From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262327AbVGGUMl (ORCPT ); Thu, 7 Jul 2005 16:12:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261486AbVGGUMb (ORCPT ); Thu, 7 Jul 2005 16:12:31 -0400 Received: from mx1.redhat.com ([66.187.233.31]:63185 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S262349AbVGGUHB (ORCPT ); Thu, 7 Jul 2005 16:07:01 -0400 Date: Thu, 7 Jul 2005 16:06:48 -0400 From: Dave Jones To: st3@riseup.net Cc: linux-kernel@vger.kernel.org, cpufreq@lists.linux.org.uk Subject: Re: enhanced intel speedstep feature was Re: speedstep-centrino on dothan Message-ID: <20050707200648.GA29142@redhat.com> Mail-Followup-To: Dave Jones , st3@riseup.net, linux-kernel@vger.kernel.org, cpufreq@lists.linux.org.uk References: <20050706112202.33d63d4d@horst.morte.male> <42CC37FD.5040708@tmr.com> <20050706211159.GF27630@redhat.com> <20050706235557.0c122d33@horst.morte.male> <20050707220027.413343d4@horst.morte.male> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050707220027.413343d4@horst.morte.male> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 07, 2005 at 10:00:27PM +0200, st3@riseup.net wrote: > Enabling, say, a duty cycle of 12.5% means that the CPU chip will be driven > by clock just one time every eight, thus reducing power consumption and > temperature (and it speeds down dramatically the CPU, too =). > > I tested it so far on my Pentium M Dothan 715 and on a Dothan 725. > > What do you think, could this be useful? I could provide a patch or a > stand-alone module. Should I write an interface to sysfs? You just reinvented the p4-clockmod driver :-) This hasn't been seen to save any power whatsoever that I've seen. I've heard a few reports that it reduces heat for a few folks, but betting on it increasing your battery life is probably a push. Dave