Linux常用命令iperf命令可以用来测试一些网络设备如路由器，防火墙，交换机等的性能
1. 安装
yum install -y iperf2. 格式及常用参数：
iperf[参数]
-l 设置读写缓冲区的长度
-p 设置端口，与服务器端的监听端口一致
-o 重定向输出到指定文件
-t 设置传输的总时间
-v 显示版本信息和编译信息并退出基本输出格式如下所示：
$ iperf --help
Usage: iperf [-s|-c host] [options]
iperf [-h|--help] [-v|--version]
Client/Server:
-b, --bandwidth #[kmgKMG | pps] bandwidth to send at in bits/sec or packets per second
-e, --enhancedreports use enhanced reporting giving more tcp/udp and traffic information
-f, --format [kmgKMG] format to report: Kbits, Mbits, KBytes, MBytes
-i, --interval # seconds between periodic bandwidth reports
-l, --len #[kmKM] length of buffer in bytes to read or write (Defaults: TCP=128K, v4 UDP=1470, v6 UDP=1450)
-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
--udp-counters-64bit use 64 bit sequence numbers with UDP
-w, --window #[KM] TCP window size (socket buffer size)
-z, --realtime request realtime scheduler
-B, --bind <host>[:<port>][%<dev>] bind to <host>, ip addr (including multicast address) and optional port and device
-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
-S, --tos # set the socket's IP_TOS (byte) field
Server specific:
-s, --server run in server mode
-t, --time # time in seconds to listen for new connections as well as to receive traffic (default not set)
--udp-histogram #,# enable UDP latency histogram(s) with bin width and count, e.g. 1,1000=1(ms),1000(bins)
-B, --bind <ip>[%<dev>] bind to multicast address and optional device
-H, --ssm-host <ip> set the SSM source, use with -B for (S,G)
-U, --single_udp run in single threaded UDP mode
-D, --daemon run the server as a daemon
-V, --ipv6_domain Enable IPv6 reception by setting the domain and socket to AF_INET6 (Can receive on both IPv4 and IPv6)
Client specific:
-c, --client <host> run in client mode, connecting to <host>
-d, --dualtest Do a bidirectional test simultaneously
--ipg set the the interpacket gap (milliseconds) for packets within an isochronous frame
--isochronous <frames-per-second>:<mean>,<stddev> send traffic in bursts (frames - emulate video traffic)
-n, --num #[kmgKMG] 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)
-B, --bind [<ip> | <ip:port>] bind ip (and optional port) from which to source traffic
-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 receive bidirectional tests back on
-P, --parallel # number of parallel client threads to run
-R, --reverse reverse the test (client receives, server sends)
-T, --ttl # time-to-live, for multicast (default 1)
-V, --ipv6_domain Set the domain to IPv6 (send packets over IPv6)
-X, --peer-detect perform server version detection and version exchange
-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
[kmgKMG] Indicates options that support a k,m,g,K,M or G suffix
Lowercase format characters are 10^3 based and uppercase are 2^n based
(e.g. 1k = 1000, 1K = 1024, 1m = 1,000,000 and 1M = 1,048,576)
The TCP window size option can be set by the environment variable
TCP_WINDOW_SIZE. Most other options can be set by an environment variable
IPERF_<long option name>, such as IPERF_BANDWIDTH.
3. 参考实例
-
udp模式下，客户端同时向服务器端发起30个连接线程，以5Mbps为数据发送速率：
[root@linux ~]#iperf -c 192.168.1.1 -u -b 5M -d -P 30 -
在tcp模式下，客户端到服务器192.168.1.1上传带宽测试，测试时间为60秒：
[root@linux ~]#iperf -c 192.168.1.1 -t 60 -
将 Iperf 启动为 server 模式：
[root@linux ~]#iperf -s -
使用服务端和客户端的默认设置进行测试：
[root@linux ~]# iperf -s -w 300K -
测试双向的传输 :
[root@linux ~]# iperf -c 59.128.103.56 -f K -i 2 -w 300K –u