T510 iwn and 9.0

[Josh Paetzel]

On Sep 8, 2011, at 12:00 AM, Bernhard Schmidt <bschmidt at freebsd.org> wrote:

> 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..
> 

Sure. I can do that. 

> 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..?
> 

It's my desktop. Checking email, connected to an IRC server or three. SSH to a few places. An NFS mount. Windows in vbox running vsphere client connecting to an ESXi box and a web browser running. 

> 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. :)
> 

I can set that up. The WAP is in bridged mode. I can mirror the switch port it's on and plug another system in to that port and get a dump. 
 I'll set this all up in a couple hours. 

>> 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

Thanks,

Josh