[Xen-users] Netback grant fails

[Pepe Barbe <elventear@xxxxxxxxx>]

Hello,

For the past year I have been trying to debug a problem with my Xen  
setup that involves a passthrough PCI card. If there was too much  
network traffic (where too much, could be around 5 Mbps) the network  
would freeze and I would loose all my connectivity.
Initially I had the dom0 on Ubuntu 8.04 and things were terrible then.  
If I reached this state, the OS would have something in Ininturrptible  
I/O and I couldn't gracefully shut down, creating the possibility of  
breaking havoc on my software RAID. Since I moved the dom0 to Centos  
5.3 using the latest stable Xen, the problem has abated but still  
happens on rare occasions; at least the system is responsive and I  
restart all the domUs and have the network come back.
It happened recently again I think I have found something that could  
be interesting in the Kernel Log (Posted at the end of the email).
The card in question uses the tg3 driver and requires it to be setup  
in PCI permissive mode. As you will see, the first line of my paste  
below says 'ACPI: PCI interrupt for device 0000:04:00.0 disabled' and  
then the netback fails.
Any ideas of what is going on or what could I do so I can reduce the  
likelihood of this happening again even more?
Thanks,
Pepe

ACPI: PCI interrupt for device 0000:04:00.0 disabled
eth0: port 2(vif2.0) entering disabled state
device vif2.0 left promiscuous mode
eth0: port 2(vif2.0) entering disabled state
#### netback grant fails

< snip >

#### netback grant fails
eth0: port 4(vif4.0) entering disabled state
device vif4.0 left promiscuous mode
eth0: port 4(vif4.0) entering disabled state
eth0: port 3(vif3.0) entering disabled state
device vif3.0 left promiscuous mode
eth0: port 3(vif3.0) entering disabled state

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