基于实测流量的网际分组丢失率分析

Analysis of packet loss rate based on the measured traffic

分组丢失率是评价网络性能的一个重要指标。提出了一种利用完整TCP流计算实测数据中分组丢失率的方法,并基于实测数据对CERNET江苏省网与外部不同网络分区的分组丢失率进行分析。算法给出了基于实测数据的分组丢失率包括首次分组丢失率pfl、整体分组丢失率psl和重传率prp 3个测度。统计分析表明,在绝大多数情况下,pfl比psl小,而prp比pfl和psl明显要高,验证了分组丢失对网络性能的影响以及重传率明显比分组丢失率高。

The packet loss rate is one of key indicators to evaluate the performance of network. A method for calculating packet loss rate in the measured data based on the intact TCP flows was presented. Based on the measured data, the packet loss rate of Jiangsu Province in CERNET network and different partitions outside was analysed. The algorithm gives the packet loss rate including first packet loss rate pfl, overall packet loss rate psl and retransmission rate prp. Through statistical analysis, pfl is smaller than psl in the vast majority of cases, and prp is significantly higher than pfl and psl, which proves the impact of packet loss on the performance of network, and retransmission rate is obviously higher than packet loss rate.