From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752919Ab0AYOTp (ORCPT ); Mon, 25 Jan 2010 09:19:45 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752173Ab0AYOTo (ORCPT ); Mon, 25 Jan 2010 09:19:44 -0500 Received: from mail.gmx.net ([213.165.64.20]:53778 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1750987Ab0AYOTo (ORCPT ); Mon, 25 Jan 2010 09:19:44 -0500 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX18B7VZeQBQBfZr/tMJ6Yv4wI1GD7krJTmLG9QmUAD 8d5e/xB0/u9jvo Subject: Re: netperf ~50% regression with 2.6.33-rc1, bisect to 1b9508f From: Mike Galbraith To: Peter Zijlstra Cc: Lin Ming , Ingo Molnar , "Zhang, Yanmin" , lkml In-Reply-To: <1264428229.4283.1833.camel@laptop> References: <1264413826.3642.88.camel@minggr.sh.intel.com> <1264428229.4283.1833.camel@laptop> Content-Type: text/plain Date: Mon, 25 Jan 2010 15:19:39 +0100 Message-Id: <1264429179.5881.9.camel@marge.simson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.24.1.1 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-FuHaFi: 0.59999999999999998 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2010-01-25 at 15:03 +0100, Peter Zijlstra wrote: > On Mon, 2010-01-25 at 18:03 +0800, Lin Ming wrote: > > Hi, > > > > The netperf lookback regression comes back again. > > UDP stream test has ~50% regression with 2.6.33-rc1 compared to 2.6.32. > > > > Testing machine: Nehalem, 2 sockets, 4 cores, hyper thread, 4G mem > > Server and client are bind to different physical cpu. > > > > taskset -c 15 ./netserver > > taskset -c 0 ./netperf -t UDP_STREAM -l 60 -H 127.0.0.1 -i 50,3 -I 99,5 > > -- -P 12384,12888 -s 32768 -S 32768 -m 1024 > > I cannot reproduce this on a dual socket nehalem system, I get current > -linus to be about 10% faster than .32. Nogo here too, but no nice HW here. -Mike