Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932456AbXHDRSA (ORCPT ); Sat, 4 Aug 2007 13:18:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932798AbXHDRRp (ORCPT ); Sat, 4 Aug 2007 13:17:45 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:56772 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932757AbXHDRRn (ORCPT ); Sat, 4 Aug 2007 13:17:43 -0400 Date: Sat, 4 Aug 2007 19:17:24 +0200 From: Ingo Molnar To: Diego Calleja Cc: Linus Torvalds , Peter Zijlstra , linux-mm@kvack.org, linux-kernel@vger.kernel.org, miklos@szeredi.hu, akpm@linux-foundation.org, neilb@suse.de, dgc@sgi.com, tomoki.sekiyama.qu@hitachi.com, nikita@clusterfs.com, trond.myklebust@fys.uio.no, yingchao.zhou@gmail.com, richard@rsk.demon.co.uk Subject: Re: [PATCH 00/23] per device dirty throttling -v8 Message-ID: <20070804171724.GA4740@elte.hu> References: <20070803123712.987126000@chello.nl> <20070804063217.GA25069@elte.hu> <20070804070737.GA940@elte.hu> <20070804103347.GA1956@elte.hu> <20070804163733.GA31001@elte.hu> <20070804190210.8b1530dd.diegocg@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20070804190210.8b1530dd.diegocg@gmail.com> User-Agent: Mutt/1.5.14 (2007-02-12) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.1.7-deb -1.0 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1190 Lines: 31 * Diego Calleja wrote: > El Sat, 4 Aug 2007 18:37:33 +0200, Ingo Molnar escribi?: > > > thousands of applications. So for most file workloads we give > > Windows a 20%-30% performance edge, for almost nothing. (for > > RAM-starved kernel builds the performance difference between atime > > and noatime+nodiratime setups is more on the order of 40%) > > Just curious - do you have numbers with relatime? nope. Stupid question, i just tried it and got this: EXT3-fs: Unrecognized mount option "relatime" or missing value i've got util-linux-2.13-0.46.fc6 and 2.6.22 on that box, shouldnt that be recent enough? As far as i can see it from the kernel-side code, this works on the general VFS level and hence should be supported by ext3 already. even relatime means one extra write IO after a file has been created, but at least for read-mostly files it avoids the continuous atime update. Ingo - 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/