On 22 March 2016 at 02:35, David Lang [off-list ref] wrote:

On Wed, 16 Mar 2016, Michal Kazior wrote:

quoted

Since 11n aggregation become important to get the
best out of txops. However aggregation inherently
requires buffering and queuing. Once variable
medium conditions to different associated stations
is considered it became apparent that bufferbloat
can't be simply fought with qdiscs for wireless
drivers.

If the network is quiet enough, don't do any buffering, but in almost all
situations you are going to need to buffer starting no later than the second
packet you try to send.

Don't try to make queueing occur, just deal with the queues that form
naturally because you can't transmit data any faster (and work to keep them
under some semblence of control)

[...]

This is what already happens. Queues typically start to build up when
hardware tx fifos/queues become busy so by the time they become
available you might have a bunch of frames you can aggregate.

The patch is more about getting rid of qdiscs because it's inherently
hard to teach them how 802.11 aggregation works (per-station per-tid)
and the ever-changing nature of per-station tx conditions.

I'll update the commit log to better reflect what is being done.


Michał
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