Flow-control information transfer method and device

Abstract

The invention discloses a flow-control information transfer method and device. The method comprises the following steps: reading a flow-control point identification in a preset flow-control point identification library, wherein flow-control point identifications are stored in the flow-control point identification library in the mode of first in the first out (FIFO) and each flow-control point identification in the flow-control point identification library has uniqueness; and searching a flow-control state table which stores flow-control states in one-to-one correspondence with the flow-control point identifications in the flow-control point identification library, reading the corresponding flow-control state of the read flow-control point identification; and generating flow-control information to transmit according to the read flow-control point identification and flow-control state. The invention can realize the predictability of flow-control information storage resources, thus avoiding the problem that the flow-control information of the same flow-control point is stored many times and occupies lots of resources and then reducing the transfer delay of flow-control information.

Description

technical field [0001] The present invention relates to the technical field of flow control, and more specifically, to a method and device for transmitting flow control information. Background technique [0002] The basic function of the packet switching network is to realize data exchange between multiple switching network ports, that is, to switch data from N input ports to M output ports. When the total data flow sent to an output port exceeds the processing capacity of the output port, the output port will be congested. In order to avoid data loss, a certain capacity buffer will be set at the output port to store the congested data. However, due to the limited buffer capacity, if the total flow of data sent to the output port is not reduced in time, the data will eventually overflow and be lost. [0003] The flow control mechanism in the packet switching network system is used to monitor whether the output port is in a congestion state. Once it occurs, the congestion st...

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Problems solved by technology

[0004] Depend on figure 2 It can be seen that for the same data channel, flow control information may be frequently generated between the generation of congestion state and the release of congestion state, and the flow control information generated by the same data channel will be stored in the same flow control information storage device. At the same time, for the same data channel, the flow control information indicating the congestion state generated earlier is already invalid flow control information compared to the flow control information indicating the congestion state generated later, and these invalid flow control information will also be is stored, so that the flow control information storage device stores a large amount of redundant flow control information. In this way, the storage resources of the flow control information will be insufficient, resulting in excessive bandwidth occupied by the flow control information, thereby increasing the transmission delay of the flow control information

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