RE: [Xen-users] Desynchronize clock

[Steve Brueckner <steve@xxxxxxxxxxxxxx>]

Petersson, Mats wrote:
>> -----Original Message-----
>> I don't want my dom0 to update the clock in my HVM domU.  I've
>> already disabled network-based time synchronization inside the HVM.
>> I've tried
>> setting /proc/sys/xen/independent_wallclock=1 and then restarting
>> xend, but the guest still gets the correct time.
> 
> Did you set independent wallclock in the guest or on Dom0? You should
> set it on guest, as that's "who" should have a different clock to
> Dom0, right? It's a per-domain settings, so individual domains are
> allowed to be either independent or "same".   
> 

Ah, good point.  Unfortunately, the guest is Windows, so there is no 
/proc/sys/xen/independent_wallclock setting inside the HVM.  What I 
need is a way to tell domU which domains should be given access to the 
system or hardware clocks.

In a recent, related post, someone said that for HVMs, "Dom0 time has 
no bearing to the guest's time."  However, every time I reboot the 
Windows HVM it has the correct time.  Since I've disabled network-based 
time synch inside the Windows HVM, I have to assume it's getting the 
time from either dom0's system clock or from the hardware clock on the 
motherboard, no?

Steve Brueckner, ATC-NY

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