Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1031663AbXEAMD2 (ORCPT ); Tue, 1 May 2007 08:03:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1031679AbXEAMD2 (ORCPT ); Tue, 1 May 2007 08:03:28 -0400 Received: from sceptre.pobox.com ([207.106.133.20]:51786 "EHLO sceptre.pobox.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1031663AbXEAMD1 (ORCPT ); Tue, 1 May 2007 08:03:27 -0400 Message-ID: <46372C8B.7090901@hp.com> Date: Tue, 01 May 2007 08:03:23 -0400 From: "Alan D. Brunelle" Reply-To: Alan.Brunelle@hp.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: CFQ IO scheduler patch series - AIM7 DBase results on a 16-way IA64 References: <4635D59C.4050300@hp.com> <20070430122753.GL21015@kernel.dk> In-Reply-To: <20070430122753.GL21015@kernel.dk> 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 Content-Length: 1457 Lines: 34 Jens Axboe wrote: > On Mon, Apr 30 2007, Alan D. Brunelle wrote: >> The results from a single run of an AIM7 DBase load on a 16-way ia64 box >> (64GB RAM + 144 FC disks) showed a slight regression (~0.5%) by adding >> in this patch. (Graph can be found at >> http://free.linux.hp.com/~adb/cfq/cfq_dbase.png ) It is only a single >> set of runs, on a single platform, but it is something to keep an eye on >> as the regression showed itself across the complete run. > > Do you know if this regression is due to worse IO performance, or > increased system CPU usage? We performed two point runs yesterday (20,000 and 50,000 tasks) and here are the results: Kernel Tasks Jobs per Minute %sys (avg) ------ ----- --------------- ---------- 2.6.21 20000 60,831.1 39.83% CFQ br 20000 60,237.4 40.80% -0.98% +2.44% 2.6.21 50000 60,881.6 40.43% CFQ br 50000 60,400.6 40.80% -0.79% +0.92% So we're seeing a slight IO performance regression with a slight increase in %system with the CFQ branch. (A chart of the complete run values is up on http://free.linux.hp.com/~adb/cfq/cfq_20k50k.png ). Alan - 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/