I'm running 17.01.4. I can see under "associated Stations" my IP and MAC listed as 400Mbits to 800Mbits (it varies), and 80Mhz. Then a few seconds later it drops to 6Mbits and 20Mhz. It will do this constantly about every 30 seconds or so.
I guess ultimately I'm having severe stability issues with AC/5Ghz. I've used wifi analyzer and I only have 1 competing AP using channel 42.
I don't mind dynamically changing speeds but to go from 600Mbps to 6, really! can I control this dynamic rate scaling? Remember I have 2 C7's and will be adding a third.
My config was nearly identical except VHT80 instead of VHT40. wifi analyzer doesn't show congestion so I should be able to use 80.
I also notice that the bit rate for the radio always shows 6Mbps, any clue why? Also the client TX rate is always 6Mbps @ 20Mhz. Is this to be expected?
tx rate is reported as 6mbps due to firmware limitation (no tx rate information in tx completions); instead see /sys/kernel/debug/ieee80211/phyX/ath10k/fw_stats
Then for Rx rate, if there is no demands, it doesn't need full bandwidth. You can run some tput testing while check the Rx rate, it should be very stable.
Anyway, you don't have to worry about everything unless you know what you are worrying about.
Also keep in mind that the rate control algorithms only ramp up the bandwidth if there's actually demand for it, whenever the connection is idle, it always reverts back to the basic rates.