Re: Hyperthreading

From: Kelsey Hudson (
Date: Wed Aug 21 2002 - 16:16:11 EST

On Wed, 21 Aug 2002, James Bourne wrote:

> On Wed, 21 Aug 2002, Hugh Dickins wrote:
> > You do need CONFIG_SMP and a processor capable of HyperThreading,
> > i.e. Pentium 4 XEON; but CONFIG_MPENTIUM4 is not necessary for HT,
> > just appropriate to that processor in other ways.
> I was under the impression that the only CPU capable of hyperthreading was
> the P4 Xeon. Is this not correct? I don't know of any other CPUs that
> have the ht feature.

This is currently correct, although I believe Intel has plans to release a
Hyperthreading-capable version of its desktop P4.

> Also, looking at setup.c it's hard to determine if CONFIG_SMP is
> actually required, but it doesn't look like it...

Of course it's required. How are you to take advantage of a "second CPU"
if your scheduler only works on a uniprocessor machine?

 Kelsey Hudson                             
 Software Engineer/UNIX Systems Administrator
 Compendium Technologies, Inc                               (619) 725-0771

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