Large discrepancy between the iPerf reported throughput and the UE/gNB reported throughput

[oranresearcher]

I have a 20MHz ZMQ setup successfully running.

However, iPerf reports a much lower value when compared to the gNB reported value. For example, with the iPerf command "sudo ip netns exec ue1 iperf3 -c 10.45.0.1 -i 1 -t 3600 -u -b 20M -R -p 5201" 15 to 25Mbps are reported by iPerf. However, both the gNB and UE report 59M bitrate. For an iPerf of 10Mbps, iPerf reports around 10Mbps but the gNB and UE report 20 to 40M brate.

I understand the gNB and UE brate also includes overhead. However, I am not sure this explains this large difference. Is this expected behaviour?

Some files which might be helpful:

Configuration files
ue_zmq.txt
gnb_zmq.txt

Networking information
networking.txt

[pgawlowicz]

ah, it is running over zmq. Then, the wireless transmission emulation is probably slower than the real time.

[oranresearcher]

Thanks for the response, this could indeed explain it.