High link speed but low throughput

I ran OpenWRT on my wl-wn530hg4 without major issues. A drop once in a while. But no real issues. I was able to fully utilize my 50MBit internet connection.

I set the channel from 11 to 6 as this area is less crowded and disabled 5GHz band (clients were forced to 2.4GHz anyway). Hoped to fix fix the occasional drops.
I only got 20MBit effectively now. WiFi Link speed is 104MBit@802.11n
Even directly besides the router it isn't better. Tested with different clients.

I played around with some settings but wasn't able to change anything.

Would be glad for any tip. Here my config:

config wifi-device 'radio0'
        option type 'mac80211'
        option channel '36'
        option hwmode '11a'
        option path 'pci0000:00/0000:00:00.0/0000:01:00.0'
        option htmode 'VHT80'
        option txpower '20'
        option country 'DE'
        option cell_density '0'

config wifi-device 'radio1'
        option type 'mac80211'
        option hwmode '11g'
        option path 'platform/10180000.wmac'
        option txpower '20'
        option channels '1 6 11'
        option beacon_int '103'
        option short_preamble '1'
        option channel 'auto'
        option country 'DE'
        option cell_density '0'
        option htmode 'HT20'

config wifi-iface 'default_radio1'
        option device 'radio1'
        option mode 'ap'
        option ssid '**SSID**'
        option key '**PSK**'
        option ieee80211w '1'
        option network 'lan wan wan6'
        option encryption 'psk2'

OpenWrt 21.02.2 r16495-bf0c965af0

You need to make a site survey and verify which channels are less congested in your area. Use some wifi scanner app on your smartphone for that.
Use 5GHz channels, they are less congested than 2,4GHz.

Is this correct? Wifi should be on lan only.

Does this work? I doubt that it will do background scan to select the less congested channel.


Problem was the 802.11w Management Frame Protection. Disabled it and speed is up again.

option channels '1 6 11'
This should work regarding https://openwrt.org/docs/guide-user/network/wifi/basic

Limited the networks to LAN. But as it is a dumb WIFI Ap in the network only and not used as WAN router, it shouldn't matter.

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