Data flow control for dual ended transmission control protocol performance enhancement proxies

A non-transitory machine-readable storage medium storing a program having instructions which when executed by a processor will cause the processor to:

• receive flow control information from across a control channel between the PEP1 and the PEP2, the flow control information including round-trip packet latency measurement (Li) on the client-facing segment and transmit buffer congestion window information of the PEP1, wherein the flow control information is for each TCP connection on the client-facing segment;
• determine whether each TCP connection of the client-facing segment has a congested TCP packet flow;
• and
• for each TCP connection of the client-facing segment having a congested TCP packet flow, synchronize a receive buffer receive window size of the PEP2 to be the same as a transmit buffer congestion window size of the PEP1;
• determine a round-trip packet latency Lr on the server-facing segment of the computer network;
• and
• set the throughput of the server facing segment of the PEP2 to be a function of the receive buffer receive window size of the PEP2 and whichever is smaller of the Li and Lr.

A data flow control process across a computer network comprising a first performance enhancing proxy device (PEP1) on a client-facing segment of the network and a second performance enhancing proxy device (PEP2) on a server-facing segment of the network, the flow control process comprising:

• receiving flow control information from across a control channel between the PEP1 and the PEP2, the flow control information including round-trip packet latency measurement (Li) on the client-facing segment and transmit buffer congestion window information of the PEP1, wherein the flow control information is for each TCP connection on the client-facing segment;
• determining whether each TCP connection of the client-facing segment has a congested TCP packet flow;
• and
• for each TCP connection of the client-facing segment having a congested TCP packet flow, synchronizing a receive buffer receive window size of the PEP2 to be the same as a transmit buffer congestion window size of the PEP1;
• determining a round-trip packet latency Lr on the server-facing segment of the computer network;
• and
• setting the throughput of the server facing segment of the PEP2 to be a function of the receive buffer receive window size of the PEP2 and whichever is smaller of the Li and Lr.