Dynamic Credit Allocation in Memory Subsystems
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Solution Overview
Problem
Existing memory controllers in systems on chips (SoCs) statically allocate credits to clients and traffic classes, which does not dynamically adjust to actual transaction traffic, thereby not maximizing bandwidth at the memory interface.
Innovation Solution
Implementing a feedback mechanism where the memory controller monitors transaction request statistics and provides signals to the credit controller or clients to dynamically modulate credit allocations, thereby optimizing bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If credit allocations are statically assigned to clients and traffic classes, then the system structure is simple and easy to manage, but the bandwidth at the memory interface is not maximized because allocations do not adapt to actual transaction traffic
Solution Approach 1:
The patent implements a feedback mechanism where the memory controller monitors buffer occupancy statistics and provides feedback signals to the credit controller. This feedback loop enables dynamic adjustment of credit allocations based on actual traffic conditions, resolving the contradiction between simple static allocation and maximizing bandwidth through adaptive allocation.
Solution Approach 2:
The patent transitions from static credit allocation to dynamic credit allocation by enabling the credit controller to modulate credit assignments in real-time based on feedback from the memory controller. This dynamic adjustment allows the system to adapt to varying traffic patterns and maximize memory interface bandwidth utilization.
2Productivity
If the memory controller monitors and dynamically adjusts credit allocations, then bandwidth utilization is maximized, but the system complexity increases due to additional monitoring and feedback mechanisms
Solution Approach 1:
The memory controller monitors buffer occupancy statistics and generates feedback signals to indicate when credit allocations should be increased or decreased. This feedback mechanism enables automatic dynamic adjustment without requiring complex centralized control, as the memory controller itself generates the optimization signals based on its observed buffer states.
Solution Approach 2:
The memory controller performs self-monitoring of its buffer occupancy and generates its own feedback signals for credit allocation optimization. This self-service approach reduces the need for external complex monitoring systems, as the memory controller autonomously identifies when credit adjustments would improve bandwidth utilization.
3Adaptability or versatility
If static credit allocation is used, then the system is easier to implement and maintain, but it cannot adapt to varying transaction traffic patterns
Solution Approach 1:
The patent implements dynamic credit allocation where the credit controller can modulate credit assignments in real-time based on feedback from the memory controller. This dynamic system adapts to varying transaction traffic patterns by increasing credits during high-traffic periods and decreasing them during low-traffic periods, providing adaptability that static allocation cannot achieve.
Solution Approach 2:
The patent changes the credit allocation parameter dynamically based on observed buffer occupancy statistics. The system monitors traffic patterns and adjusts the number of credits assigned to different clients and traffic classes, enabling adaptability to varying traffic conditions while maintaining a relatively simple credit allocation structure.
Data Source
AI summary
This document describes systems and techniques for modulating credit allocations in memory subsystems. The described systems and techniques can provide a feedback mechanism to a credit controller to improve the bandwidth at a memory interface. The memory controller monitors statistics associated with transaction requests served to one or more random access memories (RAMs) of the memory subsystem. The memory controller can then provide suggestions to the credit controller or to the one or more clients to modulate the number of credits allocated to one or more clients. In this way, the described systems and techniques can improve the efficiency of the memory controller in managing the transaction requests and the bandwidth at the memory interface.