Ar6K Driver problems

Andy Green andy at
Thu Jul 17 13:54:23 CEST 2008

Hash: SHA1

Somebody in the thread at some point said:
|> Sorry, don't know much about AR6K, but I have ideas:
|> Ping is short, wget will have bulk packets flying about... it can expose
|> problems maybe still in your power arrangements.  The module wants
|> |400mW during rx and tx IIRC.
| We are sure there is no power problems. The module can take much more
| than the maximum current required in the datasheet. The other point is :
| We have the same problem with the Accton Eval Board in an standard SDIO
| slot as with our custom board.

Ho, OK.

|> You can see if this is the problem by sending abnormal pings, you can
|> both floodping and change the size of ping payload, see man ping.
| We already tried big pings It's working fine :
| ping -s 2048 is working.
| 2048 bytes is maybe not enought.

No it sounds a good sane test, especially -->

| The strange thing is : If we wget an ip with no machine, we have the
| same problem.
| wget http://unused.ip.address


| On a computer, this returns a timeout , on the target with ar6k, we have
| exactly the same log as if we used a valid address. This is the proof
| the problem is with sending the query, not receiving something too big.

Hm well it has some things in common with a real address, it has to do
ARP (but do does ping) of the gateway, then ping will send ICMP and wget
will send SYN and maybe get ACK, etc.

Another idea then snoop this activity in tcpdump with a third machine
with WLAN device in Monitor Mode and see how far it is getting on the air.

- -Andy
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