On Tue, Apr 13, 2010 at 09:41:57AM -0700, Ben Holt wrote:
> Pasi Kärkkäinen said the following:
> > On Mon, Apr 12, 2010 at 02:47:19PM -0700, Ben Holt wrote:
> > 
> >> Pasi Kärkkäinen wrote:
> >>
> >> On Sun, Apr 11, 2010 at 01:12:09PM -0700, Ben Holt wrote:
> >>
> >> From /var/log/syslog:
> >>
> >> Apr 11 04:22:29 xenserver kernel: [277113.497127] irq 22: nobody cared
> >> (try booting with the "irqpoll" option)
> >> Apr 11 04:22:29 xenserver kernel: [277113.497144] Pid: 0, comm: swapper
> >> Not tainted 2.6.26-2-xen-amd64 #1
> >>
> >> So I assume this is the host/dom0 kernel.
> >>
> >> Yes.
> >>
> >> What device is using IRQ 22?
> >> Try checking from /proc/interrupts or from lspci.
> >>
> >> Is it a shared IRQ (multiple devices using the same IRQ)?
> >>
> >> IRQ 22 is being shared between the SATA controller and a NIC.
> >>
> >> Both /proc/interrupts and lspci are posted below, I should have 
> >> mentioned
> >> as much in my first message.
> >>
> >> Thanks for your response.
> >
> > Is this onboard NIC? Or additional PCI card? Can you move it to a different 
> > PCI slot? 
> > 
> It's a PCI NIC. Unfortunately the other available slots (there are only 
> three on this MB) are being used by the MPEG encoders. I have a free 
> PCI express slot I could use for a PCIe NIC if necessary. Whether 
> moving to a PCIe NIC would actually free up an IRQ is hard to say, 
> though for the price of a NIC it is probably worth trying.
And you did not explicitly mention that the NIC is passed to a domU -
maybe this is causing the problem. Switching NIC roles so that all
devices using IRQ 22 will belong to dom0 may work better.

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