On 01/06/2010 01:20 PM, Beth Kon wrote:
Beth Kon wrote:
I will try to look into this. Since HPET is edge-triggered, looks
like this problem is of a different nature than PIT. Is this a solid
failure or intermittent?
Anthony just explained that on x86, even edge-triggered interrupts are
queued in the apic and an eoi will occur, so this is not different
than the PIT.
Not quite queued in the sense that multiple events will be delivered in
order, but I think the point is that you can still detect whether
delivery succeeded by counting APIC EOIs.
The trouble is that historically we've struggled with doing this in
userspace. Maybe it's time to revisit.
Regards,
Anthony Liguori
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