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From:

https://www.mankier.com/1/iperf3#--length

I can only see:

length of buffer to read or write. For TCP tests, the default value is 128KB.

Q: But what sizes do iperf use to test the connection between the nodes? Cannot find any DOC about it.

HolcombSimons
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2 Answers2

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Try running the iperf3 client and/or server with these options --json --logfile output.json --forceflush. That file may confirm the default values you are using.

Best regards, Sebastian

Dharman
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Sebastian Luna-Valero
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iperf3 message/packet length is specified using the -l parameter. You can view the size used using the -V (verbose) parameter. iperf3 will print a message starting with "Starting Test: ..." that shows the "byte blocks" size of the packets.

David Bar-On
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