ath10k tx to a Macbook Pro stalls

[Andy Lutomirski]

On Mon, Jul 21, 2014 at 11:31 AM, Kalle Valo <kvalo at qca.qualcomm.com> wrote:
> Andy Lutomirski <luto at amacapital.net> writes:
>
>> On my Archer C7 v2, as soon as the MBP tries to do something like
>> playing a video, it seems like frames *to* the MBP no longer get
>> there.  At the very least, arp replies don't get there.
>
> A multicast problem? Can you run for example 'arping -b <macbook's ip>'
> to check if multicast stops working at some point? What if you hardcode
> the ARP address, do unicast packets go to the macbook still?

It's a unicast problem, actually.  arping -b works.  arping w/o -b
gets one reply.

arp -s <IP> ff:ff:ff:ff:ff:ff allows me to ping the MBP (with
moderately high loss).  (I'm actually a bit surprised that Linux is
okay with that.)

Does this mean that the MBP is failing to notice TIM entries, or that
ath10k somehow stops buffering packets to power-saving stations?

>
> If there are multicast problems, my first suspect is always power save.
> Is there a way to disable power save on the macbook for narrowing down
> the problem?
>
> Also we had discussion about macbook problems before and aggreation came
> up as one suspect. Now we have a debugfs interface to change aggregation
> settings, but I doubt openwrt has that yet. Check the archives for more.

I'll keep an eye out for it.

--Andy

>
> --
> Kalle Valo



-- 
Andy Lutomirski
AMA Capital Management, LLC