F-PFC:基于INT的PFC优化方案
首发时间:2021-01-14
摘要:Remote Direct Memory Access (RDMA) 等高速传输技术正迅速改变着数据中心的面貌。为了在商用数据中心中部署RDMA,人们在现有以太网基础上部署了一套拥塞管理架构,包括PFC和拥塞控制机制。但拥塞控制的收敛速率太慢,无法有效消除排队时延,而PFC只会在缓存快要耗尽的时候才会起作用。针对交换机中的排队问题,本文提出了一种基于INT的PFC优化方案,该方案使用INT包头夹带控制信息,代替PFC的停等机制。F-PFC增加了流量控制的精度,一方面减少不必要的PFC触发,减少死锁的可能性;另一方面,减少将交换机的队列起伏,并将其限制在一个较低的水平,从而减少尾时延。本文使用NS3进行了情景模拟,结果显示基于INT的改进方案能够减少交换机的缓存波动,有效降低尾时延。
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F-PFC:Ensuring Low Queue Buildup With Fine-grained PFC
Abstract:Remote Direct Memory Access (RDMA) technology rapidly changes the landscape of nowadays datacenter. To deploy RDMA in production data centers, Priority-based Flow Control(PFC) and congestion control(CC) are deployed in Converged Ethernet. However, a lossless network does not guarantee low latency even with CC enabled. When network congestion happens, switch queues still build-up due to the response latency of end-to-end solutions. Motivated by the above problem, we propose F-PFC, a PFC optimization scheme based on (INT). F-PFC uses INT as a communication method among switches, reacts to the ephemeral congestion quickly and control flow rate in a fine-grained way. We perform simulations on NS3 and the results show that F-PFC can ensures low queue buildup, and reduce the tail latency.
Keywords: Computer Architecture Congestion Control In-band Network Telemetry Priority Flow Controld
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