Expanding across time to deliver bandwidth efficiency and low latency
Expanding across time to deliver bandwidth efficiency and low latency
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发表时间：
2019-03
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通讯作者：
W. M. Mellette;Rajdeep Das;Yibo Guo;Rob McGuinness;A. Snoeren;G. Porter
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作者：
W. M. Mellette;Rajdeep Das;Yibo Guo;Rob McGuinness;A. Snoeren;G. Porter
数据中心需要同时支持低延迟和高带宽数据包传输的网络，以满足现代应用的严格要求。我们提出的Opera，一个动态的网络，提供延迟敏感的流量迅速依赖于多跳转发以同样的方式作为扩展器基于图的方法，但提供接近最佳的带宽，通过直接转发的批量流量随时间变化的源到目的地电路。Opera设计的关键是快速和确定性地逐段重新配置网络，这样网络在任何时刻都可以实现扩展图，但是，跨时间集成，网络在所有机架之间提供带宽高效的单跳路径。我们发现，Opera支持低延迟流量，流完成时间与成本相当的静态拓扑相当，同时为所有对所有流量提供高达4倍的带宽，并为发布的数据中心工作负载提供60%的负载。
Datacenters need networks that support both low-latency and high-bandwidth packet delivery to meet the stringent requirements of modern applications. We present Opera, a dynamic network that delivers latency-sensitive traffic quickly by relying on multi-hop forwarding in the same way as expander-graph-based approaches, but provides near-optimal bandwidth for bulk flows through direct forwarding over time-varying source-to-destination circuits. The key to Opera's design is the rapid and deterministic reconfiguration of the network, piece-by-piece, such that at any moment in time the network implements an expander graph, yet, integrated across time, the network provides bandwidth-efficient single-hop paths between all racks. We show that Opera supports low-latency traffic with flow completion times comparable to cost-equivalent static topologies, while delivering up to 4x the bandwidth for all-to-all traffic and supporting 60% higher load for published datacenter workloads.