The classic use case for queuing is to buffer messages when they are produced faster than they are consumed.
当生成消息的速度大于使用消息的速度时，队列技术的经典用例是缓存消息。
This character results in increase of packet lost rate and queuing delay of buffer system.
这种特性会导致分组丢失率增大和缓存系统排队延时的增加。
To determine the thresholds of the occupied buffer level, two queuing models with different arrivals are established.
通过分析两种到达情况的排队模型，给出了缓冲区门限的选取原则。
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