Memory Write Scheduling for Non-Consecutive LBA Sequences
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Solution Overview
Problem
Performing memory management operations prior to write commands in memory systems results in increased latency and power consumption, especially when dealing with non-consecutive write commands or small data sizes, leading to inefficiencies.
Innovation Solution
Delaying memory management operations such as garbage collection until after a sequence of non-consecutive write commands is completed, and allocating additional cache space during this delay to perform the commands efficiently, thereby reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If memory management operations are performed prior to write commands, then memory reliability is improved, but latency increases
Solution Approach 1:
The patent applies preliminary action by performing memory management operations (such as garbage collection) before the write commands are executed. This ensures that memory resources are prepared and available when write operations need to occur, improving reliability while managing latency through advance preparation.
Solution Approach 2:
The patent dynamically adjusts the timing and prioritization of memory management operations based on system conditions, command sequences, and resource availability. This dynamic approach allows the system to balance between performing management operations early for reliability and delaying them when write performance is prioritized.
2Reliability
If memory management operations are performed prior to write commands, then memory reliability is improved, but power consumption increases
Solution Approach 1:
Memory management operations are performed in advance when system conditions favor such operations (e.g., during idle periods or when power availability is high), preparing memory resources without immediately incurring power costs during active write operations.
Solution Approach 2:
The patent implements periodic or conditional execution of memory management operations based on system state, command sequences, and power conditions. This allows the system to perform management tasks at optimal intervals rather than continuously, reducing overall power consumption while maintaining reliability.
3Productivity
If additional cache space is allocated during command execution, then write performance is improved, but device complexity increases
Solution Approach 1:
The patent segments cache memory into different regions or pools that can be dynamically allocated to handle write commands. This segmentation allows flexible resource distribution without requiring a complete redesign of the cache structure, managing complexity while improving performance.
Solution Approach 2:
The patent dynamically allocates additional cache space based on the specific needs of command sequences, particularly for non-consecutive write commands. This dynamic allocation is triggered only when beneficial, avoiding the complexity of permanently provisioned additional cache while improving write performance when needed.
Data Source
AI summary
Methods, systems, and devices for memory write performance techniques are described. A memory system may receive a sequence of commands, for example from a host system. Based on a relationship between logical block addresses of the sequence of commands, the memory system may delay performing a memory management operation (e.g., a garbage collection procedure, a power operation, a cache synchronization operation, a data relocation operation, or the like) for a duration. For example, the memory system may determine whether a quantity of write commands in the sequence that include non-consecutive logical block addresses exceeds a threshold. In some cases, the memory system may perform one or more commands in the sequence during the duration. Subsequently (e.g., at the end of the duration), the memory system may perform the memory management operation.