局域网环境的网络时间协议性能测试

Network time protocol performance evaluation in LAN environment

网络时间协议(NTP)能够实现多节点时间和频率同步,具有简单、经济和高效等特点,但在性能测试方面的相关研究不多,使得在实际系统中是否采用NTP时缺乏参考数据。针对这一问题,开展了局域网环境下的NTP性能测试,分析了系统负载和网络负载对NTP性能的影响。在实际系统中,通过比较IRIG-B时码卡和GetLocalTimeWindows API返回的时间,近似获取了计算机基准时钟信号的频率偏差,该误差值与NTP测算的结果基本一致,表明本地一级NTP服务器时间同步和频率同步性能良好。

Network Time Protocol（NTP） is a simple,economic and efficient way to accomplish time and frequency synchronization of multiple nodes,while relevant study on the performance evaluation is hard to find in literature,which makes it a question whether to use NTP in application.Concerning this problem,the local network NTP performance and impact of system / network load were measured and analyzed on Windows platform.By comparing time value obtained from IRIG-B time code reader and GetLocalTime Windows API,frequency skew of computer clock signal was approximated.The skew value was close to the value calculated by NTP.