[rt2x00-users] mesh throughput issues

Thomas Pedersen thomas at cozybit.com
Sat Apr 6 09:20:38 AEDT 2013


Hello list,

Thanks for mesh support out of the box!

While testing mesh on the TP-LINK WDN3200 (rt5572) USB card with
linux-next 3/28/13, we see the following throughput pattern:

iperf -s -u -i1
------------------------------------------------------------
Server listening on UDP port 5001
Receiving 1470 byte datagrams
UDP buffer size:  208 KByte (default)
------------------------------------------------------------
[  3] local 20.20.20.2 port 5001 connected with 20.20.20.5 port 50018
[ ID] Interval       Transfer     Bandwidth        Jitter   Lost/Total Datagrams
[  3]  0.0- 1.0 sec  3.36 MBytes  28.2 Mbits/sec   0.253 ms  183/ 2582 (7.1%)
[  3]  1.0- 2.0 sec  10.2 MBytes  85.8 Mbits/sec   0.173 ms    0/ 7296 (0%)
[  3]  2.0- 3.0 sec  9.70 MBytes  81.3 Mbits/sec   0.151 ms    0/ 6916 (0%)
[  3]  3.0- 4.0 sec  8.64 MBytes  72.4 Mbits/sec   0.145 ms    0/ 6160 (0%)
[  3]  4.0- 5.0 sec  10.2 MBytes  85.4 Mbits/sec   0.348 ms    0/ 7258 (0%)
[  3]  5.0- 6.0 sec  9.60 MBytes  80.5 Mbits/sec   0.175 ms    0/ 6845 (0%)
[  3]  6.0- 7.0 sec  8.40 MBytes  70.5 Mbits/sec   0.134 ms    0/ 5994 (0%)
[  3]  7.0- 8.0 sec  7.20 MBytes  60.4 Mbits/sec   0.147 ms    0/ 5135 (0%)
[  3]  8.0- 9.0 sec  5.87 MBytes  49.2 Mbits/sec   0.186 ms    0/ 4187 (0%)
[  3]  9.0-10.0 sec  6.78 MBytes  56.8 Mbits/sec   0.214 ms    0/ 4833 (0%)
[  3] 10.0-11.0 sec  4.73 MBytes  39.7 Mbits/sec   0.865 ms    0/ 3372 (0%)
[  3] 11.0-12.0 sec  3.34 MBytes  28.0 Mbits/sec   1.053 ms    0/ 2382 (0%)
[  3] 12.0-13.0 sec   716 KBytes  5.87 Mbits/sec   6.955 ms   16/  515 (3.1%)
[  3] 13.0-14.0 sec   118 KBytes   964 Kbits/sec  18.974 ms   27/  109 (25%)
[  3] 14.0-15.0 sec  89.0 KBytes   729 Kbits/sec  33.962 ms   93/  155 (60%)
[  3] 15.0-16.0 sec  27.3 KBytes   223 Kbits/sec  47.245 ms 3181/ 3200 (99%)
[  3] 15.0-16.0 sec  2 datagrams received out-of-order
[  3] 16.0-17.0 sec   115 KBytes   941 Kbits/sec   0.978 ms 26508/26588 (1e+02%)
[  3] 16.0-17.0 sec  5 datagrams received out-of-order
[  3] 17.0-18.0 sec  1.12 MBytes  9.42 Mbits/sec   4.899 ms    0/  801 (0%)
[  3] 18.0-19.0 sec   164 KBytes  1.34 Mbits/sec  17.198 ms   36/  150 (24%)
[  3] 19.0-20.0 sec  25.8 KBytes   212 Kbits/sec  37.125 ms 5225/ 5243 (1e+02%)
[  3] 19.0-20.0 sec  3 datagrams received out-of-order
[  3] 20.0-21.0 sec  2.87 KBytes  23.5 Kbits/sec  46.814 ms  494/  496 (1e+02%)
[  3] 21.0-22.0 sec  11.5 KBytes  94.1 Kbits/sec  73.503 ms   48/   56 (86%)
[  3] 22.0-23.0 sec  2.87 KBytes  23.5 Kbits/sec  133.041 ms
14361/14363 (1e+02%)
[  3] 23.0-24.0 sec  5.74 KBytes  47.0 Kbits/sec  141.985 ms  346/  350 (99%)
[  3] 24.0-25.0 sec  2.87 KBytes  23.5 Kbits/sec  137.220 ms 1045/ 1047 (1e+02%)
[  3] 24.0-25.0 sec  1 datagrams received out-of-order
[  3] 25.0-26.0 sec  1.44 KBytes  11.8 Kbits/sec  168.878 ms   48/   49 (98%)
[  3] 26.0-27.0 sec  8.61 KBytes  70.6 Kbits/sec  170.083 ms 3047/ 3053 (1e+02%)
[  3] 27.0-28.0 sec  0.00 Bytes  0.00 bits/sec  170.083 ms    0/    0 (-nan%)
[  3] 28.0-29.0 sec  2.87 KBytes  23.5 Kbits/sec  171.240 ms 2584/ 2586 (1e+02%)
[  3] 29.0-30.0 sec  12.9 KBytes   106 Kbits/sec  101.316 ms 5616/ 5625 (1e+02%)
[  3] 30.0-31.0 sec  0.00 Bytes  0.00 bits/sec  101.316 ms    0/    0 (-nan%)
[  3] 31.0-32.0 sec  11.5 KBytes  94.1 Kbits/sec  63.959 ms 12987/12995 (1e+02%)
[  3] 31.0-32.0 sec  2 datagrams received out-of-order

This was on ch.149 HT40+. Simultaneously, we see a lot of rt2x00
warnings in dmesg [1].

Any hints on how to proceed are appreciated.

Thanks,
-- 
Thomas

[1] http://pastie.org/7333555



More information about the users mailing list