作用：基于TCP或UDP，对网络带宽吞吐量进行测试
安装：yum install iperf3 -y
服务端参数：
-s：表示启动服务端
-i：表示打印报告的时间间隔
-p：指定监听端口，默认为5201
-D：以后台方式运行(默认是前台运行，将测试结果打印在屏幕)
用法示例：iperf3 -s -i 1 -p 10000
客户端参数：
-c：表示启动客户端，后边跟上服务端IP
-b：指定目标的最大带宽(用ethtool 网卡名字可以查看)
-t：指定测试时间
-P：指定并发数
-p：指明服务端启动的端口
-R：逆向测试
-d：双向测试
用法示例：iperf3 -c 192.168.0.30 -b 1G -t 5 -P 2 -p 10000
举例说明：
#启动服务端
[[emailprotected]~]#iperf3-s-i1-p10000
-----------------------------------------------------------
Serverlisteningon10000
-----------------------------------------------------------
Acceptedconnectionfrom192.168.10.121,port40322
[5]local192.168.10.122port10000connectedto192.168.10.121port40324
[ID]IntervalTransferBandwidth
[5]0.00-1.00sec110MBytes926Mbits/sec
[5]1.00-2.00sec121MBytes1.02Gbits/sec
[5]2.00-3.00sec117MBytes980Mbits/sec
[5]3.00-4.00sec119MBytes997Mbits/sec
[5]4.00-5.00sec120MBytes1.01Gbits/sec
[5]5.00-5.00sec0.00Bytes0.00bits/sec
-------------------------
[ID]IntervalTransferBandwidth
[5]0.00-5.00sec0.00Bytes0.00bits/secsender
[5]0.00-5.00sec587MBytes984Mbits/secreceiver#启动客户端
[[emailprotected]~]#iperf3-c192.168.10.122-t5-b1G-P1-p10000-R
Connectingtohost192.168.10.122,port10000
Reversemode,remotehost192.168.10.122issending
[4]local192.168.10.121port40328connectedto192.168.10.122port10000
[ID]IntervalTransferBandwidth
[4]0.00-1.00sec108MBytes909Mbits/sec
[4]1.00-2.00sec122MBytes1.02Gbits/sec
[4]2.00-3.00sec118MBytes992Mbits/sec
[4]3.00-4.00sec119MBytes999Mbits/sec
[4]4.00-5.00sec120MBytes1.00Gbits/sec
-------------------------
[ID]IntervalTransferBandwidthRetr
[4]0.00-5.00sec587MBytes985Mbits/sec0sender
[4]0.00-5.00sec587MBytes985Mbits/secreceiver
可以看到发送方和接收方的Bandwidth(带宽)大概都是985M/s，很接近网卡的1000M/s；
