Linux下简单限制网卡的带宽[原创]

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2008-11-20 16:56 | by 张宴 ]

　　[文章作者：张宴本文版本：v1.0 最后修改：2008.11.20 转载请注明原文链接：http://blog.s135.com/post/380/]

　　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访问效果。

　　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

　　下载速度为457K/s，限制效果达到。

　　4、解除eth0网卡的带宽限制：

/sbin/tc qdisc del dev eth0 root tbf

　　5、对比：未作带宽限制情况下，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]

　　下载速度为6.16MB/s。

Tags: linux , tc , 带宽

技术大类 » 其他Unix技术 | 评论(7) | 引用(0) | 阅读(11648)

gengmao

2008-11-20 18:25

限制带宽为50kbit后, 为什么下载速度达到457K/s?

张宴回复于 2008-11-20 18:35

Linux内核依靠粗糙的计时信息进行带宽固定。在一个较长的时间段内，可以维持很好的精度，但是在以秒为单位进行计量的时间段内，其结果非常不准确。
所以，实际使用的带宽需要以wget下载时速度为准，去调整tc的带宽限制。

tengcy

2008-11-20 19:08

单位搞错了，应该是50Mbit。。。

jacket

2008-11-22 03:35

做下载站可以用这个方法了

这个方法很耗CPU吗？

xi2008wang

2008-11-23 16:44

前几天,正好用了windows下面的网络带宽限制软件. 也是用于模拟外网

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