RTCP - Reduce Delay Variability with an End-to-end Approach
2020 IFIP Networking Conference (Networking)(2020)
摘要
Many important applications in modern network systems are sensitive to delay and delay variability. To ensure good performance on both metrics, in this paper, we propose a novel transport protocol called Regulated TCP (RTCP), whose design is inspired by the use of auxiliary variables in optimization theory. RTCP is a light-weight protocol and it uses counters in end devices and end-to-end delay measurements for rate adaptation (via window adjustment). We implement RTCP in both ns-3 and a network testbed under two workload types, i.e., web search and data mining. Our testbed experiments show that compared to existing congestion control schemes such as BBR [1] and PCC [2], RTCP guarantees a better delay performance for urgent flows, while keeping a competitive goodput. Our ns-3 simulation results also demonstrate that RTCP performs well in a wide range of scenarios. In particular, RTCP achieves a 9.78% throughput increase over BBR, and a 64.22% delay reduction of DCTCP [3] in a random sending scenario. It also reduces the 99th packet delay to less than 56% of other end-to-end TCP versions, including LEDBAT [4], TIMELY [5] and Vegas [6], in the large-scale incast scenario.
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关键词
Transmission Control Protocol,Delay Variability,End-to-end
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