From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1766659AbXDSNWu (ORCPT ); Thu, 19 Apr 2007 09:22:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1766692AbXDSNWu (ORCPT ); Thu, 19 Apr 2007 09:22:50 -0400 Received: from ecfrec.frec.bull.fr ([129.183.4.8]:57309 "EHLO ecfrec.frec.bull.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1766659AbXDSNWt (ORCPT ); Thu, 19 Apr 2007 09:22:49 -0400 Message-ID: <46276CF8.1030109@bull.net> Date: Thu, 19 Apr 2007 15:22:00 +0200 From: Valerie Clement User-Agent: Thunderbird 1.5.0.4 (Windows/20060516) MIME-Version: 1.0 To: Jens Axboe Cc: ext4 development , Andrew Morton , Linux Kernel Mailing List Subject: Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7 References: <462622F8.10107@bull.net> <20070419090346.GE20928@kernel.dk> <462736FC.3090902@bull.net> <20070419115840.GA11780@kernel.dk> <4627644E.7010002@bull.net> <20070419124630.GD11780@kernel.dk> In-Reply-To: <20070419124630.GD11780@kernel.dk> X-MIMETrack: Itemize by SMTP Server on ECN002/FR/BULL(Release 5.0.12 |February 13, 2003) at 19/04/2007 15:25:24, Serialize by Router on ECN002/FR/BULL(Release 5.0.12 |February 13, 2003) at 19/04/2007 15:25:26, Serialize complete at 19/04/2007 15:25:26 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jens Axboe wrote: > On Thu, Apr 19 2007, Valerie Clement wrote: >> Jens Axboe wrote: >>> On Thu, Apr 19 2007, Valerie Clement wrote: >>>> Jens Axboe wrote: >>>>> Please tell me how you are running ffsb, and also please include a >>>>> dmessg from a booted system. >>>>> >>>> Hi, >>>> our mails crossed! please see my response to Andrew. >>>> You could reproduce the problem with dd command as suggested, it's more >>>> easy. >>>> I'm sending you the dmesg info. For my tests I used the scsci sdc device. >>> Thanks, it does. Can you try one thing for me? If you run the test on >>> sdc, try doing: >>> >>> # echo 64 > /sys/block/sdc/queue/iosched/quantum >>> >>> and repeat the test. >>> >> OK, that's done. >> >> With the change of quantum, the throughput scores are now a little bit >> better in 2.6.21 than in 2.6.20. > > Wonderful, now try the patch I sent in the next mail and repeat the > test. > That's done too. Now I've got the same results in 2.6.21 as in 2.6.20. Thanks, Valérie