大规模互联网端到端行为评价指标研究

The Study on Evaluation Metric of Internet End-to-end Behavior

目前,Internet端到端行为的研究仅仅局限在包延迟、包丢失等测量指标的研究上,但如何根据测量指标对链路的性能进行评价却没有做深入研究。文章针对链路特性提出了两个评价指标:稳定系数和总体评价系数,对链路的稳定性和总体性能进行了评价。其中,稳定系数是评价网络链路稳定性的一个系数,总体评价系数是体现链路稳定性和链路速率的综合特性的一个系数,它反映了目前链路给用户的总体使用效果。接着文章介绍了在实际测量中用到的笔者自己编写的测量工具Posip。该工具采用指数间隔进行测量采样,并解决了一般ping工具中的“应答包丢失”问题。最后,文章使用工具posip对我国Internet教育网和科技网中的43条链路进行了测量和分析,并使用两种评价指标对所测链路进行了评价,取得了较好的效果。

At present ,the study on Internet end-to-end behavior has evolved in some degree.But the study on packet behavior only localized on measurement metrics such as packet delay and packet loss,and few people make in-depth study on how to evaluate the link performance based on measurement metrics.This paper puts forward two evaluation metrics on link characteristics:stability coefficient (SC)and General Evaluation Coefficient (GEC).SC is used to evaluate network link stability,and GEC indicates the general characteristic about link stability and link rates.GEC also reflects the general use effect when clients use links.Then it introduces a kind of tool″posip″which is used in the measure-ment.Posip is written by authors.This tool uses exponential interval to sampling,and solves the question in which″the e-cho reply packet is always lost″.In the end,this paper uses posip to measure and analyze the nearly40links in CST-NET and CERNET in China,and make use of the above two evaluation metrics to evaluate the measured links and ac-quire good effects.