基于网络演算的确定性以太网性能评估

Performance evaluation on deterministic ethernet based on network calculus

采用网络演算理论研究复杂拓扑下确定性以太网的性能,提出级联拓扑和双通道级联拓扑,应用反卷积理论建立两种复杂拓扑下的网络演算模型,并建立相应仿真模型.最后将仿真结果和理论结果进行比较,并且根据不同大小的时间触发数据、速率受限数据和尽力而为数据分别在端到端时延、吞吐量以及丢包率三方面进行性能分析.分析结果表明:理论结果与仿真结果相符合,说明确定性以太网具有良好的确定性和实时性,且在双通道级联拓扑下具有很好的容错能力.

The theoretical tool of network calculus theory was adopted to conduct the performance research on complex topologies of deterministic Ethernet.Based on the simple star topology,cascade topology and dual-channel cascade topology was proposed.Firstly,the deconvolution theory was used to establish the network calculus model of the two complex topologies.Secondly,the simulation model of the two complex topologies was established.Lastly,the simulation results were compared with the theory results to analyze the determinacy and real-time of deterministic Ethernet.Besides,depending on the different size of time-triggered data,rate-limited data and best-effort data were analyzed performance in end to end delay,throughput and packet loss rate.Analysis results show that the simulation results fit well with the theory values,the complex topologies also have a good performance,and the fault-tolerance function plays well in dual-channel cascade topology.