Linux CPU States and there meaning

Understanding what the Linux “top” command reports on. From shell, simply use:
top
for a plethora of system usage statistics, extremely useful for keeping an eye on resources.

us: userspace - what you’re running above the kernel
sy: system calls - what is running inside the kernel

ni: reniced processes
id: idle
wa: waiting for i/o
hi: hardware interrupts - how much time is spent dealing with hardware
si: software interrupts - how much time is spent dealing with software-created interrupts (system calls, etc.)