In the NV2 QoS settings, I can see the number of queues is configurable (2/4/8).
But, what is the queue size, and would it be possible to make it configurable?
I’m seeing some packet loss under high load even though latency is still acceptable, which suggests the queue may be too small for current wireless AC speeds and bursty traffic.
This is a not so well known issue:
https://en.wikipedia.org/wiki/Micro-bursting_(networking)
and I had to fight hard over it with 2 different upstream providers on 3 separate occasions.
For example, the default queue size on a NEC iPasolink 400 microwave radio is 64 KB, the range is 16-1024 KB and optimal size is more like 1MB at 300 Mbps link (bursty traffic enters through a gigabit port, and leaves through a 300 Mbps radio, so the bursts need to be buffered somewhere). It took a week or so to convince my upstream (a big international telecom/mobile carrier) about it, and it really helped when they finally changed it.
No amount of simple queues in front of the AP will help, as the radio throughput is very variable.
NEC makes the size configurable (they also have settings for 4 or 8 QoS queues etc.), Mikrotik please do it too.