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首页> 外文会议>Performance Computing and Communications Conference, IPCCC, 2008 IEEE International >Towards a Queue Sensitilve Transport Protocol
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Towards a Queue Sensitilve Transport Protocol

机译：迈向队列敏感传输协议

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The TCP NewReno congestion control protocol relies only on packer losses for detecting congestion??this causes long NewReno transfers to build up large packet queues in router buffers. High buffer occupancy hinders performance of real-time applications as well as the development of high-speed routers. Several alternate congestion-control strategies have been proposed in the literature to help maintain low buffer occupancy. In this paper, we experimentally evaluate prominent proposals by emulating empirically-derived traffic mixes on a Linux-based lab testbed. We show that when existing proposals are used with such representative traffic mixes, they are unable to simultaneously ensure small router queues and high TCP throughput. Further analysis shows that the common practice of using TCP round-trip times for estimating queuing delays (as in TCP Vegas) fails in a highly-aggregated environment that contains short as well as long transfers??such environments would need to rely on explicit router feedback. We also find that proposals that rely on router feedback in the form of link utilization (as recently proposed in VCP) are not effective in maintaining high transfer throughput. Instead, we argue that a congestion control algorithm which used queuing delay feedback from routers can reduce the buffer occupancy of routers without sacrificing response time performance of connections. We use this idea to design two new protocals??EDN and PEDN??and show that these two protocols can help manage the trade-off between maintaining low buffer occupancy and providing high TCP throughput.
机译：TCP NewReno TCP拥塞控制协议仅依靠打包程序丢失来检测拥塞，这会导致长时间的NewReno传输在路由器缓冲区中建立大型数据包队列。高缓冲区占用率会阻碍实时应用程序的性能以及高速路由器的开发。文献中已经提出了几种替代的拥塞控制策略，以帮助维持较低的缓冲区占用率。在本文中，我们通过在基于Linux的实验室测试平台上模拟基于经验的流量混合，以实验方式评估重要的建议。我们表明，将现有建议与此类代表性流量混合一起使用时，它们无法同时确保较小的路由器队列和较高的TCP吞吐量。进一步的分析表明，使用TCP往返时间来估计排队延迟的常规做法（如TCP Vegas）在包含短传输和长传输的高度聚合的环境中失败了–这种环境将需要依赖显式路由器回馈。我们还发现依赖链路利用率形式的路由器反馈的建议（如VCP中最近提出的建议）在维持高传输吞吐量方面无效。相反，我们认为，使用来自路由器的排队延迟反馈的拥塞控制算法可以在不牺牲连接响应时间性能的情况下减少路由器的缓冲区占用。我们使用这种想法设计了两个新的协议EDN和PEDN，并表明这两个协议可以帮助管理在保持低缓冲区占用率和提供高TCP吞吐量之间进行权衡的问题。

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