From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261193AbTJ0Ju3 (ORCPT ); Mon, 27 Oct 2003 04:50:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261276AbTJ0Jt5 (ORCPT ); Mon, 27 Oct 2003 04:49:57 -0500 Received: from meryl.it.uu.se ([130.238.12.42]:55194 "EHLO meryl.it.uu.se") by vger.kernel.org with ESMTP id S261193AbTJ0Js5 (ORCPT ); Mon, 27 Oct 2003 04:48:57 -0500 Date: Mon, 27 Oct 2003 10:48:55 +0100 (MET) Message-Id: <200310270948.h9R9mtl5003515@harpo.it.uu.se> From: Mikael Pettersson To: alan@lxorguk.ukuu.org.uk Subject: Re: [RFC] must fix lists Cc: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 23 Oct 2003 22:11:35 +0100, Alan Cox wrote: >On Mer, 2003-10-22 at 03:50, Albert Cahalan wrote: >> The system in question would also lose time when >> under heavy load. Note that HZ is now 1000 HZ. >> If interrupts are kept off for too long or an >> SMI grabs the CPU... > >With a lot of laptops this is a huge problem. Its one of the reasons Red >Hat went back to 100Hz in the RH 2.4 tree. With many laptops your clock >becomes junk at 1Khz. It will be interesting to see if the ACPI timers >help but that wont solve things for older laptops. Or for really old desktops. My 486 loses time at a rate of about 2 minutes per hour when running 2.5/2.6 and doing lots of disk I/O. Changing HZ back to 100 solves that problem. I think we need a CONFIG_HZ. /Mikael