Freebsd as a virtualbox HOST

R. Scott Evans nanog at
Fri Apr 4 12:42:57 UTC 2014

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).


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