Hello Wittawat,
You could try sysctl -w to set up big buffer for both send and recv, for
example:
net.ipv4.tcp_rmem = "4096 87380 4149248"
net.ipv4.tcp_wmem = "4096 87380 4149248"
And please try multiple streams test instead of 1, like iperf you might see
1.2GB/s or above.
Good luck!
Shirley
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