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Date: Mon, 19 Dec 2011 20:41:47 -0500 (EST)
From: "Sean C. Farley" <scf@FreeBSD.org>
To: Larry Rosenman <ler@lerctr.org>
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Cc: freebsd-ports@FreeBSD.org
Subject: Re: Fwd: Lousy timekeeping in VirtualBox 4.0.14
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On Thu, 15 Dec 2011, Larry Rosenman wrote:

> I've set up VirtualBox 4.0.14 on my FreeBSD 10.0-CURRENT (r228498) 
> box, and have a FreeBSD 10.0-CURRENT VM running underneath it.
>
> While the VM is running, it doesn't keep time worth a flip.
>
> This is even with the VirtualBox-Additions in it.
>
> 1) is this expected/known?
> 2) What can we do to fix it?
>
> What diagnostics do you need?
>
> I *CAN* provide ssh access to both the host and the guest.

I recall two things that caused problems for me in the past.  One was 
running a VM in a Linux host that caused havoc on the time under load. 
My only "solution" was to disable PowerNow! in the BIOS.  The second was 
on a WinXP host which was fixed, if I recall correctly, by changing the 
timecounter (kern.timecounter.hardware).  I think I set it to HPET or 
ACPI-*.

I hope one of those helps.

Sean
-- 
scf@FreeBSD.org