TCP Proxy Buffer Management in Gigabit Networks
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Solution Overview
Problem
In TCP/IP data communication, TCP proxies face inefficiencies due to waiting for client applications to 'pull' data from transmit buffers, leading to reduced data communication efficiency and increased memory requirements for managing multiple connections.
Innovation Solution
A TCP proxy server manages data buffers and control memory independently by monitoring buffer usage and 'pushing' data into buffers, eliminating the need for client data requests and optimizing memory allocation by dividing control blocks into flow and connection entries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TCP proxy waits for client application to pull data from transmit buffers, then memory management is simplified, but data communication efficiency is reduced
Solution Approach 1:
The TCP proxy proactively pushes data from receive buffers to transmit buffers before the client application requests it, eliminating the waiting period and improving data communication efficiency. This preliminary action of pre-loading data into transmit buffers resolves the contradiction by initiating data transfer in advance rather than reacting to client pull requests.
Solution Approach 2:
The system monitors transmit buffer space availability and dynamically adjusts data pushing behavior based on real-time buffer status feedback. This feedback mechanism allows the TCP proxy to optimize buffer management by pushing data when transmit buffers have space while avoiding overflow conditions, thus improving efficiency without overwhelming complexity.
2Adaptability or versatility
If TCP proxy supports multiple simultaneous connections, then service capability is improved, but memory requirements increase
Solution Approach 1:
The control block is divided into two independent segments: connection block entry and flow entry. The connection block entry manages connection-level resources while the flow entry handles data flow specifics. This segmentation allows more connections to be managed with reduced memory per connection, as connection block entries can be released when no longer needed while flow entries continue processing active data transfers.
Solution Approach 2:
The system dynamically manages memory allocation by releasing connection block entries when connections are closed or paused, while maintaining flow entries for active data transfers. This dynamic memory management allows the TCP proxy to support multiple simultaneous connections with optimized memory consumption, adapting memory usage to actual connection states rather than allocating fixed resources.
3Productivity
If fixed window size is used for multiple connections, then configuration is simplified, but data transfer optimization is reduced
Solution Approach 1:
The system dynamically adjusts data window sizes based on real-time buffer availability and client pull requests rather than using fixed window sizes. This dynamic adaptation allows optimal data transfer efficiency by matching window sizes to actual buffer capacity and demand, resolving the contradiction between simplified configuration and optimized data transfer.
Data Source
AI summary
The present invention describes a method and apparatus to effectively manage data buffers for a client and a server connection in a multiple connection environment. The TCP processes of servers and clients are merged into an independent TCP process in a TCP ‘proxy’ server. The TCP proxy server includes a control unit and a data switching unit (the proxy application). The TCP proxy server terminates the client TCP connection and initiates a separate TCP connection with the server. The data switching unit binds the two individual connections. The TCP proxy server portrays the actual server TCP. The control unit in the TCP proxy server manages data buffers, control memory and supports multiple connections. The control unit ‘pushes’ the data into the buffers by monitoring the use of the buffers. The control unit does not wait for data requests from the data switching unit thus, eliminating the overhead of data request messages.