From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761527AbZJNWFK (ORCPT ); Wed, 14 Oct 2009 18:05:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758051AbZJNWFJ (ORCPT ); Wed, 14 Oct 2009 18:05:09 -0400 Received: from lucidpixels.com ([75.144.35.66]:37804 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757771AbZJNWFI (ORCPT ); Wed, 14 Oct 2009 18:05:08 -0400 Date: Wed, 14 Oct 2009 18:04:32 -0400 (EDT) From: Justin Piszcz To: Andreas Mohr cc: linux-kernel@vger.kernel.org Subject: Re: System (motherboard/CPU?) emits high pitch noise when processor.ko is loaded. In-Reply-To: <20091014210558.GA15555@rhlx01.hs-esslingen.de> Message-ID: References: <20091014210558.GA15555@rhlx01.hs-esslingen.de> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 14 Oct 2009, Andreas Mohr wrote: > And that's news exactly how? ;) > Systems and their switching regulators (and especially their backing > coils) have been making noise for more than half a decade now, > depending on which activities frequency is currently taking place > on the system. > > OTOH this means that in your case, maybe some interval in the processor module > (or somewhere related) is ill-chosen (leading to significant, audible differences > between busy/idle state) and should be changed. > > For example, with HZ settings 100 can cause quite a bit of noise on some > machines, whereas 1000 is better, IIRC. And that could be similar for some > processing in this module. > > Andreas > Hi, Ok, well I never had that happen before when loading that module-- although I never normally ran it except for testing purposes, so it was news to me :) CPU was i870 & mobo = DP55KG for reference and I use a HZ setting of 1000. Justin.