Memory Controller Metadata Distribution Across Cache Lines
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Solution Overview
Problem
Current information handling systems face limitations in generating metadata across multiple cache lines, which restricts the robustness and scalability of error correction and data storage, as existing metadata schemes are often calculated on a per-cache-line basis, leading to reduced error detection and correction capabilities and limited metadata features.
Innovation Solution
Implementing a memory controller that calculates metadata across multiple cache lines, allowing richer metadata features to be encoded and enabling more flexible use of metadata, while maintaining full ECC coverage by using dedicated metadata lines or reconfiguring ECC lines for metadata storage, thus enhancing error detection and correction capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If metadata is calculated on a per-cache-line basis, then the device complexity is reduced and ease of operation is improved, but the metadata features are limited and error detection capability is reduced
Solution Approach 1:
The patent segments metadata into multiple cache lines, with each cache line containing a portion of the metadata. This allows the metadata to be distributed across multiple cache lines while maintaining manageable complexity through structured organization and selective population of metadata portions.
2Productivity
If metadata is calculated on a per-cache-line basis, then the processing speed is improved, but the metadata features are limited and scalability is reduced
Solution Approach 1:
The patent extends metadata storage from a single cache line to multiple cache lines, adding a dimensional aspect to metadata organization. This enables richer metadata features and improved scalability while maintaining processing efficiency through parallel handling of multiple cache lines.
3Adaptability or versatility
If dedicated metadata lines are used, then metadata functionality is improved, but the device complexity increases
Solution Approach 1:
The patent enables existing ECC memory structures to serve dual purposes: traditional error correction functionality and metadata storage. By selectively populating metadata portions within existing cache line structures, the system achieves enhanced metadata functionality without adding dedicated metadata hardware components.
Data Source
AI summary
An information handling system utilizes data with a cache line size. A memory module is coupled to a memory controller by a memory bus, and stores and retrieves data with a memory line size. The cache line size is an integer multiple of the memory line size. The memory controller calculates error correction code data for each memory line of user data, and generates metadata related to the user data for chunks of data that are equal to an integer number (N) of cache lines, where N is greater than one.