ixgbe input errors at high data rates

[rihad]

rihad wrote:
> Turning hw.intr_storm_threshold back to 1000 solved the problem


Nope, nothing solved, it was a coincidence that the traffic stayed at 
the high level more than a few minutes. Now we're back to this:

> Turning dummynet off ("pipe tablearg", ~6000 table entries) improves
> things a bit: the data rate grows to what it should be and stays at
> that level a couple of minutes, but then it suddenly drops to 4/5 of
> that and stays there a couple of minutes.