Inconsitent speed

[oguztudo]

Hey everybody, when i use the gNB with my phone i get results that vary a loooot.
With iperf i never manage to get past 50Mbits. Somehow using an internet speed test will result in higher Numbers. I even managed to go past 100Mbits. This number can drop to 40Mbits in the next test. I testetd with regular wifi and with my pc connected via ethernet and both give me constant results. I also got to mention that my pc's internet connection is way past 500Mbits for UL and DL so this couldnt be a bottleneck. As for cpu usage: i am not even close to use the processors on full power.
The performance script is activated though.

Maybe some of you encountered the same issue and could provide help to to get constant results.

[gustavobsch]

I have similar inconsistencies, been wondering why it does that. I have a b210 and one test I reach 72mbit and then the next one 37mb. I think the problem may be related to using my laptop as gNB because I have other apps open and they might be generating interrupts, seems like gnb its very sensitive to cpu interrupts

[oguztudo]

By Core network you mean just running iperf on a console in the host machine?

If so i did that but my results were slower than the achievable max with speed tests...

[herlesupreeth]

By Core Network I mean the following

I am assuming a setup with open5gs

1. For testing DL throughput, running a iPerf server in UPF and iPerf client on the phone
2. For testing DL throughput, running a iPerf client in UPF and iPerf server on the phone

[oguztudo]

Thanks for the info!
Maybe im asking the obvious here but how am i able to start iperf in the upf?

[herlesupreeth]

if you want to start the server its iperf -s -u -i 1

For iperf client iperf -u -c <IPERF_SERVER_IP> -t <TIME_TO_RUN_IPERF_TEST> -b <MAX_RATE_TO_TEST> -i 1

e.g. (assuming iPerf server is running on a machine with IP 192.168.100.2, test for 20 seconds, 150Mbps max rate)

iperf -s -u -i 1
iperf -u -c 192.168.100.2 -t 20 -b 150M -i 1

[oguztudo]

Thanks for the quick reply!

Oh i that is what i was doing. I thought there are extra steps necessary to start the iperf inside of the upf (for example an extra command the iperf to upf). As far as i know the main traffic goes through the upf anyway.

[herlesupreeth]

Ah I see. So you are saying with iPerf there was inconsistent throughput??

[ismagom]

To achieve best speed, try first with iperf UDP. then in the console type t and you will see the trace printed. That's useful to debug. Can you paste the output of that here? Additionally, logs in info level are also useful