On Wed, Jul 29, 2009 at 11:26:14AM +0000, Jarek Poplawski wrote:

If you mean the tx lock there should be no "real" contention: only
one waiter max. qdisc lock's contention might be higher, but it's
use (during contention) better: enqueue + dequeue together instead
of doing it separately.

Hmm, you will have contention if they're both transmitting a
single flow which must always go into a single physical queue.

So you'll have two CPUs doing the work of a single CPU, with one
of them always spinning on the TX lock.

Cheers,
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