Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755237AbYBDAct (ORCPT ); Sun, 3 Feb 2008 19:32:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753949AbYBDAcl (ORCPT ); Sun, 3 Feb 2008 19:32:41 -0500 Received: from smtp2.linux-foundation.org ([207.189.120.14]:58817 "EHLO smtp2.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753917AbYBDAck convert rfc822-to-8bit (ORCPT ); Sun, 3 Feb 2008 19:32:40 -0500 Date: Sun, 3 Feb 2008 16:32:55 -0800 From: Andrew Morton To: Toralf =?ISO-8859-1?B?RvZyc3Rlcg==?= Cc: linux-kernel@vger.kernel.org, cpufreq@www.linux.org.uk Subject: Re: (ondemand) CPU governor regression between 2.6.23 and 2.6.24 Message-Id: <20080203163255.467256d4.akpm@linux-foundation.org> In-Reply-To: <200801261506.28544.toralf.foerster@gmx.de> References: <200801261506.28544.toralf.foerster@gmx.de> X-Mailer: Sylpheed 2.4.1 (GTK+ 2.8.17; x86_64-unknown-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 List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1364 Lines: 44 On Sat, 26 Jan 2008 15:06:25 +0100 Toralf F?rster wrote: > I use a 1-liner for a simple performance check : "time factor 819734028463158891" > Here is the result for the new (Gentoo) kernel 2.6.24: > > With the ondemand governor of the I get: > > tfoerste@n22 ~/tmp $ time factor 819734028463158891 > 819734028463158891: 3 273244676154386297 > > real 0m32.997s > user 0m15.732s > sys 0m0.014s > > With the ondemand governor the CPU runs at 600 MHz, > whereas with the performance governor I get : > > tfoerste@n22 ~/tmp $ time factor 819734028463158891 > 819734028463158891: 3 273244676154386297 > > real 0m10.893s > user 0m5.444s > sys 0m0.000s > > (~5.5 sec as I expected) b/c the CPU is set to 1.7 GHz. > > The ondeman governor of previous kernel versions however automatically increased > the CPU speed from 600 MHz to 1.7 GHz. > > My system is a ThinkPad T41, I'll attach the .config > Let's cc the cpufreq list. If nothing happens (often the case), please raise a report at bugzilla.kernel.org so we can track the presence of the regression. Thanks. -- 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/