[Click] Why roofnet can not work on high rates

[欧阳鑫]

Hi, everyone.

     I am running roofnet experiments on 2 Ubuntu hosts with 2.6.32-26
kernel. Both are AR5416 cards with ath9k driver. All cards run in Monitor
mode.

     The problem is that hosts seems to be running under 1Mbps rate ONLY.
Command "read srcr/es.bcast_stats" shows:
200 Read handler 'srcr/es.bcast_stats' OK
DATA 363
5.167.1.211 00-25-86-A7-01-D3 seq 1295164746 period 30000 tau 300000 sent 12
last_rx 1.762133
5.167.1.211 00-25-86-A7-01-D3 [ 2 60 100 100 198 0 ]
5.167.1.211 00-25-86-A7-01-D3 [ 2 1500 100 100 197 0 ]
5.167.1.211 00-25-86-A7-01-D3 [ 4 1500 0 100 198 0 ]
5.167.1.211 00-25-86-A7-01-D3 [ 11 1500 0 100 196 0 ]
5.167.1.211 00-25-86-A7-01-D3 [ 22 1500 0 100 197 0 ]
    I do not  know why fwd_rate with 2Mb/s, 5.5 Mb/s and 11 Mb/s are all 0s.

    I forced the data rate to be 5.5Mbps by SetTXRate(11) on PC1, then ping
PC1 on PC2, then I run tcpdump on PC2, the result is as follows:
tcpdump -i wlan0 -n -e -xX

15:59:49.476661 5.5 Mb/s 63dBm tx power [0x00000010] DA:ff:ff:ff:ff:ff:ff
SA:PC2-MAC  BSSID:00:00:00:00:00:00 LLC, dsap SNAP (0xaa) Individual, ssap
SNAP (0xaa) Command, ctrl 0x03: oui Ethernet (0x000000), ethertype Unknown
(0x0941): Unnumbered, ui, Flags [Command], length 1494
        0x0000:  aaaa 0300 0000 0941 0200 87e4 3c00 0b00  .......A....<...
        0x0010:  dc05 0000 05a7 01d3 0100 0000 75a5 324d  ............u.2M
        0x0020:  3075 0000 e093 0400                      0u......
15:59:49.476661 1.0 Mb/s [0x0000000f] DA:ff:ff:ff:ff:ff:ff SA:PC2-MAC
BSSID:00:00:00:00:00:00 LLC, dsap SNAP (0xaa) Individual, ssap SNAP (0xaa)
Command, ctrl 0x03: oui Ethernet (0x000000), ethertype Unknown (0x0941):
Unnumbered, ui, Flags [Command], length 1494
        0x0000:  aaaa 0300 0000 0941 0200 87e4 3c00 0b00  .......A....<...
        0x0010:  dc05 0000 05a7 01d3 0100 0000 75a5 324d  ............u.2M
        0x0020:  3075 0000 e093 04                         0u.....

 15:59:48.460612 5.5 Mb/s 63dBm tx power [0x00000010] DA:PC1-MAC SA:PC2-MAC
BSSID:00:00:00:00:00:00 LLC, dsap SNAP (0xaa) Individual, ssap SNAP (0xaa)
Command, ctrl 0x03: oui Ethernet (0x000000), ethertype Unknown (0x0943):
Unnumbered, ui, Flags [Command], length 162
        0x0000:  aaaa 0300 0000 0943 0b04 0101 0000 fc7b  .......C.......{
        0x0010:  0000 0054 0000 0000 0000 0000 0000 0000 ...T............
        0x0020:  0000 0000 0000 0000
........
15:59:48.460612 1.0 Mb/s [0x0000000f] DA:PC1-MAC  SA:PC2-MAC
BSSID:00:00:00:00:00:00 LLC, dsap SNAP (0xaa) Individual, ssap SNAP (0xaa)
Command, ctrl 0x03: oui Ethernet (0x000000), ethertype Unknown (0x0943):
Unnumbered, ui, Flags [Command], length 162
        0x0000:  aaaa 0300 0000 0943 0b04 0101 0000 fc7b
.......C.......{
        0x0010:  0000 0054 0000 0000 0000 0000 0000 0000
...T............
        0x0020:  0000 0000 0000 00
.......
  It seemed that each packet was caught by tcpdump 2 times, and the 2 copies
share the same timestamp but different rates.

  My second question is why each packet was caught with a rate of 5.5Mb/s
first, and then with a rate of 1Mb/s.

  The attachment is my configuration file: gen_config_roofnet.pl. I do not
know if there is some error with the configuration file. Would you help me
check for it?

 Thank you very much!
-------------- next part --------------
A non-text attachment was scrubbed...
Name: gen_config_roofnet.pl
Type: application/octet-stream
Size: 10878 bytes
Desc: not available
Url : http://amsterdam.lcs.mit.edu/pipermail/click/attachments/20110117/e10a7769/attachment-0001.obj