HP 226824-001 - ProLiant - ML750 Manuel d'introduction - Page 4

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RDMA over TCP

Ethernet is the most prevalent network interconnect in use today. IT organizations have invested

heavily in Ethernet technology and most are unwilling to tear out their networks and replace them.

Reliance on Ethernet is justified by its low cost, backward compatibility, and consistent bandwidth

upgrades over time. Today's Ethernet networks, which use TCP/IP operations, commonly operate at

100 megabits per second (Mb/s) and 1 gigabit per second (Gb/s). Next-generation speeds will

increase to 10 Gb/s. Customer migration to 10-Gb Ethernet will be tempered by the input/output

(I/O) processing burden that TCP/IP operations place on servers.

The addition of RDMA capability to Ethernet will reduce host processor utilization and increase the

benefits realized by migrating to 10-Gb Ethernet. Adding RDMA capability to Ethernet will allow data

centers to expand the infrastructure with less effect on overall performance. This improves

infrastructure flexibility for adapting to future needs.

RDMA over TCP is a communication protocol that moves data directly between the memory of

applications on two systems (or nodes), with minimal work by the operating system kernel and without

interim data copying into system buffers (Figure 2). This capability enables RDMA over TCP to work

over standard TCP/IP-based networks (such as Ethernet) that are commonly used in data centers

today. Note that RDMA over TCP does not specify the physical layer and will work over any network

that uses TCP/IP.

Figure 2. Data flow with RDMA over TCP (Ethernet)

Sending Host

Memory

Chipset

Ethernet

NIC

TX Pr

RX Pr

RDMA over TCP allows many classes of traffic (networking, I/O, file system and block storage, and

interprocess messaging) to share the same physical interconnect, enabling that physical interconnect

to become the single unifying data center fabric. RDMA over TCP provides more efficient network

communications, which can increase the scalability of processor-bound applications. RDMA over TCP

also leverages existing Ethernet infrastructures and the expertise of IT networking personnel.

CPU

Memory

Ethernet LAN

Receiving Host

Chipset

CPU

Ethernet

NIC