low throughput with hostap driver and wpa_supplicant

Brian J. Murrell brian at interlinx.bc.ca
Tue Aug 31 03:31:40 EDT 2004


I seem to be suffering very poor throughput using hostap 0.2.4 and
wpa_supplicant from the 0.2 stable branch.  Using the Fedora FC3 2.6.8-
1.526 kernel currently.

iwconfig shows:

$ iwconfig wlan0
wlan0     IEEE 802.11b  ESSID:"ilinx"  Nickname:"brian-laptop"
          Mode:Managed  Access Point: 00:04:E2:B2:C9:52  Bit Rate:11Mb/s
          Sensitivity=1/3
          Retry min limit:8   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=51/70  Signal level=-38 dBm  Noise level=-89 dBm
          Rx invalid nwid:0  Rx invalid crypt:22  Rx invalid frag:0
          Tx excessive retries:27  Invalid misc:1909   Missed beacon:0

so the "rate" seems to be 11Mb/s, but an actual throughput test shows:

$ ttcp -f m -t -s pc
ttcp-t: buflen=8192, nbuf=2048, align=16384/0, port=5001  tcp  -> pc
ttcp-t: socket
ttcp-t: connect
ttcp-t: 16777216 bytes in 44.40 real seconds = 2.88 Mbit/sec +++
ttcp-t: 2048 I/O calls, msec/call = 22.20, calls/sec = 46.13
ttcp-t: 0.0user 0.6sys 0:44real 1% 0i+0d 0maxrss 0+2pf 443+2csw

this is over an AP (SMC) to a 100Mb/s network.

Any ideas what the problem is or how to further debug?

b.

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