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arXiv 2201.03734cs.NI
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数据中心间网络的拥塞控制机制

Congestion Control Mechanisms for Inter-Datacenter Networks

Gaoxiong Zeng

摘要:

在地理上分布的环境中运行的应用程序变得越来越普遍。大型在线服务通常将其数据共享或复制到不同地理区域的多个数据中心(DC)。在这些应用的数据通信需求的驱动下,数据中心间网络(IDN)变得越来越重要。然而,我们发现数据中心间网络的拥塞控制相当具有挑战性。首先,数据中心间通信涉及数据中心网络(DCN)和连接多个数据中心的广域网(WAN)。这样的网络环境呈现出相当异构的特性(例如,缓冲深度,RTT)。现有的拥塞控制机制考虑DCN或WAN拥塞,而不同时捕获两者的拥塞程度。其次,为了降低演进成本和提高灵活性,大型企业已经构建和部署了基于浅缓冲交换芯片的广域路由器。然而,对于传统的拥塞控制机制(例如,TCP Cubic),浅缓冲区很容易被大的BDP(带宽延迟产品)广域流量淹没,导致高数据包丢失和吞吐量下降。本论文描述了我在优化数据中心间网络的拥塞控制机制方面的研究工作。首先,我们设计了GEMINI --一种实用的拥塞控制机制,它可以同时处理DCN和WAN中的拥塞。其次,我们提出了FlashPass -一种主动的拥塞控制机制,实现了近零的损失,而不会降低吞吐量下的浅缓冲广域网。广泛的评估表明,他们优于现有的拥塞控制机制的性能。

英文摘要:

Applications running in geographically distributed setting are becoming prevalent. Large-scale online services often share or replicate their data into multiple data centers (DCs) in different geographic regions. Driven by the data communication need of these applications, inter-datacenter network (IDN) is getting increasingly important. However, we find congestion control for inter-datacenter networks quite challenging. Firstly, the inter-datacenter communication involves both data center networks (DCNs) and wide-area networks (WANs) connecting multiple data centers. Such a network environment presents quite heterogeneous characteristics (e.g., buffer depths, RTTs). Existing congestion control mechanisms consider either DCN or WAN congestion, while not simultaneously capturing the degree of congestion for both. Secondly, to reduce evolution cost and improve flexibility, large enterprises have been building and deploying their wide-area routers based on shallow-buffered switching chips. However, with legacy congestion control mechanisms (e.g., TCP Cubic), shallow buffer can easily get overwhelmed by large BDP (bandwidth-delay product) wide-area traffic, leading to high packet losses and degraded throughput. This thesis describes my research efforts on optimizing congestion control mechanisms for the inter-datacenter networks. First, we design GEMINI - a practical congestion control mechanism that simultaneously handles congestions both in DCN andWAN. Second, we present FlashPass - a proactive congestion control mechanism that achieves near zero loss without degrading throughput under the shallow-buffered WAN. Extensive evaluation shows their superior performance over existing congestion control mechanisms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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