Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758430Ab0G3CU7 (ORCPT ); Thu, 29 Jul 2010 22:20:59 -0400 Received: from thunk.org ([69.25.196.29]:42379 "EHLO thunker.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754953Ab0G3CU6 (ORCPT ); Thu, 29 Jul 2010 22:20:58 -0400 Date: Thu, 29 Jul 2010 22:20:55 -0400 From: "Ted Ts'o" To: Kay Diederichs Cc: linux , Ext4 Developers List , Karsten Schaefer Subject: Re: ext4 performance regression 2.6.27-stable versus 2.6.32 and later Message-ID: <20100730022055.GL4506@thunk.org> Mail-Followup-To: Ted Ts'o , Kay Diederichs , linux , Ext4 Developers List , Karsten Schaefer References: <4C508A54.7070002@uni-konstanz.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4C508A54.7070002@uni-konstanz.de> User-Agent: Mutt/1.5.20 (2009-06-14) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: tytso@thunk.org X-SA-Exim-Scanned: No (on thunker.thunk.org); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 865 Lines: 23 On Wed, Jul 28, 2010 at 09:51:48PM +0200, Kay Diederichs wrote: > > When looking at the I/O statistics while the benchmark is running, we > see very choppy patterns for 2.6.32, but quite smooth stats for > 2.6.27-stable. Could you try to do two things for me? Using (preferably from a recent e2fsprogs, such as 1.41.11 or 12) run filefrag -v on the files created from your 2.6.27 run and your 2.6.32 run? Secondly can capture blktrace results from 2.6.27 and 2.6.32? That would be very helpful to understand what might be going on. Either would be helpful; both would be greatly appreciated. Thanks, - Ted -- 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/