Messages in this thread | | | From | Andreas Dilger <> | Date | Wed, 22 May 2002 21:48:21 -0600 | Subject | Re: It hurts when I shoot myself in the foot |
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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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