Method and device for message transmission

Abstract

The invention discloses a method and a device for message transmission. The method includes the steps as follows: a sender sets asides at least two queue elements for a control channel when the control channel is in an idle state and sets asides at least N+1 queue elements for the control channel when N control messages are to be sent; the sender fills up a control transmission negotiation request message to a sending queue for sending before sending the control message and controls the number of data messages which are sent by a data channel to be not exceed a preset value before receiving a corresponding control transmission negotiation response message; and the sender respectively sets a first sign to the N control messages and then fills up the control messages to the sending queue for sending after receiving the corresponding control transmission negotiation response message. The invention realizes reasonable distribution of bandwidth of a logical channel on a physical channel and can avoid channel jamming when the control messages are transmitted.

Description

technical field [0001] The invention relates to a distributed system, in particular to a message transmission method and device in the distributed system. Background technique [0002] The subsystems of the distributed router (the meaning of the subsystem in this paper includes the main system) are connected through physical channels, and the physical channels are divided into two logical channels according to the communication content: control channel and data channel, and the hardware queue is responsible for the message Transmitting and transceiving between logical channels and physical channels. In the sending direction, after the logical channel puts the packets into the sending queue, the hardware sends the packets in the sending queue to the physical channel in turn; in the receiving direction, the hardware receives the messages from the physical Get the message from the queue and process it. Therefore, the bandwidth allocation of the logical channel on the physical...

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Problems solved by technology

[0021] (1) When the control message is sent, the control message is retransmitted because the send queue of the local end is completely occupied by the data channel

[0022] (2) After the control message is sent, because the receiving queue at the peer end is completely occupied, that is, the path is congested, the loss of the control message leads to retransmission

[0023] (3) When the opposite end sends an ACK after receiving the control message, the ACK is discarded because the send queue of the opposite end is completely occupied by the data channel, causing the control message to be retransmitted

[0024] (4) After the peer end receives the control message and sends ACK, the receiving queue of the local end is completely occupied, that is, the channel is congested, and the ACK loss causes the control message to be retransmitted

[0029] (1) After the control message is sent, because the receiving queue at the peer end is completely occupied, that is, the path is congested, the loss of the control message leads to retransmission

[0030] (2) After the peer end receives the control message and sends ACK, because the receiving queue of the local end is completely occupied, that is, the channel is congested, the ACK is lost and the control message is retransmitted

[0034] (1) After the control message is sent, because the receiving queue at the peer end is completely occupied, that is, the path is congested, the loss of the control message leads to retransmission

[0035] (2) After the peer end receives the control message and sends ACK, because the receiving queue of the local end is completely occupied, that is, the channel is congested, the ACK is lost and the control message is retransmitted

[0036] The above reasons lead to multiple retransmissions of the control message, wasting the bandwidth of the physical channel, and reducing the timeliness and reliability of the control channel.

ACK transmission occupies the bandwidth of the control channel, which reduces the effective utilization of the control channel; the implementation of the retransmission module is relatively complicated, which increases the reliability risk of the control channel

Moreover, adding new physical paths increases the system cost, and the characteristics of the small amount of control transmission determine that the idle rate of the newly added physical paths is high, which wastes physical bandwidth. Hardware support is required, and the application range of the solution is limited by the actual hardware design

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