[Xen-users] cx88_wakeup: 2 buffers handled (should be 1) - PCI/IRQ issues in domU

[Itai Tavor <itai@xxxxxxxxx>]

Hi,

I'm trying to use a DVB-T PCI tuner card in domU. I've had this  
working without any problems in an old configuration of my Xen  
server, but it stopped working when I upgraded the system's hardware  
(CPU and motherboard) and the Xen version (unstable from around May  
to testing from last week).
The symptom is an endless stream of "cx88_wakeup: 2 buffers handled  
(should be 1)" messages in the guest. This is actually a known but  
rare issue, independently of Xen, caused when the system doesn't  
respond to interrupts fast enough. But I've had this working in a  
domU before, so obviously there's something in my current setup that  
creates interrupt issues... but what could it be - Xen setup? BIOS  
setup? Xen bug? Any ideas how to look for the cause?
TIA, Itai

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