Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964861AbWADUeE (ORCPT ); Wed, 4 Jan 2006 15:34:04 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965231AbWADUeE (ORCPT ); Wed, 4 Jan 2006 15:34:04 -0500 Received: from pentafluge.infradead.org ([213.146.154.40]:21152 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S964861AbWADUeD (ORCPT ); Wed, 4 Jan 2006 15:34:03 -0500 Subject: Re: 2.6.15-ck1 From: Arjan van de Ven To: Dave Jones Cc: Con Kolivas , ck list , linux kernel mailing list In-Reply-To: <20060104195726.GB14782@redhat.com> References: <200601041200.03593.kernel@kolivas.org> <20060104190554.GG10592@redhat.com> <20060104195726.GB14782@redhat.com> Content-Type: text/plain Date: Wed, 04 Jan 2006 21:33:56 +0100 Message-Id: <1136406837.2839.67.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 (2.2.3-2.fc4) Content-Transfer-Encoding: 7bit X-Spam-Score: -2.8 (--) X-Spam-Report: SpamAssassin version 3.0.4 on pentafluge.infradead.org summary: Content analysis details: (-2.8 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.8 ALL_TRUSTED Did not pass through any untrusted hosts X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1753 Lines: 35 On Wed, 2006-01-04 at 14:57 -0500, Dave Jones wrote: > On Wed, Jan 04, 2006 at 02:05:54PM -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. > > Ah interesting. It needs to be totally idle for a period of time before > anything starts to happen at all. After about a minute of doing nothing, > it started to fluctuate once a second 20,21,19,20,19,20,18,21,19,20,22 etc.. sounds like we need some sort of profiler or benchmarker or at least a tool that helps finding out which timers are regularly firing, with the aim at either grouping them or trying to reduce their disturbance in some form. - 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/