Multiple CPUs without SMP

Andrew P. infofarmer at gmail.com
Thu Oct 20 07:06:33 PDT 2005


On 10/20/05, Greg 'groggy' Lehey <grog at freebsd.org> wrote:
> On Thursday, 20 October 2005 at 15:15:39 +0400, Andrew P. wrote:
> > I'm kinda confused.
>
> Yes, that's possible.
>
> > Can I use both processors with a non-SMP kernel?
>
> No.
>
> > I don't need SMP, I would settle on manually assigning CPU affinity
> > to each processor, but I gather FreeBSD can only handle 2+ CPUs with
> > SMP enabled.
>
> I'm wondering if you have misunderstood the purpose of SMP
> (symmetrical multiprocessors).  That's the architecture of the
> motherboard.  If you want to use the second processor, you're
> effectively saying that you want to use SMP.  An SMP kernel is one
> that supports them.
>
> Possibly you're considering using each processor for different
> purposes.  That's conceivable, but FreeBSD doesn't support it.
>
> Greg
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Thanks for your answer.

NUMA architecture would fit some of our servers
so much better. But SMP has its own strengths
which we'll try to use.


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