Freebsd as a virtualbox HOST

Maurizio Vairani maurizio.vairani at
Fri Apr 4 13:18:05 UTC 2014

On 04/04/2014 14:42, R. Scott Evans wrote:
> On 04/03/14 04:58, Maurizio Vairani wrote:
>> I am running FreeBSD 9.2-STABLE as a VirtualBox host with three Windows
>> 7 VM from February 2013.
>> The FreeBSD server has an Intel i7 with 64 GB RAM. The server and the
>> VMs are very, very stable.
>> I am writing this mail in a Windows 7 VM via Mac OS X Remote Desktop and
>> seems to work on real PC.
>> The only real, unique issue is  the VM clock drift: it is slow, very
>> slow and I need to synchronize it every 5 minutes.
>> In the log I can read from +105ms to +50,43s as adjustment.
>> Regards
>> Maurizio
> I had the exact same problem with clock drift pop up on one of my 
> previously non-problematic FreeBSD VM's running on a FreeBSD host 
> about a month or two ago when all the NTP attacks started.  I locked 
> down NTP at that time on the guest and host systems but also made a 
> bunch of other changes trying to fix it so I'm not sure which was the 
> final solution but if it wasn't the NTP issue my next guess was that 
> it might have been a case of me updating the VirtualBox port (and 
> others) on the host and then not reloading the virtualbox kernel 
> module or rebooting the host after the port update.  Regardless, it's 
> not an issue for me any longer (ie, any drift I am seeing is minimal 
> and ntpd is able to keep up on it's own).
> -scott
Hi Scot,
thank you for sharing your experience. I update the server nearly every 
day and when I update VirtualBox I shut down the VMs and reboot the server.
But what version of FreeBSD and VirtualBox are you running ?
Are you using Windows VMs ?


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