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RE: [Xen-users] IRQ conflict between dom0 and domU

  • To: <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "[STD]Ein" <ein@xxxxxxxxxxxxxx>
  • Date: Wed, 28 Nov 2007 18:53:16 -0600
  • Delivery-date: Wed, 28 Nov 2007 16:54:04 -0800
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: Acgx7ldNzB9tOiTFQTGRAgsSOsa3rgABJnOgAAuo7JA=

Add a 'metoo' to that.

It's amazing that modern hardware sporting ioapic's still manage to bind
multiple devices to the same irq, my machine at one point had two pci nic's,
onboard audio, onboard usb, and smbus all on the same irq.  As you can
imagine, it was very unstable.  Still looking for a proper solution myself,
disabling audio and usb and moving one of my nic's reduced the sharing to a
level that brought back system stability, but I'd really rather have all
that back.

Also, I've found sharing irq's between dom0 and domU (and likely domU-domU)
leads to massive instability (at least in my experience.. with one machine),
so switching the pci slot to move the domU nic onto a different irq (and
probably forcing sharing for another device) might help you.

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Boudreau Luc
Sent: November 28, 2007 1:18 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] IRQ conflict between dom0 and domU


I've had trouble lately with network hangs on a CentOS 5 dom0/domU.
After more research, I discovered a conflict between a PCI card
dedicated to a domU using IRQ 16 and my dom0 which also used the IRQ 16
for the usb hub. I'd like correct this but I don't know where to start.

What are my options to make the domU use the card on another IRQ ??


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