sar 命令使用详解
1.使用sar命令查看网络流量(每两秒显示一次，共查看3次)：
[root@localhost ~]# sar -n DEV 2 3
Linux 2.6.32-431.el6.x86_64 (localhost) 11/08/2015 _x86_64_ (4 CPU)
02:53:48 PM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s
02:53:50 PM lo 28.28 28.28 38.07 38.07 0.00 0.00 0.00
02:53:50 PM eth0 158.59 187.37 26.74 21.38 0.00 0.00 0.00
02:53:50 PM virbr0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
02:53:50 PM virbr0-nic 0.00 0.00 0.00 0.00 0.00 0.00 0.00
02:53:50 PM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s
02:53:52 PM lo 7.07 7.07 0.45 0.45 0.00 0.00 0.00
02:53:52 PM eth0 123.23 123.23 15.19 14.27 0.00 0.00 0.00
02:53:52 PM virbr0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
02:53:52 PM virbr0-nic 0.00 0.00 0.00 0.00 0.00 0.00 0.00
02:53:52 PM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s
02:53:54 PM lo 12.12 12.12 0.73 0.73 0.00 0.00 0.00
02:53:54 PM eth0 108.08 116.67 9.65 11.37 0.00 0.00 0.00
02:53:54 PM virbr0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
02:53:54 PM virbr0-nic 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average: IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s
Average: lo 15.82 15.82 13.08 13.08 0.00 0.00 0.00
Average: eth0 129.97 142.42 17.19 15.67 0.00 0.00 0.00
Average: virbr0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Average: virbr0-nic 0.00 0.00 0.00 0.00 0.00 0.00 0.00