使用iPerf测试网络吞吐量

不念不忘少年蓝@ 2022-10-16 08:44 484阅读 0赞

> 在测试网络吞吐量时，我们常见的方式都是通过远程拷贝一个文件来大致验证网络吞吐量，但是这种方式可能会受到磁盘自身吞吐量影响，所以我们采取 iperf 命令行工具可以避开受到其他因素影响。该工具可以在Linux 和 Windows 下通用。

### 一、iPerf 工具下载 ###

*  CentOS 安装

# CentOS默认 yum 源没有iperf，epel yum 源库中存在
    yum install epel-release
    yum update
    yum install iperf

*  Windows 安装 （直接在官方网站下载即可）

https://iperf.fr/iperf-download.php

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI1ODU0MDU3_size_16_color_FFFFFF_t_70]

### 二、iPerf 工具使用 ###

iPerf 需要两台机器，一台充当客户端，一台充当服务端。客户端连接上服务测试。

##### 1、TCP 服务端客户端测试 #####

*  在第一台机器上以服务端模式启动

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

*  在第二台机器上以客户端方式连接测试

# iperf3 -c 192.168.6.160
    Connecting to host 192.168.6.160, port 5201
    [  4] local 192.168.1.192 port 20886 connected to 192.168.6.160 port 5201
    [ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
    [  4]   0.00-1.00   sec  7.63 MBytes  64.0 Mbits/sec   56   32.5 KBytes       
    [  4]   1.00-2.00   sec  8.26 MBytes  69.3 Mbits/sec   22   39.6 KBytes       
    [  4]   2.00-3.00   sec  7.52 MBytes  63.1 Mbits/sec   35   29.7 KBytes       
     ......      
    - - - - - - - - - - - - - - - - - - - - - - - - -
    [ ID] Interval           Transfer     Bandwidth       Retr
    [  4]   0.00-10.00  sec  71.6 MBytes  60.0 Mbits/sec  430             sender
    [  4]   0.00-10.00  sec  71.3 MBytes  59.8 Mbits/sec                  receiver
    
    iperf Done.

##### 2、UDP 服务端客户端测试 #####

*  服务端依旧加 -s 启动，客户端加上 -u 参数代表使用udp协议，可以测试使用 udp 连接能实现的最大吞吐量

# 加上 -u 参数可以
    # iperf3 -c 192.168.6.160 -u 
    Connecting to host 192.168.6.160, port 5201
    [  4] local 192.168.1.192 port 38898 connected to 192.168.6.160 port 5201
    [ ID] Interval           Transfer     Bandwidth       Total Datagrams
    [  4]   0.00-1.00   sec   116 KBytes   950 Kbits/sec  82  
    [  4]   1.00-2.00   sec   129 KBytes  1.05 Mbits/sec  91  
    [  4]   2.00-3.00   sec   127 KBytes  1.04 Mbits/sec  90  
    ......
    - - - - - - - - - - - - - - - - - - - - - - - - -
    [ ID] Interval           Transfer     Bandwidth       Jitter    Lost/Total Datagrams
    [  4]   0.00-10.00  sec  1.24 MBytes  1.04 Mbits/sec  0.289 ms  1/897 (0.11%)  
    [  4] Sent 897 datagrams
    
    iperf Done.

1.05Mbits/sec远低于TCP测试中观察到的值，这是因为默认情况下，iperf 对UDP带宽限制为每秒1 Mbits/sec。如果需要测试UDP网络速度，可以加 -b 参数设置带宽，将数字设置为双方硬件设置端口的最大带宽限制。

# iperf3 -c 192.168.6.160 -u -b 100m
    Connecting to host 192.168.6.160, port 5201
    [  4] local 192.168.1.192 port 63338 connected to 192.168.6.160 port 5201
    [ ID] Interval           Transfer     Bandwidth       Total Datagrams
    [  4]   0.00-1.00   sec  10.3 MBytes  86.6 Mbits/sec  7479  
    [  4]   1.00-2.00   sec  11.4 MBytes  95.6 Mbits/sec  8253  
    [  4]   2.00-3.00   sec  11.4 MBytes  95.6 Mbits/sec  8254  
    ......
    - - - - - - - - - - - - - - - - - - - - - - - - -
    [ ID] Interval           Transfer     Bandwidth       Jitter    Lost/Total Datagrams
    [  4]   0.00-10.00  sec   113 MBytes  94.6 Mbits/sec  0.016 ms  1346/81703 (1.6%)  
    [  4] Sent 81703 datagrams
    
    iperf Done.

##### 3、Windows 使用 #####

Windows 也是基于命令行使用，可以跟Linux混合测试，使用方式一致。从官网下载好的文件解压放进 C:\\Windows 即可。  
![在这里插入图片描述][20210604114340745.png]

### 三、iPerf 参数选项 ###

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
      -B, --bind      <host>    bind to a specific interface
      -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
      -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
      -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)
      -n, --bytes     #[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)
      --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
      -M, --set-mss   #         set TCP/SCTP maximum segment size (MTU - 40 bytes)
      -N, --no-delay            set TCP/SCTP 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'
      -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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[20210604114340745.png]: /images/20221014/fa05fde8f7de4cb8ae79923d13cf7059.png