NUMA or not on dual Opteron (was: Re: Linux 2.6.11-rc1)

[Sander]

Linus Torvalds wrote (ao):
> On Wed, 12 Jan 2005, Sergey S. Kostyliov wrote:
> > 2.6.10-rc1 hangs at boot stage for my dual opteron machine
> 
> Oops, yes. There's some recent NUMA breakage - either disable
> CONFIG_NUMA, or apply the patches that Andi Kleen just posted on the
> mailing list (the second option much preferred, just to verify that
> yes, that does fix it).

I was under the impression that NUMA is useful on > 2-way systems only.
Is this true, and if not, under what circumstances is NUMA useful on
2-way Opteron systems?

In other words: why should one want NUMA to be enabled or disabled for
dual Opteron?

Thanks in advance.

-- 
Humilis IT Services and Solutions
http://www.humilis.net
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