Re: Compat-wireless-3.2-rc6-3 is broken for rt2860 device

Hi Helmut,

happy new year for you, too!

Helmut Schaa schrieb:

Hi Andreas,

Am Samstag, 31. Dezember 2011, 21:35:04 schrieb Andreas Hartmann:

quoted

Andreas Hartmann schrieb:

quoted

Hello,

I tested compat-wireless-3.2-rc6-3 with kernel 3.1 and a rt2860 device
running in AP mode (80211.n - 40 MHz). During

netperf -t TCP_STREAM -H ap

the data stream mostly stalls (-> the device receives data) after a few
seconds and never comes up any more. The connection is completely death.
I have to restart wpa_supplicant to get it working again.



I tried to isolate the problem the following way:

1. Running compat-wireless-3.2-rc6-3 with the rt2x00 level from
compat-wireless-3.1.1-1. The problem didn't gone.

2. Running compat-wireless-3.1.1-1 with the rt2x00 based changes in
compat-wireless-3.2-rc6-3. I can't see the problem any more.


That's why I think, that the problem must be outside the rt2x00 changes.
But there are many changes outside :-).

Removing this patch

mac80211: retry sending failed BAR frames later instead of tearing down
aggr (http://www.spinics.net/lists/linux-wireless/msg76379.html) makes
it working again.

Device is: RaLink RT2800 802.11n PCI

What's the client device connected to the rt2x00 AP?

It's a rt3572 usb chip (Linksys WUSB600N v2), driven with the rt3572sta
module.

Mind to send a
802.11 capture wen this stall happens?

I would try to scan the traffic with a third device in monitor mode
(airmon-ng). But: 802.11n uses more than one channel. How can I get
them? airmon-ng can't be told to listen to more than one channel at a
time (or better: I probably don't know how to do it :-)).

Do you have an idea, how to completely trace 802.11n?


Thanks,
Andreas