Data Transmission Method, Computing Device, Network Device, and Data Transmission System

A network device comprising:

• a memory configured to store an executable program;
• and
• a processor coupled to the memory, wherein the executable program causes the processor to be configured to:
• receive a first data packet sent by a transmit end;
• buffer the first data packet to a low-priority queue when the first data packet is sent by the transmit end during a first round-trip time (RTT) of a data transmission phase between the transmit end and a receive end;
• receive a second data packet from the transmit end;
• buffer the second data packet to a high-priority queue when the second data packet is not sent by the transmit end during the first RTT;
• and
• forward the second data packet in the high-priority queue before the first data packet in the low-priority queue.

A network device comprising:

• a memory configured to store an executable program;
• and
• a processor coupled to the memory, wherein the executable program causes the processor to be configured to:
• receive a data packet sent by a transmit end to a receive end;
• discard the data packet when the data packet is sent by the transmit end during a first round-trip time (RTT) of a data transmission phase between the transmit end and the receive end and when a quantity of data packets in a receive queue of the network device exceeds a threshold;
• and
• add the data packet to the receive queue when the data packet is not sent by the transmit end during the first RTT and the receive queue is not full.

A network interface card comprising:

• an input/output port;
• and
• a processor coupled to the input/output port and configured to:
• send a plurality of first data packets during a first round-trip time (RTT) of a data transmission phase between a transmit end and a receive end through the input/output port;
• and
• add a first tag to each of the first data packets before sending the first data packets to enable a network device to buffer the first data packets to a low-priority queue or to discard the first data packets after receiving the first data packets;
• and
• send a plurality of second data packets to the network device to enable the network device to buffer the second data packets to a high-priority queue of the network device such that the second data packets are forwarded before the first data packets, and wherein the second data packets do not carry the first tag.