系统域网中用户级通信库的实现

在系统域网环境中，网络硬件具备非常优良的性能，然而传统的通信库存在大量不必的要软件开销，大幅度地降低了通信性能。通过允许用户进程直接访问网络设备并减少收发过程中的内存拷贝，可以避免由操作系统带来的开销，从而实现用户级通信，降低延迟并提高带宽。经过对用户级通信库的性能分析，可以发现用户级通信库具有更好的性能。

Realization of User-level Communication Library in System Area Network

In system area network environment, networking hardware provides high-performance, while traditional communication libraries have massive unnecessary software overheads, which severely lower the communication performance. By allowing user process access network interface directly and decreasing memory copy times, the overhead from operation system can be avoided, which finally leads to user-level communication and decreases latency and increases the bandwidth. Through analyzing the performance of communication library, it can be concluded that the user-level communication library provides better performance.