Bandwidth distribution method based on PCIe transaction layer data transmission

Abstract

The invention belongs to the computer hardware field and especially relates to a bandwidth distribution method based on PCIe transaction layer data transmission. The method comprises the following steps of step1, under a normal condition, using a fixed priority to arbitrate a sending source data packet sending sequence, wherein the priority is a PCIeDMA sending data packet, a PCIeDMA receiving request packet, a PCIe read access return packet from high to low; and step2, under the condition that a system requires that there is a data source sent by at least one data packet in certain time, whena time limit is reached, giving a highest priority, and when the sending is completed, restoring the priority to an original state; and if before the time limit, sending the data source because a sending pathway is idle, sending a time limit timer so as to counting from an initial value. In the invention, based on the condition of maximumly increasing a PCIe bandwidth utilization rate, a specifictransaction layer sending source is guaranteed not to be ''starved'' so that a purpose of optimizing PCIe transaction layer data transmission bandwidth distribution is reached.

Description

Technical field [0001] The invention belongs to the field of computer hardware, and particularly relates to a bandwidth allocation method based on PCIe transaction layer data transmission. Background technique [0002] In modern computer systems, the host interface generally adopts PCIe bus interface. A typical PCIe bus application can reach 10GBps (16lane, 5Gbps). Therefore, in practical applications, the PCIe user-side logic design can make full use of such a high-speed bus. The essential. Summary of the invention [0003] Purpose of the invention: [0004] The purpose of the present invention is to provide a bandwidth allocation method based on PCIe transaction layer data transmission to solve the problem of low PCIe bandwidth utilization due to unreasonable bandwidth allocation during the design of PCIe client logic, or cause individual data sources to be sent Failure to apply for the right to use the bus for a long time affects the system's work. [0005] Technical solutions: ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a bandwidth allocation method based on PCIe transaction layer data transmission, in order to solve the problem of low PCIe bandwidth utilization due to unreasonable bandwidth allocation in the design of PCIe client logic, or cause individual transmission data sources Failure to apply for the right to use the bus for a long time will affect the system work