iperf3ʹÓüǼ

yum install -y iperf3

Server or Client:
  -p, --port      #         server port to listen on/connect to
  -f, --format   [kmgtKMGT] format to report: Kbits, Mbits, Gbits, Tbits
  -i, --interval  #         seconds between periodic throughput reports
  -F, --file name           xmit/recv the specified file
  -A, --affinity n/n,m      set CPU affinity
  -B, --bind      <host>    bind to the interface associated with the address <host>
Server specific:
  -s, --server              run in server mode
Client specific:
  -c, --client    <host>    run in client mode, connecting to <host>
  -u, --udp                 use UDP rather than TCP
  -t, --time      #         time in seconds to transmit for (default 10 secs)
  -l, --length    #[KMG]    length of buffer to read or write
                            (default 128 KB for TCP, dynamic or 1460 for UDP)
  -P, --parallel  #         number of parallel client streams to run
  -R, --reverse             run in reverse mode (server sends, client receives)

  -4, --version4            only use IPv4
  --get-server-output       get results from server

# iperf3 -s    
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------

# iperf3 -c host1 -f m -i 1 -t 5 -P 1 -4 --get-server-output
Connecting to host host1, port 5201
[  5] local host2 port 53270 connected to host1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   497 MBytes  4165 Mbits/sec    0   1.77 MBytes       
[  5]   1.00-2.00   sec   494 MBytes  4151 Mbits/sec    0   2.07 MBytes       
[  5]   2.00-3.00   sec   501 MBytes  4203 Mbits/sec    0   2.07 MBytes       
[  5]   3.00-4.00   sec   486 MBytes  4074 Mbits/sec    0   2.07 MBytes       
[  5]   4.00-5.00   sec   499 MBytes  4197 Mbits/sec    0   2.07 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-5.00   sec  2.42 GBytes  4158 Mbits/sec    0             sender
[  5]   0.00-5.00   sec  2.42 GBytes  4156 Mbits/sec                  receiver

Server output:
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
Accepted connection from host2, port 53268
[  5] local host1 port 5201 connected to host2 port 53270
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec   496 MBytes  4.16 Gbits/sec                  
[  5]   1.00-2.00   sec   494 MBytes  4.15 Gbits/sec                  
[  5]   2.00-3.00   sec   501 MBytes  4.21 Gbits/sec                  
[  5]   3.00-4.00   sec   486 MBytes  4.08 Gbits/sec                  
[  5]   4.00-5.00   sec   500 MBytes  4.19 Gbits/sec                  
[  5]   5.00-5.00   sec   252 KBytes  4.08 Gbits/sec                  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-5.00   sec  2.42 GBytes  4.16 Gbits/sec                  receiver


iperf Done.

tcpdump -ttt -n -i eth1 -s 0 host aaa and host bbb and tcp -w s.pcap
tcpdump -t -nn -r s.pcap  | grep -v ', length 0' | awk '{sum += $NF; count++} END {print sum/count}'