Re: [Xen-devel] IRQ SMP affinity problems in domU with vcpus > 4 on HP ProLiant G6 with dual Xeon 5540 (Nehalem)

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 08/10/2009 01:08, "Cinco, Dante" <Dante.Cinco@xxxxxxx> wrote:

> One of my questions is "Why does domU use only even numbered APIC IDs?" If it
> used odd numbers, then physical flat APIC routing will only trigger when vcpus
> > 7.

It's just the mapping we use. Local APICs get even numbers, IOAPIC gets id
1.

> I welcome any suggestions on how to pursue this problem or hopefully, someone
> will say that a patch for this already exists.

Is this true for all interrupts, or just the passthrough one using MSI?

What Xen version are you using? You say '3.4 unstable' - do you mean tip of
xen-3.4-testing.hg? Have you tried xen-unstable.hg (current developemnt
tree)?

 -- Keir



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