Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757667AbXIZKUo (ORCPT ); Wed, 26 Sep 2007 06:20:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754561AbXIZKUh (ORCPT ); Wed, 26 Sep 2007 06:20:37 -0400 Received: from mail.gmx.net ([213.165.64.20]:44274 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1754349AbXIZKUg (ORCPT ); Wed, 26 Sep 2007 06:20:36 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1+f3CsheYqfNIKrfapXTWpgtZrXKjyPoOaUgthIdw 28ve1wDFMA/IdC Subject: Re: Network slowdown due to CFS From: Mike Galbraith To: Martin Michlmayr Cc: Ingo Molnar , Srivatsa Vaddagiri , linux-kernel@vger.kernel.org In-Reply-To: <20070926085202.GE3337@deprecation.cyrius.com> References: <20070926085202.GE3337@deprecation.cyrius.com> Content-Type: text/plain Date: Wed, 26 Sep 2007 12:20:32 +0200 Message-Id: <1190802032.7318.1.camel@Homer.simpson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.8.2 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2772 Lines: 61 On Wed, 2007-09-26 at 10:52 +0200, Martin Michlmayr wrote: > I noticed that my network performance has gone down from 2.6.22 > >from [ 3] 0.0-10.0 sec 113 MBytes 95.0 Mbits/sec > to [ 3] 0.0-10.0 sec 75.7 MBytes 63.3 Mbits/sec > with 2.6.23-rc1 (and 2.6.23-rc8), as measured with iperf. FWIW, on my box blasting localhost, I see the opposite, repeatably. root@Homer: iperf -v iperf version 2.0.2 (03 May 2005) pthreads 2.6.22.1-smp for i in `seq 1 3`; do iperf -c localhost; done >> /xx ------------------------------------------------------------ Client connecting to localhost, TCP port 5001 TCP window size: 49.2 KByte (default) ------------------------------------------------------------ [ 3] local 127.0.0.1 port 21383 connected with 127.0.0.1 port 5001 [ 3] 0.0-10.1 sec 518 MBytes 432 Mbits/sec ------------------------------------------------------------ Client connecting to localhost, TCP port 5001 TCP window size: 49.2 KByte (default) ------------------------------------------------------------ [ 3] local 127.0.0.1 port 21384 connected with 127.0.0.1 port 5001 [ 3] 0.0-10.0 sec 325 MBytes 273 Mbits/sec ------------------------------------------------------------ Client connecting to localhost, TCP port 5001 TCP window size: 49.2 KByte (default) ------------------------------------------------------------ [ 3] local 127.0.0.1 port 21385 connected with 127.0.0.1 port 5001 [ 3] 0.0-10.0 sec 434 MBytes 363 Mbits/sec 2.6.23-rc8-smp-d for i in `seq 1 3`; do iperf -c localhost; done >> /xx ------------------------------------------------------------ Client connecting to localhost, TCP port 5001 TCP window size: 49.2 KByte (default) ------------------------------------------------------------ [ 3] local 127.0.0.1 port 11650 connected with 127.0.0.1 port 5001 [ 3] 0.0-10.0 sec 2.01 GBytes 1.72 Gbits/sec ------------------------------------------------------------ Client connecting to localhost, TCP port 5001 TCP window size: 49.2 KByte (default) ------------------------------------------------------------ [ 3] local 127.0.0.1 port 11651 connected with 127.0.0.1 port 5001 [ 3] 0.0-10.0 sec 2.02 GBytes 1.74 Gbits/sec ------------------------------------------------------------ Client connecting to localhost, TCP port 5001 TCP window size: 49.2 KByte (default) ------------------------------------------------------------ [ 3] local 127.0.0.1 port 11652 connected with 127.0.0.1 port 5001 [ 3] 0.0-10.0 sec 2.10 GBytes 1.81 Gbits/sec - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/