From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992985AbWJULpp (ORCPT ); Sat, 21 Oct 2006 07:45:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S2992986AbWJULpp (ORCPT ); Sat, 21 Oct 2006 07:45:45 -0400 Received: from [203.26.40.81] ([203.26.40.81]:15263 "EHLO boo.knobbits.org") by vger.kernel.org with ESMTP id S2992985AbWJULpo (ORCPT ); Sat, 21 Oct 2006 07:45:44 -0400 Message-ID: <453A0868.307@knobbits.org> Date: Sat, 21 Oct 2006 21:45:44 +1000 From: "Michael (Micksa) Slade" User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20060216 Debian/1.7.12-1.1ubuntu2 X-Accept-Language: en MIME-Version: 1.0 CC: linux-kernel@vger.kernel.org Subject: Re: Inspiron 6000 and CPU power saving References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit To: unlisted-recipients:; (no To-header on input) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Pallipadi, Venkatesh wrote: > > > > >>-----Original Message----- >>From: linux-kernel-owner@vger.kernel.org >>[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of >>Michael (Micksa) Slade >>Sent: Sunday, October 15, 2006 7:18 PM >>To: linux-kernel@vger.kernel.org >>Subject: Inspiron 6000 and CPU power saving >> >>I recently discovered that my Inspiron 6000 uses about 50% more power >>idling in linux than in windows XP. This means its battery life is >>about 2/3 of what it could/should be. >> >>I guessed it might be the CPU, and did some tests. The >>results strongly >>suggest as much. These are the results I got for power consumption in >>various situations. >> >>linux idle at 800MHz: 27W >>linux idle at 1600MHz: 36W >>linux raytracing at 800: 30W >>linux raytracing at 1600: 42W >> >>windows idle (presumably 800MHz): 16W >>windows raytracing (presumably 1600MHz): 36W >> >>I've tried ubuntu dapper and ubuntu edgy, and RIP 10 (rescue disk) and >>BBC 2.1 (rescue disk), and they all appear to have the same >>issue. The >>machine's BIOS has no APM so I can't try it for comparison. >> >>I've tried noapic and "echo n > >>/sys/module/processor/parameters/max_cstate", where n is 1 thru 4. >>Neither appear to have any affect. >> >>I need help digging deeper. I guess /proc/acpi/processor/CPU0/power >>could give some insight but I'm not sure how to read the >>numbers. That >>and "learn about ACPI" is all I can figure out so far. >> >>So where to from here? I am prepared to spend a significant amount of >>time researching and resolving the issue, so feel free to suggest >>reading the ACPI spec or whatever if that's what it's going to take. >> >>Mick. >> >> >> > >Output of >#cat /proc/acpi/processor/CPU0/power/* >And >#cat /sys/devices/system/cpu/cpu0/cpufreq/* >Will be a good starting point. > >Also, open a issue at bugme.osdl.org. It makes tracking the issues >easier that way. > >Thanks, >Venki > > Done. http://bugzilla.kernel.org/show_bug.cgi?id=7393 As part of this I've also tried vanilla 2.6.19-rc2 and done another small test. See the report. Mick.