Round-Robin分配方式下多径传输的重排序性能分析

Analysis on Packet Reordering under Multi-path Transfers with Round-Robin Packet Assignment

基于包分配的多径传输在接收端所引起的数据包乱序严重影响TCP的传输性能。针对此问题,从排队论的角度出发对Round-Robin分配方式下多径传输的重排序问题进行了分析。从数据包的乱序率、重排序时间和端到端总时间3个方面考察了路径差异与路径数目对多径传输的性能的影响。结果表明,在采用两条路径传输时,应使得两条路径的传输速率近似相同;在路径传输速率相同的条件下,为明显地提升多径传输的重排序性能,路径数目应不超过4条。

Packet-level multi-path transfers can cause packets reordering at the destination,this profoundly affects TCP performance.Addressing with this problem,reordering performance under multi-path transfers with Round-Robin packet assignment is analyzed in the view of queuing theory.The influence of path difference and path numbers on reordering performance under multi-path transfers is discussed with respect to three criterions： disorder rate,resequencing time and end-to-end total time.Results demonstrate that it is preferable to make paths with closer transmission rate for two paths transfers,and the paths number dose not exceed four to significantly improve the reorder performance if the paths have the same transmission rate.