Thanks to click!
I want to install iperf3.1 on raspberry pi.
" page do not support iperf3 above 3.1 version for ARM core.
Because raspberry pi has ARM core, It do not use iperf3 of i386 or amd 64.
I tried to use lots of way to install iperf3.1 on raspbeery pi.
Using source code of above version 3.1 and making compile show error.
and using "apt install iperf3" only install iperf3 below version 3.1 on raspberry pi.
Is there another way to install iperf3.1 on rapsberry-pi?