ネットワーク負荷試験ツールiperfの新しいバージョン

RPMforgeリポジトリ を追加してからyumでインストール

# yum install iperf3

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

Server or Client:
  -p, --port      #         server port to listen on/connect to
  -f, --format    [kmgKMG]  format to report: Kbits, Mbits, KBytes, MBytes
  -i, --interval  #         seconds between periodic bandwidth reports
  -F, --file name           xmit/recv the specified file
  -A, --affinity n/n,m      set CPU affinity
  -V, --verbose             more detailed output
  -J, --json                output in JSON format
  -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
Client specific:
  -c, --client    <host>    run in client mode, connecting to <host>
  -u, --udp                 use UDP rather than TCP
  -b, --bandwidth #[KMG][/#] target bandwidth in bits/sec
                            (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)
  -n, --num       #[KMG]    number of bytes to transmit (instead of -t)
  -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)
  -P, --parallel  #         number of parallel client streams to run
  -R, --reverse             run in reverse mode (server sends, client receives)
  -w, --window    #[KMG]    TCP window size (socket buffer size)
  -B, --bind      <host>    bind to a specific interface or multicast address
  -C, --linux-congestion <algo>  set TCP congestion control algorithm (Linux only)
  -M, --set-mss   #         set TCP maximum segment size (MTU - 40 bytes)
  -N, --nodelay             set TCP no delay, disabling Nagle's Algorithm
  -4, --version4            only use IPv4
  -6, --version6            only use IPv6
  -S, --tos N               set the IP 'type of service'
  -L, --flowlabel N         set the IPv6 flow label (only supported on Linux)
  -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

[KMG] indicates options that support a K/M/G suffix for kilo-, mega-, or giga-
Report bugs to <iperf-users@lists.sourceforge.net>

iperf3 -s

iperf3 -c [server ip]

例: parallel:2, time:10, bandwidth:1G UDP

iperf3 -c [server ip] -P 2 -t 10 -b 1G -u

Retrを見ると再送が多くて、ネットワーク品質が安定しない事が分かる

# iperf3 -c 192.168.10.10 -t 10 
Connecting to host 192.168.10.140, port 5201
[  5] local 192.168.10.101 port 36110 connected to 192.168.10.10 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  1.15 GBytes  9.90 Gbits/sec   18   2.91 MBytes       
[  5]   1.00-2.00   sec  1.15 GBytes  9.91 Gbits/sec   31   3.64 MBytes       
[  5]   2.00-3.00   sec  1.14 GBytes  9.82 Gbits/sec    0   4.10 MBytes       
[  5]   3.00-4.00   sec  1.15 GBytes  9.88 Gbits/sec   26   3.91 MBytes       
[  5]   4.00-5.00   sec  1.15 GBytes  9.84 Gbits/sec    0   4.83 MBytes       
[  5]   5.00-6.00   sec  1.14 GBytes  9.76 Gbits/sec   37   3.12 MBytes       
[  5]   6.00-7.00   sec  1.15 GBytes  9.83 Gbits/sec    0   4.54 MBytes       
[  5]   7.00-8.00   sec  1.15 GBytes  9.89 Gbits/sec   24   4.36 MBytes       
[  5]   8.00-9.00   sec  1.15 GBytes  9.88 Gbits/sec    0   4.36 MBytes       
[  5]   9.00-10.00  sec  1.14 GBytes  9.78 Gbits/sec   35   2.24 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  11.5 GBytes  9.85 Gbits/sec  171             sender
[  5]   0.00-10.04  sec  11.5 GBytes  9.80 Gbits/sec                  receiver

iperf Done.