Dynamic Memory Controller Buffer Allocation for Prefetching
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Solution Overview
Problem
Existing memory controller designs face inefficiencies in resource allocation for extended prefetching, leading to increased costs and resource consumption due to fixed buffer sizes, which do not adapt dynamically to workload demands.
Innovation Solution
A memory controller system with dynamic controls that allocates and deallocates read buffer entries and extended prefetch read buffer entries based on a buffer ratio threshold, using extended prefetch machines to determine optimal buffer sizing, allowing for dynamic adjustment of resources according to workload conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a separate extended prefetch read buffer is added to the memory controller, then prefetching performance is improved, but resource consumption and design cost increase
Solution Approach 1:
The patent implements dynamic allocation of read buffer entries between standard buffer and extended prefetch buffer based on workload conditions. The buffer allocation ratio is adjusted in real-time according to prefetch hit rates and memory access patterns, allowing the system to optimize prefetching performance while minimizing resource consumption when extended prefetching is not needed.
Solution Approach 2:
The read buffer is designed to serve multiple functions: it acts as both a standard read buffer for normal memory operations and an extended prefetch buffer for speculative loading. By making the buffer multi-functional and dynamically configurable, the system eliminates the need for separate dedicated buffers, thereby reducing overall resource consumption while maintaining prefetching capabilities.
2Device complexity
If fixed buffer sizes are used in memory controller, then design complexity is reduced, but adaptability to workload demands deteriorates
Solution Approach 1:
The patent introduces dynamic control mechanisms that automatically adjust buffer allocation based on runtime workload characteristics. The system monitors prefetch hit rates, memory access patterns, and buffer utilization metrics to dynamically reconfigure the ratio between standard and extended prefetch buffer entries, achieving high adaptability without significantly increasing design complexity.
Solution Approach 2:
The system implements feedback loops that continuously monitor prefetch performance metrics and use this information to adjust buffer allocation. The feedback mechanism compares actual prefetch hit rates against target thresholds and automatically modifies buffer configuration to optimize performance, enabling the system to adapt to varying workload demands while maintaining manageable design complexity through automated control.
Data Source
AI summary
A memory controller comprises a system bus interface that connects the MC to a system processor, a system memory interface that connects the MC to a system memory, a read buffer comprising a plurality of entries constituting storage areas, the entries comprising at least one read buffer entry (RBE) and at least one extended prefetch read buffer entry (EPRBE), read buffer logic, dynamic controls that are used by the read buffer logic, and an MC processor comprising at least one extended prefetch machine (EPM), each corresponding to one of the at least EPRBEs, where the MC processor is configured to allocate and deallocate EPRBEs and RBEs according to an allocation method using the dynamic controls.