Memory Error Handler for Uncorrectable Data Recovery
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Solution Overview
Problem
Existing memory systems face challenges in efficiently correcting data errors caused by interference, where stronger error correction techniques increase power usage and reduce performance, and current error detection and correction methods are inadequate for handling uncorrectable errors.
Innovation Solution
Implementing a less robust error correction technique in conjunction with an application-specific error handler that uses ECC codes to detect and correct errors, and invokes a separate handler to recover data to a consistent state using transaction logs and persistent storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stronger error correction techniques are used, then data error correction capability is improved, but power consumption increases and performance decreases
Solution Approach 1:
The system dynamically adjusts error correction strength based on error detectability. When errors are detectable within ECC capabilities, strong correction is applied. When uncorrectable errors are detected, the system transitions to a different handling mode (invoking error handlers) rather than attempting exhaustive correction, thus avoiding unnecessary power consumption.
Solution Approach 2:
The error handling process is segmented into multiple stages: first attempting ECC correction for correctable errors, then invoking specific error handlers for uncorrectable errors. This segmentation allows the system to apply strong error correction only when necessary and useful, rather than always using the strongest correction technique, thereby reducing overall power consumption.
2Reliability
If stronger error correction techniques are used, then data error correction capability is improved, but system performance decreases
Solution Approach 1:
The system dynamically adapts its error handling approach based on the nature of detected errors. For correctable errors, it applies ECC correction efficiently. For uncorrectable errors, it invokes targeted error handlers that recover data from persistent storage, avoiding the performance penalty of attempting exhaustive correction on all errors.
Solution Approach 2:
Error handling is segmented into correctable error path (ECC correction) and uncorrectable error path (error handler invocation with data recovery). This segmentation enables the system to process correctable errors quickly without performance impact, while handling uncorrectable errors through a separate, optimized recovery path that minimizes user impact.
3Device complexity
If current error detection and correction methods are used, then simple error handling is achieved, but uncorrectable errors cannot be properly handled
Solution Approach 1:
Error handlers act as intermediary components between the ECC correction mechanism and the data recovery process. When ECC detects an uncorrectable error, it invokes the appropriate error handler, which then mediates the recovery process by retrieving data from persistent storage and restoring data consistency, thus bridging the gap between error detection and reliable recovery.
Solution Approach 2:
The system performs preliminary actions by maintaining persistent storage copies of data and establishing error handler routines in advance. When uncorrectable errors occur, these pre-prepared recovery mechanisms can be immediately invoked without adding complexity to the error detection logic, thereby improving reliability while maintaining handling simplicity.
Data Source
AI summary
A detector detects, using an error code, an error in data stored in a memory. The detector determines whether the error is uncorrectable using the error code. In response to determining that the error is uncorrectable, an error handler associated with an application is invoked to handle the error in the data by recovering the data to an application-wide consistent state.