From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751488AbWJHVpR (ORCPT ); Sun, 8 Oct 2006 17:45:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751489AbWJHVpR (ORCPT ); Sun, 8 Oct 2006 17:45:17 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:52124 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S1751488AbWJHVpP (ORCPT ); Sun, 8 Oct 2006 17:45:15 -0400 Subject: Re: BIOS THRM-Throttling and driver timings From: Arjan van de Ven To: Pavel Machek Cc: Keith Chew , linux-kernel In-Reply-To: <20061008211821.GA4280@elf.ucw.cz> References: <20f65d530610030729o42658bd6hcc204f8deac4a33e@mail.gmail.com> <1159886437.2891.532.camel@laptopd505.fenrus.org> <20061008211821.GA4280@elf.ucw.cz> Content-Type: text/plain Organization: Intel International BV Date: Sun, 08 Oct 2006 23:45:06 +0200 Message-Id: <1160343907.3000.183.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 (2.2.3-2.fc4) Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 2006-10-08 at 23:18 +0200, Pavel Machek wrote: > Hi! > > > > We have a motherboard that has Thermal Throttling in the BIOS (which > > > we cannot disable). This causes the CPU usage to go up and down when > > > the CPU temperature reaches (and stays around) the Throttling > > > temperature point. > > > > > > What we would like to know is whether this will affect the timings in > > > drivers, eg the wireless drivers we are using. What can we check in > > > drivers' code that will tell us that its operations may be affected > > > the throttling? > > > > > > In the past few days, we noticed that some of the linux units we > > > deployed freezes after deveral hours of operation, we are now trying > > > to reproduce the problem in our test environment. Some insight on the > > > affect of throttling will help us narrow down the search. > > > in general linux should be ok with this happening. However for specific > > cases... you'll need to provide more information; you're not > > mentioning > > Really? AFAICT P4 will happily slow down behind our backs, making at > least udelays() with interrupts disabled sleep for too long. it will during thermal throttle yes. but udelay() and co as API never have been super accurate; they mostly promise at least this much delay