On Wed, Jan 06, 2010 at 01:23:28PM -0600, Anthony Liguori wrote: > 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. > We reinject PIT interrupts from kernel and RTC interrupts from userspace. -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
