Re: How many pentium-3 processors does SMP support?

Christoph Hellwig (hch@ns.caldera.de)
Tue, 10 Jul 2001 16:19:43 +0200

On Wed, Jul 11, 2001 at 02:16:39AM +1200, Chris Wedgwood wrote:
> On Tue, Jul 10, 2001 at 04:12:00PM +0200, Christoph Hellwig wrote:
>
> Why limit the user? There are more than enough Linux system that
> have more than 32 CPUs (SGI, DEC, Sun).
>
> The limit is architecture dependant, for ia32/i386 is it 32.

The number of CPUs is currently globally limited to 32 by NR_CPUS in
include/linux/threads.h.

> Making it a per-architecture value or even a config option make a
> lot more sense.
>
> It turns out I was full of it, you can buy off the shelf 32-processor
> systems.

You can. But you cannot buy 32-processor PII (-Xeon) systems that are
supported by Linux.

> In anyone from Compaq is reading this, you should send me a 32-way
> Xeon ASAP just to prove they really work :)

It doesn't.

Christoph

-- 
Of course it doesn't work. We've performed a software upgrade.
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