Systems, devices, and methods for network congestion control

A method for reducing congestion in a network, the method comprising:

• transmitting a packet to another network adapter via a first flow through the network, wherein the first flow comprises multiple hops;
• receiving, in response to transmitting the packet, a response packet from the other network adapter, wherein the response packet comprises distinct telemetry data for each hop of the first flow;
• and
• determining, in response to receiving the response packet, hop rates for each of the multiple hops of the first flow using the telemetry data, wherein determining hop rates comprises determining a hop rate for a given hop based on at least one of a current state of the given hop, a queue length of the given hop, and a link utilization of the given hop.

A network adapter coupled to a network, the network adapter comprising:

• a port configured to transmit and receive packets on a network;
• and
• circuitry communicatively coupled to the port, wherein the circuitry is configured to:
• transmit, using the port, a packet to another network adapter via a first flow through the network, wherein the first flow comprises multiple hops;
• receive, at the port and in response to transmitting the packet, a response packet from the other network adapter, wherein the response packet comprises distinct telemetry data for each hop of the first flow;
• and
• determine, in response to receiving the response packet, hop rates for each of the multiple hops of the first flow using the telemetry data, wherein determining hop rates comprises determining a hop rate for a given hop based on at least one of a current state of the given hop, a queue length of the given hop, and a link utilization of the given hop.