Can the MCX515A-CCAT which has 1 QSFP port Be setup in a loopback mode

I have the MCX515A-CCAT card in my computer essential in a configuration where the TX of the QSFP is conneceted through a system that loops back to the RX port on the QSFP, Is there a way to run Iperf or some Data rate test along this link?

hi amills

For your test, you need at least 2 cards.(connect 2 cards and each card in different VM or namespace)

With 2 cards now i am running into the issue of getting iperf3 to run at full bandwith. 1 side runs it at 25Gbps and the other runs at about 15. Do you have any idea of what to do to solve this?