Hi Everyone,
I've had the wl1271 working for the most part on an Atmel
micro-controller, but I've been fighting with a bug for the past couple
of days.
The problem happens whenever I try to transmit large packets of data
(using iperf, or nc, etc) the driver would hang and no longer be able to
send packets. tx_queue_len in the debugfs would then grow as I tried to
send packets but nothing would actually be sent to the device. At the
same time receiving packets would consistently work all of the time.
When this occurred I usually got the following messages:
atmel_mci atmel_mci.0: data CRC error
wl1271: ERROR sdio write failed (-84) - addr 0x14fd8, 1076 bytes, 1
Firstly, I'd like to let anyone who's interested know that the problem I
had above turned out to be a hardware issue. I tried two newly populated
boards which both turned out not to exhibit this problem. I now have the
wl1271 working on two AT91SAM9G45-EKES development kits.
Using iperf I have gathered some performance data. I am seeing between a
wl1271 device and a host PC (connected via a dlink router):
PC to Device: ~23.0Mbit/s
Device to PC: ~21.7Mbit/s
When running in Ad-Hoc mode between two devices I am getting between
about 15Mbit/s and 17Mbit/s.
Does anyone have any insight as to why the Ad-Hoc mode between two
devices is noticeably slower? Can anything be done to improve this?
Thanks,
Logan
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