From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 3 Feb 2002 16:40:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 3 Feb 2002 16:40:39 -0500 Received: from ip68-4-123-226.oc.oc.cox.net ([68.4.123.226]:18932 "HELO cx518206-b.irvn1.occa.home.com") by vger.kernel.org with SMTP id ; Sun, 3 Feb 2002 16:40:28 -0500 Subject: Re: Machines misreporting Bogomips To: aquamodem@ameritech.net Date: Sun, 3 Feb 2002 13:40:40 -0800 (PST) Cc: brand@jupiter.cs.uni-dortmund.de (Horst von Brand), gboyce@rakis.net (Greg Boyce), linux-kernel@vger.kernel.org In-Reply-To: from "watermodem" at Feb 03, 2002 01:39:37 AM X-Mailer: ELM [version 2.5 PL5] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-Id: <20020203214040.88493896F7@cx518206-b.irvn1.occa.home.com> From: barryn@pobox.com (Barry K. Nathan) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org watermodem wrote: > If they are Intel CPU's and the heatsink <-> CPU connection is poor > (no heatsink compound, heatsink loose) or the fan is dead/dying or > due to dust poor airflow this is reasonable. Intel CPUs slow down > when they get hot as as safety measure. Note that this only applies to Pentium 4's. I believe Coppermine Pentium III's will simply stop running (i.e., the computer freezes altogether instead of slowing down) to prevent overheating. I'm not sure off the top of my head what older Pentiums do, except that they certainly don't have the slowdown trick that the Pentium 4 has. Also, some BIOSes have an option called "CPU Speed at Boot" or something like that, which has a Low and a High setting -- this serves the same purpose as those old Turbo switches. (Note that I'm *not* talking about the SpeedStep settings that newer laptops have in their BIOSes.) -Barry K. Nathan