From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754637AbXGGKG6 (ORCPT ); Sat, 7 Jul 2007 06:06:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752404AbXGGKGv (ORCPT ); Sat, 7 Jul 2007 06:06:51 -0400 Received: from smtp01.cdmon.com ([86.109.99.230]:54010 "EHLO smtp01.cdmon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752312AbXGGKGu (ORCPT ); Sat, 7 Jul 2007 06:06:50 -0400 Date: Sat, 7 Jul 2007 12:06:49 +0200 From: DervishD To: Arjan van de Ven Cc: Jan Engelhardt , Linux-kernel Subject: Re: Question about cpufreq governors Message-ID: <20070707100649.GB19299@DervishD> Mail-Followup-To: Arjan van de Ven , Jan Engelhardt , Linux-kernel References: <20070706205045.GA2778@DervishD> <1183762229.2774.1.camel@laptopd505.fenrus.org> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1183762229.2774.1.camel@laptopd505.fenrus.org> User-Agent: Mutt/1.4.2.3i Organization: DervishD Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi Arjan :) * Arjan van de Ven dixit: > On Fri, 2007-07-06 at 23:54 +0200, Jan Engelhardt wrote: > > On Jul 6 2007 22:50, DervishD wrote: > > > > > > What I want to know is if I can choose "ondemand" governor instead > > >of the recommended for AMD64, namely the "conservative" governor, since > > >I will be switching between those two frequencies. I haven't found any > > >information about my CPU regarding latency when switching between > > >frequencies, so I don't know if I will be gaining anything using the > > >"conservative" governor. > > > > > > Which governor is better suited for a CPU with only two fid's, > > >"ondemand" or "conservative"? > > > > Depends on what you want. ondemand instantly switches when there is > > something/nothing to do, while conservative uses a threshold (modeled upon > > latency). > > for power saving, the ondemand behavior is better in general. However if > you have a cpu that switches frequency very slowly, you may be better to > not go as high quickly because going back down is then burning more > power than needed potentially... That's the problem: I want to use "ondemand" but I don't know if it will work properly with my CPU because I don't know if my CPU switches frequency fast or slow :( I can find that information, although the Kconfig file for cpufreq says that AMD64 has latency problems (but I can confirm that, I'm afraid). Thanks for your answer :) Raúl Núñez de Arenas Coronado -- Linux Registered User 88736 | http://www.dervishd.net It's my PC and I'll cry if I want to... RAmen!