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

["Cinco, Dante" <Dante.Cinco@xxxxxxx>]

The IRQ SMP affinity problem happens on just the passthrough one using MSI.

I've only used Xen 3.4.1. Are you aware of recent code changes that may address 
this issue?

Dante

-----Original Message-----
From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx] 
Sent: Thursday, October 08, 2009 11:06 AM
To: Cinco, Dante; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] IRQ SMP affinity problems in domU with vcpus > 4 on HP 
ProLiant G6 with dual Xeon 5540 (Nehalem)

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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