提出一个面向单条链路的 TCP 综合传输性能测度 R,分析其与同一时间粒度内链路的占用带宽和 UDP流量比例间的关系,使用中国和美国2条主干信道的实测数据进行了检验。结果表明 R 测度可表示为以占用带宽和 UDP 流量比例为参数的正态分布的随机过程。随后进行的 CERNET 链路 R 测度正态分布均值参数的拟合分析具有很高的可接受水平,拟合的结果给出的量化关系可用于流量的公平性评价。%A single link-oriented TCP transmission performance metric called "R" was proposed. The relationship be-tween metric R and two indicators (the utilized link bandwidth and the UDP traffic proportion) on the same link was ana-lyzed, and the experiment results on passive measurement datasets from two bidirectional network links separately locat-ed in USA and China were laid out. The results show that the metric R can be expressed as a normally distributed sto-chastic process with distinct parameters decided by the utilized bandwidth and the UDP traffic proportion. Further, by using fitting methods on local datasets, a concrete function, which was acceptable at a high confidence level, was given to describe the relationship between the mean value of R's normal distribution and the two indicators mentioned before. This work offers a reference to the study of network fairness.
展开▼
