kernel.org and=20 a git clone frome above adress from "master" this morning. $ uname -a Linux cruncher 4.0.0-rc5+ #1 SMP Thu Mar 26 08:48:08 CET 2015 x86_64 GN= U/Linux Sorry when it took some time. I've built a workaround for my aufs nfsroot to get rid of that, at leas= t for=20 testing. Both kernels were built w/o aufs patches, so we cannot blame this anymo= re (I've learned that people like to do so...) ----------- I tried sequential run to check for jitter and to allow for adaptation for i in `seq 10` ; do iperf -c 192.168.130.225 -t 100 ; done 3.17 / 3.30 / 3.16 / 3.19 / 3.29 / 3.29 / 3.35 / 3.32 / 3.22 / 3.32 Gbits/sec =2E..full bandwith at shared Link utilisation: [ 4] 0.0-10.0 sec 3.31 GBytes 2.84 Gbits/sec [ 3] 0.0-10.0 sec 3.32 GBytes 2.85 Gbits/sec [SUM] 0.0-10.0 sec 6.63 GBytes 5.69 Gbits/sec =2E..full bandwith (5.66 Gbits/sec) in the opposite direction (Test figures are from davem 4.0.0-rc5+, on 3.19.2 they were quite the = same) ------------------------ Tried a look at differences in kernel .config between the versions where the problem occured diff /boot/config-3.16.0-0.bpo.4-amd64 /boot/config-3.19.0 | less there is one occurence of TCP '> # CONFIG_TCP_CONG_DCTCP is not set but it should not hurt if it is not set, should it? All the other stuff does not ring any bell wiht my (very limited) range= of=20 experience. So what next? Wolfgang Rosner