Re: [ath9k-devel] [RFC] ath9k: Detect and work-around tx-queue hang.

[Ben Greear <greearb@candelatech.com>]

On 02/22/2013 04:38 AM, Felix Fietkau wrote:
> On 2013-02-22 1:25 PM, Sujith Manoharan wrote:
>> Felix Fietkau wrote:
>>> Please also check if the station(s) that the frames are queued for are
>>> in powersave state for some reason. That would prevent the tx path from
>>> throwing them in the hw queue, yet they'd still take up pending-frame
>>> slots. I was planning on fixing this eventually by expiring frames that
>>> stay in the queue for too long, but haven't decided on the exact
>>> approach yet.
>>
>> PS is disabled for multi-VIF.
> What about off-channel PS due to scans, etc.

Scan is always locked to the same channel in this setup (once
a single station is associated).

The stations stay associated while this problem happens (the
high-priority queue seems to work just fine, which may be
the reason they stay associated just fine.)

In some cases, I see packets delivered around 30 seconds late...
aside from PS and off-channel..any idea what could make a packet
stick around that long in the tx queues?

Thanks,
Ben

>
> - Felix
>


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com