From owner-freebsd-emulation@FreeBSD.ORG  Sun Aug 19 11:34:17 2012
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From: Stephen McKay <smckay@internode.on.net>
To: freebsd-emulation@freebsd.org
Date: Sun, 19 Aug 2012 21:33:57 +1000
Cc: Stephen McKay <smckay@internode.on.net>
Subject: VirtualBox limitations with FreeBSD clients?
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Hi!

I'm trying to get the following setup stable:

    FreeBSD 9.1-beta1 host (Intel Q6600 cpu with 4 cores)
    VirtualBox 4.1.18
    FreeBSD 10-current client (4 virtual cpus)

No matter what I fiddle in kern.timecounter, I get many calcru errors
on the client, for example:

calcru: runtime went backwards from 6968924848397985 usec to 38 used for pid 16 (vnlru)

In fact, that one is more preposterous than most.  I think that many usec
is about 220 years.  Something is completely out of whack here.

So, my questions are:
- do multi-cpu FreeBSD clients work for you in VirtualBox?
- does FreeBSD-current as a client in VirtualBox work for you?
- what's the oldest hardware you've successfully used as a VirtualBox host?

If this has never worked I may as well give up.  But if it works for
most people, maybe it can be traced, and I'll do a much better bug
report. ;-)

Cheers,

Stephen.