From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 23 May 2002 13:33:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 23 May 2002 13:33:17 -0400 Received: from adsl-63-194-239-202.dsl.lsan03.pacbell.net ([63.194.239.202]:44818 "EHLO mmp-linux.matchmail.com") by vger.kernel.org with ESMTP id ; Thu, 23 May 2002 13:33:15 -0400 Date: Thu, 23 May 2002 10:33:05 -0700 From: Mike Fedyk To: Chris , linux-kernel@vger.kernel.org Subject: Re: It hurts when I shoot myself in the foot Message-ID: <20020523173305.GC4006@matchmail.com> Mail-Followup-To: Chris , linux-kernel@vger.kernel.org In-Reply-To: <200205221615.g4MGFCH30271@directcommunications.net> <20020523034821.GK458@turbolinux.com> <20020523044933.GB4006@matchmail.com> <20020523054219.GL458@turbolinux.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.28i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 22, 2002 at 11:42:19PM -0600, Andreas Dilger wrote: > On May 22, 2002 21:49 -0700, Mike Fedyk wrote: > > On Wed, May 22, 2002 at 09:48:21PM -0600, Andreas Dilger wrote: > > > There was a kernel patch posted about 5 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 > > > > I thought asymmetric multiprocessing would support CPUs with different > > speeds. ie, 400 & 450mhz. How would you get different multipliers and same > > Mhz when the CPUs are on the same FSB(ignoring AMD SMP where each processor > > has an exclusive FSB, and this might be possible)? > > That was what I was trying to say: same FSB speed * different multipliers > = different CPU MHZ, like what the original poster is asking about. > I don't think it is possible to configure a motherboard to have different > FSB speeds for two processors. > Me neither, but it seems theoretically possible. > > There was a patch to compare the different features on the CPUs available > > and use the subset available on all processors. > > Hmm, maybe if you had actually read my email I did. ;) > and followed the URL I posted, That I didn't do. :( >you would have found the patch to which you refer ;-). And you are correct. That is the exact patch to which I was referring. Mike