From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754508Ab0IVMKY (ORCPT ); Wed, 22 Sep 2010 08:10:24 -0400 Received: from mail-ww0-f44.google.com ([74.125.82.44]:59881 "EHLO mail-ww0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752425Ab0IVMKX convert rfc822-to-8bit (ORCPT ); Wed, 22 Sep 2010 08:10:23 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:reply-to:to:subject:date:user-agent:cc:references:in-reply-to :mime-version:content-type:content-transfer-encoding:message-id; b=Tsd8vosqn7/xw5B2oA+nEH8093SK6bi1OZeJuujYfv/ev+PPgH5dU3wgsQxD8Wq4qj k/FLBpP1jg2PBBThahqV6f68ouPKVzD4Dh3zVqEP/tUDXcpfXFOzwi/Gi/VaMw/wlOnJ GBm1ZtJOfuc+eOGWT6qD5Z8ibjU4/bmYdsGrc= From: Diego Calleja Reply-To: diegocg@gmail.com To: Juan PC Subject: Re: CFQ I/O scheduler better than AS? Date: Wed, 22 Sep 2010 14:10:16 +0200 User-Agent: KMail/1.13.5 (Linux/2.6.36-rc4-00040-gbfa88ea; KDE/4.5.1; x86_64; ; ) Cc: linux-kernel@vger.kernel.org References: <1285152908.10774.306.camel@albahaca.inf.um.es> In-Reply-To: <1285152908.10774.306.camel@albahaca.inf.um.es> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 8BIT Message-Id: <201009221410.17056.diegocg@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Miércoles, 22 de Septiembre de 2010 12:55:08 Juan PC escribió: > Hi: > > I am sure that, for most people, the clear answer is "yes" (after all, > CFQ is the default I/O scheduler in Linux), but we are having serious > difficulties to find a benchmark which shows that CFQ is undoubtedly > better than AS. The AS io scheduler was removed in 2.6.33 (7 months ago, in commit 492af6350a5ccf087e4964104a276ed358811458), so you must be running benchmarks in old kernels. The CFQ scheduler used in recent kernels should have good performance (if it doesn't, you probably should write a bug report ccing jens.axboe@oracle.com) Saludos ;)