SSD Controller Dynamic HMB Transfer for L2P Latency
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Solution Overview
Problem
Current storage devices face performance issues due to the fixed HMB transfer size for L2P address translation data, leading to significant latency and reduced performance for large host commands.
Innovation Solution
Implementing a dynamic HMB transfer size based on the host data length and the quantity of free and contiguous memory slots in the HMB read buffer, allowing the controller to efficiently request and store L2P address translation data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed HMB transfer size is used for L2P address translation data, then the memory allocation is simple, but the latency increases and performance decreases for large host commands
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed HMB transfer size to a dynamic transfer size that adapts based on the host command size. The controller determines the appropriate transfer size by comparing the host data length against threshold values, allowing the system to optimize performance for different command scenarios while maintaining manageable complexity through structured decision logic.
2Device complexity
If a fixed HMB transfer size is used, then the control logic is simple, but the performance for large host commands is reduced
Solution Approach 1:
The patent implements parameter changes by modifying the HMB transfer size parameter based on the host command characteristics. The controller adjusts this critical parameter dynamically by evaluating the host data length against predefined thresholds, thereby optimizing the balance between control logic complexity and performance for different operational scenarios.
3Loss of time
If the HMB transfer size is increased to reduce the number of read requests, then the latency decreases, but the memory locations required increase
Solution Approach 1:
The system dynamically adjusts the HMB transfer size based on the host command size, requesting only the necessary amount of L2P address translation data. This dynamic approach prevents excessive memory allocation while minimizing the number of read requests, thereby reducing latency without proportionally increasing memory requirements.
Solution Approach 2:
The controller changes the transfer size parameter adaptively by comparing host data length against threshold values. This parameter adjustment ensures that the HMB requests for L2P data are optimized for each specific command scenario, balancing the trade-off between reducing read request count and limiting memory location usage.
4Productivity
If dynamic HMB transfer size is implemented based on host data length, then the performance improves, but the control complexity increases
Solution Approach 1:
The patent manages control complexity by implementing parameter changes based on straightforward threshold comparisons of host data length. The controller adjusts HMB transfer size by evaluating against predefined thresholds, which provides performance optimization through a systematic and manageable decision-making process rather than complex algorithms.
Solution Approach 2:
The system applies local quality by tailoring the HMB transfer size specifically to match the requirements of individual host commands. This localized optimization ensures that each command receives the appropriate amount of L2P address translation data, improving performance for specific scenarios while maintaining overall control through rule-based differentiation.
Data Source
AI summary
Aspects of a storage device are provided that requests L2P address translation data from an HMB for execution of an associated host command using a dynamically determined HMB transfer size. The storage device includes a volatile memory and a controller. The controller allocates, in the volatile memory, multiple memory locations for L2P address translation data from an HMB. The controller receives a command indicating a host data length, and transmits a request for a portion of the L2P address translation data stored in the HMB for the command. The HMB transfer size associated with the request may be based on the host data length of the associated host command, a quantity of free and contiguous memory locations available in the HMB read buffer, or a minimum between a size of the portion and a total size of the free and contiguous memory locations. Thus, HMB transfer latency may be reduced.