Abstract: This application discloses network congestion control methods and apparatuses. In an implementation, a method comprises: obtaining, by the an intelligent network interface card comprised in a network congestion control apparatus, at least two types of traffic. Identifying, by the intelligent network interface card, algorithm matching features of the at least two types of traffic, and in response to determining to perform congestion control on one type of traffic of the at least two types of traffic, determining, by the intelligent network interface card, a congestion control algorithm that matches an algorithm matching feature of the one type of traffic. Performing, by the intelligent network interface card, congestion control on the one type of traffic according to the congestion control algorithm that matches the algorithm matching feature of the one type of traffic.

Abstract: According to embodiments, a method includes: A transmit end receives a first selective acknowledgment SACK packet from a receive end; the transmit end retransmits the at least one packet to the receive end; and the transmit end retransmits a first packet to the receive end again when the transmit end receives a second SACK packet and a packet sequence number of a packet carried in the second SACK packet is greater than or equal to the packet sequence number of the first new packet, and if the transmit end still has not received an ACK packet corresponding to the first packet in the at least one packet.

Abstract: A link state detection method is disclosed in an embodiment of the present invention. The method includes: obtaining link state information from the lowest level SE to the mid-level SE; notifying to the mid-level SE the link state information from the lowest level SE to the mid-level SE; obtaining accessibility information from the mid-level SE to the lowest level SE according to the link state information from the lowest level SE to the mid-level SE, and link state information from the mid-level SE to the first level SE; notifying the first level SE the link state information from the mid-level SE to the first level SE, and the accessibility information from the from the mid-level SE to the lowest level SE; obtaining the accessibility information from the first level SE to the lowest level SE according to the link state information and the accessibility information sent by the mid-level SE.

Abstract: A link state detection method is disclosed in an embodiment of the present invention. The method includes: obtaining link state information from the lowest level SE to the mid-level SE; notifying to the mid-level SE the link state information from the lowest level SE to the mid-level SE; obtaining accessibility information from the mid-level SE to the lowest level SE according to the link state information from the lowest level SE to the mid-level SE, and link state information from the mid-level SE to the first level SE; notifying the first level SE the link state information from the mid-level SE to the first level SE, and the accessibility information from the from the mid-level SE to the lowest level SE; obtaining the accessibility information from the first level SE to the lowest level SE according to the link state information and the accessibility information sent by the mid-level SE.