From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753155Ab0AYOD6 (ORCPT ); Mon, 25 Jan 2010 09:03:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752769Ab0AYOD5 (ORCPT ); Mon, 25 Jan 2010 09:03:57 -0500 Received: from casper.infradead.org ([85.118.1.10]:40318 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752576Ab0AYOD5 (ORCPT ); Mon, 25 Jan 2010 09:03:57 -0500 Subject: Re: netperf ~50% regression with 2.6.33-rc1, bisect to 1b9508f From: Peter Zijlstra To: Lin Ming Cc: Mike Galbraith , Ingo Molnar , "Zhang, Yanmin" , lkml In-Reply-To: <1264413826.3642.88.camel@minggr.sh.intel.com> References: <1264413826.3642.88.camel@minggr.sh.intel.com> Content-Type: text/plain; charset="UTF-8" Date: Mon, 25 Jan 2010 15:03:49 +0100 Message-ID: <1264428229.4283.1833.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. (Had to drop the -i -I thingies, otherwise this took ages)