When my BCM4312 (ID 4315) runs in auto rate mode, the rate stays at
1Mb/s. If I manually set the rate, I see a tcpperf throughput ~1/2 the
rate that I set through a rate of 12 Mb/s. At 36 Mb/s, the rate is
best at 15.7 Mb/s. Why does mistrel not increase the rate?
The output of /sys/..../rc_stats is:
finger@larrylap:~> cat
/sys/kernel/debug/ieee80211/phy0/stations/00:14:bf:85:49:fa/rc_stats
rate throughput ewma prob this prob this succ/attempt
success attempts
1 0.9 99.1 100.0 0( 0) 3244
3282
2 1.8 95.7 100.0 0( 0) 12
12
5.5 4.8 95.7 100.0 0( 0) 12
12
11 9.2 96.8 100.0 0( 0) 12
12
P 6 5.6 99.9 100.0 0( 0) 58
58
9 8.0 95.7 100.0 0( 0) 11
11
12 10.6 95.7 100.0 0( 0) 12
12
18 15.7 96.6 100.0 0( 0) 14
15
24 20.3 95.7 100.0 0( 0) 11
11
36 29.0 95.4 94.5 0( 0) 1602
1670
T 48 38.7 99.2 100.0 1( 1) 32147
37752
t 54 32.9 75.9 100.0 0( 0) 8775
12788
Total packet count:: ideal 2570 lookaround 135
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