Re: support for hyperthreading?

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On Tue, Mar 11, 2003 at 05:57:47PM +0200, Markku Kolkka wrote:
> Viestissä Tiistai 11. Maaliskuuta 2003 05:12, Michael Wardle kirjoitti:
> > http://www.kerneltrap.org/node.php?id=391
> >
> > The above link suggests that HT support was first introduced for 2.5.31.  I
> > doubt whether it's been backported to the 2.4 series yet.
> 
> That's about "fully hyperthreading-aware scheduler", which isn't the same as 
> "hyperthreading support". HT will work with any SMP kernel, but the new 
> scheduler should provide improved performance in systems with several 
> physical CPUs.

It's also interesting to note that this is no different than what
Windows is doing.  Windows 2000 "supports" the HT processors, but treats
them as 2 separate physical CPUs.  For a 2-CPU system, you actually need
a 4-CPU license.  For Windows XP, HT is "fully aware" and counts the
logical cpus different than physical cpus.

-- 
Ed Wilts, Mounds View, MN, USA
mailto:ewilts@xxxxxxxxxx
Member #1, Red Hat Community Ambassador Program



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