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Summary area fields

 

Cpu(s): 38.0%us, 12.6%sy,  0.0%ni, 43.1%id,  3.5%wa,  0.0%hi,  2.8%si,  0.0%st

describing CPU statistics are  abbreviated

The 3 CPU states

Idle
Running in user mode
Running in kernel mode

解釋:

us = user mode
sy = system mode
ni = the CPU spent running user space processes that have been niced (nice)
id = idle task (如果 cpu 無野做, 那會 99%)
wa = I/O waiting (reading or writing to a disk)
hi = servicing IRQs
si = servicing soft IRQs
st = steal (time given to other DomU instances)
     ( How long the virtual CPU has spent waiting for the hypervisor to service another virtual CPU )