Michael> By testing again, and waking the net queue if completions
Michael> arrived, we can avoid taking the tx lock on send
Michael> completion in ip over ib, reducing the lock contention.
Michael> An exception is when the interface is locked: in that
Michael> case we have to look at the head and tail values, so its
Michael> easier to take the lock than worry about smp issues.
Hmm, I still need to think about this for a while. For example, I
can't convince myself easily that nothing bad can happen if we test
netif_queue_stopped() outside of a locked region.
- R.
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