linux 带宽测试doc note

#### 如何进行linux带宽测试
5. how to test NetWidth :
    ###
    5.1 method1 to see (https://blog.csdn.net/Deronn/article/details/86682715):
    1.从github克隆包到本地
    # git clone https://github.com/sivel/speedtest-cli.git
    2.执行speedtest这个python脚本
    python speedtest.py
    ####

    5.2 method2 python test like following (#todo Suggest you use this!!!):
    安装命令：
        wget -O speedtest-cli https://raw.githubusercontent.com/sivel/speedtest-cli/master/speedtest.py
        chmod a+x speedtest-cli
    运行命令：
        ./speedtest-cli

    ##
    5.3 method3,环境CentOS7_x86_64:(https://blog.51cto.com/13718210/2418661)
    a. 测试网络带宽常用命令(包含安装使用)
    yum  -y install  iperf
    b. 测试时记得关闭防火墙或者自行配置防火墙规则，为了快速测试，这里就直接关闭防火墙
    systemctl stop  firewalld
    c. 安装完iperf后，在Server端执行
    #todo[root@110_152 ~]   iperf   -s -i 1 -f  m
    -s表示server，-i表示显示时间间隔，-f表示显示格式化的单位
    打开第二台linux 作为client端，安装iperf执行:
    #todo[root@110_152 ~]  iperf -c host_server_ip -i 1 -t 30 -f m
    -c表示客户端，后面接server的地址，-t代表运行的时间
    #todo [root@110_152 ~]# iperf -c 192.168.110.151 -i 1 -t 30 -f m
    ------------------------------------------------------------
    Client connecting to 192.168.110.151, TCP port 5001
    TCP window size: 0.18 MByte (default)
    ------------------------------------------------------------
    [  3] local 192.168.110.152 port 50372 connected with 192.168.110.151 port 5001
    [ ID] Interval       Transfer     Bandwidth
    [  3]  0.0- 1.0 sec   256 MBytes  2149 Mbits/sec
    [  3]  1.0- 2.0 sec   277 MBytes  2325 Mbits/sec
    [  3]  2.0- 3.0 sec   343 MBytes  2875 Mbits/sec
    [  3]  3.0- 4.0 sec   394 MBytes  3308 Mbits/sec
    [  3]  4.0- 5.0 sec   486 MBytes  4077 Mbits/sec
    #todo server 端 bandWidth:
    Server listening on TCP port 5001
    TCP window size: 0.08 MByte (default)
    ------------------------------------------------------------
    [  4] local 192.168.110.151 port 5001 connected with 192.168.110.152 port 50372
    [ ID] Interval       Transfer     Bandwidth
    [  4]  0.0- 1.0 sec   256 MBytes  2145 Mbits/sec
    [  4]  1.0- 2.0 sec   277 MBytes  2325 Mbits/sec
    [  4]  2.0- 3.0 sec   343 MBytes  2876 Mbits/sec
    [  4]  3.0- 4.0 sec   397 MBytes  3330 Mbits/sec
    [  4]  4.0- 5.0 sec   480 MBytes  4027 Mbits/sec
    [  4]  5.0- 6.0 sec   324 MBytes  2721 Mbits/sec
    [  4]  6.0- 7.0 sec   378 MBytes  3173 Mbits/sec
    [  4]  7.0- 8.0 sec   292 MBytes  2447 Mbits/sec
    [  4]  8.0- 9.0 sec   285 MBytes  2393 Mbits/sec
    [  4]  9.0-10.0 sec   537 MBytes  4504 Mbits/sec
    [  4] 10.0-11.0 sec   292 MBytes  2453 Mbits/sec
    [  4] 11.0-12.0 sec   399 MBytes  3347 Mbits/sec



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