cae80982c1
Right now ath_rate_sample has a fixed rate schedule, rather than the minstrel_ht style "best, good, most reliable" triplet. So, if higher rates are tried then it'll not fail back to a lower MCS rate in that transmission schedule. This means that in low SNR situations it'll not easily drop to MCS0 unless enough transmissions occur to allow rate control to eventually decide to drop; and if it's TCP traffic it'll get slowed down because of packet loss. It's worse for 2-stream and 3-stream rates; it doesn't ever fall back to lower stream rates, and these higher stream rates required higher SNR to work. So instead let's (for now?) have each of the 11n transmit rates use MCS0 as the last attempt. ath_rate_sample will quickly see that rate succeeds more and will move to it much quicker. Testing: * AR9344 (Wasp) - 2G STA mode
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