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SubjectRe: It hurts when I shoot myself in the foot
On Thu, May 23, 2002 at 10:33:05AM -0700, Mike Fedyk wrote:
> 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.

It is not, they are both on the same FSB, at least in Pentium II/III case.

--
Vojtech Pavlik
SuSE Labs
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