Just looking for some feedback on this idea for an improvement.
Currently, for any windows guest OS, we set RTC for the clock source. This
seems to contribute to clock-drift issues leading to BSODs on Windows Server
2008 R2 Guests.
I believe a possible improvement would be to set Windows guests to use the
hyper-v clock. To do this we will need CloudStack to generate the appropriate
Libvirt XML which would look somewhat like the following:
<features>
<hyperv>
<relaxed state='on'/>
<vapic state='on'/>
<spinlocks state='on' retries='8191'/>
</hyperv>
<features/>
<clock ...>
<timer name='hypervclock' present='yes'/>
</clock>
I believe the following code snippet from LibvirtComputingResource.java could
be a starting place to implement this.
if (vmTO.getOs().startsWith("Windows")) {
clock.setClockOffset(ClockDef.ClockOffset.LOCALTIME);
clock.setTimer("rtc", "catchup", null);
Let me know what you all think about this change.
Is there a better place / way to implement this?
Josh Harshman
Cloud Engineer
Security+
Intrinium
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