Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S269056AbUJQF2L (ORCPT ); Sun, 17 Oct 2004 01:28:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269057AbUJQF2K (ORCPT ); Sun, 17 Oct 2004 01:28:10 -0400 Received: from sccrmhc11.comcast.net ([204.127.202.55]:47060 "EHLO sccrmhc11.comcast.net") by vger.kernel.org with ESMTP id S269056AbUJQF2G (ORCPT ); Sun, 17 Oct 2004 01:28:06 -0400 Subject: Re: High pitched noise from laptop: processor.c in linux 2.6 From: Albert Cahalan To: linux-kernel mailing list Cc: alan@lxorguk.ukuu.org.uk Content-Type: text/plain Organization: Message-Id: <1097990475.2673.14262.camel@cube> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.2.4 Date: 17 Oct 2004 01:21:15 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1067 Lines: 31 Alan Cox writes: > On Sad, 2004-10-16 at 20:52, Lee Revell wrote: >> [Pavel Machek] >>> What benefits? HZ=1000 takes 1W more on my system. >> >> Better timer resolution? > > And heavily reduced accuracy on a lot of laptops > where 1000Hz is enough to make the clock slide > every time the battery state is queried or an SMM > event triggers. How low is low enough for nearly all of these laptops? Some decent choices: wrongness_% HZ_diff PIT_# HZ actual_HZ -0.00083809 -0.003051 3278 364 363.996949 -0.00016762 -0.000483 4143 288 287.999517 -0.00016762 -0.000724 2762 432 431.999276 -0.00016762 -0.001448 1381 864 863.998552 +0.00008381 +0.000304 3287 363 363.000304 +0.00008381 +0.000435 2299 519 519.000435 +0.00008381 +0.000525 1903 627 627.000525 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/