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Subject: RE: Hyperthreading
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Date: Thu, 22 Aug 2002 14:58:33 +0200
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Thread-Topic: Hyperthreading
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From: "Nir Soffer" <nirs@exanet.com>
To: "Hugh Dickins" <hugh@veritas.com>, "James Bourne" <jbourne@mtroyal.ab.ca>
Cc: "Reed, Timothy A" <timothy.a.reed@lmco.com>,
       <linux-kernel@vger.kernel.org>
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> 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.
> 
> Hugh

Grepping for MPENTIUM4 in the tree only shows up that it causes the
kernel to be compiled with -march=i686, much like M686 and  MPENTIUMIII.
Are there more subtle ways it affects the kernel that I missed? (in the
2.4.x tree)

Thanks,
Nir.

--
Nir Soffer -=- Software Engineer, Exanet Inc. -=-
"Father, why are all the children weeping? / They are merely crying son
 O, are they merely crying, father? / Yes, true weeping is yet to come"
        -- Nick Cave and the Bad Seeds, The Weeping Song
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