Buffer configuration method and device

Abstract

The invention relates to a data transmission technology, and discloses a buffer configuration method for solving the problem that in the prior art, a DMA data transmission system is large in buffer memory occupation. The method comprises the steps that A, a buffer descriptor (BD) ring with the length of n is established and initialized to be in a non-receivable state, wherein n is a positive integer and is determined by system parameters; B, m buffers are applied for and stored in a buffer pool, wherein m is a positive integer and is smaller than n; C, k buffers are applied for and attached to first k BDs of the BD ring, the corresponding BDs are set to be in a receivable state, and hardware is started for reception, wherein k is a positive integer and is smaller than or equal to m; D, after DMA data reception of the BDs is completed, the number z of the BDs of which reception is completed currently is queried, z buffers are taken from the buffer pool and attached behind the kth BD of the BD ring, the corresponding BD is set to be in a receivable state, the reception semaphore is released, and a reception task is awaken. The algorithm is simple, and buffer memory occupation can be reduced without influencing performance.

Description

technical field [0001] The invention relates to data transmission technology, in particular to a data transmission system buffer configuration method and device. Background technique [0002] With the rapid development of the network, the performance of network equipment has been greatly improved. Taking router equipment as an example, the interface speed has developed from the previous 100M port to the current 10M port. In the form of presentation, the number of solidified ports and expandable ports is also increasing. The improvement of network equipment performance will inevitably require a corresponding increase in CPU processing speed and memory capacity. For any kind of device, memory is an important resource. Under the condition of certain performance, the software consumes as little memory as possible. [0003] Among data communication devices, a router is a data routing device that works at the edge of the network. Each communication interface in a router may di...

AI Technical Summary

Problems solved by technology

But there is a disadvantage: at any time the BD ring is full, taking up n buffers

[0029] For the above two solutions, the defects are not obvious on low-speed and low-density interfaces, but once on high-speed and high-density devices, the number of caches occupied will be large, and the defects will be very obvious

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