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Date: Wed, 10 Feb 2010 18:05:30 +0200
From: Andriy Gapon <avg@icyb.net.ua>
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To: Ivan Voras <ivoras@freebsd.org>
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Cc: freebsd-hackers@freebsd.org, freebsd-stable@freebsd.org
Subject: Re: Strange problem with 8-stable,
 VMWare vSphere 4 & AMD CPUs (unexpected shutdowns)
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on 10/02/2010 17:36 Ivan Voras said the following:
> It looks like I've stumbled upon a bug in vSphere 4 (recent update) with
> FreeBSD/amd64 8.0/8-stable (but not 7.x) guests on Opteron(s). In this
> combination, everything works fine until a moderate load is started - a
> buildworld is enough. About five minutes after the load starts, the
> vSphere client starts getting timeouts while talking with the host and
> soon after the guest VM is forcibly shut down without any trace of a
> reason in various logs. The same VM runs fine on hosts with Xeon CPUs.
> The shutdown happens regardless if there is a vSphere client connected.
> 
> This is very repeatable, on Sun Fire X4140 hosts.
> 
> With 7.x/7.stable guests everything works fine.
> 
> I'm posting this for future reference and to see if anyone has
> encountered something like that, or has an idea why this happens.

Wild guess - try disabling superpages in the guests.

-- 
Andriy Gapon