RE: [Xen-devel] [PATCH] Add the USE_PLATFORM_TIMER flag to the FADT, to make w2k3 use the PMTIMER

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

Could you say more about this?  Which default timesource is
drifting?  Aren't all HVM platform timers emulated on top
of Xen system time?  Does w2k3 use rdtsc directly... under
what circumstances?

Thanks,
Dan

> -----Original Message-----
> From: Tim Deegan [mailto:Tim.Deegan@xxxxxxxxxx]
> Sent: Wednesday, June 02, 2010 4:19 AM
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] [PATCH] Add the USE_PLATFORM_TIMER flag to the
> FADT, to make w2k3 use the PMTIMER
> 
> because the default timesource (TSC) drifts under load.
> 
> The flag is only defined in ACPI 3.0, and we provide ACPI 2.0 tables,
> but Windows seems happy enough to obey it anyway.
> 
> Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
> 
> 

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