NDLI: RoCE Rocks without PFC: Detailed Evaluation

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RoCE Rocks without PFC: Detailed Evaluation

Content Provider	ACM Digital Library
Author	Barnea, Aviv Kuta, Eitan Yekelis, Gennady Zus, Michael Damsker, Rotem Dahley, Omar Zahavi, Eitan Shpiner, Alexander Baram, Dean
Abstract	In recent years, the usage of RDMA in data center networks has increased significantly, with RDMA over Converged Ethernet (RoCE) emerging as the canonical approach for deploying RDMA in Ethernet-based data centers. Initial implementations of RoCE required a lossless fabric for optimal performance. This is typically achieved by enabling Priority Flow Control (PFC) on Ethernet NICs and switches. The RoCEv2 specification introduced RoCE congestion control, which allows throttling the transmission rate in response to congestion. Consequently, packet loss is minimized and performance is maintained, even if the underlying Ethernet network is lossy. In this paper, we discuss the latest developments in RoCE congestion control. Hardware congestion control reduces the latency of the congestion control loop; it reacts promptly in the face of congestion by throttling the transmission rate quickly and accurately. The short control loop also prevents network buffers from overfilling under various congestion scenarios. In addition, fast hardware retransmission complements congestion control in severe congestion scenarios, by significantly reducing the performance penalty of packet drops. We survey architectural features that allow deployment of RoCE over lossy networks and present real lab test results.
Starting Page	25
Ending Page	30
Page Count	6
File Format	PDF
ISBN	9781450350532
DOI	10.1145/3098583.3098588
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2017-08-09
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Roce Congestion control Performance
Content Type	Text
Resource Type	Article

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