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

[Pete Heist]

> On May 31, 2018, at 2:52 AM, David Lang <david at lang.hm> wrote:
> 
> On Sat, 19 May 2018, bkil wrote:
> 
>> In reply to this thread:
>> https://lists.bufferbloat.net/pipermail/make-wifi-fast/2018-April/001787.html
>> 
>> Sorry for the late response, although I can see from yesterday's
>> SmokePing plots that the issue still prevails.
>> 
>> 1.
>> You should definitely not allow rates as low as 1Mb/s considering:
>> * plots of signal vs. rate,
>> * topology of closely packed cabins;
>> * mostly static, noise-free camp ground.
>> 
>> Almost all of your clients were able to link with >20Mb/s even at
>> 70-80dBm. Those below were probably just idling. I'd limit the network
>> to 802.11g/n-only, and would even consider disabling all rates below
>> 12Mb/s.
> 
> I have been wanting to do this on my APs for Scale (wndr3800 APs with ath9k chipsets) and have been unable to find how to do this on these chipsets.

I also didn’t manage to disable specific MCS rates:
- supported_rates and basic_rate in /etc/config/wireless seem to only affect legacy rates, not ht-mcs-2.4 rates.
- "iw dev wlan0 set bitrates” only sets the transmit rate for the AP

But what I did do at 10:45am today, June 8, was disable 802.11b rates with:

uci set wireless.radio0.legacy_rates=‘0'
uci commit
reboot

So at least the minimum rate should be limited to 6Mbit. We’ll see if this helps in the next few days as the camp fills, and if I hear any complaints:

https://www.drhleny.cz/smokeping/

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