Communication method based on RapidIO protocol and RDMA technology

Abstract

The invention discloses a communication method and device based on a RapidIO protocol and an RDMA technology. The method comprises the following steps: enabling a transmitter to register a first userstate data area that stores data to be transmitted to a first kernel; using a doorbell message to acquire a physical address that is registered to a second kernel by a second user state data area sentby a receiver; and transmitting the data to be transmitted to the physical address in the second kernel by using RDMA transmission. According to the communication method and device disclosed by the invention, a hardware interconnection protocol between processors uses the RapidIO protocol, and the problems of interconnections between integrated chips of the processors and between circuit boards can be solved; and the data to be transmitted that is registered to the first kernel of the transmitter is transmitted to the physical address that is registered to the second kernel of the receiver bythe second user state data area through the RDMA transmission, the data copy between the user state and the kernel state can be avoided, the memory copy and communication overhead can be reduced, andthus the network bandwidth between communication interfaces can be improved.

Description

technical field [0001] The present invention relates to the technical field of data transmission, in particular to a communication method and device based on RapidIO protocol and RDMA technology. Background technique [0002] In a traditional embedded multiprocessor system, the interconnection between processors is realized by time-sharing the bus, and all communications compete for the bus bandwidth, resulting in more processors, and the available bandwidth of each processor is reduced. The less, resulting in a serious system information transmission capacity bottleneck. [0003] RapidIO is a system interconnection technology jointly proposed by Motorola and Mercury. It is a high-performance, low-pin-count, system-level interconnection protocol based on packet switching, with extremely low latency and high bandwidth. The proposal of RapidIO bus technology eliminates the bottleneck problem of bandwidth, and successfully solves the interconnection problem between processor i...

AI Technical Summary

Problems solved by technology

However, even with the support of high-speed hardware interconnection protocols, it is still very difficult to provide high-speed communication interfaces to end users. Redundant memory copies and heavy communication overheads are becoming more and more bottlenecks that affect the performance of multi-processor communication. , the currently public RapidIO communication interface realized by using the Ethernet emulator only plays 10% of the RapidIO communication performance

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