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Re: support for hyperthreading?



On Mon, 2003-03-10 at 19:25, Peter Larsen wrote:
> On Monday, March 10, 2003 22:09 PM,
> Michael Wardle <michael wardle adacel com> wrote:
> 
> > On Tuesday, March 11, 2003 14:00, Saqib Ali wrote:
> >> Does the latest Linux Kernel support Intel's new HyperThreading
> >> processors?
> >
> > No, if I remember correctly, HT support is just going into the latest
> > development kernel (2.5.x), which means that the current stable kernel
> > (2.4.x) probably doesn't support it yet.
> 
> What do you define as support?
> I'm running Linux tintin 2.4.18-24.8.0smp #1 SMP Fri Jan 31 06:03:47 EST
> 2003 i686 i686 i386 GNU/Linux on a dual XEON with HT, and I do see 4
> processors that all get scheduled with processes. What am I missing?

IIRC, there are NUMA-like processor affinities that can make the HT more
effective, because it will try harder to keep a process on a single set
of processors, which is faster within a single core than between
different ones.

Wil
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