From owner-freebsd-smp  Mon Mar 10 10:29:23 2003
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Date: Mon, 10 Mar 2003 19:29:18 +0100
From: Richard Nyberg <rnyberg@it.su.se>
To: John Baldwin <jhb@FreeBSD.org>
Cc: freebsd-smp@FreeBSD.org
Subject: Re: hyperthreading randomness
Message-ID: <20030310182918.GA32085@murmeldjur.it.su.se>
Mail-Followup-To: Richard Nyberg <rnyberg@it.su.se>,
	John Baldwin <jhb@FreeBSD.org>, freebsd-smp@freebsd.org
References: <20030308121852.GA25380@murmeldjur.it.su.se> <XFMail.20030310130013.jhb@FreeBSD.org>
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On Mon, Mar 10, 2003 at 01:00:13PM -0500, John Baldwin wrote:
> 
> On 08-Mar-2003 Richard Nyberg wrote:
> > I have a Dell Precision 450 with 2 xeon CPU:s.
> > The weird thing is that it randomly boots up
> > with either 2 or 4 CPUs on the same 4-STABLE kernel.
> > 2 more often than 4. It seems a bit unpredictable :(
> 
> Hmm, I have no idea about that one.  Hmm, it seems to be a
> "feature" of the BIOS perhaps.  It seems that it may be listing
> the second CPU with an APIC ID of 3 (it's second core) instead
> of 2 (it's first core) in which case the HTT code sees that
> something is not right and doesn't start up any extra processors.
> 

I see.

Do you think this quirk will cause trouble when FreeBSD gets its
CPU info from ACPI?

Happy hacking ;)
	-Richard

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