Memory Controller Data Access Hint Mechanism
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Solution Overview
Problem
Current data processing systems face challenges in reducing latency during data access requests, particularly when requests need to be routed through multiple nodes, leading to increased latency and inefficiencies in bandwidth usage.
Innovation Solution
The implementation of a memory controller with predictor circuitry that sends a data access hint message to initiate data access, allowing the memory controller to start the data access process early, and only completes it when a subsequent data access request is received, thereby reducing latency and conserving bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data access requests are routed through multiple nodes (HN-F, SN-F) to ensure coherence and proper ordering, then data consistency and serialization are maintained, but latency increases due to the additional routing steps
Solution Approach 1:
The system sends a data access hint message from the RN-F to the SN-F before the actual data access request. This preliminary action allows the SN-F to prepare for the incoming request by checking its local caches and determining whether it can fulfill the request, thereby reducing the latency when the actual request arrives while maintaining data consistency through proper coherence protocol handling.
2Loss of time
If the memory controller initiates data access immediately upon receiving a data access hint message, then latency is reduced, but bandwidth is wasted if the subsequent actual request is not received
Solution Approach 1:
The memory controller dynamically adjusts its behavior based on whether an actual data access request is received after sending the hint message. If the request is received, the controller completes the data access using the pre-initiated transfer. If not received, the controller aborts the hint-initiated access. This dynamic approach allows the system to reduce latency when beneficial while conserving bandwidth when unnecessary, making the system adaptable to actual runtime conditions.
Data Source
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AI summary
A memory controller comprises memory access circuitry configured to initiate a data access of data stored in a memory in response to a data access hint message received from another node in data communication with the memory controller; to access data stored in the memory in response to a data access request received from another node in data communication with the memory controller and to provide the accessed data as a data access response to the data access request.