[Make-wifi-fast] mesh deployment with ath9k driver changes

[Pete Heist]

> On Apr 27, 2018, at 1:47 PM, Valent Turkovic <valent at otvorenamreza.org> wrote:
>  If you see more than 5% of frame
> re-transmissions you are having noticeable issues, if you see more
> than 15% of frame re-transmissions your network is probably not
> usable.

An update from the ath9k stats Toke pointed out earlier in the thread on our worst AP (one of two repeaters off one gateway, NLOS):

root at Cabin_12:~# cat /sys/kernel/debug/ieee80211/phy0/ath9k/xmit
                            BE         BK        VI        VO
AMPDUs Completed:      6801646      68748      3000         0
AMPDUs Retried:        1011622       8053       444         0
1011622 / 6801646 = 0.149

And our best AP (one repeater off one gateway, LOS):

root at Cabin_28:~# cat /sys/kernel/debug/ieee80211/phy0/ath9k/xmit
                            BE         BK        VI        VO
AMPDUs Completed:     23947083     118834     31390         0
AMPDUs Retried:        1166349      11402       130         0
1166349 / 23947083 = 0.049

We weren’t entirely sure of the exact meaning of the stats, but 0.049 on one and 0.149 on the other are an indication, and it’s clear what I need to do… :)