Belkin RT3200/Linksys E8450 WiFi AX discussion

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Just a quick followup on my last tests from:

now on:
SNAPSHOT r22190-12a3c863d2
12:03:36 up 1 day, 11:46, load average: 0.29, 0.41, 0.27
CH100, Tx-Power: 24 dBm
MacBook Pro M1
bluetooth disabled (same as last time)

2m away:
80Mhz set in config
-44db
1200.9 Mbit/s, 80 MHz, HE-MCS 11, HE-NSS 2
1134.2 Mbit/s, 80 MHz, HE-MCS 11, HE-NSS 2, HE-GI 1

~ iperf3 -c ethernet_connected_host.local -P 4
[SUM]   0.00-10.00  sec   979 MBytes   821 Mbits/sec                  sender
[SUM]   0.00-10.01  sec   973 MBytes   816 Mbits/sec                  receiver

~ iperf3 -c ethernet_connected_host.local -P 4 -R
[SUM]   0.00-10.01  sec  1005 MBytes   842 Mbits/sec                  sender
[SUM]   0.00-10.00  sec   997 MBytes   837 Mbits/sec                  receiver

160Mhz set in config

~ iperf3 -c ethernet_connected_host.local -P 4
[SUM]   0.00-10.00  sec   969 MBytes   813 Mbits/sec                  sender
[SUM]   0.00-10.01  sec   963 MBytes   807 Mbits/sec                  receiver

~ iperf3 -c ethernet_connected_host.local -P 4 -R
[SUM]   0.00-10.01  sec   917 MBytes   768 Mbits/sec                  sender
[SUM]   0.00-10.00  sec   909 MBytes   763 Mbits/sec                  receiver

160mhz
10m + 1 thin brick wall away:
-64dbm
576.4 Mbit/s, 80 MHz, HE-MCS 5, HE-NSS 2
680.6 Mbit/s, 80 MHz, HE-MCS 7, HE-NSS 2, HE-GI 1

~ iperf3 -c ethernet_connected_host.local -P 4
[SUM]   0.00-10.00  sec   579 MBytes   486 Mbits/sec                  sender
[SUM]   0.00-10.02  sec   576 MBytes   482 Mbits/sec                  receiver

~ iperf3 -c ethernet_connected_host.local -P 4 -R
[SUM]   0.00-10.02  sec   564 MBytes   472 Mbits/sec                  sender
[SUM]   0.00-10.00  sec   560 MBytes   469 Mbits/sec                  receiver

So from my perspective everything working correctly on 5Ghz radio.
However, I started getting abysmal performance on 2.4Ghz:

144.4 Mbit/s, 20 MHz, MCS 15, Short GI
144.4 Mbit/s, 20 MHz, MCS 15, Short GI

This is expected:

~ iperf3 -c ethernet_connected_host.local -P 4
[SUM]   0.00-10.00  sec   102 MBytes  85.4 Mbits/sec                  sender
[SUM]   0.00-10.13  sec  99.8 MBytes  82.7 Mbits/sec                  receiver

This doesn't seem to be right:

~ iperf3 -c ethernet_connected_host.local -P 4 -R
[SUM]   0.00-10.00  sec  7.58 MBytes  6.36 Mbits/sec                  sender
[SUM]   0.00-10.00  sec  7.09 MBytes  5.94 Mbits/sec                  receiver

I observe it on iphone12 too. I think it was introduced several builds away. It degraded not in the build that restored 160mhz, but the one that preceeded it.

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