Iperf tool cannot set one larger socket buffer

Asked Apr 21 '20 at 06:35

Active Jan 13 '22 at 14:53

Viewed 6,353 times

Recently I try Iperf3 to test our system's throughput. I want to set tcp's window size to 2M, but failed.

iperf3 -c 135.242.61.60 -w 2M

Connecting to host 135.242.61.60, port 5201

iperf3: error - socket buffer size not set correctly

I check iperf3's source code, and find out that iperf3 will setsockopt with parameter 2M and then getsockopt to verify the paramter. The value getsockopt return is less than 2M. I think maybe there are some limitation in Kernel.

How can I enlarge the tcp window to 2M?

edited Jan 13 '22 at 14:53

Henrique de Sousa

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asked Apr 21 '20 at 06:35

Johnson_linux

I've tested it myself and it worked. This GitHub issue seems to be related to your problem. https://github.com/esnet/iperf/issues/757#issuecomment-401173762 – vkozyrev Apr 21 '20 at 08:00
Please mark the question as answered then – vkozyrev Apr 23 '20 at 05:52

Iperf tool cannot set one larger socket buffer

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