Re: It hurts when I shoot myself in the foot

[Mike Fedyk <mfedyk@matchmail.com>]

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