Interrupt Dispatching in Multi-Processor Systems
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Solution Overview
Problem
In multi-processor systems, the unpredictable arrival of interrupts disrupts processor workflow, and existing methods for dispatching interrupts do not effectively balance power consumption and performance, leading to suboptimal response times and energy efficiency.
Innovation Solution
An interrupt controller that receives and weighs power and performance status factors of multiple processors to select the most suitable processor for handling interrupts based on specific usage scenarios, dispatching interrupts accordingly to optimize response time and energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single processor is designated as interrupt-handling processor, then interrupt handling is simplified, but system performance and responsiveness deteriorate
Solution Approach 1:
The system segments interrupt handling by dividing processors into clusters, with each cluster capable of handling interrupts independently. This allows multiple clusters to service interrupts simultaneously, improving system responsiveness while maintaining manageable complexity through modular organization.
Solution Approach 2:
The interrupt handling architecture is made dynamic by allowing any processor within a cluster to handle interrupts based on current system state and workload. The system can adaptively select which processor handles which interrupt, optimizing performance while maintaining flexibility.
2Productivity
If multiple processors service interrupts, then system performance improves, but interrupt dispatch complexity increases
Solution Approach 1:
Each processor cluster is given local autonomy to handle interrupts independently. The interrupt dispatch complexity is localized to each cluster rather than being centralized, allowing parallel processing while maintaining manageable complexity at each node.
Solution Approach 2:
The system pre-configures processor clusters and establishes interrupt routing rules beforehand. When interrupts arrive, the dispatching decision is made quickly based on pre-established criteria rather than requiring complex real-time analysis, reducing dispatch complexity.
3Productivity
If round-robin scheme is used for interrupt distribution, then load balancing is achieved, but response time increases due to processor wake-up overhead
Solution Approach 1:
The system incorporates feedback mechanisms that monitor processor states, workload, and power consumption. This feedback enables intelligent selection of which processor should handle which interrupt, achieving load balancing without requiring processors to wake from low-power states unnecessarily.
Solution Approach 2:
The system dynamically changes operational parameters such as processor power states and interrupt routing based on system conditions. By adjusting these parameters adaptively, the system achieves load balancing while minimizing wake-up overhead and response time.
4Reliability
If processor wakes from low-power state to handle interrupt, then interrupt can be serviced, but power consumption increases
Solution Approach 1:
The system pre-positions interrupts to processors that are already awake or in appropriate power states. By anticipating interrupt arrival patterns and processor availability, the system routes interrupts to ready processors, avoiding unnecessary wake-ups and reducing power consumption.
Solution Approach 2:
The interrupt controller autonomously selects appropriate processors based on their current state, enabling processors to remain in low-power states longer. The system self-manages the balance between interrupt service capability and power consumption without requiring processors to frequently wake from low-power states.
Data Source
AI summary
A multi-processor system handles interrupts using a power and performance status of each processor and a usage scenario of each processor. The power and performance status is indicated by factors that affect power consumption and processor performance. The system identifies one of the processors for handling an interrupt based on a weighted combination of the factors. Each factor is weighted based on a usage scenario for which the interrupt was generated. The system then dispatches the interrupt to the identified one of the processors.