irq cpu binding

[Adrian Chadd]

You should totally join #bsdcode on efnet and ask me about it. :)

on RSS, this is what would happen:

* ALL NICs RSS BUCKET 0 -> core 0
* ...
* ALL NICs RSS BUCKET 7 -> core 7

Now, that's not really 100% optimal for NUMA and multiple PCIe
controllers, but we're not there yet.

Hopefully I can twist/cajole navdeep @ chelsio to continue doing a
little more RSS work so I can teach cxgbe/cxl about RSS configuration,
but ixgbe, igb and ixl all do the above when RSS is enabled.



-adrian