Cudy AP3000 Speed Problem

Installing and Using OpenWrt
1

Cudy AP3000 with OpenWrt 24.10-SNAPSHOT (r28364-1e079d790a) installed, modifications attempted for acceleration.

Settings:

  • Hardware flow offloading - enabled
  • RPS flow control - enabled
  • WED - enabled

Radio: MediaTek MT7981 802.11ac/ax/n

  • Channel: 120 (5.600 GHz)
  • Transmit power: 22 dBm
  • Signal: -39 dBm | Noise: -90 dBm
  • Transmission speed: 2401.9 Mbit/s | Country: PL

Test results:

  • Phone: Wi-Fi 6 link 1.2 Gbps AX 80 MHz 1200.9 Mbit/s, 80 MHz, HE-MCS 11, HE-NSS 2
  • Tablet: Wi-Fi 6 link 2.4 Gbps AX 160 MHz 2401.9 Mbit/s, 160 MHz, HE-MCS 11, HE-NSS 2
  • Laptop: Wi-Fi 6 link 2.4 Gbps AX 160 MHz 2401.9 Mbit/s, 160 MHz, HE-MCS 11, HE-NSS 2

Regardless of what I try, when using www.speedtest.net (app), the speed is limited to around 380-400 Mbps. However, the test through the FING app shows better results, which is puzzling. On the 2400 Mbit/s link, the speed is around 720 Mbps, and on the 1200 Mbit/s link, around 620 Mbps.

Internal speedtest in the console:

  • Download: 980.97 Mbit/s
  • Upload: 155.32 Mbit/s

iperf3 test:

  • 2400 Mbit/s link: 1.3-1.5 Gbps
  • 1200 Mbit/s link: 600-750 Mbps

With the original firmware, speeds used to exceed 800 Mbps.

I would greatly appreciate some help in identifying the issue. It seems like something is artificially limiting the speed to around 400 Mbps. How can I resolve this? Also, is it possible to revert to the original firmware from Cudy? If so, how can it be done?

2

Frequencies bands are 2.4GHz and 5GHz, there is no 1.2 GHz.

3

Sorry, I used the wrong units in a rush. I meant the radio link speed, not the Wi-Fi frequency.

4

How can it be in a rush, you asked the same question on reddit 12hrs ago...?

5

Yes, I asked about this on Reddit, and they told me to ask on the official forum. I don’t see the point of nitpicking over units when everyone clearly understood what I meant anyway... It won’t help me or anyone else solve the problem in the future.

6

Nope, everything is quite confused.
Feel free to edit your message and correct what's wrong. Also precise the role of the device (AP, router) and its configuration files /etc/config/network and /etc/config/wireless
Also notice that channel 120 is an unauthorized channel within DFS restrictions. Try channel 36.

Detailed-5-GHz-Channel-Allocations
Detailed-5-GHz-Channel-Allocations1261×526 53.5 KB

7

So here it is:

Link: Fiberlink 940/120 mbits

(ISP) Dasan H660GM ---> TP-Link ER605 ---> Switch TP-LINK SG3428X-M2 ---> Poe Injector ---> Cudy AP 3000

WiFi test: on Galaxy S20 Fe phone: link 1200mbits 80mhz cuts to about 400mbits on speedtest.net app
WiFi test: on XIAOMI Redmi Pad Pro tablet: link 2400mbits 160mhz cuts to about 400mbits on speedtest.net app
WiFi test: Gigabyte AORUS 17 XE4 notebook (Intel Wi-Fi 6E AX211 160MHz) : link 2400mbits 160mhz cuts to about 400mbits www.speedtest.net
eth test: notebook Gigabyte AORUS 17 XE4( Realtek Gaming 2.5 GbE Family Controller): Download: 933.25mbits Upload :119.8mbits

iperf3 wifi test: Laptop(client)---> Cudy AP 3000(server) 1.19 Gbits/sec

Speedtest in SSH Cudy ap3000:

Server #28409: Wieliczka speedtest2.betanet.pl:8080 by Betanet Sp. z o. o. (3 km from you): 10 ms
Ping: 10 ms.
Jitter: 0 ms.
Download: 924.53 Mbit/s
Upload: 172.09 Mbit/s

iperf3 test via cable 2.5g notebook(c) --->cudy(s) :2.29 gbit/s

/etc/config/network:

> config interface 'loopback'
>         option device 'lo'
>         option proto 'static'
>         option ipaddr '127.0.0.1'
>         option netmask '255.0.0.0'
> 
> config globals 'globals'
>         option ula_prefix 'fde8:80e3:8e75::/48'
> 
> config device
>         option name 'br-lan'
>         option type 'bridge'
>         list ports 'eth0'
> 
> config interface 'lan'
>         option device 'br-lan'
>         option proto 'static'
>         option ipaddr '192.168.0.130'
>         option netmask '255.255.255.0'
>         option ip6assign '60'
>         option gateway '192.168.0.1'
>         list dns '1.1.1.1'

/etc/config/wireless:

config wifi-device 'radio0'
        option type 'mac80211'
        option path 'platform/soc/18000000.wifi'
        option band '2g'
        option channel 'auto'
        option htmode 'HE40'
        option country 'PL'
        option cell_density '0'

config wifi-device 'radio1'
        option type 'mac80211'
        option path 'platform/soc/18000000.wifi+1'
        option band '5g'
        option channel 'auto'
        option htmode 'HE160'
        option country 'PL'
        option cell_density '0'

config wifi-iface 'wifinet0'
        option device 'radio1'
        option mode 'ap'
        option ssid 'OpenWrt'
        option encryption 'none'
        option network 'lan'


config wifi-iface 'wifinet1'
        option device 'radio0'
        option mode 'ap'
        option ssid 'OpenWrt_2.4'
        option encryption 'none'
        option network 'lan'
8

There is nothing fancy in your settings. I assume that no encryption is for the tests.

This means that the wifi link between your laptop and the AP is very good. It only involves the AP and no other part of the network.

Your tests showing poor results involve the switch, the main router and routing to the internet. The problem is not in the AP but elsewhere in the network, orrouting performance in the router.

1 Like
9

"I'm also slowly coming to the conclusion that the problem must lie somewhere else. But why does it specifically affect the AP and not the entire network? Over a cable, all devices in the same test utilize the full bandwidth, and nothing blocks them at those 400 Mbps."

10

Perfrom iperf3 tests from each device to another (main routeur <> AP, maybe also PoE injector). Try to find the weak link.

11

Show me your latency in speedtest and bufferbloat test (wifi client).