Damn 安装CENTOS6.0后，默认网络是不可用的，需要手动配置一下
vi /etc/sysconfig/network-scripts/ifcfg-eth0
默认显示
DEVICE=eth0
HWADDR=00:16:3E:7E:52:E0 //网卡物理地址
ONBOOT=no
修改为
DEVICE=eth0
BOOTPROTO=dhcp //获取IP方式：dhcp是自动获取，static是固定IP，none是手动
HWADDR=00:16:3E:7E:52:E0
ONBOOT=yes //启动时网络接口默认有效
然后reboot就可以了
顺便做个测试
[root@bear ~]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 28.431 s, 37.8 MB/s
[root@bear ~]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 29.8728 s, 35.9 MB/s
[root@bear ~]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 25.9157 s, 41.4 MB/s[root@bear ~]# wget -O /dev/null http://mirror.leaseweb.com/speedtest/100mb.bin
–2011-11-12 02:39:49– http://mirror.leaseweb.com/speedtest/100mb.bin
Resolving mirror.leaseweb.com… 94.75.223.121, 2001:1af8:4030:1:0:dead:beef:cafe
Connecting to mirror.leaseweb.com|94.75.223.121|:80… connected.
HTTP request sent, awaiting response… 200 OK
Length: 100000000 (95M) [application/octet-stream]
Saving to: 鈥?dev/null鈥?100%[======================================>] 100,000,000 2.85M/s in 52s
2011-11-12 02:40:41 (1.84 MB/s) – 鈥?dev/null鈥?saved [100000000/100000000]