[Testing] some errors on iwconfig

[supat at supat.eu.org]

always got below errors:

eth0      MRVL-USB8388  ESSID:"zxc555"  Nickname:"zxc55555"
           Mode:Managed  Frequency:2.412 GHz  Access Point: 
00:15:E9:F9:29:CA
           Bit Rate:11 Mb/s   Tx-Power=15 dBm
           Retry limit:8   RTS thr=2347 B   Fragment thr=2346 B
           Encryption key:off
           Power Management:off
           Link Quality=100/100  Signal level=-83 dBm  Noise level=-98 dBm
           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:22023
           Tx excessive retries:293  Invalid misc:648   Missed beacon:0


1. link quality alway 100% which is impossible
2. Rx invalid frag: always happen
3.  Tx excessive retries: always high
4. Invalid misc: alway increasing in numbers.