SSD Controller Page Straddling Buffer Optimization
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Solution Overview
Problem
In SSDs, the excessive use of buffer memory for data processing leads to bandwidth bottlenecks due to the need for temporary storage and processing of divided data during page straddling, which occurs when compressed data spans multiple physical pages, necessitating inefficient data collection and extension processes.
Innovation Solution
A storage device with a medium controller that determines if data is stored across multiple pages, allowing for efficient reading and processing of data by storing and restoring only the necessary portions in the buffer memory, thereby reducing data input/output operations and optimizing bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data compression is applied to increase capacity and reduce bit cost, then storage capacity increases and bit cost decreases, but page straddling occurs causing data to be divided across multiple physical pages requiring complex buffer management
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the mapping relationship between logical pages and physical pages before data access operations. The mapping information includes flags indicating whether each logical page is divided across multiple physical pages, allowing the system to anticipate and prepare for page straddling scenarios without complex runtime buffer management decisions
Solution Approach 2:
The patent introduces mapping information as an intermediary layer between the logical page structure and physical page storage. This mapping table serves as a mediator that translates logical page addresses to physical page addresses and provides division status, eliminating the need for complex buffer management by providing straightforward lookup information
2Reliability
If page straddling handling is implemented to manage data divided across multiple physical pages, then data integrity is maintained, but buffer memory bandwidth is excessively consumed causing performance degradation
Solution Approach 1:
The patent uses preliminary action by pre-storing mapping information that indicates whether each logical page is divided across multiple physical pages. This allows the system to determine in advance whether buffer memory operations are needed, avoiding unnecessary data collection and extension operations that consume buffer bandwidth, while still maintaining data integrity when division occurs
Solution Approach 2:
The patent applies partial action by only performing buffer memory operations (data collection and extension) when the mapping information indicates that page straddling actually occurs. For logical pages that are not divided, the system directly accesses physical pages without buffer involvement, thus avoiding excessive buffer memory bandwidth consumption while maintaining data integrity for divided pages
3Adaptability or versatility
If mapping information is stored to track logical-physical page relationships, then page straddling can be detected and handled, but additional memory resources are required
Solution Approach 1:
The patent applies local quality by storing mapping information in a compact format that only includes necessary details for each logical page: the corresponding physical page address and a simple division flag. This localized, minimal-information approach provides adequate page straddling detection capability without requiring extensive memory resources for comprehensive tracking data
Data Source
AI summary
A storage device determines whether or not reading target data subjected to a first conversion process is divided and stored into multiple pages. When the data subjected to the first conversion process is stored in one of a plurality of pages, the data is read from the page, and a second conversion process for returning the data to a state before the data is subjected to the first conversion process is executed to the data. When the reading target data is divided and stored into two or more of the plurality of pages, a portion of the data is read from each of the two or more pages in which the portion of the data is stored, the portion of the data is stored in the buffer memory, the data subjected to the first conversion process is restored, and the second conversion process is executed to the restored data.