Thursday, March 4, 2021

iperf3 results different on Windows and Linux

I recently bought a couple of Realtek based USB 3.0 to 2.5GbE adapters. Since I don't yet have a 2.5GbE switch, I thought I'd test them using a PC to PC direct connection.

Two modern Windows 10 laptops showed a TCP speed of 1.8-ish Gbps with 1/2/4 streams. Booting them using Ubuntu LiveUSB sticks got me 2.35Gbps which all the online reviewers seem to be getting.

I then tried it using various combinations of laptops and desktops but the results are pretty similar. CPU cores are not being saturated.

Any ideas why will be greatly appreciated

Thanks.



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