Chun-Yeow,
Did you check the rate used during packet transmission? Look at the
rc_stats file in /sys/kernel/debug/ieee80211 for you station.
If you test using iperf, maybe try to use multiple stream.
I conducted an iperf test between STA1 and STA2 configured to use a
single stream (MCS7). While the iperf was running I cat the rc_stats
from each STA. Again you can see that due to the large datagram loss the
throughput is ~78Mbps instead of ~125Mbps. I could use help interpreting
the rc_stats output.
On STA1:
# iperf -c 192.168.11.2 -p 7777 -u -b 150M -t 10 -i 1
------------------------------------------------------------
Client connecting to 192.168.11.2, UDP port 7777
Sending 1470 byte datagrams
UDP buffer size: 160 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.11.1 port 59448 connected with 192.168.11.2 port 7777
[ ID] Interval Transfer Bandwidth
[ 3] 0.0- 1.0 sec 15.1 MBytes 127 Mbits/sec
[ 3] 1.0- 2.0 sec 15.2 MBytes 128 Mbits/sec
[ 3] 2.0- 3.0 sec 14.9 MBytes 125 Mbits/sec
[ 3] 3.0- 4.0 sec 15.1 MBytes 126 Mbits/sec
[ 3] 4.0- 5.0 sec 15.0 MBytes 125 Mbits/sec
[ 3] 5.0- 6.0 sec 15.1 MBytes 127 Mbits/sec
[ 3] 6.0- 7.0 sec 15.1 MBytes 126 Mbits/sec
[ 3] 7.0- 8.0 sec 14.9 MBytes 125 Mbits/sec
[ 3] 8.0- 9.0 sec 15.1 MBytes 127 Mbits/sec
[ 3] 9.0-10.0 sec 15.1 MBytes 127 Mbits/sec
[ 3] 0.0-10.0 sec 151 MBytes 126 Mbits/sec
[ 3] Sent 107423 datagrams
[ 3] Server Report:
[ 3] 0.0-10.0 sec 93.0 MBytes 77.8 Mbits/sec 0.259 ms 41090/107424
(38%)
# cat
/sys/kernel/debug/ieee80211/phy0/netdev\:wlan0/stations/00\:15\:6d\:85\:0f\:78/rc_stats
type rate throughput ewma prob this prob this
succ/attempt success attempts
HT20/LGI MCS0 6.6 100.0 100.0 0( 0)
252 252
HT20/LGI MCS1 13.0 100.0 100.0 0( 0)
260 260
HT20/LGI MCS2 19.1 99.9 100.0 0( 0)
238 239
HT20/LGI MCS3 25.0 100.0 100.0 0( 0)
248 248
HT20/LGI MCS4 36.3 99.9 100.0 0( 0)
243 244
HT20/LGI MCS5 46.5 100.0 100.0 0( 0)
267 267
HT20/LGI MCS6 51.2 100.0 100.0 0( 0)
250 250
HT20/LGI MCS7 57.1 100.0 100.0 0( 0)
248 248
HT40/LGI MCS0 13.5 100.0 100.0 0( 0)
267 267
HT40/LGI MCS1 26.1 100.0 100.0 0( 0)
244 244
HT40/LGI MCS2 37.4 99.9 100.0 0( 0)
248 249
HT40/LGI MCS3 48.2 99.9 100.0 0( 0)
251 252
HT40/LGI MCS4 68.0 100.0 100.0 0( 0)
250 250
HT40/LGI MCS5 84.0 100.0 100.0 0( 0)
246 246
HT40/LGI MCS6 93.4 99.9 100.0 0( 0)
237 238
HT40/LGI t MCS7 101.0 100.0 100.0 0( 0)
256 256
HT40/SGI MCS0 14.9 100.0 100.0 0( 0)
250 250
HT40/SGI MCS1 28.7 100.0 100.0 0( 0)
241 241
HT40/SGI MCS2 41.1 100.0 100.0 0( 0)
245 245
HT40/SGI MCS3 52.9 99.9 100.0 0( 0)
552 553
HT40/SGI MCS4 74.0 100.0 100.0 0( 0)
241 241
HT40/SGI MCS5 90.9 100.0 100.0 0( 0)
258 258
HT40/SGI MCS6 97.6 96.6 100.0 0( 0)
238 239
HT40/SGI T PMCS7 108.6 99.9 100.0 405(405)
1686665 1690372
Total packet count:: ideal 1687108 lookaround 5730
Average A-MPDU length: 4.9
On STA2:
# cat
/sys/kernel/debug/ieee80211/phy0/netdev\:wlan0/stations/00\:15\:6d\:85\:02\:de/rc_stats
type rate throughput ewma prob this prob this
succ/attempt success attempts
HT20/LGI MCS0 6.2 100.0 100.0 0(
0) 9 9
HT20/LGI MCS1 11.7 100.0 100.0 0(
0) 8 8
HT20/LGI MCS2 16.5 100.0 100.0 0(
0) 9 9
HT20/LGI MCS3 20.8 100.0 100.0 0(
0) 8 8
HT20/LGI MCS4 28.0 100.0 100.0 0(
0) 9 9
HT20/LGI MCS5 33.7 100.0 100.0 0(
0) 9 9
HT20/LGI MCS6 36.2 100.0 100.0 0(
0) 10 10
HT20/LGI MCS7 39.0 100.0 100.0 0( 0)
296 296
HT40/LGI MCS0 12.1 100.0 100.0 0(
0) 8 8
HT40/LGI MCS1 21.5 100.0 100.0 0(
0) 10 10
HT40/LGI MCS2 28.7 100.0 100.0 0(
0) 8 8
HT40/LGI MCS3 34.7 100.0 100.0 0(
0) 8 8
HT40/LGI MCS4 43.8 100.0 100.0 0(
0) 10 10
HT40/LGI MCS5 50.0 100.0 100.0 0(
0) 9 9
HT40/LGI MCS6 53.1 100.0 100.0 0(
0) 10 10
HT40/LGI t MCS7 55.5 100.0 100.0 0(
0) 9 9
HT40/SGI MCS0 13.3 100.0 100.0 0(
0) 8 8
HT40/SGI MCS1 23.3 100.0 100.0 0(
0) 10 10
HT40/SGI MCS2 30.8 100.0 100.0 0(
0) 8 8
HT40/SGI MCS3 37.0 100.0 100.0 0(
0) 8 8
HT40/SGI MCS4 46.2 100.0 100.0 0(
0) 8 8
HT40/SGI MCS5 52.3 100.0 100.0 0(
0) 8 8
HT40/SGI MCS6 55.5 99.9 100.0 0( 0)
559 561
HT40/SGI T PMCS7 57.7 99.8 100.0 1( 1)
64887 65261
Total packet count:: ideal 65723 lookaround 203
Average A-MPDU length: 1.3
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