[root@localhost ]# yum search iperf 已加载插件：fastestmirror Loading mirror speeds from cached hostfile   * base: mirrors.tuna.tsinghua.edu.cn  * extras: mirrors.huaweicloud.com  * updates: mirrors.tuna.tsinghua.edu.cn ==================================================================== N/S matched: iperf ==================================================================== iperf3-devel.i686 : Development files for iperf3 iperf3-devel.x86_64 : Development files for iperf3 iperf3.i686 : Measurement tool for TCP/UDP bandwidth performance iperf3.x86_64 : Measurement tool for TCP/UDP bandwidth performance    名称和简介匹配 only，使用“search all”试试。 [root@localhost ]# [root@localhost ]# yum install iperf3 已加载插件：fastestmirror Loading mirror speeds from cached hostfile  * base: mirrors.tuna.tsinghua.edu.cn  * extras: mirrors.huaweicloud.com  * updates: mirrors.tuna.tsinghua.edu.cn 正在解决依赖关系 --> 正在检查事务 ---> 软件包 iperf3.x86_64.0.3.1.7-2.el7 将被 安装 --> 解决依赖关系完成  依赖关系解决  ============================================================================================================================================================  Package                             架构                                版本                                       源                                 大小 ============================================================================================================================================================ 正在安装:  iperf3                              x86_64                              3.1.7-2.el7                                base                               79 k  事务概要 ============================================================================================================================================================ 安装  1 软件包  总下载量：79 k 安装大小：197 k Is this ok [y/d/N]: y Downloading packages: iperf3-3.1.7-2.el7.x86_64.rpm                                                                                                        |  79 kB  00:00:00 Running transaction check Running transaction test Transaction test succeeded Running transaction   正在安装    : iperf3-3.1.7-2.el7.x86_64                                                                                                               1/1   验证中      : iperf3-3.1.7-2.el7.x86_64                                                                                                               1/1  已安装:   iperf3.x86_64 0:3.1.7-2.el7  完毕！ [root@localhost ]# iperf3 -v iperf 3.1.7 Linux localhost 3.10.0-1160.71.1.el7.x86_64 #1 SMP Tue Jun 28 15:37:28 UTC 2022 x86_64 Optional features available: CPU affinity setting, IPv6 flow label, TCP congestion algorithm setting, sendfile / zerocopy, socket pacing [root@localhost ]# [root@localhost ]# iperf3 -h 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   -B, --bind          bind to a specific interface   -V, --verbose             more detailed output   -J, --json                output in JSON format   --logfile f               send output to a log file   --forceflush              force flushing output at every interval   -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        run in client mode, connecting to    -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)   --fq-rate #[KMG]          enable fair-queuing based socket pacing in                             bits/sec (Linux only)   -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, dynamic or 1 for UDP)   --cport             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   -C, --congestion    set TCP congestion control algorithm (Linux and FreeBSD only)   -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'   -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   --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 [root@localhost ]# 

iperf官网地址：

iPerf - The TCP, UDP and SCTP network bandwidth measurement tool

iperf特性：

测量带宽

报告MSS/MTU大小和观察到的读数大小。

通过套接字缓冲区支持TCP窗口大小。

UDP

客户端可以创建指定带宽的UDP流。

测量数据包丢失

测量延迟抖动

支持多播

跨平台：Windows、Linux、Android、MacOS X、FreeBSD、OpenBSD、NetBSD、VxWorks、Solaris，。。。

客户端和服务器可以同时具有多个连接（-P选项）。

服务器处理多个连接，而不是在一次测试后退出。

可以运行指定的时间（-t选项），而不是要传输的数据量（-n或-k选项）。

以指定的间隔打印周期性、中间带宽、抖动和损耗报告（-i选项）。

将服务器作为守护程序运行（-D选项）

使用具有代表性的流来测试链路层压缩如何影响可实现的带宽（-F选项）。

服务器同时接受单个客户端（iPerf3）多个客户端同时接受（iPerf2）