Dynamic DMA Buffer Management for CATV Data Forwarding

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Solution Overview

Problem

In Cable Television (CATV) systems, the fixed Maximum Transmission Unit (MTU) size for DMA buffers leads to wasted cache and poor data forwarding performance due to unused buffer space when receiving data packets of smaller MTU sizes.

Innovation Solution

Implementing dynamic DMA buffer management by initially setting a minimum MTU size for DMA buffers and dynamically reconfiguring them based on the size of received data packets, ensuring optimal buffer utilization and performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If fixed MTU size is used for DMA buffers, then buffer allocation is simple, but buffer utilization is poor and data forwarding performance deteriorates

Engineering Contradiction:

Improvebuffer allocation simplicityVSAvoiddata forwarding performance

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent implements dynamic DMA buffer management where the MTU size is no longer fixed but can be adjusted based on actual data packet sizes. The system dynamically reconfigures DMA buffer parameters including MTU size, buffer count, and buffer size to match the characteristics of incoming data traffic, thereby optimizing buffer utilization and data forwarding performance without sacrificing allocation simplicity

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes key parameters of DMA buffers including MTU size, number of buffers, and buffer size based on detected data packet characteristics. By monitoring data traffic patterns and adjusting these parameters dynamically, the system achieves optimal buffer utilization for varying data sizes while maintaining simple allocation through automated parameter adaptation

Inventive Principle:

Principle #35Parameter changes

2Reliability

If larger DMA buffers are allocated to handle maximum MTU sizes, then large packets can be handled, but cache is wasted when receiving smaller packets

Engineering Contradiction:

Improveability to handle maximum packet sizeVSAvoidwasted cache

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The system dynamically adjusts DMA buffer sizes based on the actual size of incoming data packets. When small packets are detected, the system reconfigures DMA buffers to match the smaller size, eliminating wasted cache space. When large packets arrive, the buffers are expanded to accommodate them, ensuring reliable handling of maximum packet sizes without permanent over-allocation

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements automatic adjustment of DMA buffer parameters including buffer size and MTU based on detected data packet sizes. This parameter adaptation allows the system to allocate exactly the right amount of buffer space for each data flow, preventing cache waste for small packets while maintaining the capability to handle maximum sized packets when needed

Inventive Principle:

Principle #35Parameter changes

3Productivity

If dynamic reconfiguration of DMA buffers is implemented, then buffer utilization is optimized, but system complexity increases

Engineering Contradiction:

Improvebuffer utilization efficiencyVSAvoidbuffer management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system implements self-service dynamic buffer management where the DMA controller automatically detects data packet sizes and reconfigures buffer parameters without external intervention. The system monitors incoming traffic patterns and autonomously adjusts MTU size, buffer count, and buffer size, reducing the perceived complexity for system operators while maintaining high buffer utilization efficiency

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent incorporates feedback mechanisms where the system continuously monitors data packet sizes and buffer utilization patterns, then uses this information to automatically adjust DMA buffer configurations. This closed-loop control optimizes buffer utilization efficiency while managing complexity through automated feedback-driven adaptation rather than manual configuration

Inventive Principle:

Principle #23Feedback

4Stability of the object's composition

If fixed buffer configuration is used, then system stability is maintained, but adaptability to varying data sizes is poor

Engineering Contradiction:

Improvesystem stabilityVSAvoidadaptability to varying MTU sizes

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The system maintains stability through controlled dynamic adaptation. While DMA buffer parameters can be adjusted, the system does so in a managed manner that preserves overall system stability. The dynamic reconfiguration responds to actual data traffic patterns rather than making arbitrary changes, ensuring that stability is maintained while adaptability to varying data sizes is significantly improved

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12265493B2Dynamic DMA buffer management

Publication Date: 2025.04.01 ARRIS ENTERPRISES LLC

AI summary

A system that includes dynamic DMA buffer management.