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Re: [PATCH 1/3] mac80211/minstrel_ht: improve rate selection stability

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Felix Fietkau wrote:
> Under load, otherwise stable rates can easily fluctuate because of
> collisions. In my tests on a clean channel, the success probability of
> the max throughput rate often stays somewhere between 90% and 100% under
> load. This can cause some unnecessary switching to lower rates.
> This patch improves stability by treating success probability values
> between 90% and 100% the same.
> In my tests on a 3x3 HT20 link with lots of TCP traffic, it improves the
> average throughput by a few mbit/s.

Some test results:

Sta: WB222 (2x2)
AP : DB120, AR9380 (3x3) (Channel 36, HT40+)
Distance: About a meter.

With ath9k RC:
[SUM]  0.0-60.0 sec  1.42 GBytes   203 Mbits/sec

With minstrel_ht, current HEAD:
[SUM]  0.0-60.0 sec  1.35 GBytes   193 Mbits/sec

with minstrel_ht, HEAD + these 3 patches:
[SUM]  0.0-60.1 sec  1.41 GBytes   202 Mbits/sec

Sujith
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