RE: Xen system skew MUCH worse than tsc skew (was RE: [Xen-devel]RE: [PATCH] record max stime skew (was RE: [PATCH] strictly increasinghvm guest time))

["Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx>]

> Some NUMA systems have different oscillators on each node so you can't
> rely on the frequency being identical. Such systems are fairly rare
> (though their common use case is server virtualization). I guess a
> command line option to enable independent calibration for 
> these systems
> would be OK, though it would obviously be better to start off assuming
> the frequencies are identical, and then detect rate differences. 
> 
> Ian

Good point.  This is the way that Linux does it too, I think.

Dan



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