From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262051AbVGaWnn (ORCPT ); Sun, 31 Jul 2005 18:43:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262017AbVGaWlH (ORCPT ); Sun, 31 Jul 2005 18:41:07 -0400 Received: from viper.oldcity.dca.net ([216.158.38.4]:14739 "HELO viper.oldcity.dca.net") by vger.kernel.org with SMTP id S262028AbVGaWjX (ORCPT ); Sun, 31 Jul 2005 18:39:23 -0400 Subject: Re: Power consumption HZ100, HZ250, HZ1000: new numbers From: Lee Revell To: Pavel Machek Cc: James Bruce , Marc Ballarin , linux-kernel@vger.kernel.org In-Reply-To: <20050731223616.GB27580@elf.ucw.cz> References: <20050730004924.087a7630.Ballarin.Marc@gmx.de> <1122678943.9381.44.camel@mindpipe> <20050730120645.77a33a34.Ballarin.Marc@gmx.de> <1122746718.14769.4.camel@mindpipe> <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> <20050731220754.GE7362@voodoo> <20050731223616.GB27580@elf.ucw.cz> Content-Type: text/plain Date: Sun, 31 Jul 2005 18:39:21 -0400 Message-Id: <1122849562.13000.23.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Evolution 2.2.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2005-08-01 at 00:36 +0200, Pavel Machek wrote: > Hi! > > > > > I really like having 250HZ as an _option_, but what I don't see is why > > > > it should be the _default_. I believe this is Lee's position as > > > > Last I checked, ACPI and CPU speed scaling were not enabled by default; > > > > > > Kernel defaults are irelevant; distros change them anyway. [But we > > > probably want to enable ACPI and cpufreq by default, because that > > > matches what 99% of users will use.] > > > > > > > If the kernel defaults are irrelevant, then it would make more sense to > > leave the default HZ as 1000 and not to enable the cpufreq and ACPI in > > order to keep with the principle of least surprise for people who do use > > kernel.org kernels. > > Well, I'd say you want ACPI enabled. New machine do not even boot > without that. Default config should be usefull; set ACPI off, and > you'll not be able to even power machine down. While it's good to be future proof, I don't think it's valid to assume that new kernels usually run on new hardware. Lee