nanopi-r2s-ubuntu-server-minimal-image
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IP Forward Slow Issue
You may refer to this https://www.right.com.cn/FORUM/thread-4017145-1-1.html for a possible solution. But it is in Chinese, you may feel free to contact me if you have issues about the language. I don't really have time on this. Sorry!
Thanks for the pointer. I will get back to this when Kernel 5.10 stable is released.
If i understand that correctly, flow control should be on. In theory, it is ON for TX/RX.
ubuntu@nanopi-r2s:~$ cat /sys/module/stmmac/parameters/flow_ctrl
3
3 = TX and RX control ON.
Maybe the problem is in eth1 (usb3).
Well...I don't have other ideas about this issue though.