Lousy timekeeping in VirtualBox 4.0.14
Li-Lun "Leland" Wang
llwang at infor.org
Fri Dec 16 18:26:36 UTC 2011
On Fri, Dec 16, 2011 at 10:04 AM, Adam Vande More <amvandemore at gmail.com> wrote:
> On Thu, Dec 15, 2011 at 2:11 PM, Larry Rosenman <ler at lerctr.org> 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.
> There is a bunch of tuning you can do with Virtualbox to try and alleviate
> such issues:
> However no combination has worked for me. The only stable config I've been
> able to find is to setup NTP on host and guest and keep vboxservice
> running. Running vboxservice alone results in very erratic timekeeping and
> the service core dumps every few days. Running NTP alone results in the
> difference going too high and out of NTP's allowable range.
I don't remember where I saw it, but have you tried to set the kernel
tunable kern.hz=50 in your guest FreeBSD? It made a huge difference
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