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Slow transmit problems fixed
I tried everything, from using all 4 Tx queues to setting QoS parameters to doing internal queue management.
Turns out none of that was needed - the driver was fine as it, but Apple80211Monitor.bundle which I had disabled for taking too much CPU power, was the reason. Enabled it on a hunch and now transmit/receive are all working perfectly.
However configd and airportd are still eating up all the CPU power, flooding system log with “Apple80211Open() failed” and “BSD driver failed to init” messages. No idea why this happens, if anyone has any clue, feel free to post.
Total hours logged: 235