New Update:

1) Problem of constant disconnecting. I think this problem is solved by updating both cards to the latest firmware revision available at Marvell website. At least the NICs are not disconnecting during intense usage.

2) The problem within connection speed is now even worst.

I've excluded the possibility of the switch by connecting the UnRAID machine with my Desktop machine directly using a cat7 cable.

When I try to do a iPerf3 test, I get 5Gbit in one way and 20Mbit (Yes, Mbit!!) in the other.

Can anyone at TP-Link help me with this problem?

I'm considering returning the 2 NICs if I don't solve this issue.

Regards.

  @David-TP Hi!

I've uninstalled the previous driver (from Marvell website) and installed the driver on the previous post.

To exclude the switch from the problem, I've connected both computers directly without a switch.

Here is the screenshot from iperf3 where UnRAID is the iperf3 server and Desktop PC is the client.

Using "-R" for reverse traffic.

Using "--bidir":

It's way better than before. It's not perfect but at least now I get Gigabit connection on both directions.

But in one way is way better than the other (9.25Gbit vs 5.60Gbit). Is there anything I can change in the driver settings to make both directions achive > 9 Gbit?

Thanks in Advance!!

@David-TP 

Any news?

What else should I do to get full speed?

  @David-TP 

I've tested with 2 PCs. Both with a TX401 card connected directly (without a switch).

In one way I get 9.25Gbit/s (I think it's the maximum throughput the card can provide). But the other way around, I only get 5.6Gbit/s. Why I can get more than 9Gbit??

Is there anything I can do to improve the performance for both directions?

Regards.

  @David-TP 

First of all, I'd like to thank you for your support!

Both cards are installed on a PCIe 4.0 x 16 slot. In Desktop PC the card is installed on Chipset x16 slot but running at x4 . And the UnRAID is on CPU x16 slot.

During the testing both CPU was at 5-10%. I've a AMD 5900X on Desktop and Intel 14500 on UnRAID.

I've made the test you asked and here is the results:

Running using: iperf3 -c 192.168.2.1 -P 4

This test is interesting because running in this way (multithread), the thruput is higher.

But when I run using iperf3 -c 192.168.2.1 -R -P 4

I get a lower result than running using only 1 thread: iperf3 -c 192.168.2.1 -R.

The result is at 9.25Gbit/s.

  @MrFroggy 

This issue is solved!

For the solution, see this post: Solution