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))

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Dan Magenheimer
>Sent: 2008年7月23日 6:27
>
>Perhaps some form of the proposed "deferrable timers" can
>be used to ensure per-cpu calibration happens on different
>processors at roughly the same moment?
>

It can't. Deferrable timer is a per-cpu concept, to rendezvous
what can be deferred on local cpu. There's nothing to 
coordinate across-cpu activities, for which Instead you have to 
use some form of IPIs and self-defined sync process as what
Ian suggested.

Thanks,
Kevin

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