Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758965AbYAPHRU (ORCPT ); Wed, 16 Jan 2008 02:17:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752742AbYAPHRI (ORCPT ); Wed, 16 Jan 2008 02:17:08 -0500 Received: from mga05.intel.com ([192.55.52.89]:8011 "EHLO fmsmga101.fm.intel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752429AbYAPHRG (ORCPT ); Wed, 16 Jan 2008 02:17:06 -0500 X-ExtLoop1: 1 Subject: Re: Netperf TCP_RR(loopback) 10% regression in 2.6.24-rc6, comparing with 2.6.22 From: "Zhang, Yanmin" To: LKML Cc: Ilpo =?ISO-8859-1?Q?J=E4rvinen?= , Netdev , Herbert Xu , Ingo Molnar In-Reply-To: <1200443644.3151.33.camel@ymzhang> References: <1199871330.3298.132.camel@ymzhang> <1200043854.3265.24.camel@ymzhang> <20080114105307.GA22866@gondor.apana.org.au> <1200443644.3151.33.camel@ymzhang> Content-Type: text/plain; charset=utf-8 Date: Wed, 16 Jan 2008 15:15:42 +0800 Message-Id: <1200467742.3151.90.camel@ymzhang> Mime-Version: 1.0 X-Mailer: Evolution 2.9.2 (2.9.2-2.fc7) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2016 Lines: 50 On Wed, 2008-01-16 at 08:34 +0800, Zhang, Yanmin wrote: > On Mon, 2008-01-14 at 21:53 +1100, Herbert Xu wrote: > > On Mon, Jan 14, 2008 at 08:44:40AM +0000, Ilpo Jrvinen wrote: > > > > > > > > I tried to use bisect to locate the bad patch between 2.6.22 and 2.6.23-rc1, > > > > > but the bisected kernel wasn't stable and went crazy. > > > > > > TCP work between that is very much non-existing. > > > > Make sure you haven't switched between SLAB/SLUB while testing this. > I can make sure. In addition, I tried both SLAB and SLUB and make sure the > regression is still there if CONFIG_SLAB=y. I retried bisect between 2.6.22 and 2.6.23-rc1. This time, I enabled CONFIG_SLAB=y, and deleted the warmup procedure in the testing scripts. In addition, bind the 2 processes on the same logical processor. The regression is about 20% which is larger than the one when binding 2 processes to different core. The new bisect reported cfs core patch causes it. The results of every step look stable. dd41f596cda0d7d6e4a8b139ffdfabcefdd46528 is first bad commit commit dd41f596cda0d7d6e4a8b139ffdfabcefdd46528 Author: Ingo Molnar Date: Mon Jul 9 18:51:59 2007 +0200 sched: cfs core code apply the CFS core code. this change switches over the scheduler core to CFS's modular design and makes use of kernel/sched_fair/rt/idletask.c to implement Linux's scheduling policies. thanks to Andrew Morton and Thomas Gleixner for lots of detailed review feedback and for fixlets. Signed-off-by: Ingo Molnar Signed-off-by: Mike Galbraith Signed-off-by: Dmitry Adamushko Signed-off-by: Srivatsa Vaddagiri -yanmin -- 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/