-We tried compiling the driver without MSI/MSI-X support, and that appeared to 
make no difference
OK but can you as part of getting the stats get the output from 
/proc/interrupts?  Maybe even looking at the interrupt load before and during 
the test?


Is there any value in trying an earlier kernel version or is that unlikely the 
source of the problem?
Not yet.  Let's look at the stats first.


Is there any value in trying to reproduce the problem using multicast streams 
under Windows (we would have to install a new HD and install windows to do 
this)?
Same as above, let's see what the stats are telling us.  The packets had to go 
somewhere.

Cheers,
John


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