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SubjectRe: It hurts when I shoot myself in the foot
On May 22, 2002  16:39 -0700, H. Peter Anvin wrote:
> Followup to: <200205221615.g4MGFCH30271@directcommunications.net>
> By author: Chris <chris@directcommunications.net>
> 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/

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