Re: Hyperthreading

From: Marc Dietrich (
Date: Thu Aug 22 2002 - 04:15:26 EST

On Wed, 21 Aug 2002, Hugh Dickens wrote:
> On Wed, 21 Aug 2002, James Bourne wrote:
> > On Wed, 21 Aug 2002, Reed, Timothy A wrote:
> > >
> > > Can anyone lead me to a good source of information on what options >
should be
> > > in the kernel for hyperthreading?? I am still fighting with a
> > > sub-contractor over kernel options.
> >
> > As long as you have a P4 and use the P4 support you will get
> > hyperthreading with 2.4.19 (CONFIG_MPENTIUM4=y). 2.4.18 you have to also
> > turn it on with a lilo option of acpismp=force on the kernel command line.
> 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 used KNOPPIX on a 2 way Dell WS 530 (Xeon 2.0 GHz). This distribution has
CONFIG_M386 set (as most others also?) and HT was not enabled. I compiled the
kernel myself (same config as KNOPPIX but with CONFIG_MPENTIUM4) and HT gets
enabled. So is _does_ matter for which processor the kernel is optimized.



Marc Dietrich

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