Messages in this thread | | | Date | Wed, 21 Feb 2001 18:01:46 +0000 (GMT) | From | Tigran Aivazian <> | Subject | Re: Detecting SMP |
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On Wed, 21 Feb 2001, Jeff Garzik wrote:
> On Wed, 21 Feb 2001, Tigran Aivazian wrote: > > yes, just run the famous mptable program. If the machine is SMP then it > > will have a valid Intel MP 1.4 configuration tables so the program will > > show meaningful output. > > Does that allow you to detect multiple processors... or just an SMP board? >
the answer is in section 4.1 of the Intel MP 1.4 spec:
"An MP-compliant system must implement the MP floating pointer structure, ..."
So, one would normally expect this to mean an SMP board rather than multiple processors, _HOWEVER_, I can imagine a very clever MP-aware BIOS implementation which detects that there are many processors and prepares MP floating config table and does _not_ prepare it otherwise. So, it all depends on the BIOS implementation.
Actually, I never tried unplugging all-1 processors from my SMP machines and seeing what sort of MP table is left...
Regards, Tigran
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