Memory Controller Hotspot Detection for Queued Access Collisions
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Solution Overview
Problem
Chiplet systems experience performance degradation due to memory hotspots, where repeated memory accesses lead to collisions and physical stress on specific memory locations, affecting reliability and efficiency.
Innovation Solution
A memory controller chiplet system employs a hashing mechanism to identify memory hotspots by tracking access requests in a queue, using hazard indicators to detect frequent access collisions, and periodically servicing the queue to redistribute memory accesses and reduce hotspot impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If memory accesses are concentrated on specific locations to simplify data access patterns, then data access efficiency is improved, but memory reliability deteriorates due to physical stress and heat generation on hotspot locations
Solution Approach 1:
The patent applies local quality by treating different memory locations differently based on their access frequency. Hotspot locations (frequently accessed) are detected and subjected to special handling through hazard indicators and queueing mechanisms, while non-hotspot locations maintain normal access patterns. This localized differentiation resolves the contradiction by protecting vulnerable hotspot areas without restricting access to regular memory locations.
2Reliability
If memory access patterns are redistributed to eliminate hotspots, then memory reliability is improved, but data access efficiency deteriorates due to increased access complexity
Solution Approach 1:
The patent introduces an intermediary mechanism between the processor and memory array: the memory controller with hazard indicators and access queues. This intermediary detects hotspot conditions and mediates access requests by queueing them appropriately, thereby redistributing access patterns without requiring changes to the processor or memory array. The intermediary resolves the contradiction by automatically managing the trade-off between reliability and efficiency.
Solution Approach 2:
The patent implements feedback through the detection and tracking of memory access patterns. The memory controller monitors access frequency to specific locations, identifies hotspots, and adjusts access patterns accordingly through hazard indicators and queueing. This closed-loop feedback system continuously optimizes the balance between memory reliability and data access efficiency without external intervention.
3Reliability
If hazard indicators and access queues are implemented to track and mitigate hotspots, then memory reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the memory controller functionality into distinct components: hazard indicator storage, access queue management, and hotspot detection logic. This segmentation allows each component to be optimized independently and simplifies the overall control architecture. The hazard indicators are stored separately in hazard indicator storage, and access queues are maintained independently, making the complexity manageable and modular.
Data Source
AI summary
Disclosed in some examples, are methods, systems, machine readable mediums, memory devices, and memory controllers that detect memory hotspots. The system keeps a count of a number of memory accesses that were queued waiting for another memory access to that address to finish. The number of memory accesses may be compared to a hotspot criteria to determine one or more memory hotspots. These hotspots may be sent to a processor, which may store the memory hotspots in a file which may be provided to an administrator.