QoSTCP: Provide Consistent Rate Guarantees to TCP flows in Software Defined Networks

Chien Chen, Hoa Chuan Fang, Muhammad Shahid Iqbal

研究成果: Conference contribution同行評審

摘要

The Quality of Service (QoS) for applications is becoming increasingly important with the expansion of the Internet. A software-defined network offers flexibility and scalability in the use of network resources, like a meter table, which enables OpenFlow switches to measure flow rates and can be used to realize the rate limiter QoS. However, this drops packets when the flow-rate is over the limit, making the TCP congestion window reduce and grow periodically. The QoS of the upper layer using TCP will suffer regularly because of packet losses and bandwidth oscillation. Therefore, we propose a QoSTCP protocol using the meter and Rate Limiting Notification (RLN) to improve the QoS of TCP in SDN. The meter in the switch measures the flow rate to mark RLNs in the packets when the flow rate exceeds the threshold. A QoSTCP sender gets marking information to reduce the window size proportional to the marking packet ratio to avoid packet drop. We also provide a theoretical analysis to estimate when to mark packets at specific thresholds under two kinds of bandwidth demands in QoS, maximum and average rate. In order to verify QoSTCP performance, we implement a Two Rate Three Color Marker (trTCM) meter to measure the flow rate and mark RLNs using a Programming protocol-independent Packet Processors (P4) switch. To simplify our implementation, the existing Explicit Congestion Notification (ECN) and Data Center TCP (DCTCP) are modified to emulate QoSTCP behavior. Experiment results confirm not only that QoSTCP provides a consistent rate guarantee by avoiding packet drop but also that it matches our theoretical analytical results.

原文English
主出版物標題2020 IEEE International Conference on Communications, ICC 2020 - Proceedings
發行者Institute of Electrical and Electronics Engineers Inc.
ISBN(電子)9781728150895
DOIs
出版狀態Published - 六月 2020
事件2020 IEEE International Conference on Communications, ICC 2020 - Dublin, Ireland
持續時間: 7 六月 202011 六月 2020

出版系列

名字IEEE International Conference on Communications
2020-June
ISSN(列印)1550-3607

Conference

Conference2020 IEEE International Conference on Communications, ICC 2020
國家Ireland
城市Dublin
期間7/06/2011/06/20

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