Slow Speed on D-Link Dir 2640 (MT7615N)

Here is a issue but only for 5Ghz OpenWrt on MT7621/MT7615N devices with 5GHz problems

Speedtest using speed.cloudflare.com

ONT

Hardware TP-Link XC220-G3v Firmware :1.2.0 0.8.0 v6062.0

Over 5Ghz 80Mhz Wifi - Download 146Mbps Upload 109Mbps

D-Link Dir 2640

OpenWrt 22.03.5

Over 5Ghz 80Mhz Wifi - Download 61.2Mbps Upload 25.2Mbps

with Qosify disabled - Download 96.6Mbps Upload 107Mbps

Packages build using firmware selector

luci luci-app-wireguard luci-app-pbr stubby qosify kmod-ipt-geoip netdata usbutils kmod-usb-storage-uas block-mount kmod-fs-ext4 kmod-usb-storage kmod-usb3 kmod-usb2 kmod-usb-core

Iperf over 5Ghz

Iperf3 over 2.4Ghz

iPerf3 over 2.4Ghz 'Hardware flow offloading' Off

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Iperf3 over 2.4Ghz 'Software flow offloading' Off

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To see what your wifi is capable of, do not run iperf3 on the router but run it on a local wired lan client.
Running iperf3 on the router really bogs the router down.

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Using windows as server connected via Wifi and using same client phone as in previous test is giving worse results

I am far from a wifi expert and testing wireless throughput is difficult, what kind of client how many streams, bandwidth, modulation, polluted spectrum, distance etc. etc.

See: Best practices and tools for measuring wifi performance

Usually I see testing done with 4 parallel streams -P4

But a good place to start is looking at the connection of your client in Status > Overview
make sure your client is active otherwise it will fall back.

Attached picture of my Samsung S20 connected to my router, 5 GHz AX, 80 MHz clean spectrum close to router.
The PHY rate is indeed 1200 Mb/s which is the max for AX routers (Dynalink DL-WRX36) with these settings (for AC it is 866 Mb/s).

Actual iperf throughput is of course way less usually about 2/3 of the PHY rate.
In my case I measured about 700 Mb/s with iperf3 -P4

If the client and server are on the same AP, your results are approximately 50% of what you should expect.

So It is how ? 2640 gives less than 100mbps over wifi ?
onemarcfifty got 600mbps on wifi on 2660 https://youtu.be/wP1ZcQBLL1k?t=362

@lleachii @egc

After that "idot" made note - I asked was it the same issue, you told me no.

Now I'm confused - I noted that posting in multiple threads would cause that.

In order to end confusion - is it possible you can just post about your WiFi issue in the thread you created for it?

EDIT:

You also failed to note that the OP says another user gets normal speed - so everyone is not having the same issue everywhere.

EDIT2:

:spiral_notepad: BTW - you failed to mention that someone did indeed offer you a solution, you should visit your thread and discuss it with them. You should be patient and allow time for others to get relevant information on a 12+ year old WiFi device.

Please try:

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