perfstart [pipe buffer len] [performance save node] [refresh period]

[root@sylixos:/root]# help perfstart
start performance statistics.
pipe buffer len      : 128 ~ 4096
performance save node: 10 ~ 30
refresh period       : >= 1 second(s).
perfstart [pipe buffer len] [performance save node] [refresh period]
[root@sylixos:/root]# 

[root@sylixos:/lib/modules]# perfstart 1024 20
performance statistics start checking...