[Xen-devel] Spurious Interrupts with PV drivers for HVM guests

["Ross Maxfield" <rmaxfiel@xxxxxxxxxx>]

I've been testing PV drivers on SLES9 and SLES10 HVM guests and have been very 
impressed with the performance results.  During this testing, however, I 
happened to cat out /proc/interrupts and noticed that ERR: was counting up 
nearly as fast as INT10 -  millions/minute.  I expect INT10 to clip along at 
this rate as my testing is LAN and disk intensive, but a similar rate for 
spurious interrupts was a great surprise. 

I'm curious to know if others are seeing the same thing.

BTW, I'm using NetBench in this particular test case so I can't imagine this 
having anything to do with the test directly.  I also see spurious interrupt 
occur by simply pinging the the guest from a remote client.

-- Ross

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