Reducing buffer usage for TCP proxy session based on delayed acknowledgement
First Claim
1. A method for reducing memory usage of a service gateway buffer resident in a memory module of a service gateway for a Transmission Control Protocol (TCP) proxy session between a client and a server by adjusting server side session transmission time to reduce buffer usage, comprising:
- determining a first round trip time (RTT) for a server side TCP session of the TCP proxy session between the service gateway and the server, the first RTT being estimated based at least on an average of one or more prior server side TCP sessions with the server;
determining a second RTT for the client side TCP session of the TCP proxy session between the service gateway and the client, the second RTT being estimated based at least on an average of one or more prior client side TCP sessions with the client;
comparing the first RTT with the second RTT by the service gateway;
determining that the second RTT exceeds the first RTT;
comparing a difference between the second RTT and the first RTT;
in response to determining that the difference is above a predetermined threshold, calculating by the service gateway a desired RTT based on the second RTT, the calculation based at least in part on a memory capacity of server side receive buffer; and
setting a timer by the service gateway according to the calculated desired RTT, wherein a TCP acknowledgement for the server side TCP session is delayed until the service gateway determines that the timer expires.
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Accused Products
Abstract
Reducing buffer usage for a TCP proxy session between a client and a server by a service gateway includes: determining a first round trip time (RTT) for a server side TCP session and determining a second RTT for a client side TCP session; comparing the first RTT with the second RTT; determining whether the second RTT exceeds the first RTT beyond a threshold; if so, then calculating a desired RTT based on the second RTT; and setting a timer according to the calculated desired RTT, where a TCP acknowledgement for the server side TCP session is delayed until the timer expires. The desired RTT may be calculated as a percentage of the second RTT or as the second RTT minus a predetermined value. The service gateway waits until the timer has expired before sending a TCP acknowledgement data packet to the server.
204 Citations
17 Claims
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1. A method for reducing memory usage of a service gateway buffer resident in a memory module of a service gateway for a Transmission Control Protocol (TCP) proxy session between a client and a server by adjusting server side session transmission time to reduce buffer usage, comprising:
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determining a first round trip time (RTT) for a server side TCP session of the TCP proxy session between the service gateway and the server, the first RTT being estimated based at least on an average of one or more prior server side TCP sessions with the server; determining a second RTT for the client side TCP session of the TCP proxy session between the service gateway and the client, the second RTT being estimated based at least on an average of one or more prior client side TCP sessions with the client; comparing the first RTT with the second RTT by the service gateway; determining that the second RTT exceeds the first RTT; comparing a difference between the second RTT and the first RTT; in response to determining that the difference is above a predetermined threshold, calculating by the service gateway a desired RTT based on the second RTT, the calculation based at least in part on a memory capacity of server side receive buffer; and setting a timer by the service gateway according to the calculated desired RTT, wherein a TCP acknowledgement for the server side TCP session is delayed until the service gateway determines that the timer expires. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A non-transitory computer readable medium with computer readable program code embodied therewith for reducing memory usage of a service gateway buffer resident in a memory module of a service gateway for a Transmission Control Protocol (TCP) proxy session between a client and a server by adjusting server side session transmission time to reduce buffer usage, the computer readable program code configured to:
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determine a first round trip time (RTT) for a server side TCP session of the TCP proxy session between a service gateway and the server, the first RTT being estimated based at least on an average of one or more prior server side TCP sessions with the server; determine a second RTT for the client side TCP session of the TCP proxy session between the service gateway and the client, the second RTT being estimated based at least on an average of one or more prior client side TCP sessions with the client; compare the first RTT with the second RTT by the service gateway; determine that the second RTT exceeds the first RTT; compare a difference between the second RTT and the first RTT; in response to determining that the difference is above a predetermined threshold, calculate a desired RTT based on the second RTT, the calculation based at least in part on a memory capacity of server side receive buffer; and set a timer by the service gateway according to the calculated desired RTT, wherein the TCP acknowledgement for the server side TCP session is delayed until the service gateway determines that the timer expires. - View Dependent Claims (9, 10, 11, 12)
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13. A system for reducing memory usage of a service gateway buffer for a Transmission Control Protocol (TCP) proxy session between a client and a server by adjusting server side session transmission time to reduce the buffer usage, the system comprising:
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a service gateway comprising a processor, a memory module, and a server side receive buffer residing in the memory module, wherein a server side TCP session of the TCP proxy session is established between the service gateway and the server, and a client side TCP session of the TCP proxy session is established between the service gateway and the client, wherein the service gateway; determines a first round trip time (RTT) for a server side TCP session of the TCP proxy session between the service gateway and the server the first RTT being estimated based on at least an average of one or more prior server side TCP sessions with the server; determines a second RTT for the client side TCP session of the TCP proxy session between the service gateway and the client, the second RTT being estimated based at least on an average of one or more prior client side TCP sessions with the client; compares the first RTT with the second RTT; determines that the second RTT exceeds the first RTT; compares a difference between the second RTT and the first RTT; in response to determining that the difference is above a predetermined threshold, calculates a desired RTT based on the second RTT, the calculation based at least in part on a memory capacity of server side receive buffer; and sets a timer according to the calculated desired RTT, wherein the TCP acknowledgement for the server side TCP session is delayed until the timer expires. - View Dependent Claims (14, 15, 16, 17)
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Specification