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TCP performance regression in mac80211 triggered by the fq code

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Hi,

With Toke's ath9k txq patch I've noticed a pretty nasty performance
regression when running local iperf on an AP (running the txq stuff) to
a wireless client.

Here's some things that I found:
- when I use only one TCP stream I get around 90-110 Mbit/s
- when running multiple TCP streams, I get only 35-40 Mbit/s total
- fairness between TCP streams looks completely fine
- there's no big queue buildup, the code never actually drops any packets
- if I put a hack in the fq code to force the hash to a constant value
(effectively disabling fq without disabling codel), the problem
disappears and even multiple streams get proper performance.

Please let me know if you have any ideas.

- Felix
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