From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261260AbVGKHp6 (ORCPT ); Mon, 11 Jul 2005 03:45:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261240AbVGKHp6 (ORCPT ); Mon, 11 Jul 2005 03:45:58 -0400 Received: from ecfrec.frec.bull.fr ([129.183.4.8]:31622 "EHLO ecfrec.frec.bull.fr") by vger.kernel.org with ESMTP id S261224AbVGKHpy convert rfc822-to-8bit (ORCPT ); Mon, 11 Jul 2005 03:45:54 -0400 Subject: Re: aio-stress throughput regressions from 2.6.11 to 2.6.12 From: =?ISO-8859-1?Q?S=E9bastien_Dugu=E9?= To: suparna@in.ibm.com Cc: linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20050701075600.GC4625@in.ibm.com> References: <20050701075600.GC4625@in.ibm.com> Date: Mon, 11 Jul 2005 09:43:06 +0200 Message-Id: <1121067786.2196.62.camel@frecb000686> Mime-Version: 1.0 X-Mailer: Evolution 2.0.3 X-MIMETrack: Itemize by SMTP Server on ECN002/FR/BULL(Release 5.0.12 |February 13, 2003) at 11/07/2005 09:55:54, Serialize by Router on ECN002/FR/BULL(Release 5.0.12 |February 13, 2003) at 11/07/2005 09:57:38, Serialize complete at 11/07/2005 09:57:38 Content-Transfer-Encoding: 8BIT Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2005-07-01 at 13:26 +0530, Suparna Bhattacharya wrote: > Has anyone else noticed major throughput regressions for random > reads/writes with aio-stress in 2.6.12 ? > Or have there been any other FS/IO regressions lately ? > > On one test system I see a degradation from around 17+ MB/s to 11MB/s > for random O_DIRECT AIO (aio-stress -o3 testext3/rwfile5) from 2.6.11 > to 2.6.12. It doesn't seem filesystem specific. Not good :( > > BTW, Chris/Ben, it doesn't look like the changes to aio.c have had an impact > (I copied those back to my 2.6.11 tree and tried the runs with no effect) > So it is something else ... > > Ideas/thoughts/observations ? > > Regards > Suparna > I'm too seeing a regression, but between 2.6.10 and 2.6.12 and using sysbench + MySQL (with POSIX AIO). The difference is roughly 8% slower for 2.6.12. I'm currently trying to trace it. aio-stress shows no difference so it probably does not come from kernel AIO. Sébastien. -- ------------------------------------------------------ Sébastien Dugué BULL/FREC:B1-247 phone: (+33) 476 29 77 70 Bullcom: 229-7770 mailto:sebastien.dugue@bull.net Linux POSIX AIO: http://www.bullopensource.org/posix ------------------------------------------------------