Re: at76c503-rfmd beacon drop, have error log

Hi,

On Fri, 31 Oct 2003, vinay bs wrote:

> I have a Belkin F5D6050 usb adapter, and Dlink 614+ router. Running on
> Debian distro, kernel 2.4.18.
>
> Problems:
> 1) iwconfig: returns 0 link quality all the time, signal leve varies from 97
> to 122.
Firmware (binary only, provided by Atmel) for RFMD radios reports signal
level only, link quality and noise level fields are zero.

> 2) cant get stats
Which command?

> 3) Mounted a folder to windows, tried copying files from windows, so I guess
> heavy traffic. After copying for a minute, it says lost beacon, and the
> copying fails. The ssh session I have opened windows is still alive. This is
> easily reproducable.
>
> [Have pasted the error log below]
>
> Any suggestions, patches ?

Your device hasn't received a beacon from the ap for BEACON_TIMEOUT many
seconds. The current behaviour for the driver is to restart and
scan/assoc/authenticate/join, assuming it has left the range of the old
ap. Try to increase the BEACON_TIMEOUT in at76c503.c, line 170.
Or comment out lines 1294-1299 to skip the restart at all. Leave the
info() there to see that you've missed the beacons. I wonder if loosing
beacons is caused on the access point side (too many collisions in the
air) or on the STA side (overload in the firmware, low memory, ...).

/Jörg