DMA Controller Metadata Check for Memory Buffer Performance
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Solution Overview
Problem
Current memory controllers face performance limitations in handling multiple data requests efficiently, particularly due to the need for simultaneous validation of user data metadata, which can lead to increased processing times and reduced performance as the host's operating speed and bandwidth increase.
Innovation Solution
The memory controller incorporates a DMA controller that checks metadata for user data corresponding to multiple logical block addresses, allowing for simultaneous or sequential validation and transfer of user data via a PCIe interface, utilizing a buffer memory structure that separates user data and metadata across different volatile memory types like DRAM and SRAM to optimize data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the memory controller checks metadata for each data transfer sequentially, then data transfer accuracy is ensured, but processing time increases and performance decreases
Solution Approach 1:
The patent applies preliminary action by checking metadata for multiple logical block addresses in advance before actual data transfer occurs. The DMA controller checks metadata status for second LBA before user data for first LBA is transferred, so that when data transfer is needed, the validation is already complete, eliminating rechecking delays and improving processing speed while maintaining data accuracy
Solution Approach 2:
The patent implements continuity of useful action by performing metadata checking operations continuously and in parallel across multiple logical block addresses. The DMA controller checks metadata for multiple LBAs simultaneously or in overlapping time periods, ensuring that the validation process continues without interruption and does not become a bottleneck for data transfer operations
2Productivity
If the memory controller validates metadata simultaneously for multiple data requests, then processing efficiency improves, but system complexity increases
Solution Approach 1:
The patent introduces an intermediary approach by using a dedicated DMA controller component that handles metadata checking operations separately from the main data transfer logic. This intermediary DMA controller manages the complexity of simultaneous metadata validation for multiple LBAs, while presenting a simplified interface to the rest of the memory controller system, thus improving processing efficiency without proportionally increasing overall system complexity
3Quantity of substance
If user data and metadata are stored in the same memory location, then memory utilization is maximized, but data validation time increases
Solution Approach 1:
The patent applies segmentation by separating user data and metadata into distinct storage locations within the buffer memory. User data for first LBA is stored separately from metadata for second LBA, allowing the DMA controller to access and validate metadata without interfering with or waiting for user data operations. This segmentation enables parallel access patterns that reduce validation time while still achieving high memory utilization through efficient buffer management
Data Source
AI summary
A memory controller is provided which includes a host interface configured to provide an interface for communication with a host; a buffer memory configured to store user data and metadata of the user data; and a DMA controller configured to access the buffer memory to check the metadata and to provide user data corresponding to a logical block address requested from a host to the host interface according to the checking result. The metadata includes status information of the user data stored at the buffer memory. Before providing the host interface with user data corresponding to a first logical block address requested from the host, the DMA controller checks metadata of user data corresponding to a second logical block address requested from the host.