LBA Table Read Commands for Non-Contiguous Sequential Access
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Solution Overview
Problem
Memory systems face reduced pre-reading performance and increased latency when accessing sequential data with non-contiguous logical address ranges, as existing prediction algorithms assume contiguous LBAs, leading to inefficiencies.
Innovation Solution
Incorporating an LBA table in an extra header segment of a read command to indicate non-contiguous logical address ranges, enabling improved pre-reading performance by optimizing the prediction algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If prediction algorithms assume contiguous LBAs for sequential data, then the algorithm complexity is reduced, but the accuracy of pre-reading predictions deteriorates when non-contiguous LBAs are used
Solution Approach 1:
The patent segments the LBA address space into contiguous ranges and uses an LBA table to represent non-contiguous segments. This allows the prediction algorithm to handle complex non-contiguous patterns by breaking them down into manageable segments, improving accuracy without requiring the algorithm to process every individual LBA separately.
Solution Approach 2:
The LBA table acts as an intermediary data structure between the read command and the prediction algorithm. It translates the non-contiguous LBA references into a standardized format that the prediction algorithm can process efficiently, mediating between the complexity of non-contiguous addresses and the simplicity of the prediction mechanism.
2Device complexity
If the memory system uses standard read commands without additional headers, then the command structure remains simple, but the ability to indicate non-contiguous LBA ranges is lost
Solution Approach 1:
The LBA table is prepared in advance as part of the read command structure, allowing the memory system to pre-identify and mark non-contiguous LBA ranges before the actual data read operation begins. This preliminary organization of address information enables efficient handling of non-contiguous accesses without complicating the overall command execution flow.
3Adaptability or versatility
If sequential data is stored with non-contiguous logical addresses, then data flexibility and adaptability improve, but pre-reading performance and access speed deteriorate
Solution Approach 1:
The patent introduces dynamic elements to the command structure through the LBA table, which can adapt to different LBA patterns. The table dynamically organizes non-contiguous LBA ranges into contiguous-like structures for the prediction algorithm, allowing the system to maintain high read speeds while supporting flexible non-contiguous data storage patterns.
Data Source
AI summary
Methods, systems, and devices for logical address indications for accessing sequential data from a memory system are described. The described techniques provide for a memory system to access sequential data associated with non-contiguous logical address ranges based on receiving a read command including information indicating the non-contiguous logical address ranges. For example, the read command may indicate the non-contiguous logical address ranges in an extra header segment (EHS) data field and the memory system may use the indication of the non-contiguous logical address ranges to improve access performance, such as by informing a pre-reading algorithm. In some examples, the memory system may identify that the EHS data field includes a logical address table based on one or more second fields of the read command, such as an EHS length field, an EHS type field, and an EHS sub-type field.