From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261614AbVGPNvl (ORCPT ); Sat, 16 Jul 2005 09:51:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261622AbVGPNvk (ORCPT ); Sat, 16 Jul 2005 09:51:40 -0400 Received: from cpu2485.adsl.bellglobal.com ([207.236.16.208]:53483 "EHLO amd.ucw.cz") by vger.kernel.org with ESMTP id S261614AbVGPNvI (ORCPT ); Sat, 16 Jul 2005 09:51:08 -0400 Date: Fri, 15 Jul 2005 17:41:34 +0200 From: Pavel Machek To: Andrew Morton Cc: Lee Revell , "Brown, Len" , dtor_core@ameritech.net, torvalds@osdl.org, vojtech@suse.cz, david.lang@digitalinsight.com, davidsen@tmr.com, kernel@kolivas.org, linux-kernel@vger.kernel.org, mbligh@mbligh.org, diegocg@gmail.com, azarah@nosferatu.za.org, cw@f00f.org, christoph@lameter.com Subject: Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt Message-ID: <20050715154134.GA1776@elf.ucw.cz> References: <42D3E852.5060704@mvista.com> <20050712162740.GA8938@ucw.cz> <42D540C2.9060201@tmr.com> <20050713184227.GB2072@ucw.cz> <1121282025.4435.70.camel@mindpipe> <1121286258.4435.98.camel@mindpipe> <20050713134857.354e697c.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050713134857.354e697c.akpm@osdl.org> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > > Alan tested it and said that 250HZ does not save much power anyway. > > Len Brown, a year ago: "The bottom line number to laptop users is battery > lifetime. Just today somebody complained to me that Windows gets twice the > battery life that Linux does." > > And "Maybe I can get Andy Grover over in the moble lab to get some time on > that fancy power measurement setup they have... > > "My expectation is if we want to beat the competition, we'll want the > ability to go *under* 100Hz." > > But then, power consumption of the display should preponderate, so it's not > clear. > > Len, any updates on the relationship between HZ and power consumption? Last time I checked, HZ=100 to HZ=1000 difference was about 1W, about twice as much as disk spinning up vs. disk spinned down. Pavel -- teflon -- maybe it is a trademark, but it should not be.