From owner-freebsd-hackers@FreeBSD.ORG  Sat Jul 14 19:13:51 2012
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Date: Sat, 14 Jul 2012 13:13:50 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Mike Meyer <mwm@mired.org>
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Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>
Subject: Re: FreeBSD 8.3
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On Sat, 14 Jul 2012, Mike Meyer wrote:

> I just set up a system designed to handle lots of VBox VM's: a 6-core
> SandyBridge processor with 32GB of ram on a FreeBSD 8.3-STABLE host.
>
> Unfortunately, once I got it set up, I found that VBox guest
> performance simply sucks. The *mouse* isn't responsive. Linux guests
> see lots of "CPU Locked" errors.

Can you give a specific Linux version that has problems?  I'm willing to 
download and test it on this i5/9-stable/amd64 system.  Haven't noticed 
any problems, but I only occasionally boot Ubuntu in a VM for a little 
bit.