Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S938351AbXHIQX7 (ORCPT ); Thu, 9 Aug 2007 12:23:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S939538AbXHIQXr (ORCPT ); Thu, 9 Aug 2007 12:23:47 -0400 Received: from nf-out-0910.google.com ([64.233.182.188]:56030 "EHLO nf-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S939715AbXHIQXp convert rfc822-to-8bit (ORCPT ); Thu, 9 Aug 2007 12:23:45 -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=cu1T5A/1FOellDqeGXSBLZrsi6PFUH0JWYQ3nxMwiSAo5MqL19WlttgCM3lNWyYplSPTWhVtotWyAAHsiFESsp248tcP5dkKH3RtC5f32xN0xIsXn8l9437IISaDmHT8hHxn8e230xnSZ2hVa1watFNkXTSZpTQk1kv1Vx1RJEE= Date: Thu, 9 Aug 2007 18:22:37 +0200 From: Diego Calleja To: Chuck Ebbert Cc: Lionel Elie Mamane , Ingo Molnar , 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, yingcha@pimp.vs19.net Subject: Re: [PATCH 00/23] per device dirty throttling -v8 Message-Id: <20070809182237.b5afc4c7.diegocg@gmail.com> In-Reply-To: <46BB2C8E.2050205@redhat.com> References: <20070803123712.987126000@chello.nl> <20070804063217.GA25069@elte.hu> <20070804070737.GA940@elte.hu> <20070804103347.GA1956@elte.hu> <20070804163733.GA31001@elte.hu> <20070809062511.GA23435@capsaicin.mamane.lu> <46BB2C8E.2050205@redhat.com> 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: 918 Lines: 20 El Thu, 09 Aug 2007 11:02:38 -0400, Chuck Ebbert escribi?: > NT maintains atimes by default, at least up to XP. You have to edit the > registry to turn them off, and it is a single global switch -- not per > mountpoint like Unix. > > And it makes a huge difference there, too. In windows Vista they've disabled atime updates by default. And XP maintains atimes, but it uses a trick to avoid the performance penalty we suffer in linux, similar to what Andi Kleen suggested: they keep atime updates in memory for one hour, and only sync to disk after that time - of course they also sync it if there's a oportunity to do it, like when updating mtime. - 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/