What are RDMA queue pairs?

What are RDMA queue pairs?

RDMA communication is based on a set of three queues. The send queue and receive queue are responsible for scheduling work. They are always created in pairs. They are referred to as a Queue Pair(QP). A Completion Queue (CQ) is used to notify us when the instructions placed on the work queues have been completed.

Where is RDMA used?

It is particularly useful when analyzing big data, in supercomputing environments that process applications, and for machine learning that requires low latencies and high transfer rates. RDMA is also used between nodes in compute clusters and with latency-sensitive database workloads.

What is Ofed Mellanox?

Mellanox OFED (MLNX_OFED) is a Mellanox tested and packaged version of OFED and supports two interconnect types using the same RDMA (remote DMA) and kernel bypass APIs called OFED verbs – InfiniBand and Ethernet.

What is RDMA send?

RDMA Send and Receive Traditional message passing where both the source and the destination processes are actively involved in the communication. Both need to have created their queues: ▪ A queue pair of a send and a receive queue.

What is InfiniBand driver?

InfiniBand is a network architecture that is designed for the large-scale interconnection of computing and I/O nodes through a high-speed switched fabric. To operate InfiniBand on a Sun Blade 8000 Series Modular System, you need an InfiniBand HCA (the ExpressModule) and an InfiniBand software stack.

What is Linux RDMA?

Remote Direct Memory Access (RDMA) is a computer networking technology usually implemented over high-speed, low-latency networks (aka fabrics) which allows for direct access to a remote host’s memory, dramatically reducing latency and CPU overhead.

What is InfiniBand RDMA?

RDMA over Converged Ethernet (RoCE) or InfiniBand over Ethernet (IBoE) is a network protocol that allows remote direct memory access (RDMA) over an Ethernet network. It does this by encapsulating an InfiniBand (IB) transport packet over Ethernet. There are two RoCE versions, RoCE v1 and RoCE v2.

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