Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763169AbXHFG7X (ORCPT ); Mon, 6 Aug 2007 02:59:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758755AbXHFG6z (ORCPT ); Mon, 6 Aug 2007 02:58:55 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:49896 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758311AbXHFG6x (ORCPT ); Mon, 6 Aug 2007 02:58:53 -0400 Date: Mon, 6 Aug 2007 08:58:34 +0200 From: Ingo Molnar To: Diego Calleja Cc: Alan Cox , J??rn Engel , Jeff Garzik , Linus Torvalds , Peter Zijlstra , linux-mm@kvack.org, Linux Kernel Mailing List , 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, david@lang.hm Subject: Re: [PATCH 00/23] per device dirty throttling -v8 Message-ID: <20070806065834.GB2818@elte.hu> References: <20070804163733.GA31001@elte.hu> <46B4C0A8.1000902@garzik.org> <20070804191205.GA24723@lazybastard.org> <20070804192130.GA25346@elte.hu> <20070804211156.5f600d80@the-village.bc.nu> <20070804202830.GA4538@elte.hu> <20070804224834.5187f9b7@the-village.bc.nu> <20070805071320.GC515@elte.hu> <20070805152231.aba9428a.diegocg@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070805152231.aba9428a.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=3.0.3 -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: 1198 Lines: 32 * Diego Calleja wrote: > > Measurements show that noatime helps 20-30% on regular desktop > > workloads, easily 50% for kernel builds and much more than that (in > > excess of 100%) for file-read-intense workloads. We cannot just walk > > And as everybody knows in servers is a popular practice to disable it. > According to an interview to the kernel.org admins.... yeah - but i'd be surprised if more than 1% of all Linux servers out there had noatime. > "Beyond that, Peter noted, "very little fancy is going on, and that is > good because fancy is hard to maintain." He explained that the only > fancy thing being done is that all filesystems are mounted noatime > meaning that the system doesn't have to make writes to the filesystem > for files which are simply being read, "that cut the load average in > half." nice quote :-) > I bet that some people would consider such performance hit a bug... yeah. 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/