From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263119AbVG3TxE (ORCPT ); Sat, 30 Jul 2005 15:53:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263124AbVG3TxE (ORCPT ); Sat, 30 Jul 2005 15:53:04 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:44772 "EHLO amd.ucw.cz") by vger.kernel.org with ESMTP id S263119AbVG3Tv2 (ORCPT ); Sat, 30 Jul 2005 15:51:28 -0400 Date: Sat, 30 Jul 2005 21:51:17 +0200 From: Pavel Machek To: Lee Revell Cc: Marc Ballarin , linux-kernel@vger.kernel.org Subject: Re: Power consumption HZ100, HZ250, HZ1000: new numbers Message-ID: <20050730195116.GB9188@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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1122746718.14769.4.camel@mindpipe> 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! > > > What kind of results do you get with a more realistic setup, like > > > running KDE or Gnome OOTB? > > > > > > > Here are results with KDE running. > > > > - no peripherals attached, i.e. truly mobile setup. > > - all modules loaded > > - klaptopdaemon disabled in order to eliminate competition in polling the > > already slow battery controller > > - furthermore, I found that artsd prevents entering C3 and generally > > increases power consumption (ALSA, snd_intel8x0) > > - voltage is 16.5V > > > HZ=100: HZ=1000: DIFF: > > > > 1) averages: > > > > backlight off, arstd off: > > 637.17 679.67 42.5 > > > backlight off, artsd on: > > 799.46 806.13 6.67 > > So it looks like artsd wastes way more power DMAing a bunch of silent > pages to the sound card than HZ=1000. > > There's nothing the ALSA layer can do about this, it's a KDE bug. > > I think this is a good argument for leaving HZ at 1000 until some of > these userspace bugs are fixed. WTF? HZ=1000 eats energy like crazy. artsd eats energy like crazy. And you advocate breaking kernel because artsd is broken?! Pavel -- if you have sharp zaurus hardware you don't need... you know my address