Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030285AbWADU4a (ORCPT ); Wed, 4 Jan 2006 15:56:30 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030288AbWADU4a (ORCPT ); Wed, 4 Jan 2006 15:56:30 -0500 Received: from mx1.redhat.com ([66.187.233.31]:3291 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S1030285AbWADU43 (ORCPT ); Wed, 4 Jan 2006 15:56:29 -0500 Date: Wed, 4 Jan 2006 15:56:16 -0500 From: Dave Jones To: gcoady@gmail.com Cc: Con Kolivas , ck list , linux kernel mailing list Subject: Re: 2.6.15-ck1 Message-ID: <20060104205616.GA9754@redhat.com> Mail-Followup-To: Dave Jones , gcoady@gmail.com, Con Kolivas , ck list , linux kernel mailing list References: <200601041200.03593.kernel@kolivas.org> <20060104190554.GG10592@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1566 Lines: 34 On Thu, Jan 05, 2006 at 07:38:29AM +1100, Grant Coady wrote: > On Wed, 4 Jan 2006 14:05:54 -0500, Dave Jones wrote: > > >On Wed, Jan 04, 2006 at 12:00:00PM +1100, Con Kolivas wrote: > > > +2.6.15-dynticks-060101.patch > > > +dynticks-disable_smp_config.patch > > > Latest version of the dynticks patch. This is proving stable and effective on > > > virtually all uniprocessor machines and will benefit systems that desire > > > power savings. SMP kernels (even on UP machines) still misbehave so this > > > config option is not available by default for this stable kernel. > > > >I've been curious for some time if this would actually show any measurable > >power savings. So I hooked up my laptop to a gizmo[1] that shows how much > >power is being sucked. > > > >both before, and after, it shows my laptop when idle is pulling 21W. > >So either the savings here are <1W (My device can't measure more accurately > >than a single watt), or this isn't actually buying us anything at all, or > >something needs tuning. > > Or the laptop was still recharging the battery in both cases? No, I made sure it was fully charged (and the charging light was off) before I started tests. I was tricked by the fact that you have to wait a while before things start happening. Dave - 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/