What is Ibverbs?

libibverbs is a library that allows userspace processes to use RDMA “verbs” to perform high-throughput, low-latency network operations for both Infiniband (according to the Infiniband specifications) and iWarp (iWARP verbs specifications).

What is RDMA used for?

Overview. Remote Direct Memory Access (RDMA) is an extension of the Direct Memory Access (DMA) technology, which is the ability to access host memory directly without CPU intervention. RDMA allows for accessing memory data from one host to another.

What is SGE in RDMA?

To define what address in memory to write to or read from, Scatter/Gather Elements (SGE) are used – and associated with a WR. An SGE is a pointer to a Memory Region (MR) which the HCA can read from or write to.

What is verbs RDMA?

Verb types: One-sided verbs (RDMA operations) operate directly on a remote node’s memory, bypassing its CPU, and include RDMA reads, writes, and atomic operations. Two-sided verbs include the send and receive verbs; their functionality resembles send() and recv() functions in traditional sockets programming.

Why is InfiniBand faster than Ethernet?

InfiniBand also has much lower latency than Ethernet and, most importantly, it incorporates processing engines inside the network that accelerate data processing for deep learning and high-performance computing. These are key technology advantages for any compute- and data-intensive application.

What is an IB switch?

InfiniBand (IB) is a computer-networking communication standard used in high-performance computing that features very high throughput and very low latency. It is used for data interconnect both among and within data switches.

Is RDMA a TCP?

iWARP: TCP-based RDMA network, which uses TCP to achieve reliable transmission. Compared with RoCE, on a large-scale network, a large number of TCP connections of iWARP occupy a large number of memory resources.

What is HCA RDMA?

In order to use RDMA, a Network Interface Card(NIC) is required. This NIC implements RDMA engine. This is called Host Channel Adapter(HCA). The HCA creates a channel from RDMA engine to application memory as shown in ​Fig 1​.

Does RDMA use TCP?

performance of a network copy and the impact on the CPU resources on the source system. To show the benefits of RDMA, the test uses SMB Direct enabled (RoCE) and disabled (TCP/IP).

What are InfiniBand verbs?

“Verbs” is the term used for both the seman- tic description of the interface in the InfiniBand Architecture Specifications, and the name used for the functions defined in the widely used OpenFabrics Alliance (OFA) implementation of the software interface to InfiniBand.

What is InfiniBand used for?

InfiniBand is a channel-based fabric that facilitates high-speed communications between interconnected nodes. An InfiniBand network is typically made up of processor nodes, such as PCs, servers, storage appliances and peripheral devices. It also has network switches, routers, cables and connectors.