From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263087AbVG3SGN (ORCPT ); Sat, 30 Jul 2005 14:06:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263095AbVG3SGN (ORCPT ); Sat, 30 Jul 2005 14:06:13 -0400 Received: from mustang.oldcity.dca.net ([216.158.38.3]:9379 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S263092AbVG3SFT (ORCPT ); Sat, 30 Jul 2005 14:05:19 -0400 Subject: Re: Power consumption HZ100, HZ250, HZ1000: new numbers From: Lee Revell To: Marc Ballarin Cc: linux-kernel@vger.kernel.org In-Reply-To: <20050730120645.77a33a34.Ballarin.Marc@gmx.de> References: <20050730004924.087a7630.Ballarin.Marc@gmx.de> <1122678943.9381.44.camel@mindpipe> <20050730120645.77a33a34.Ballarin.Marc@gmx.de> Content-Type: text/plain Date: Sat, 30 Jul 2005 14:05:17 -0400 Message-Id: <1122746718.14769.4.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 Sat, 2005-07-30 at 12:06 +0200, Marc Ballarin wrote: > On Fri, 29 Jul 2005 19:15:42 -0400 > Lee Revell wrote: > > > > > 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. Lee