From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264508AbTLMIhA (ORCPT ); Sat, 13 Dec 2003 03:37:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264516AbTLMIhA (ORCPT ); Sat, 13 Dec 2003 03:37:00 -0500 Received: from twilight.ucw.cz ([81.30.235.3]:14754 "EHLO twilight.ucw.cz") by vger.kernel.org with ESMTP id S264508AbTLMIg6 (ORCPT ); Sat, 13 Dec 2003 03:36:58 -0500 Date: Sat, 13 Dec 2003 09:36:54 +0100 From: Vojtech Pavlik To: Jamie Lokier Cc: Vojtech Pavlik , Linux Kernel Subject: Re: Increasing HZ (patch for HZ > 1000) Message-ID: <20031213083654.GA32110@ucw.cz> References: <20031212223128.GA15935@mail.shareable.org> <20031212225856.GA30751@ucw.cz> <20031212234523.GE15935@mail.shareable.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20031212234523.GE15935@mail.shareable.org> User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Dec 12, 2003 at 11:45:23PM +0000, Jamie Lokier wrote: > Vojtech Pavlik wrote: > > > > I'd advocate lower HZ. Say, oh I dunno...100? This is better for power > > > > management and also should make the sound go away. > > > > > > Alas, the sound my Toshiba laptop makes when the CPU is busy is the > > > same frequency whatever kernel, and by extension whatever the timer > > > frequency. I guess it must have another cause :/ > > > > If it's when the CPU is busy, then it's the CPU's DC/DC converter. There > > is no way to get rid of the noise without mnodifying the notebook. > > It only does it when the CPU is busy in any low power mode. In > maximum power mode it never makes the noise. It sounds like it's > coming from the speakers (independent of volume control though), but > it might not be. > > Would the DC/DC converter noise be explained by a low quality > capacitor used by the converter? Yes. -- Vojtech Pavlik SuSE Labs, SuSE CR