From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262231AbVHCN6J (ORCPT ); Wed, 3 Aug 2005 09:58:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262158AbVHCN5p (ORCPT ); Wed, 3 Aug 2005 09:57:45 -0400 Received: from rproxy.gmail.com ([64.233.170.197]:48403 "EHLO rproxy.gmail.com") by vger.kernel.org with ESMTP id S262137AbVHCN5N convert rfc822-to-8bit (ORCPT ); Wed, 3 Aug 2005 09:57:13 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=o00D0+NKihcTPpYr8v8Zd+vC5BkN/IByoGQEEowUugRrIKDByhyITOSFVhUnpBXir7b3ql0xYoSCbDnCjrJz/Yp51N/cVHGweK9IO/SAZSplVH+IxVhZh6wOm5W45UCzerNJkqArZbdsb3LTvYVrEDyE9Oo5qfJ+8+vqt7Oesp0= Message-ID: Date: Wed, 3 Aug 2005 08:57:12 -0500 From: Dmitry Torokhov Reply-To: dtor_core@ameritech.net To: Hans Kristian Rosbach Subject: Re: Power consumption HZ100, HZ250, HZ1000: new numbers Cc: James Bruce , "Theodore Ts'o" , David Weinehall , Lee Revell , Pavel Machek , Marc Ballarin , linux-kernel@vger.kernel.org In-Reply-To: <1123060790.29553.7.camel@linux> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Content-Disposition: inline References: <20050730195116.GB9188@elf.ucw.cz> <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> <1123060790.29553.7.camel@linux> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On 8/3/05, Hans Kristian Rosbach wrote: > On Tue, 2005-08-02 at 00:50 -0400, 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. > > Most new laptops are moving away from PS/2 ports, for example my > shining (literally) new Acer Ferrari 4005 only has USB2 ports for mice > and keyboard inputs (unless in the optional pcie docking station maybe). > So my suggestion would be to fix USB power management. > You are talking about external ports. I am pretty sure that installed keyboard and touchpad (or whattever pointing device it has) are plain old PS/2. -- Dmitry