FreeBSD on dual core Opterons - stupid buildworld test

[Jung-uk Kim]

On Wednesday 18 May 2005 02:05 pm, Brooks Davis wrote:
> On Wed, May 18, 2005 at 07:29:00PM +0200, Pav Lucistnik wrote:
> > Attila Nagy pí?e v st 18. 05. 2005 v 18:39 +0200:
> > > Hello,
> > >
> > > I did some buildworld tests on an HP BL45p with 4 2,2 GHz
> > > Opterons.
> > >
> > > Sequential time make buildworld -jX times (if there is a
> > > missing iteration, then the build has failed):
> > >
> > > http://people.fsn.hu/~bra/bl45p/dmesg.boot
> > >
> > >  Hyperthreading: 2 logical CPUs
> >
> > So dual-core Opterons report into system as Hyperthreading?
> > Uncool.
>
> What the AMD reps said at a session I attended last year is that
> they report as supporting hyper threading, but set another bit to
> say that they are actually real cores.  We probably need to find
> out what that bit is.

FYI, Linux says:

http://lxr.linux.no/source/include/asm-x86_64/cpufeature.h#L78
http://lxr.linux.no/source/arch/x86_64/kernel/setup.c#L834

Jung-uk Kim

> -- Brooks