From: Valerie Clement Subject: Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7 Date: Thu, 19 Apr 2007 15:22:00 +0200 Message-ID: <46276CF8.1030109@bull.net> 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> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: ext4 development , Andrew Morton , Linux Kernel Mailing List To: Jens Axboe Return-path: 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 In-Reply-To: <20070419124630.GD11780@kernel.dk> Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.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=20 >>>> 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 b= it=20 >> better in 2.6.21 than in 2.6.20. >=20 > Wonderful, now try the patch I sent in the next mail and repeat the > test. >=20 That's done too. Now I've got the same results in 2.6.21 as in 2.6.20. Thanks, Val=E9rie