我们经常买了vps或服务器，机房说给了10Mbps带宽，给了100Mbps带宽，我们怎么知道他是不是有水分呢？ linux下面，有很简单的测试方法，那就是用   wget 下载，一般多下载几个机房的文件观察最大速度，如果能有1.1MB/秒，那么就是没有任何水分的10Mbps独享带宽，能跑满。 如果能有11MB/秒 的下载速度，那就就是没有任何水分的100Mbps独享带宽，能跑满。

这里的10Mbps单位是bit，是和我们电信 adsl 用单位一样。比如我们2M的电信adsl，下载最大就是 2M / 8=256KB每秒

wget下载演示10M带宽效果：

[[email protected]]# wget http://www.wdc01.softlayer.com/downloads/test100.zip

--2010-08-09 12:25:43--  http://www.wdc01.softlayer.com/downloads/test100.zip

Resolving www.wdc01.softlayer.com... 208.43.118.51

Connecting to www.wdc01.softlayer.com|208.43.118.51|:80... connected.

HTTP request sent, awaiting response... 200 OK

Length: 104874307 (100M) [application/zip]

Saving to: `test100.zip'

26% [=======================>                                                                   ] 28,037,373  1.12M/s  eta 70s   

[[email protected]]# wget http://www.softlayer.com/downloads/test100.zip

--2010-08-09 12:26:51--  http://www.softlayer.com/downloads/test100.zip

Resolving www.softlayer.com... 66.228.118.51, 2607:f0d0:1000:11:1::1

Connecting to www.softlayer.com|66.228.118.51|:80... connected.

HTTP request sent, awaiting response... 200 OK

Length: 104874307 (100M) [application/zip]

Saving to: `test100.zip.1'

 3% [==>                                                                                        ] 3,634,480   1.11M/s  eta 90s   

[[email protected]]# wget http://184.105.207.135/test.zip

--2010-08-09 12:27:01--  http://184.105.207.135/test.zip

Connecting to 184.105.207.135:80... connected.

HTTP request sent, awaiting response... 200 OK

Length: 104857600 (100M) [application/zip]

Saving to: `test.zip'

 3% [=>                                                                                         ] 3,246,146   1.10M/s              

[[email protected]]# wget http://66.96.192.92/bigtest.tgz

--2010-08-09 12:27:22--  http://66.96.192.92/bigtest.tgz

Connecting to 66.96.192.92:80... connected.

HTTP request sent, awaiting response... 200 OK

Length: 129672769 (124M) [application/x-tar]

Saving to: `bigtest.tgz'

 4% [===>                                                                                       ] 5,730,344   1.12M/s  eta 1m 55s

100M带宽效果：

[[email protected]]# wget http://184.105.207.135/test.zip

--2010-08-09 12:32:29--  http://184.105.207.135/test.zip

Connecting to 184.105.207.135:80... connected.

HTTP request sent, awaiting response... 200 OK

Length: 104857600 (100M) [application/zip]

Saving to: `test.zip'

47% [==========================================>                                                ] 49,570,562  11.2M/s  eta 7s