A Fine-grained and Transparent Congestion Control Enforcement Scheme
A Fine-grained and Transparent Congestion Control Enforcement Scheme
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DOI：
10.1145/3232755.3232778
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发表时间：
2018-07
期刊：
影响因子：
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通讯作者：
Yuxiang Zhang;Lin Cui;Fung Po Tso;Quanlong Guan;Weijia Jia;Jipeng Zhou
中科院分区：
文献类型：
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作者：
Yuxiang Zhang;Lin Cui;Fung Po Tso;Quanlong Guan;Weijia Jia;Jipeng Zhou
在实践中，单个TCP拥塞控制通常用于处理Web服务器上的所有TCP连接，例如默认情况下Linux的Cubic。考虑到复杂多变的网络环境，默认的拥塞控制算法不一定是最合适的。根据不同的网络场景调整拥塞控制通常需要修改服务器的TCP栈。由于不同的操作系统和服务器上不同的配置，这是很困难的，如果不是不可能的话。在本文中，我们提出了一个轻量级且灵活的方案Mystique，它允许管理员（或运营商）透明地部署任何拥塞控制方案，而无需更改服务器上现有的TCP堆栈。我们已经在Open vSwitch （OVS）中实现了Mystique，并在公共云环境中进行了广泛的测试实验。我们对Mystique进行了广泛的评估，结果表明它能够有效地适应不同的网络条件，并且总是可以为每个TCP连接采用最合适的拥塞控制。与其他拥塞控制相比，Mystique可以显著减少延迟，最多可减少37.8%。
In practice, a single TCP congestion control is often used to handle all TCP connections on a Web server, e.g., Cubic for Linux by default. Considering complex and ever-changing networking environment, the default congestion control algorithm may not always be the most suitable one. Adjusting congestion control usually to meet different networking scenarios requires modification of servers' TCP stacks. This is difficult, if not impossible, due to various operating systems and different configurations on the servers. In this paper, we propose Mystique, a light-weight and flexible scheme that allows administrators (or operators) to deploy any congestion control schemes transparently without changing existing TCP stacks on servers. We have implemented Mystique in Open vSwitch (OVS) and conducted extensive testbed experiments in public cloud environments. We have extensively evaluated Mystique and the results have demonstrated that it is able to effectively adapt to varying network conditions, and can always employ the most suitable congestion control for each TCP connection. Mystique can significantly reduce latency by up to 37.8% in comparison with other congestion controls.