On 4/1/19 1:05 PM, Toke Høiland-Jørgensen wrote:
Erik Stromdahl <erik.stromdahl@xxxxxxxxx> writes:
Iterating the TX queue and thereby dequeuing all available packets in the
queue could result in performance penalties on some SMP systems.
The reason for this is most likely that the per-ac lock (active_txq_lock)
in mac80211 will be held by the CPU iterating the current queue.
This will lock up other CPUs trying to push new messages on the TX
queue.
Instead of iterating the queue we fetch just one packet at the time,
resulting in minimal starvation of the other CPUs.
Did you test this with Felix' patches reducing the time the lock is held
in mac80211?
-Toke
Hi Toke,
I am not aware of these patches. Can you please point them out for me?
--
Erik
