针对路由器主动队列调度算法WFQ(Weighted Fair Queuing)在链路拥塞时无法保证低速率实时业务的QoS(Quality of Service)要求以及实时性业务突发时会导致延迟抖动加大的问题,提出了一种队长和权值调整的算法LW-WFQ。该算法增加了自适应...针对路由器主动队列调度算法WFQ(Weighted Fair Queuing)在链路拥塞时无法保证低速率实时业务的QoS(Quality of Service)要求以及实时性业务突发时会导致延迟抖动加大的问题,提出了一种队长和权值调整的算法LW-WFQ。该算法增加了自适应队列管理器和应对突发机制,减少了分组的排队等待时间。最后以NS2为平台,对WFQ及LW-WFQ算法的性能进行大量的仿真对比分析,调节并确定合适的参数,实验结果证明LW-WFQ算法在延迟、抖动等方面的性能有一定程度的提高。展开更多
The paper presents the simulation results of the comparison of three Queuing Mechanisms, First in First out (FIFO), Priority Queuing (PQ), and Weighted Fair Queuing (WFQ). Depending on their effects on the network’s ...The paper presents the simulation results of the comparison of three Queuing Mechanisms, First in First out (FIFO), Priority Queuing (PQ), and Weighted Fair Queuing (WFQ). Depending on their effects on the network’s Routers, the load of any algorithm of them over Router’s CPUs and memory usage, the delay occurred between routers when any algorithm has been used and the network application throughput. This comparison explains that, PQ doesn’t need high specification hardware (memory and CPU) but when used it is not fair, because it serves one application and ignore the other application and FIFO mechanism has smaller queuing delay, otherwise PQ has bigger delay.展开更多
文摘针对路由器主动队列调度算法WFQ(Weighted Fair Queuing)在链路拥塞时无法保证低速率实时业务的QoS(Quality of Service)要求以及实时性业务突发时会导致延迟抖动加大的问题,提出了一种队长和权值调整的算法LW-WFQ。该算法增加了自适应队列管理器和应对突发机制,减少了分组的排队等待时间。最后以NS2为平台,对WFQ及LW-WFQ算法的性能进行大量的仿真对比分析,调节并确定合适的参数,实验结果证明LW-WFQ算法在延迟、抖动等方面的性能有一定程度的提高。
文摘The paper presents the simulation results of the comparison of three Queuing Mechanisms, First in First out (FIFO), Priority Queuing (PQ), and Weighted Fair Queuing (WFQ). Depending on their effects on the network’s Routers, the load of any algorithm of them over Router’s CPUs and memory usage, the delay occurred between routers when any algorithm has been used and the network application throughput. This comparison explains that, PQ doesn’t need high specification hardware (memory and CPU) but when used it is not fair, because it serves one application and ignore the other application and FIFO mechanism has smaller queuing delay, otherwise PQ has bigger delay.
基金National Basic Research Program of China“973 Program”(2007CB307101,2007CB307106)Program of Introducing Talents of Discipline to Universities“111 Project”(B08002)+1 种基金Cultivation Fund of the Key Scientific and Technical Innovation Project,Ministry of Education of China(706005)National Natural Science Funds(60772043)
