论文部分内容阅读
以发送包链为特征的可用带宽测量会产生较大探测流量而影响网络性能.设计了三种具有不同包链长度的测量模式模拟典型的包链发送策略,仿真分析了可用带宽测量的TCP友好性.发现可用带宽测量的TCP友好性并不理想,原因在于探测流会增大TCP流的时延及丢包而触发TCP的拥塞控制机制.仿真中最大降低TCP数据传输量近16%;且太长或过短的包链发送策略对TCP性能有更大影响.在Pathoad这一典型可用带宽测量工具中的分析结果进一步验证了该结论,且得出了Pathload的应用策略.
The measurement of available bandwidth, which is characterized by sending packet chain, will generate larger probe traffic and affect the network performance.Three different measurement modes with different packet chain lengths are designed.The typical packet chain transmission strategy is simulated, and the TCP-friendly The TCP friendliness of the available bandwidth measurements is not ideal because the probe stream increases the delay and packet loss of the TCP stream and triggers the TCP congestion control mechanism to reduce TCP throughput by as much as 16% Too long or too short packet chain sending strategy has a greater impact on the performance of TCP.This conclusion is further verified by the analysis results in Pathoad, a typical available bandwidth measurement tool, and the application strategy of Pathload is obtained.