Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765038AbXHDQ41 (ORCPT ); Sat, 4 Aug 2007 12:56:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1763769AbXHDQ4U (ORCPT ); Sat, 4 Aug 2007 12:56:20 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:42587 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754124AbXHDQ4T (ORCPT ); Sat, 4 Aug 2007 12:56:19 -0400 Date: Sat, 4 Aug 2007 18:56:04 +0200 From: Ingo Molnar To: Andrew Morton Cc: Linus Torvalds , Peter Zijlstra , linux-mm@kvack.org, linux-kernel@vger.kernel.org, miklos@szeredi.hu, 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: <20070804165604.GA2310@elte.hu> References: <20070803123712.987126000@chello.nl> <20070804063217.GA25069@elte.hu> <20070804070737.GA940@elte.hu> <20070804103347.GA1956@elte.hu> <20070804163733.GA31001@elte.hu> <20070804095143.b8cc2c78.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070804095143.b8cc2c78.akpm@linux-foundation.org> 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=3.0.3 -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: 1301 Lines: 27 * Andrew Morton wrote: > > yeah, it's really ugly. But otherwise i've got no real complaint > > about ext3 - with the obligatory qualification that > > "noatime,nodiratime" in /etc/fstab is a must. This speeds up things > > very visibly - especially when lots of files are accessed. It's kind > > of weird that every Linux desktop and server is hurt by a noticeable > > IO performance slowdown due to the constant atime updates, > > Not just more IO: it will cause great gobs of blockdev pagecache to > remain in memory, too. i tried to convince distro folks about it ... but there's fear, uncertainty and doubt about touching /etc/fstab and i suspect no major distro will do it until another does it - which is a catch-22 :-/ So i guess we should add a kernel config option that allows the kernel rpm maker to just disable atime by default. (re-enableable via boot-line and fstab entry too) [That new kernel config option would be disabled by default.] That makes it much easier to control and introduce. 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/