底层通信协议中内存映射机制的设计与实现*

在底层网络通信协议中使用内存映射机制为用户层应用提供了虚拟网络界面,使用户层能够方便地访问快速通信设备;通过减少系统软件的协议处理开销,有效地减少了网络通信的延迟.讨论了通信协议中的内存映射机制的设计思想和实现过程,提出了通信区的概念,利用通信区有效地完成核心与用户之间的数据交换.同时给出一个实例,对其实现与性能进行了分析.

Design and Implementation of Memory Map Mechanism in Underlying Communication

In underlying communication, using memory map provides user-level applications with a virtual network interface to enable user level access high speed communication devices, efficiently reduces the overhead of system protocol software and the latency in communication. In this paper, the design idea, the implementation process and the concept of communication area are discussed, by which the data can be exchanged between the kernel and user space efficiently. A sample and performance analyses are provided at last.