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          1. Linux下简单限制网卡的带宽

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              Linux下限制网卡的带宽  ,可用来模拟服务器带宽耗尽  ,从而测试服务器在此时的会见效果  。

                1、安装iproute

              yum -y install iproute
              2、限制eth0网卡的带宽为50kbit:

              /sbin/tc qdisc add dev eth0 root tbf rate 50kbit latency 50ms burst 1000


              3、限制带宽为50kbit后  ,在百兆局域网中wget下载一个大文件:

              [root@localhost ~]# wget http://192.168.1.7/test.zip
              --19:40:27-- http://192.168.1.7/test.zip
              Connecting to 192.168.1.7:80... connected.
              HTTP request sent, awaiting response... 200 OK
              Length: 23862312 (23M) [application/zip]
              Saving to: `test.zip'

              37% [=======> ] 8,994,816 457K/s eta 27s


              下载速率为457K/s  ,限制效果到达 。

                4、排除eth0网卡的带脱期制:

              /sbin/tc qdisc del dev eth0 root tbf


              5、对比:未作带脱期制情形下  ,在百兆局域网中wget下载一个大文件:

              [root@localhost ~]# wget http://192.168.1.7/test.zip
              --19:44:33-- http://192.168.1.7/test.zip
              Connecting to 192.168.1.7:80... connected.
              HTTP request sent, awaiting response... 200 OK
              Length: 23862312 (23M) [application/zip]
              Saving to: `test.zip'

              100%[==========>] 23,862,312 6.14M/s in 3.7s

              19:44:36 (6.16 MB/s) - `test.zip' saved [23862312/23862312]


              下载速率为6.16MB/s  。

              http://blog.s135.com/post/380.htma