From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261152AbVGYOOE (ORCPT ); Mon, 25 Jul 2005 10:14:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261227AbVGYOOE (ORCPT ); Mon, 25 Jul 2005 10:14:04 -0400 Received: from imap.gmx.net ([213.165.64.20]:30423 "HELO mail.gmx.net") by vger.kernel.org with SMTP id S261152AbVGYOOD (ORCPT ); Mon, 25 Jul 2005 10:14:03 -0400 X-Authenticated: #1725425 Date: Mon, 25 Jul 2005 16:13:33 +0200 From: Marc Ballarin To: linux-kernel@vger.kernel.org Subject: Power consumption HZ250 vs. HZ1000 Message-Id: <20050725161333.446fe265.Ballarin.Marc@gmx.de> X-Mailer: Sylpheed version 2.0.0rc (GTK+ 2.6.7; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, I did some measurements in order to compare power drain with HZ250 and HZ1000. To measure the actual drain, I used the "smart" battery's internal measurement. (Available with acpi-sbs in /proc/acpi/sbs/SBS0/SB0/state.) No clue how accurate this is. Here some battery details, in case someone knows: charge reporting error: 25% SB specification: v1.1 (with PEC) manufacturer name: Panasonic manufacture date: 2004-11-27 device name: 02ZL device chemistry: Lion Kernel: 2.6.13-rc3-mm1 + acpi-sbs CPU: cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 1.60GHz stepping : 6 The "ondemand" governor was running, using acpi_cpufreq. (Idle at 600MHz). Systems was running X11/KDE to get a more or less realistic scenario. No cron jobs, network traffic or additional applications. WLAN and built-in display were disabled completely, all fans and LEDs were off, internal hard disc was running. Additional peripherals: external keyboard, mouse, display and externally-powered hard disk (USB). The results are quite simple: In both configurations the current settles between 727-729 mA (Voltage ~16.5 V). Some issues: - C-states look strange: active state: C2 max_cstate: C8 bus master activity: 00887fff states: C1: type[C1] promotion[C2] demotion[--] latency[000] usage[00000010] *C2: type[C2] promotion[C3] demotion[C1] latency[001] usage[01367471] C3: type[C3] promotion[--] demotion[C2] latency[085] usage[00000000] - I don't know, how much polling of the battery affects results. Reads always block for ~10 seconds, and I used this behaviour for rate-limiting. - Is this approach valid at all? - I could repeat the test in single user mode with internal hard disc turned off. Regards