The JDC AX6600 is experiencing a bottleneck in its USB port.

[Doanduy09]

I have two JDC AX6600 devices connected to a Fibocom FM350 WWAN card, and the maximum download speed is only 40MB/s. In the same location, when I plug the Fibocom FM350 WWAN card into another device, the download speed reaches 100MB/s. I'm wondering if the USB port on the JDC AX6600 is causing a bottleneck. If I connect a LAN cable, it runs at almost maximum speed. The only issue seems to be with the USB port.

[laipeng668]

USB interface is not a problem, as I can achieve 100MB/s when connecting an external hard drive.

The possible issues might be: Is the driver properly matched? Does the Fibocom FM350 WWAN card have external power?

You can use htop to observe the system during testing.

[laipeng668]

I copied files via Samba to a USB-connected external hard drive (with external power supply).

[Doanduy09]

This is just a RAX3000M access device; it's the same Fibocom FM350 WWAN card, but there are huge differences.

This is the JDC AX6600

Two devices in the same location and with the same USB-C cable.

[laipeng668]

I want to see JDC AX6600's htop.

[Doanduy09]

I want to see JDC AX6600's htop.

I forgot to upload it.

[laipeng668]

Under normal circumstances, None should be selected. Did you possibly choose the wrong option?

If you did nothing wrong, give Software flow offloading a try to see how it works.

[Doanduy09]

Whether I choose it or not doesn't make much difference... if I connect the data transfer device via the LAN port, it can reach 70-80mb/s, the only problem is with the USB port.

[laipeng668]

I'm not entirely sure, but the only difference is the platform variation—one is MTK, and the other is Qualcomm. Additionally, the software versions and drivers may vary.

[laipeng668]

The closed-source firmware you're using for MTK comes with USB acceleration, while the Qualcomm version may not.

[Doanduy09]

I'm not entirely sure, but the only difference is the platform variation—one is MTK, and the other is Qualcomm. Additionally, the software versions and drivers may vary.

My friend has a JDC AX1800 device and is experiencing the same problem; he can't achieve the desired speed.

[Doanduy09]

The closed-source firmware you're using for MTK comes with USB acceleration, while the Qualcomm version may not.

That might be the problem. Could you add something to make it work better? Thank you very much.

I also built it on your GitHub, and it still has the same problem.

[laipeng668]

It's way beyond my ability. Let's leave it as it is for now and see if someone else can do it.

[Doanduy09]

Thank you

[Sankyu-3399]

http://pan.39network.cc:5212/s/gLtJ
I have built firmware for multiple target platforms (primarily focused on IPQ).
It includes USB acceleration and full NSS support (LAN–WAN–Wi-Fi).
You can download the firmware from the link above and test it.