Memory Controller Stream Switching for Buffer Utilization
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Solution Overview
Problem
Current memory systems face inefficiencies in data transfer and writing performance due to the need to manage multiple streams simultaneously, leading to reduced capacity utilization in write buffers and increased data-in times, especially when stream workloads are uneven.
Innovation Solution
The memory system employs a dual operational mode where the memory controller prioritizes data transfer by switching between streams based on workload ratios, ensuring that the write buffer capacity is fully utilized for a single stream during data-in operations, thereby optimizing data writing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the memory system manages multiple streams simultaneously, then the multi-stream write function is achieved, but the write buffer capacity utilization is reduced and data-in time is increased
Solution Approach 1:
The memory controller dynamically switches between single-stream mode and multi-stream mode based on the number of active streams. When only one stream is active, the system operates in single-stream mode to maximize write buffer utilization and minimize data-in time. When multiple streams are active, the system transitions to multi-stream mode to handle concurrent write operations, thereby adapting the data transfer method to current workload conditions
Solution Approach 2:
The system changes the operational parameter of stream handling from fixed multi-stream to dynamic mode selection. The memory controller monitors the number of active streams and adjusts the data transfer method accordingly, changing between single-stream and multi-stream operations based on real-time conditions, which optimizes both buffer utilization and data-in time according to actual workload
2Adaptability or versatility
If the memory system uses multi-stream write operations, then stream diversity is supported, but write buffer capacity utilization is reduced
Solution Approach 1:
The memory controller dynamically adjusts the data transfer method based on the number of active streams. When a single stream is active, the system uses single-stream data transfer to fully utilize write buffer capacity. When multiple streams are active, it switches to multi-stream data transfer to handle diverse stream requirements, thereby dynamically optimizing buffer utilization according to actual stream diversity
Solution Approach 2:
The system changes the operational parameter of data transfer method between single-stream and multi-stream modes based on the number of active streams. This parameter change allows the system to maintain high write buffer capacity utilization when possible while still supporting stream diversity when required by the workload
3Productivity
If the memory controller switches between single-stream and multi-stream modes, then data transfer efficiency is optimized, but control complexity is increased
Solution Approach 1:
The memory controller monitors the number of active streams as a key parameter and changes the data transfer method based on this parameter value. When the number of active streams is one, it selects single-stream mode; when multiple streams are active, it selects multi-stream mode. This simple parameter-based decision logic optimizes data transfer efficiency while keeping control complexity manageable
Solution Approach 2:
The memory controller implements feedback by monitoring the number of active streams and adjusting the data transfer method accordingly. This feedback mechanism allows the system to automatically optimize data transfer efficiency based on current workload conditions without requiring complex external control, as the controller self-adjusts based on stream activity feedback
Data Source
AI summary
A memory system includes a non-volatile memory and a memory controller. The memory controller is configured to queue write commands received from a host. The commands may include a first write command to write first write data associated with a first stream and a second write command to write second write data associated with a second stream. When the first and second write commands are queued, the memory controller repeatedly performs a sequence of a first operation of acquiring a predetermined amount of the first write data from the host and then transmitting to the non-volatile memory, and a second operation of acquiring the predetermined amount of the second write data from the host and then transmitting to the non-volatile memory. The second operation in the sequence is started after completion of the first operation in the sequence.