[Voyage-linux] regarding support for AR922X atheros cards

[srinivas prasad]

hi,
I am using *voyage-0.8.0* OS which has *3.0.0-voyage *as kernel and it is
installed in ALIX node. I am using AR922X wireless cards from atheros and
compat wireless's(3.1.1.1-1) *ath9k* as driver. I am getting into an issue
when subjecting the cards to stress. Whenever I try to send traffic at the
rate of 54 MBps between two alix nodes (one as AP and one as client), the
traffic initially proceeds normally for around 5-10 minutes. After that,
the AP disconnects from the client and the client can never again associate
back with the AP. I need to restart hostapd and then only reconnect. I
tried different cards that interface with ath9k and I get the same result,
so I am assuming that it must be a problem with the driver or kernel.

I get the following error message in the kernel. I dont know if the below
message is a consequence of the card stopping to work for some reason.
Mar 23 22:42:04 voyage kernel: [ 2569.011358] ath reset
Mar 23 22:42:04 voyage kernel: [ 2569.019484] ath: Failed to stop TX DMA!
Mar 23 22:42:04 voyage kernel: [ 2569.423631] ath reset
Mar 23 22:42:04 voyage kernel: [ 2569.424602] ath: Failed to stop TX DMA!
Mar 23 22:42:04 voyage kernel: [ 2569.453000] ath: DMA failed to stop in 10
ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x00006040
Mar 23 22:42:04 voyage kernel: [ 2569.453101] ath: Could not stop RX, we
could be confusing the DMA engine when we start RX up

Can this be a bug in the voyage kernel? If so, is there a patch I can
apply? It will be really useful if anyone can offer insights into this.

Thank you
Srinivas
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.voyage.hk/pipermail/voyage-linux/attachments/20120323/3cd55ed4/attachment.html>