From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965589AbXDYO4R (ORCPT ); Wed, 25 Apr 2007 10:56:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965620AbXDYO4R (ORCPT ); Wed, 25 Apr 2007 10:56:17 -0400 Received: from gretel.pobox.com ([208.58.1.197]:60117 "EHLO gretel.pobox.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965589AbXDYO4Q (ORCPT ); Wed, 25 Apr 2007 10:56:16 -0400 X-Greylist: delayed 753 seconds by postgrey-1.27 at vger.kernel.org; Wed, 25 Apr 2007 10:56:16 EDT Message-ID: <462F68BF.5000805@hp.com> Date: Wed, 25 Apr 2007 10:42:07 -0400 From: "Alan D. Brunelle" Reply-To: Alan.Brunelle@pobox.com User-Agent: Thunderbird 1.5.0.10 (X11/20070403) MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Cc: Jens Axboe Subject: Re: [PATCH 0/15] CFQ IO scheduler patch series References: <11774025432481-git-send-email-jens.axboe@oracle.com> In-Reply-To: <11774025432481-git-send-email-jens.axboe@oracle.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Using the patches posted yesterday (http://marc.info/?l=linux-kernel&m=117740312628325&w=2) here are some quick read results (as measured by iostat over a 5 minute period, taken in 6 second intervals) on a 4-way IA64 box with 42 disks (24 FC and 18 U320), 42 processes (1 per disk) with 256 AIOs (16KB) outstanding at all times per device: 2.6.21-rc7: 1,006.023 MB/second 2.6.21-rc7 + new CFQ IO scheduler: 1,030.767 MB/second showing about a 2.46% performance improvement with a 2.43% increase in %system used (3.738% -> 3.829%). Interestingly enough this patch also seems to remove some noise during the run - see the chart at http://free.linux.hp.com/~adb/cfq/rkb_s.png Alan D. Brunelle HP / Open Source and Linux Organization / Scalability and Performance Group