From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261518AbVHBNL2 (ORCPT ); Tue, 2 Aug 2005 09:11:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261510AbVHBNL1 (ORCPT ); Tue, 2 Aug 2005 09:11:27 -0400 Received: from pop-canoe.atl.sa.earthlink.net ([207.69.195.66]:40911 "EHLO pop-canoe.atl.sa.earthlink.net") by vger.kernel.org with ESMTP id S261509AbVHBNKq (ORCPT ); Tue, 2 Aug 2005 09:10:46 -0400 Message-ID: <42EF70BD.7070804@earthlink.net> Date: Tue, 02 Aug 2005 09:10:21 -0400 From: Stephen Clark Reply-To: sclark46@earthlink.net User-Agent: Mozilla/5.0 (X11; U; Linux 2.2.16-22smp i686; en-US; m18) Gecko/20010110 Netscape6/6.5 X-Accept-Language: en-us, en MIME-Version: 1.0 To: James Bruce CC: "Theodore Ts'o" , David Weinehall , Lee Revell , Pavel Machek , Marc Ballarin , linux-kernel@vger.kernel.org Subject: Re: Power consumption HZ100, HZ250, HZ1000: new numbers References: <20050730195116.GB9188@elf.ucw.cz> <1122753864.14769.18.camel@mindpipe> <20050730201049.GE2093@elf.ucw.cz> <42ED32D3.9070208@andrew.cmu.edu> <20050731211020.GB27433@elf.ucw.cz> <42ED4CCF.6020803@andrew.cmu.edu> <20050731224752.GC27580@elf.ucw.cz> <1122852234.13000.27.camel@mindpipe> <20050801074447.GJ9841@khan.acc.umu.se> <42EE4B4A.80602@andrew.cmu.edu> <20050801204245.GC17258@thunk.org> <42EEFB9B.10508@andrew.cmu.edu> In-Reply-To: <42EEFB9B.10508@andrew.cmu.edu> 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 James Bruce wrote: >Theodore Ts'o wrote: > > On Mon, Aug 01, 2005 at 12:18:18PM -0400, James Bruce wrote: > >>The tradeoff is a realistic 4.4% power savings vs a 300% increase in > >>the minimum sleep period. A user will see zero power savings if they > >>have a USB mouse (probably 99% of desktops). On top of that, we can > ^^^^^^^^ > > > Most laptops (including mine, a Thinkpad T40) use a PS/2 mouse. So in > > the places where power consumption savins matters most, it's usually > > quite possible to function without needing any USB devices. The 90% > > figure isn't at all right; in fact, it may be that over 90% of the > > laptops still use PS/2 mice and keyboards. > >Yes, laptops are mostly PS/2, which is why I only claimed a statistic >for desktops. Desktops pretty much all use USB mice now. If 250Hz were >only being sold as an option for laptops, we could leave it at that, yet >its being pushed as a default that's "good for everyone". For desktops >this is not currently true at all. By the time USB is fixed to do power >saving, we'll probably have a working tick-skipping patch which makes >the whole HZ argument moot. > > - Jim Bruce > > > Maybe new desktop systems - but what about the tens of millions of old systems that don't. Steve