From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261214AbVG0XSf (ORCPT ); Wed, 27 Jul 2005 19:18:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261160AbVG0XSa (ORCPT ); Wed, 27 Jul 2005 19:18:30 -0400 Received: from smtp.osdl.org ([65.172.181.4]:58823 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S261214AbVG0XRU (ORCPT ); Wed, 27 Jul 2005 19:17:20 -0400 Date: Wed, 27 Jul 2005 16:16:05 -0700 From: Andrew Morton To: Florian Engelhardt Cc: linux-kernel@vger.kernel.org, acpi-devel@lists.sourceforge.net Subject: Re: system freezes for 0.2 to 0.5 seconds when reading /proc/acpi/thermal_zone/THRM/temperature Message-Id: <20050727161605.5711fcf7.akpm@osdl.org> In-Reply-To: <20050728002244.5163ac4a@localhost> References: <20050728002244.5163ac4a@localhost> X-Mailer: Sylpheed version 1.0.4 (GTK+ 1.2.10; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Florian Engelhardt wrote: > > Hello, > > first of all, sorry for the long headline. > second: > Every time, i try to do the following: > cat /proc/acpi/thermal_zone/THRM/temperature > the whole system looks up for a short period of time (something about > 0.5s). realy everything, video and audio encoding, mouse and keyboard > input, firefox playing a flash animation, ... > I am also getting the following: > Losing some ticks... checking if CPU frequency changed. > > maybe these two things are belonging to each other. > > I am using a 2.6.12-rc3-mm1 kernel on a amd64 with a nvidia nforce4 > mainboard. It might help if you were to generate a kernel profile: readprofile -r for i in $(seq 10) do cat /proc/acpi/thermal_zone/THRM/temperature done readprofile -n -v -m /boot/System.map | sort -n +2 | tail -40