背景
調試需要知道兩端是否達到千兆網速，跑個測試最直觀。
方法
需要兩台設備，都安裝iperf工具。
服務端
$ iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 128 KByte (default)
------------------------------------------------------------
客戶端
$ iperf -c 10.0.1.33
------------------------------------------------------------
Client connecting to 10.0.1.33, TCP port 5001
TCP window size: 65.0 KByte (WARNING: requested 64.0 KByte)
------------------------------------------------------------
[ 1] local 10.0.1.9 port 58847 connected with 10.0.1.33 port 5001
[ ID] Interval Transfer Bandwidth
[ 1] 0.00-10.02 sec 96.4 MBytes 80.7 Mbits/sec