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Thanks, I've set our bug tracker to follow that bug.
Has it been established that it's the same bug though?
I had a brief read of that and I'm not so sure. There's so many things that could impact TX throughput.
I don't have this problem on FreeBSD on my AR9285 NICs and I've ported almost all of the (non-power saving) related code from ath9k. They happily sit at the expected TX/RX speeds in 11g and 11n modes.
Is someone who is experiencing the problem able to do some kernel version bisecting between the known good and known bad kernel?
Adrian