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====== iperf3 ======
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Usage: iperf [-s|-c host] [options]
       iperf [-h|--help] [-v|--version]

Server or Client:
  -p, --port      #         server port to listen on/connect to
                            指定服務器端使用的端口或客戶端所連接的端口eg:iperf -s -p 9999;iperf -c 222.35.11.23 -p 9999
  -f, --format    [kmgKMG]  format to report: Kbits, Mbits, KBytes, MBytes
                            分別表示以Kbits, Mbits, KBytes, MBytes顯示報告，預設以Mbits為單位
                            eg:iperf -c 222.35.11.23 -f K
  -i, --interval  #         seconds between periodic bandwidth reports
                            以秒為單位顯示報告間隔，
                            eg:iperf -c 222.35.11.23 -i 2)
  -F, --file name           xmit/recv the specified file
  -B, --bind      <host>    bind to a specific interface
                            綁定一個主機地址或通訊埠（當主機有多個地址或通訊埠時使用該參數）
  -V, --verbose             more detailed output
  -J, --json                output in JSON format
  --logfile f               send output to a log file
  -d, --debug               emit debugging output
  -v, --version             show version information and quit
  -h, --help                show this message and quit
Server specific:
  -s, --server              run in server mode
  -D, --daemon              run the server as a daemon
                            以服務方式運行ipserf，eg:iperf -s -D
  -I, --pidfile file        write PID file
  -1, --one-off             handle one client connection then exit
Client specific:
  -c, --client    <host>    run in client mode, connecting to <host>
  -u, --udp                 use UDP rather than TCP
                            用udp協議
  -b, --bandwidth #[KMG][/#] target bandwidth in bits/sec (0 for unlimited)
                            (default 1 Mbit/sec for UDP, unlimited for TCP)
                            (optional slash and packet count for burst mode)
  -t, --time      #         time in seconds to transmit for (default 10 secs)
                            測試時間，預設10秒,eg: iperf -c 222.35.11.23 -t 5
  -n, --bytes     #[KMG]    number of bytes to transmit (instead of -t)
                            指定傳輸的位元組數，eg: iperf -c 222.35.11.23 -n 100000
  -k, --blockcount #[KMG]   number of blocks (packets) to transmit (instead of -t or -n)
  -l, --len       #[KMG]    length of buffer to read or write
                            (default 128 KB for TCP, 8 KB for UDP)
                            緩衝區大小，預設是8KB,eg:iperf -c 222.35.11.23 -l 16
  --cport         <port>    bind to a specific client port (TCP and UDP, default: ephemeral port)
  -P, --parallel  #         number of parallel client streams to run
  -R, --reverse             run in reverse mode (server sends, client receives)
  -w, --window    #[KMG]    set window size / socket buffer size
                            指定TCP窗口大小，預設是8KB
  -M, --set-mss   #         set TCP/SCTP maximum segment size (MTU - 40 bytes)
                            設定TCP資料封包的最大mtu值
  -N, --no-delay            set TCP/SCTP no delay, disabling Nagle's Algorithm
                            設定TCP不延時
  -4, --version4            only use IPv4
  -6, --version6            only use IPv6
  -S, --tos N               set the IP 'type of service'
  -Z, --zerocopy            use a 'zero copy' method of sending data
  -O, --omit N              omit the first n seconds
  -T, --title str           prefix every output line with this string
  --get-server-output       get results from server
  --udp-counters-64bit      use 64-bit counters in UDP test packets

[KMG] indicates options that support a K/M/G suffix for kilo-, mega-, or giga-

iperf3 homepage at: http://software.es.net/iperf/
Report bugs to:     https://github.com/esnet/iperf
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