Re: Hyperthreading

[Marc Dietrich <Marc.Dietrich@hrz.uni-giessen.de>]

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.

Hi,

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.

Greetings

Marc

-- 
Marc Dietrich