us,sy,ni,id,wa,hi,si,st

SUMMARY Area Fields
       The summary area fields  describing  CPU  statistics  are  abbreviated.
       They provide information about times spent in:
           us = user mode
           sy = system mode
           ni = low priority user mode (nice)
           id = idle task
           wa = I/O waiting
           hi = servicing IRQs
           si = servicing soft IRQs
           st = steal (time given to other DomU instances)



us: is meaning of "user CPU time"
sy: is meaning of "system CPU time"
ni: is meaning of" nice CPU time"
id: is meaning of "idle"
wa: is meaning of "iowait"
hi：is meaning of "hardware irq"
si : is meaning of "software irq"
st : is meaning of "steal time"

中文翻译为：

us 用户空间占用CPU百分比
sy 内核空间占用CPU百分比
ni 用户进程空间内改变过优先级的进程占用CPU百分比
id 空闲CPU百分比
wa 等待输入输出的CPU时间百分比
hi 硬件中断
si 软件中断
st: 实时