From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261937AbVHDHQp (ORCPT ); Thu, 4 Aug 2005 03:16:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261940AbVHDHQp (ORCPT ); Thu, 4 Aug 2005 03:16:45 -0400 Received: from mail04.syd.optusnet.com.au ([211.29.132.185]:25006 "EHLO mail04.syd.optusnet.com.au") by vger.kernel.org with ESMTP id S261937AbVHDHQn (ORCPT ); Thu, 4 Aug 2005 03:16:43 -0400 From: Con Kolivas To: Jim MacBaine Subject: Re: [PATCH] i386 No-Idle-Hz aka Dynamic-Ticks 3 Date: Thu, 4 Aug 2005 17:12:31 +1000 User-Agent: KMail/1.8.1 Cc: linux-kernel@vger.kernel.org, ck@vds.kolivas.org, tony@atomide.com, tuukka.tikkanen@elektrobit.com References: <200508031559.24704.kernel@kolivas.org> <3afbacad05080323596b39e9eb@mail.gmail.com> <200508041704.37026.kernel@kolivas.org> In-Reply-To: <200508041704.37026.kernel@kolivas.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200508041712.31972.kernel@kolivas.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 4 Aug 2005 05:04 pm, Con Kolivas wrote: > On Thu, 4 Aug 2005 04:59 pm, Jim MacBaine wrote: > > I just borrowed a power meter to see (or not to see) real effects of > > dyntick. The difference between static 1000 HZ and dynamic HZ is much > > less than I expected, only a very little about noise. With dyntick > > disabled at 1000 HZ my laptop needs 31,3 W. With dyntick enabled I > > get 29.8 W, the pmstats-0.2 script shows me that the system is at > > 35-45 HZ when it is idle. > > > > The power consumption difference between 250 HZ static and dyntick is > > below the noise, so maybe hardly worth all the struggle. > > That's not the point. We want the power savings without sacrificing the > extra ticks if we need them. Oh but thank you very much for confirming the power savings are around the 5% mark. If we don't measure we won't know (and everything else is mental masturbation according to Linus ;)). Cheers, Con