Re: ath9k will not tx packets sometimes.

["Toke Høiland-Jørgensen" <toke@toke.dk>]

Ben Greear <greearb@candelatech.com> writes:

> I'm doing a test with 200 virtual stations on each of 6 ath9k radios.
>
> When I configure stations for DHCP, I see cases where stations on a particular
> radio will not transmit anything sometimes.  I see no 'XMIT' logs that show indication of
> frames being received in the driver from the upper stack, but if I use 'tshark' on
> a station interface, it shows frames being 'transmitted'.
>
> I do, however, see this, which looks like it might show
> an issue.  It looks like whatever 'aqm' is, it has an ever expanding number
> of backlog packets:

The aqm is the intermediate queues in mac80211. So this indicates that
the driver is not pulling packets for transmission.

With that many stations, I wonder whether it is due to the airtime
fairness scheduler throttling the station? What is the contents of
debug/ieee80211/wiphy2/netdev\:sta30194/stations/00\:0e\:8e\:69\:b8\:f7/airtime
while the station is not transmitting? And is it all stations on that
particular radio, or only some of them?

-Toke