[ath9k-devel] ath9k debug, low bitrates

[gtolon at inti.gob.ar <gtolon@inti.gob.ar>]

Hi. I'm using some D-Link routers with Openwrt Backfire, each one with 
an Acces Point and an ad hoc interface (using virtual interfaces). Using 
the ad hoc interface between routers sometimes i get good bitrates with 
iperf, 70 Mbps for example, with less than 1% of error, but occasionally 
the error increases to larger values, up to 40%. I don't have reasons to 
think that it's a channel problem, because the routers are very close 
and sometimes the transference is good in one direction and not in the 
other, and i know there's not high interferences. I think that maybe 
it's a problem related to tx dma faillures 
(https://dev.openwrt.org/ticket/9693) but i'm not sure, because 
sometimes the low rates appear without that error.

I know that maybe this is a problem related with openwrt and not with 
the driver, but to be sure i'd like to know more about the debug files 
of ath9k. I was searching for usefull data in the debug files like:

/sys/kernel/debug/ieee80211/phy0/ath9k/wiphy
/sys/kernel/debug/ieee80211/phy0/ath9k/xmit
/sys/kernel/debug/ieee80211/phy0/ath9k/interrupt
/sys/kernel/debug/ieee80211/phy0/ath9k/dma

etc, but i found it very difficult to undersand the parameters showed. 
I've been looking in the source code also, in debug.h, and i saw the 
meaning of some abbreviations, but i still don't know how to interpret 
them. I would appreciate some help on this to use the debug files and 
know if the problem is related with the driver or not. Thanks!


Gabriel