[Make-wifi-fast] [v3] ath9k: Introduce airtime fairness scheduling between stations

Kalle Valo kvalo at qca.qualcomm.com
Thu Dec 15 03:43:39 EST 2016

Toke Høiland-Jørgensen wrote:
> This reworks the ath9k driver to schedule transmissions to connected
> stations in a way that enforces airtime fairness between them. It
> accomplishes this by measuring the time spent transmitting to or
> receiving from a station at TX and RX completion, and accounting this to
> a per-station, per-QoS level airtime deficit. Then, an FQ-CoDel based
> deficit scheduler is employed at packet dequeue time, to control which
> station gets the next transmission opportunity.
> Airtime fairness can significantly improve the efficiency of the network
> when station rates vary. The following throughput values are from a
> simple three-station test scenario, where two stations operate at the
> highest HT20 rate, and one station at the lowest, and the scheduler is
> employed at the access point:
>                   Before   /   After
> Fast station 1:    19.17   /   25.09 Mbps
> Fast station 2:    19.83   /   25.21 Mbps
> Slow station:       2.58   /    1.77 Mbps
> Total:             41.58   /   52.07 Mbps
> The benefit of airtime fairness goes up the more stations are present.
> In a 30-station test with one station artificially limited to 1 Mbps,
> we have seen aggregate throughput go from 2.14 to 17.76 Mbps.
> Signed-off-by: Toke Høiland-Jørgensen <toke at toke.dk>

Patch applied to ath-next branch of ath.git, thanks.

63fefa050477 ath9k: Introduce airtime fairness scheduling between stations


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