From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 22 May 2002 23:49:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 22 May 2002 23:49:52 -0400 Received: from h24-67-14-151.cg.shawcable.net ([24.67.14.151]:18427 "EHLO webber.adilger.int") by vger.kernel.org with ESMTP id ; Wed, 22 May 2002 23:49:52 -0400 From: Andreas Dilger Date: Wed, 22 May 2002 21:48:21 -0600 To: "H. Peter Anvin" Cc: linux-kernel@vger.kernel.org Subject: Re: It hurts when I shoot myself in the foot Message-ID: <20020523034821.GK458@turbolinux.com> Mail-Followup-To: "H. Peter Anvin" , linux-kernel@vger.kernel.org In-Reply-To: <200205221615.g4MGFCH30271@directcommunications.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.28i X-GPG-Key: 1024D/0D35BED6 X-GPG-Fingerprint: 7A37 5D79 BF1B CECA D44F 8A29 A488 39F5 0D35 BED6 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On May 22, 2002 16:39 -0700, H. Peter Anvin wrote: > Followup to: <200205221615.g4MGFCH30271@directcommunications.net> > By author: Chris > In newsgroup: linux.dev.kernel > > > > I looked inside the box and found a Pentium II 400, and a Pentium II 450. > > > > Oddly enough they run together as a 266. > > The fact that they have different BogoMIPS figures indicate that that > is not really the case. It looks more like the second processor is > running at 333 MHz or something. You definitely have a bizarre box > here, and you probably should be running with the "notsc" option. > Heck, maybe you can reconfigure your mobo and actually run both > processors at 400 MHz. You'd get quite a performance boost, too... There was a kernel patch posted about5 or so months ago which would "handle" this setup (CPUs with the same clock speed, but different multipliers). Alan Cox said it probably was a bad idea, so it wouldn't go into the kernel, but the patch may still be usable. This is sometimes called "asymmetric multiprocessing", and the thread is at http://marc.theaimsgroup.com/?l=linux-kernel&m=98519070331478&w=4 Cheers, Andreas -- Andreas Dilger http://www-mddsp.enel.ucalgary.ca/People/adilger/ http://sourceforge.net/projects/ext2resize/