Method of reducing message transmission overhead of parallel multi-digital signal processor

Abstract

The invention discloses a method for decreasing the spending of information transfer between paralleled multi-digital signal processors; wherein, the data receiving and transmitting between each digital signal processor are realized by LINK port; before transmitting data, the digital signal processor in the transmitter transmits a control frame to make clear the length and the type and so on for the transmitted data firstly; the digital signal processor in the receiver sets the relative receiving address and the length of the receiving data according the type and the length of the received frame; and then the digital signal processor in the transmitter transmits the actual data frame, in this way, the data can be transmitted to the destination directly without needing double buffer. So the invention not only can save the storage room, but also can save the time for copying data. The invention can realize information zero-copy communication in deed by DMA and the relative break treatment program, which can decrease the burden for DSP core in the most degree, shorten the communication spending greatly and obtain a much better practice effect.

Description

technical field [0001] The invention relates to a method capable of reducing message passing overhead among multiple digital signal processors (abbreviated as DSPs) in a loosely coupled parallel processing system based on a message passing mechanism, and belongs to the technical field of signal processing and communication. Background technique [0002] At present, DSP is being widely used in the field of signal processing, especially in image signal processing. However, as the processing capability requirements for signal processing boards are getting higher and higher, for example, the real-time processing of high-frame number and large-size image sequences often requires billions of calculations per second. Currently, the single-chip DSP It is impossible to meet its requirements for computing power, which requires the signal processing board to adopt a multi-DSP parallel processing structure in the design to meet the system's requirements for computing power. [0003] In...

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Problems solved by technology

[0007] However, the current zero-copy technology often uses DMA and memory remapping to realize zero-copy of data packets between the user buffer and the core buffer. The application is closely integrated, and it cannot be regarded as zero copy in the true sense, and there is still potential to be tapped

In addition, in the prior art, the data is not directly taken out from the memory where it is located and sent out through the communication interface, nor is the received data directly put into the destination memory, and a copy is still required. If this copy process can be removed, further Reduce communication overhead

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