From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265134AbUELRQM (ORCPT ); Wed, 12 May 2004 13:16:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265136AbUELRQM (ORCPT ); Wed, 12 May 2004 13:16:12 -0400 Received: from natnoddy.rzone.de ([81.169.145.166]:28584 "EHLO natnoddy.rzone.de") by vger.kernel.org with ESMTP id S265134AbUELRQJ (ORCPT ); Wed, 12 May 2004 13:16:09 -0400 Date: Wed, 12 May 2004 19:14:33 +0200 From: Dominik Brodowski To: linux-kernel@vger.kernel.org, moqua@kurtenba.ch Subject: Re: cpufreq and p4 prescott Message-ID: <20040512171433.GA10481@dominikbrodowski.de> Mail-Followup-To: Dominik Brodowski , linux-kernel@vger.kernel.org, moqua@kurtenba.ch Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.6i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > i have problems scaling down my p4 prescott 2.8 GHz. You can't scale a prescott, you can only throttle it. > [ck@holodeck:cpufreq] cat /proc/cpuinfo | grep Mhz > cpu MHz : 2807.131 > cpu MHz : 2807.131 The cpu MHz entry in /proc/cpuinfo is the same for all CPUs, and no reliable source to detect the current cpu frequency anyway. Use /sys/devices/system/cpu/cpu0/scaling_cur_freq or even cpuinfo_cur_freq for that.[*] So p4-clockmod-throttling does work on your p4 prescott. Dominik [*] Available in 2.6.7, hopefully, if Linus merges the latest cpufreq-bk tree from Dave. It'll be in the next -mm release, though.