Xen users - Jun 2008 - Dom0 and Domu sharing a physical IRQ results in eventual 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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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@lists.xensource.com
[mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Christopher Isip
Sent: June 9, 2008 9:35 PM
To: xen-users@lists.xensource.com
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


_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

on my old xen 3.0.1-->3.0.3 servers i had to install
''irqbalance'' to keep
them from crashing. it''s worth a try:

http://irqbalance.org/

 -randall


On Tue, Jun 10, 2008 at 7:21 PM, [STD]Ein <ein@anti-logic.com> 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
irqmaps regardless, but your mileage may vary.
>
>
>  ------------------------------
>
> *From:* xen-users-bounces@lists.xensource.com [mailto:
> xen-users-bounces@lists.xensource.com] *On Behalf Of *Christopher Isip
> *Sent:* June 9, 2008 9:35 PM
> *To:* xen-users@lists.xensource.com
> *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
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>

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