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Date: Thu, 08 Apr 2010 10:11:50 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: Akephalos <akephalos.akephalos@gmail.com>
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Cc: Attilio Rao <attilio@freebsd.org>, freebsd-stable@freebsd.org
Subject: Re: CPU problems after 8.0-STABLE update
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on 08/04/2010 04:29 Akephalos said the following:
> Attilio, I csup-dated several hours ago and rebuilt and installed the kernel
> (and world, in case it matters).
> 
> %uname -a FreeBSD free.bsd369441.org 8.0-STABLE FreeBSD 8.0-STABLE #0: Thu
> Apr  8 03:01:13 EEST 2010
> root@free.bsd369441.org:/usr/obj/usr/src/sys/GENERIC  amd64
> 
> The problem persists without the machdep trick, I see only one processor in
> top with 0.0% CPU load.
> 

Interesting, I couldn't see anything obviously wrong about your hardware.
Could you please post a verbose dmesg from a problematic boot somewhere?
Also, output of 'vmstat -i' and Interrupt request lines portion of 'devinfo -u'
output.
Thanks!

-- 
Andriy Gapon