Re: It hurts when I shoot myself in the foot

[Andreas Dilger]

On May 22, 2002  16:39 -0700, H. Peter Anvin wrote:
> Followup to:  <[e-mail]>
> By author:    Chris <[e-mail]>
> 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/