TCP throughput - overhead?

[Szilveszter Nadas]

Hi,

What overhead is included in the TCP throughput?

iperf -s -i1 -Z cubic -p 6000 -f m -y C

20220520144041,10.0.0.50,6000,10.0.0.7,30001,4,61.0-62.0,1914256,15314048
20220520144041,10.0.0.50,6000,10.0.0.7,30009,19,61.0-62.0,1908464,15267712
20220520144041,10.0.0.50,6000,10.0.0.7,30006,14,61.0-62.0,1989552,15916416
20220520144041,10.0.0.50,6000,10.0.0.7,30005,10,61.0-62.0,1953352,15626816
20220520144041,10.0.0.50,6000,10.0.0.7,30007,17,61.0-62.0,1875160,15001280
20220520144041,10.0.0.50,6000,10.0.0.7,30002,12,61.0-62.0,1927288,15418304
20220520144041,10.0.0.50,6000,10.0.0.7,30000,5,61.0-62.0,1930184,15441472
20220520144041,10.0.0.50,6000,10.0.0.7,30004,7,61.0-62.0,1985208,15881664
20220520144041,10.0.0.50,6000,10.0.0.7,30003,8,61.0-62.0,1912808,15302464
20220520144041,10.0.0.50,6000,10.0.0.7,30008,18,61.0-62.0,1934528,15476224
20220520144041,,,,,0,61.0-62.0,19330800,154646400

E.g. in these lines the last number is tcp throughput. Does it include any
TCP/IP/Ethernet headers? Can I configure what to include and what not?

Cheers,
Szilveszter

[Robert McMahon]

It does not include the overhead associated with protocol layer headers. It's the socket level reads and writes only.

[Szilveszter Nadas]

Thanks. I propose to add this to the documentation/man page.

[Robert McMahon]

I added some info to the man page. Commit is here.