From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030229AbVHJUAL (ORCPT ); Wed, 10 Aug 2005 16:00:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030231AbVHJUAK (ORCPT ); Wed, 10 Aug 2005 16:00:10 -0400 Received: from prgy-npn1.prodigy.com ([207.115.54.37]:8979 "EHLO oddball.prodigy.com") by vger.kernel.org with ESMTP id S1030229AbVHJUAJ (ORCPT ); Wed, 10 Aug 2005 16:00:09 -0400 Message-ID: <42FA5DD7.4030901@tmr.com> Date: Wed, 10 Aug 2005 16:04:39 -0400 From: Bill Davidsen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050511 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Jim MacBaine CC: ck@vds.kolivas.org, tony@atomide.com, tuukka.tikkanen@elektrobit.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH] i386 No-Idle-Hz aka Dynamic-Ticks 3 References: <200508031559.24704.kernel@kolivas.org> <200508040716.24346.kernel@kolivas.org> <3afbacad050803152226016790@mail.gmail.com> <200508040852.10224.kernel@kolivas.org> <3afbacad0508032234f9af1f3@mail.gmail.com> <3afbacad05080323596b39e9eb@mail.gmail.com> In-Reply-To: <3afbacad05080323596b39e9eb@mail.gmail.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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. I think it's the other way round, we have the lower power without the higher latency. At least as I can measure... Bravo to all concerned to get this to the testing stage! -- -bill davidsen (davidsen@tmr.com) "The secret to procrastination is to put things off until the last possible moment - but no longer" -me