Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757429AbYBDRnY (ORCPT ); Mon, 4 Feb 2008 12:43:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752355AbYBDRnQ (ORCPT ); Mon, 4 Feb 2008 12:43:16 -0500 Received: from mga09.intel.com ([134.134.136.24]:53643 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751886AbYBDRnP convert rfc822-to-8bit (ORCPT ); Mon, 4 Feb 2008 12:43:15 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.25,303,1199692800"; d="scan'208";a="295669127" X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8BIT Subject: RE: (ondemand) CPU governor regression between 2.6.23 and 2.6.24 Date: Mon, 4 Feb 2008 09:44:24 -0800 Message-ID: <924EFEDD5F540B4284297C4DC59F3DEE7830C7@orsmsx423.amr.corp.intel.com> In-Reply-To: <20080203163255.467256d4.akpm@linux-foundation.org> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: (ondemand) CPU governor regression between 2.6.23 and 2.6.24 Thread-Index: AchmxdTwADZMi/gIStWR895q+edGnwAj5Jww References: <200801261506.28544.toralf.foerster@gmx.de> <20080203163255.467256d4.akpm@linux-foundation.org> From: "Pallipadi, Venkatesh" To: "Andrew Morton" , =?iso-8859-1?Q?Toralf_F=F6rster?= Cc: , X-OriginalArrivalTime: 04 Feb 2008 17:43:12.0955 (UTC) FILETIME=[6A12B0B0:01C86755] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1788 Lines: 59 >-----Original Message----- >From: linux-kernel-owner@vger.kernel.org >[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Andrew Morton >Sent: Sunday, February 03, 2008 4:33 PM >To: Toralf F?rster >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 > >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 >> > This looks like is related to the report here http://www.ussg.iu.edu/hypermail/linux/kernel/0801.3/1260.html Can you try the workarounds on that thread and see whether the problem goes away. Thanks, Venki -- 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/