Testing 802.11n

[Warren Block]

Statistics after it's been up for a while.  From a user perspective, no 
problems with the wireless at all.

# athstats -i ath0
athstats: ath0: Invalid argument
athstats: ath0: Invalid argument
306962       data frames received
22872        data frames transmit
152          tx frames with an alternate rate
5919         long on-chip tx retries
51           tx failed 'cuz too many retries
2064         mib overflow interrupts
MCS9         current transmit rate
81803        rx failed 'cuz of bad CRC
5576         rx failed 'cuz of PHY err
     11           illegal service
     30           OFDM restart
     5535         CCK restart
843          periodic calibrations
-0/+0        TDMA slot adjust (usecs, smoothed)
43           rssi of last ack
35           avg recv rssi
-96          rx noise floor
2396         tx frames through raw api
27334        A-MPDU sub-frames received
12           CRC errors for non-last A-MPDU subframes
540          CRC errors for last subframe in an A-MPDU
167          Number of frames retransmitted in software
2929         A-MPDU sub-frame TX attempt success
117          A-MPDU sub-frame TX attempt failures
Antenna profile:
[0] tx    20762 rx    27979
[1] tx        0 rx   278983

(What's up with the "Invalid argument" messages?)