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From: Mel <fbsd.questions@rachie.is-a-geek.net>
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Date: Tue, 27 Jan 2009 07:56:23 -0900
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Cc: Tom Everett <tom@khubla.com>, Ewald Jenisch <a@jenisch.at>
Subject: Re: FreeBSD 7.1 SMP on IBM x330 Dual Processor server
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On Tuesday 27 January 2009 06:57:32 Tom Everett wrote:
> How does the kernel I would build from that link differ from the stock
> 7.1 kernel?

It doesn't. It's the generic "upgrading fixes all" advice.
I don't see anything since 7.1-RELEASE in 7.1-STABLE even, that would have the 
potential to fix your problem.

Best thing you can do:
0) Check BIOS if there's something there that can make a CPU 'invisible'.
1) subscribe to freebsd-acpi and ask there if people have seen this before.
2) recompile kernel for acpi debugging, so you have information ready when 
people ask for it
3) regardless of the 1), search for or file a new PR with your ACPI 
information.

More info here:
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/acpi-debug.html
http://www.freebsd.org/support/bugreports.html
-- 
Mel

Problem with today's modular software: they start with the modules
    and never get to the software part.