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Re: [Xen-devel] dom0, guests, pci hardware and interrupts...

To: Mike Carney <mc-al34luc@xxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] dom0, guests, pci hardware and interrupts...
From: Keir Fraser <keir@xxxxxxxxxxxxx>
Date: Fri, 10 Aug 2007 17:32:24 +0100
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Thread-topic: [Xen-devel] dom0, guests, pci hardware and interrupts...
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On 10/8/07 17:15, "Mike Carney" <mc-al34luc@xxxxxxxxxxxxx> wrote:

> Any suggestions for how to influence the interrupts that are assigned to
> devices in dom0? It seems that there are a number of physical interrupts
> that are not used, and some are shared:

If the device interrupts are aliasing then that is because the physical
interrupt lines are physically wired together. There's nothing you can do
about that, except try moving PCI cards to different slots (if one of your
devices is not built in to the mobo chipset) and hence use a different
physical interrupt line for that PCI card.

Which interrupt number is shared? If you 'xm debug-key z' and then 'xm
dmesg', a bunch of IO-APIC related debug output should be printed. This
might yield some interesting info (probably just confirming that your
devices really are wired to the same interrupt line).

 -- Keir

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