Strange measurement results

[matriedel at gmx.de]

Hi

I made with my Orinoco silver card some measurements with iperf under
Linux 2.4.18 with the latest pcmcia package and wireless tools package.
The result I got is quite strange.  I forced the card to run with a Bit Rate
of 2Mb/s.
Iwconfig shows this "Bit Rate=2Mb/s" - but the measurement tells me that the
transfer rate is
5.2 Mbits/sec. It seems that an enforced bit rate has no effect on the real
transfer rate.
Has anyone an idea if this is a bug or a feature????  

Regards

Matthias

Output of iwconfig

          Bit Rate=2Mb/s   Tx-Power=15 dBm   Sensitivity:1/3
          Retry limit:4   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality:47/92  Signal level:-46 dBm  Noise level:-94 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:3
          Tx excessive retries:1  Invalid misc:0   Missed beacon:0

Output of iperf (send 10Mbits/sec UDP stream)

[  3] 47.0-48.0 sec   636 KBytes   5.2 Mbits/sec  0.338 ms  585/ 1221 (48%)
[  3] 48.0-49.0 sec   633 KBytes   5.2 Mbits/sec  0.438 ms  591/ 1224 (48%)
[  3] 49.0-50.0 sec   631 KBytes   5.2 Mbits/sec  0.273 ms  591/ 1222 (48%)
[  3] 50.0-51.0 sec   629 KBytes   5.2 Mbits/sec  0.399 ms  593/ 1222 (49%)
[  3] 51.0-52.0 sec   632 KBytes   5.2 Mbits/sec  0.453 ms  590/ 1222 (48%)

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