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Re: [Xen-users] Dom0 and Domu sharing a physical IRQ results ineventual crash

From: "randall ehren" <randall@xxxxxxxxxxxxx>

Date: Thu, 12 Jun 2008 10:16:09 -0700

Cc: Christopher Isip <cmisip@xxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx

Delivery-date: Thu, 12 Jun 2008 10:16:43 -0700

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List-id: Xen user discussion <xen-users.lists.xensource.com>

http://irqbalance.org/

On Tue, Jun 10, 2008 at 7:21 PM, [STD]Ein <ein@xxxxxxxxxxxxxx> wrote:

As previously discussed in the list, adding noirqdebug to your dom0 kernel line *may* solve the issue. However, don't get your hopes too high, as sharing irq's across domains is problematic at best. Your best bet is to try enabling any apic/ioapic options in the bios, as this may reduce/eliminate irq sharing. Again, that is a may, both of the machines that I have available to me (two different chipsets) create identical irq maps regardless, but your mileage may vary.

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Christopher Isip
Sent: June 9, 2008 9:35 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Dom0 and Domu sharing a physical IRQ results ineventual crash

I have one xen machine where dom0 libata and pcibacked domU eth0 share a physical IRQ. I thought that the disk was bad (cause the system was crashing and giveing me disk errors) and replaced it with an IDE disk connected to a pcibacked SATA-IDE combo card. Problem seems to have gone away. The machine runs stably and hasn't crashed yet.

Now I have another machine where I pciback usb. The usb port in domU shares a physical irq with the dom0 libata. The machine crashes every few hours with disk errors. In the domU, I see usb related errors as well (usblp removed, etc.).

Is there anyway to prevent the irq sharing? I think this is the cause of the crash.

Thanks
Chris

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