中央处理器时间：在计算机的算术和逻辑单元里，处理一组指令所需要的实际计算时间。
CPU time: the actual computational time necessary to process a set of instructions in the arithmetic and logic units of the computer.
此值是实时测量的，而不是中央处理器的时间，所以一个在轻负载系统的阈值下的查询可能会高于重负载的系统的阈值。
This value is measured in real time, not CPU time, so a query that is under the threshold on a lightly loaded system might be above the threshold on a heavily loaded one.
所有入局包都要标上硬件时间戳，该硬件时间戳连同PT P包一起送到中央处理器(CPU)。
Hardware time stamping is done for all incoming packets and this time stamp is sent together with the PTP packet to the CPU.
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