Ok, finally got my test rig all set up.
Kernel is Johanne's mac80211-testing (3.9-rc1+) from today.
This test uses two systems cabled up to an attenuator. Attenuation starts
at 30db, adds 10 each time up to 95 (it adds 5 on the last step).
Each step runs for 30 seconds and then goes to the next. I have it
set to zero pause between steps, so a few stats like dropped pkts
will be off slightly. I'm mostly interested in tx/rx bandwidth at this point.
Traffic flow is UDP payload, 24000 byte PDU, tx socket buffer is 2M,
rx socket buffer on peer is 1M.
At least in this test, it appears the ath9k is better in almost all
cases. In particular, it is better at dropping tx rate at very low
signal levels so that at least something gets through.
It should now be easy for me to run these tests over and over, and its
easy to vary the attenuation, etc. I can also run open-air tests.
So, let me know if you have suggestions for different scenarios or patches.
LANforge Machine Stats:
Hostname: lec2010-ath9k-1
OS Version: Linux/x86-32
CPU: Genuine Intel(R) CPU N270 @ 1
Mhz: 0
Memory: 2012 MB
Free Memory: 1643 MB
CPU Cores (incl. HT): 2
LANforge SW Version: 5.2.8 32bit
Starting System Load: 0.23
Interface Information
Interface/Port: vap0
Driver:
Driver Version:
Firmware Version:
Bus Info:
Peer LANforge Machine Stats:
Hostname: ct520-6157
OS Version: Linux/x86-32
CPU: Genuine Intel(R) CPU N270 @ 1
Mhz: 0
Memory: 2012 MB
Free Memory: 1693 MB
CPU Cores (incl. HT): 2
LANforge SW Version: 5.2.8 32bit
Starting System Load: 0.15
Peer Interface Information
Interface/Port: wlan0
Driver:
Driver Version:
Firmware Version:
Bus Info:
Started test at: Wed Mar 6 16:36:43 2013
Iteration Duration: 30000ms Pause Duration: 0ms
Number of running endpoints at end of first iteration: 4
System Load at end of first iteration: 0.28
Endpoint Information:
Endpoint ID: udp-es-as-A Type: LANFORGE_UDP Peer Endpoint ID: udp-es-as-B
ath9k-rate-control:
Summary data for each iteration:
## pld-size cfg-rate tx-bps rx-bps rx-bps-LL tx-pps rx-pps tx-pkts rx-pkts cx-drops drop% rx-lat(ms) atten link-speed
rx-signal
- (bytes) (bps) - peer peer - peer - peer peer peer peer (ddBm) peer
peer
0* 24000 350000000 340253975 338602940 0 1772 1764 53170 52912 258 0.485 34 0 450000000
-35
1* 24000 350000000 340654245 339169494 0 1774 1767 53229 52997 232 0.436 34 0 450000000
-44
2* 24000 350000000 339670155 338371042 0 1769 1762 53077 52874 203 0.382 35 0 450000000
-54
3 24000 350000000 267130991 266529431 0 1391 1388 41742 41648 94 0.225 46 0 364500000
-66
4 24000 350000000 121890337 121557548 0 635 633 19046 18994 52 0.273 95 0 108000000
-74
5 24000 350000000 54566400 54649600 0 284 285 8526 8539 -13 -0.152 211 0 27000000
-81
6 24000 350000000 1088000 947200 0 6 5 170 148 22 12.941 9272 0 13500000
-84
7 24000 350000000 255991 236792 0 1 1 40 37 3 7.500 10447 0 0
0
One-way latency distribution for sampled packets received by the peer endpoint, units: (ms)
## min avg max RTT <= 1 2-2 3-4 5-8 9-16 17-32 33-64 65-128 129-256 257-512 513-1024
0 -43 34 163 34 195 6 18 84 549 3916 48113 0 31 0 0
1 -31 34 129 34 197 12 9 36 387 2680 49640 28 3 0 0
2 -34 35 129 34 205 6 14 66 543 2216 49738 30 1 0 0
3 5 46 129 46 0 0 0 7 24 130 41381 54 2 0 0
4 8 95 1575 129 0 0 0 1 4 0 0 18388 495 8 5
5 70 211 468 232 0 0 0 0 0 0 0 6 8417 65 0
6 205 9272 13013 9429 0 0 0 0 0 0 0 0 1 0 2
7 9695 10447 12759 10682 0 0 0 0 0 0 0 0 0 0 0
minstel_ht rate control
Summary data for each iteration:
## pld-size cfg-rate tx-bps rx-bps rx-bps-LL tx-pps rx-pps tx-pkts rx-pkts cx-drops drop% rx-lat(ms) atten
link-speed rx-signal
- (bytes) (bps) - peer peer - peer - peer peer peer peer (ddBm)
peer peer
0* 24000 350000000 325685144 324366788 0 1696 1689 50890 50684 206 0.405 35 0
81000000 -35
1* 24000 350000000 326549115 325608346 0 1701 1696 51025 50878 147 0.288 35 0
81000000 -44
2* 24000 350000000 325864338 325275557 0 1697 1694 50918 50826 92 0.181 35 0
81000000 -55
3 24000 350000000 257117829 257418619 0 1339 1341 40176 40223 -47 -0.117 45 0
81000000 -66
4 24000 350000000 126391574 126065196 0 658 657 19750 19699 51 0.258 89 0
81000000 -74
5 24000 350000000 52289171 51310069 0 272 267 8171 8018 153 1.872 203 0
30000000 -81
6 24000 350000000 25670400 19200 0 134 0 4011 3 4008 99.925 294 0
6500000 -84
7 24000 350000000 85882275 0 0 447 0 13420 0 13420 100.000 0 0
6500000 -85
One-way latency distribution for sampled packets received by the peer endpoint, units: (ms)
## min avg max RTT <= 1 2-2 3-4 5-8 9-16 17-32 33-64 65-128 129-256 257-512 513-1024
0 3 35 146 36 0 0 3 15 71 2214 48277 73 31 0 0
1 4 35 155 35 0 0 2 7 23 2186 48589 12 42 0 0
2 4 35 120 35 0 0 2 17 30 2267 48445 54 0 0 0
3 5 45 115 45 0 0 0 8 10 89 40025 76 0 0 0
4 5 89 940 90 0 0 0 3 0 0 0 19495 45 11 145
5 101 203 4169 212 0 0 0 0 0 0 0 4 7851 56 58
6 294 294 294 1013 0 0 0 0 0 0 0 0 0 2 0
7 -1 0 -1 0 0 0 0 0 0 0 0 0 0 0 0
Thanks,
Ben
--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc http://www.candelatech.com
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