T510 iwn and 9.0

[Bernhard Schmidt]

On Wed, Sep 7, 2011 at 18:10, Adrian Chadd <adrian.chadd at gmail.com> wrote:
> On 8 September 2011 00:07, Josh Paetzel <jpaetzel at freebsd.org> wrote:
>> On Wednesday 07 September 2011 07:27:05 Josh Paetzel wrote:
>>> ifconfig wlan0 -ampdutx
>>
>> I've been associated to the wireless at work for about 30 minutes using this
>> parameter with no drops.  I'd say this has fixed it, as the drops I was
>> getting yesterday were every minutes or so and basically made it unusable.

Ok, thanks, so it indeed looks like a TX aggregation issue. Can I talk
you into getting more debug info?
wlandebug 0xffffffff
sysctl dev.iwn.0.debug=0xffffffff
That is indeed quite spammy, but I'm not yet sure what I'm looking for exactly..

TX aggregation is only started if there is certain amount of traffic,
if you say it is within one minute, what kind of traffic was that?
Just some web serving, email, or..?

Also, I would be great if you have another device available to capture
a dump of what's going on. The dump shouldn't get too large if it's
only a minute. :)

> Cool. Bernhard, didn't you mention the ampdu TX bitmap stuff needed
> some surgery in if_iwn?

Yeah, for reporting stats to the ratectl algo, which itself needs some
bigger surgery obviously :) But I'm not convinced that this is
related.

--
Bernhard