DMA transmission method, device and equipment

Abstract

The invention discloses a DMA transmission method comprising the steps of determining transmission data according to a received DMA transmission request, and locking physical pages corresponding to the transmission data; traversing the physical pages, judging whether the number of continuous physical pages reaches a predetermined number, if yes, filling an idle descriptor, and if no, filling the idle descriptor based on the acquired continuous physical page until all the physical pages are traversed; writing the idle descriptors into a descriptor space of a writing board card end; and sendingthe transmission data to the board card end. According to the method, the data size for starting DMA transmission each time is increased, the method is applicable to multi-thread DMA transmission, andthe transmission efficiency is greatly improved. The invention also discloses a DMA transmission device and DMA transmission equipment, both having the beneficial effects above.

Description

technical field [0001] The invention relates to the field of computer data transmission, in particular to a DMA transmission method, and also to a DMA transmission device and equipment. Background technique [0002] In recent years, with the rapid growth of the mobile Internet, the volume of data has expanded rapidly, and the computing demand for these data has also increased rapidly. To cope with this urgent computing demand, an effective solution is to use a heterogeneous computing method of a dedicated coprocessor to improve processing performance. Existing coprocessors mainly include Field Programmable Gate Array (FPGA), Graphics Processing Unit (GPU) and Integrated Circuit (ASIC). FPGA has been focused on because of its unique architecture which has advantages unmatched by other processors. [0003] The FPGA chip usually contains a DMA controller, which performs data transmission between the host end and the board end in the form of DMA. Please refer to figure 1 , f...

AI Technical Summary

Problems solved by technology

Because if the user program is multi-threaded, after a thread initiates data transmission, it turns into a waiting state and waits to be scheduled. After each descriptor transmission, it needs to wait for the thread to be scheduled to wake up before starting the next description transmission, which greatly affects transmission efficiency

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