Interrupt Steering Register for Multi-Core Server Error Handling
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Solution Overview
Problem
In multi-node server systems, existing error handling mechanisms often lead to bottlenecks due to the reliance on a lower-speed Service Processor for error handling and interrupt management, which can impact system performance and reliability.
Innovation Solution
The implementation of a multi-node computing system with an I/O hub that includes a status register for error status messages and an interrupt steering register, allowing for programmable destination selection of interrupt signals based on error types, enabling flexible and distributed error handling among multiple processors and threads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Service Processor is dedicated for error handling and interrupt management, then error handling capability is improved, but system performance deteriorates due to bottleneck caused by lower-speed processor
Solution Approach 1:
The patent segments error handling by creating separate error handling paths for different error types. Critical errors are routed to the Service Processor while non-critical errors are handled by the I/O hub or processing nodes, dividing the error handling workload to prevent bottlenecks while maintaining comprehensive error management capability
Solution Approach 2:
The I/O hub acts as an intermediary component that receives errors from I/O components and can handle them locally or forward to the Service Processor. This intermediary layer filters and pre-processes errors, reducing the burden on the lower-speed Service Processor while maintaining system reliability
2Ease of operation
If interrupts are handled by a specific dedicated node/core/thread, then error handling is simplified, but system performance deteriorates due to bottleneck
Solution Approach 1:
The patent segments interrupt handling by implementing an interrupt steering mechanism that routes different interrupt types to different destinations (Service Processor, I/O hub, or specific processing nodes). This segmentation allows distributed handling of interrupts across multiple cores/threads while maintaining organized error handling through the interrupt steering register
Solution Approach 2:
The interrupt steering register provides dynamic routing capability, allowing the system to adaptively direct interrupts to appropriate handlers based on error type and system state. This dynamic approach enables flexible distribution of interrupt handling workload across multiple processing nodes and cores
3Productivity
If multiple Guest Operating Systems share hardware and processing power, then cost is minimized, but error handling complexity increases due to plentiful errors requiring quick and careful handling
Solution Approach 1:
The patent segments error handling by virtualization-aware routing that can direct errors to appropriate GOS or service processors. The interrupt steering mechanism can route interrupts to specific GOS instances or to a dedicated service processor, isolating error handling to prevent error propagation while maintaining efficient resource sharing among multiple GOS
Solution Approach 2:
The I/O hub and interrupt steering mechanism serve as intermediaries between I/O components and multiple Guest Operating Systems. This intermediary layer manages error routing, filtering, and distribution, simplifying error handling complexity while enabling efficient resource sharing among multiple GOS by providing a centralized error management point
Data Source
AI summary
Implementations of the present disclosure involve a system and/or method for handling errors in a multi-node commercial computing system running a number of guest applications simultaneously. In particular, the system and/or method provides the ability to program on a per-error basis the destination within the system for an interrupt based on an I/O error, the ability to provision for multiple/redundant error reporting paths for a class of more severe errors and/or distributed set of error status and log registers to aid software in narrowing down the source of an error that triggered the interrupt. In addition, the system provides for dynamically altering the destination of the error handling in response to one or more operating conditions of the system. Such flexibility in the system provides for a more robust error handling without impacting the performance of the multi-node computing system.