Re: It hurts when I shoot myself in the foot

[Andreas Dilger]

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.

> 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 and followed the URL I
posted, you would have found the patch to which you refer ;-).

Cheers, Andreas
--
Andreas Dilger
http://www-mddsp.enel.ucalgary.ca/People/adilger/
http://sourceforge.net/projects/ext2resize/