Ubiquitous RoCE: RoCE on Datacenter Networks

Описание: In this video from the OpenFabrics Workshop, Alex Shpiner from Mellanox presents: Ubiquitous RoCE: RoCE on Datacenter Networks.

"In recent years, the usage of RDMA in datacenter networks has increased significantly, with RoCE (RDMA over Converged Ethernet) emerging as the canonical approach to deploying RDMA in Ethernet-based datacenters.

Initially, 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 transmission rate in response to congestion. Consequently, packet loss may be minimized and performance is maintained even if the underlying Ethernet network is lossy.

In this talk, we discuss the details of latest developments in the 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; when congestion is relieved, bandwidth is immediately recovered. The short control loop also prevents network buffers from overfilling
in many congestion scenarios.

In addition, fast hardware retransmission complements congestion control in heavy congestion scenarios, by significantly reducing the penalty of packet drops."

Learn more: https://www.openfabrics.org/index.php...

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