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From: Ivan Voras <ivoras@freebsd.org>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: Strange problem with 8-stable,
 VMWare vSphere 4 & AMD CPUs (unexpected shutdowns)
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On 02/10/10 17:05, Andriy Gapon wrote:
> 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.

It looks like your guess is perfectly correct :) The guest has been 
doing buildworlds for an hour and it works fine. Thanks!

It's strange how this doesn't affect the Xeons...