Recent advances in fast optical switching technology show promise in meeting the high goodput and low latency requirements of datacenter networks (DCN). We present NegotiaToR, a simple network architecture for optical reconfigurable DCNs that utilizes on-demand scheduling to handle dynamic traffic. In NegotiaToR, racks exchange scheduling messages through an in-band control plane and distributedly calculate non-conflicting paths from binary traffic demand information. Optimized for incasts, it also provides opportunities to bypass scheduling delays. NegotiaToR is compatible with prevalent flat topologies, and is tailored towards a minimalist design for on-demand reconfigurable DCNs, enhancing practicality. Through large-scale simulations, we show that NegotiaToR achieves both small mice flow completion time (FCT) and high goodput on two representative flat topologies, especially under heavy loads. Particularly, the FCT of mice flows is one to two orders of magnitude better than the state-of-the-art traffic-oblivious reconfigurable DCN design.

翻译：快速光交换技术的最新进展有望满足数据中心网络对高有效吞吐量和低延迟的要求。本文提出NegotiaToR，一种用于光可重构数据中心网络的简单架构，它利用按需调度来处理动态流量。在NegotiaToR中，机架通过带内控制平面交换调度消息，并根据二进制流量需求信息分布式地计算无冲突路径。该架构针对多对一通信模式进行了优化，并提供了绕过调度延迟的机会。NegotiaToR与主流的扁平拓扑兼容，并专为按需可重构数据中心网络的极简主义设计而定制，从而增强了实用性。通过大规模仿真，我们证明NegotiaToR在两种代表性的扁平拓扑上，尤其是在高负载下，既能实现较小的短流完成时间，又能获得较高的有效吞吐量。具体而言，其短流完成时间比当前最先进的流量无感知可重构数据中心网络设计优一到两个数量级。