自适应网络往返时延采样方法

在讨论周期性数据采样算法弊端的基础上，提出自适应往返时延（RTT）的采样算法。该算法以时延变化率作为动态控制采样频率的主要依据，根据网络时延变化的缓急自动调整采样时间间隔。通过实验分析证明，该算法实现简单，可有效地跟踪网络RTT变化情况，从总体上减少采样工作量，减轻因网络测量而给网络带来的额外负载。

Adaptive sampling algorithm of network round-trip time

Round-Trip Time (RTT) is an important performance metric of IP network which reflects network paths workload characteristics. To overcome the ignorance of network performance variation characteristics of the equal-interval sampling algorithm, the paper presented an adaptive algorithm based on estimation method, which determined sampling time by the degree of delay variation. The verification shows that the method not only effectively tracks delay change but also reduces sampling time very well.