[Info-vax] clock problems with OpenVMS x86 on VirtualBox

[Johnny Billquist]

On 2023-05-16 17:07, John Reagan wrote:
> As another datapoint, I'm running Virtual Box on my W10 system.  I have a VM
> running for over 4 days doing lots of compiler testing, etc.  The SHOW TIME
> output is still correct (it matches my W10 clock AND my phone).

I would suspect/expect that your W10 system is having a synchronized 
clock (they do use NTP by default), so it will not drift. And I expect 
Virtual Box will be picking up time from W10 to check that it's 
generating the correct amount of clock interrupts, so that would also be 
accurate over time.

So I'm not at all surprised. You would have jitter on the small scale, 
but in the long run, it should be just fine. That is, unless your host 
OS do not have any time synchronization, in which case I would expect 
the guest OS to show the same drift you would observe on the host OS.

   Johnny