SketchINT: Empowering INT with TowerSketch for Per-flow Per-switch Measurement

Kaicheng Yang, Yuanpeng Li, Zirui Liu, Tong Yang, Yu Zhou, Jintao He, Jing'an Xue, Tong Zhao, Zhengyi Jia, Yongqiang Yang
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引用次数: 20

Abstract

1 Network measurement is indispensable to network operations. Two most promising measurement solutions are In-band Network Telemetry (INT) solutions and sketching solutions. INT solutions provide fine-grained per-switch per-packet information at the cost of high network overhead. Sketching solutions have low network overhead but fail to achieve both simplicity and accuracy for per-flow measurement. To keep their advantages, and at the same time, overcome their shortcomings, we first design SketchINT to combine INT and sketches, aiming to obtain all per-flow per-switch information with low network overhead. Second, for deployment flexibility and measurement accuracy, we design a new sketch for SketchINT, namely TowerSketch, which achieves both simplicity and accuracy. The key idea of TowerSketch is to use different-sized counters for different arrays under the property that the number of bits used for different arrays stays the same. TowerSketch can automatically record larger flows in larger counters and smaller flows in smaller counters. We have fully implemented our SketchINT prototype on a testbed consisting of 10 switches. We also implement our TowerSketch on P4, single-core CPU, multi-core CPU, and FPGA platforms to verify its deployment flexibility. Extensive experimental results verify that 1) TowerSketch achieves better accuracy than prior art on various tasks, outperforming the state-of-the-art ElasticSketch up to 13.9 times in terms of error; 2) Compared to INT, SketchINT reduces the number of packets in the collection process by 3 4 orders of magnitude with an error smaller than 5%.
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SketchINT:用TowerSketch授权INT进行逐流逐开关测量
1 .网络测量是网络运营不可或缺的一部分。两个最有前途的测量解决方案是带内网络遥测(INT)解决方案和草图解决方案。INT解决方案以高网络开销为代价提供细粒度的每个交换机每个数据包信息。速写解决方案具有较低的网络开销,但无法实现每流测量的简单性和准确性。为了保持它们的优点,同时克服它们的缺点,我们首先设计了SketchINT,将INT和草图结合起来,旨在以低网络开销获取所有的每流每交换机信息。其次,为了部署灵活性和测量精度,我们为SketchINT设计了一个新的草图,即TowerSketch,它既简单又准确。TowerSketch的关键思想是为不同的数组使用不同大小的计数器,其属性是用于不同数组的位数保持不变。TowerSketch可以在较大的计数器中自动记录较大的流量,在较小的计数器中自动记录较小的流量。我们已经在一个由10个开关组成的测试台上完全实现了我们的SketchINT原型。我们还在P4、单核CPU、多核CPU和FPGA平台上实现了TowerSketch,以验证其部署灵活性。大量的实验结果验证了1)TowerSketch在各种任务上比现有技术实现了更好的准确性,在误差方面优于最先进的ElasticSketch高达13.9倍;2)与INT相比,SketchINT将收集过程中的数据包数量减少了34个数量级,误差小于5%。
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