Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759215AbXHENXb (ORCPT ); Sun, 5 Aug 2007 09:23:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751291AbXHENXW (ORCPT ); Sun, 5 Aug 2007 09:23:22 -0400 Received: from ug-out-1314.google.com ([66.249.92.170]:40182 "EHLO ug-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751164AbXHENXU convert rfc822-to-8bit (ORCPT ); Sun, 5 Aug 2007 09:23:20 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:date:from:to:cc:subject:message-id:in-reply-to:references:x-mailer:mime-version:content-type:content-transfer-encoding; b=KCHdx5fm6F0TXqGRwW3RPdi2wLw8iJQQ0gm+DLmvMlSMe25fjbQbXjWU+qKbkhNmCYsMqBu9mGSJC8lCBO6d0BVLbfkqNi1Z50PjViqcL2gF/Kjj7nnIsOnSam+tbPYCv5zsyU6OfZqlUiw0kdI518/jK9GIkdG+OBYJ2B/cXsI= Date: Sun, 5 Aug 2007 15:22:31 +0200 From: Diego Calleja To: Ingo Molnar 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: <20070805152231.aba9428a.diegocg@gmail.com> In-Reply-To: <20070805071320.GC515@elte.hu> References: <20070804103347.GA1956@elte.hu> <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> X-Mailer: Sylpheed 2.4.4 (GTK+ 2.11.6; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1077 Lines: 22 El Sun, 5 Aug 2007 09:13:20 +0200, Ingo Molnar escribi?: > 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.... "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." I bet that some people would consider such performance hit a bug... - 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/