From owner-freebsd-current@FreeBSD.ORG  Thu Dec 22 00:26:23 2005
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Date: Thu, 22 Dec 2005 00:26:23 +0000
From: Kris Kennaway <kris@FreeBSD.org>
To: Gary Jennejohn <garyj@jennejohn.org>
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Cc: current@freebsd.org
Subject: Re: Dual core CPUs support
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On Wed, Dec 21, 2005 at 11:04:53PM +0100, Gary Jennejohn wrote:
> 
> Bruce Burden writes:
> > On Wed, Dec 21, 2005 at 09:12:22PM +0100, Tomas Randa wrote:
> > > Hello all friends of FreeBSD unix,
> > > 
> > > I?d like to ask here, what is the actual situation with dual core CPUs - 
> > > Athlon 64 X2 etc. and their functionality with FreeBSD 5.X / 6.X / 7.0 
> > > current.
> > >
> > > I tried 5.4/i386 with options  SMP, 6.0/i386 with the same config, in 
> > > both cases system found only one CPU, but on 5.4 system wrote HTT 2 
> > > logical units.
> > > 
> > 	The i386 version disables HTT by default (see the security
> >    notices for summer 2005 or thereabouts), so I am not surprised that
> >    your second core is ignored/not reported. There is a switch that
> >    will enable the HTT (second core, in your case) if you wish.
> > 
> > 	As another poster mentiond, the AMD64 version of FBSD will
> >    recognise the second core as expected.
> > 
> 
> HTT has nothing to do with recognizing an X2 AMD64. I've been running
> i386 since before 6R and FreeBSD has always seen both cores.
> 
> Maybe the OP needs a new BIOS. I had to update my BIOS before the X2 was
> correctly recognized.

Yes, that is almost certainly the solution.

Kris