====== 02_ネットワーク負荷試験iperf ======

ネットワークの帯域を計測する便利なツール

<color red>※iperfはUDPでは1Gbitとか大きな帯域だと、想定通りの数値が出ない
tcpでbandwidthを指定せず実行すると想定内の数値が出ます。
</color>

===== インストール =====
[[01_linux:01_net:11_yum_rpmforgeレポジトリ追加|RPMforgeリポジトリ]] を追加してからyumでインストール

<code console>
# yum install iperf
</code>

===== TCP =====

=== サーバ側 ===

<code console>
# iperf -s -p 8080 -i 1
</code>

=== クライアント側 ===

<code console>
# iperf -c 192.168.10.10 -p 8080 -i 1
</code>


===== UDP =====

=== サーバ側 ===

<code console>
# iperf -s -p 8080 -u -i 1
</code>

=== クライアント側 ===

<code console>
# iperf -c 192.168.10.10 -p 8080 -u -b 200M -i 1
</code>

===== オプション一覧 =====

<code>
# iperf --help
Usage: iperf [-s|-c host] [options]
       iperf [-h|--help] [-v|--version]

Client/Server:
  -f, --format    [kmKM]   format to report: Kbits, Mbits, KBytes, MBytes
  -i, --interval  #        seconds between periodic bandwidth reports
  -l, --len       #[KM]    length of buffer to read or write (default 8 KB)
  -m, --print_mss          print TCP maximum segment size (MTU - TCP/IP header)
  -o, --output    <filename> output the report or error message to this specified file
  -p, --port      #        server port to listen on/connect to
  -u, --udp                use UDP rather than TCP
  -w, --window    #[KM]    TCP window size (socket buffer size)
  -B, --bind      <host>   bind to <host>, an interface or multicast address
  -C, --compatibility      for use with older versions does not sent extra msgs
  -M, --mss       #        set TCP maximum segment size (MTU - 40 bytes)
  -N, --nodelay            set TCP no delay, disabling Nagle's Algorithm
  -V, --IPv6Version        Set the domain to IPv6

Server specific:
  -s, --server             run in server mode
  -U, --single_udp         run in single threaded UDP mode
  -D, --daemon             run the server as a daemon

Client specific:
  -b, --bandwidth #[KM]    for UDP, bandwidth to send at in bits/sec
                           (default 1 Mbit/sec, implies -u)
  -c, --client    <host>   run in client mode, connecting to <host>
  -d, --dualtest           Do a bidirectional test simultaneously
  -n, --num       #[KM]    number of bytes to transmit (instead of -t)
  -r, --tradeoff           Do a bidirectional test individually
  -t, --time      #        time in seconds to transmit for (default 10 secs)
  -F, --fileinput <name>   input the data to be transmitted from a file
  -I, --stdin              input the data to be transmitted from stdin
  -L, --listenport #       port to recieve bidirectional tests back on
  -P, --parallel  #        number of parallel client threads to run
  -T, --ttl       #        time-to-live, for multicast (default 1)
  -Z, --linux-congestion <algo>  set TCP congestion control algorithm (Linux only)

Miscellaneous:
  -x, --reportexclude [CDMSV]   exclude C(connection) D(data) M(multicast) S(settings) V(server) reports
  -y, --reportstyle C      report as a Comma-Separated Values
  -h, --help               print this message and quit
  -v, --version            print version information and quit
</code>


===== ロードバランサーを通しての帯域テストの場合 =====

LVSの場合

<code console>
ipvsadm -A -u [ロードバランスIP]:8080 -s wrr
ipvsadm -a -u [ロードバランスIP]:53 -r 10.10.0.10
</code>


ロードバランスと、10.10.0.10で帯域を測ってみる


{{tag>network}}