Linux内核中，含有关于网络数据包有流量控制的功能模块，用于完成QoS的需求。本文介绍这个模块的实现，并说明如何在其基础上编程。-Linux kernel network packet contains information about the function of a flow control module for complete QoS requirements. This article describes the implementation of this module, and how the basis of its programming.