Re: [Xen-devel] irq_guest_eoi_timer interaction with MSI

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 13/11/08 16:21, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote:

>> But then there'd be a hypercall for each MSI instance, most of the time
>> without any real need. With a high interrupt rate I'm afraid this does
>> matter.
> 
> I don't understand what you mean. There is a one-to-one-one relationship
> between MSIs, PIRQs, and event channels.

Also I'll add we currently do a hypercall for every level-triggered IO-APIC
IRQ, which was really all we supported until recently. Seemed to work well
enough performance-wise in that case.

 -- Keir



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