Re: ath5k AP issues

[Michael Buesch <mb@bu3sch.de>]

On Thursday 29 October 2009 13:30:24 Michael Buesch wrote:
> Attached is a wireshark log. Let me explain what you see in there:
> 
> I have an ath5k AP and the powersaving n810 device as STA.
> What I try to do is ping the n810. You can see that at the start of the log.
> 
> Packet #31 is a ping to the n810. #42, too. and so on...
> You see that the n810 does not reply. (not even with an 802.11 ack)
> I guess the n810 is in PS at that time.
> Also note that the TIM sent by the AP is empty.
> 
> What I did at #135 is _simultaneously_ ping from the n810 to the ath5k.
> At that point suddenly both pings running on both ends start to succeed.
> 
> This is with a vanilla 2.6.31.5 kernel, but I can also reproduce this with
> compat-wireless and compat-wireless-stable.
> 

This is dmesg log with verbose PS debugging enabled.

[265617.902457] phy0: Allocated STA 00:1d:6e:9b:c5:a6
[265617.903187] phy0: Inserted STA 00:1d:6e:9b:c5:a6
[265620.539771] wlan0: STA 00:1d:6e:9b:c5:a6 aid 1 enters power save mode

Here I start pinging the n810. No dmesg messages appear and pinging does not work.

When I start pinging _from_ the n810, the following messages appear:

[265660.078055] wlan0: STA 00:1d:6e:9b:c5:a6 aid 1 exits power save mode
[265660.078066] wlan0: STA 00:1d:6e:9b:c5:a6 aid 1 sending 0 filtered/0 PS frames since STA not sleeping anymore
[265660.289206] wlan0: STA 00:1d:6e:9b:c5:a6 aid 1 enters power save mode
[265660.938988] STA 00:1d:6e:9b:c5:a6 aid 1: PS buffer (entries before 0)
[265660.985997] STA 00:1d:6e:9b:c5:a6 aid 1: PS Poll (entries after 0)
[265660.986016] wlan0: STA 00:1d:6e:9b:c5:a6 in PS mode, but pspoll set -> send frame
[265661.008310] wlan0: STA 00:1d:6e:9b:c5:a6 aid 1 exits power save mode
[265661.008321] wlan0: STA 00:1d:6e:9b:c5:a6 aid 1 sending 0 filtered/0 PS frames since STA not sleeping anymore
[265661.226915] wlan0: STA 00:1d:6e:9b:c5:a6 aid 1 enters power save mode


-- 
Greetings, Michael.