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Performance Analysis of CoDel and PIE for Saturated TCP Sources

机译：饱和TCP源的CoDel和PIE性能分析

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摘要

In the recent years, the bufferbloat phenomenon was observed which is mainly due to oversized unmanaged buffers in the Internet. This triggered a new discussion of active queue management (AQM) algorithms in the IETF. "Controlled Delay" (CoDel) and "Proportional Integral controller Enhanced" (PIE) are considered as an alternative to "Random Early Detection" (RED). Their intention is both to take advantage of large buffers for occasional bursts and to limit queueing delays most of the time. Moreover, they are able to cope with varying bandwidth. In this paper, we study the performance of CoDel, PIE, and CoDel-ACT, which is an effective modification of CoDel that leads to better performance than CoDel in our studies. We experiment with saturated TCP sources and a fixed-bandwidth bottleneck link and focus on the delay-limiting phase of the algorithms. We investigate the impact of configuration parameters and traffic load on link utilization and queueing delay. We study the timely evolution of queuing delays and drop patterns, and point out significant differences among the algorithms. In particular, we show that CoDel's drop behavior changes over time and may lead to underutilization.
机译：近年来，观察到了缓冲膨胀现象，这主要是由于Internet中未管理的缓冲区过大所致。这引发了对IETF中主动队列管理（AQM）算法的新讨论。 “受控延迟”（CoDel）和“比例积分控制器增强”（PIE）被认为是“随机早期检测”（RED）的替代方法。他们的目的既是利用偶尔出现的突发的大缓冲区，又是在大多数情况下限制排队延迟。而且，它们能够应对变化的带宽。在本文中，我们研究了CoDel，PIE和CoDel-ACT的性能，这是对CoDel的有效修改，在我们的研究中，CoDel的性能优于CoDel。我们使用饱和的TCP源和固定带宽瓶颈链路进行实验，并将重点放在算法的延迟限制阶段。我们调查配置参数和流量负载对链路利用率和排队延迟的影响。我们研究了排队延迟和丢弃模式的及时演变，并指出了算法之间的显着差异。特别是，我们表明CoDel的掉落行为会随着时间而变化，并可能导致利用率不足。

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