Multi-Core ECU Security Job Segmentation for Execution Time Reduction
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Solution Overview
Problem
In electronic control units (ECUs) based on the AUTOSAR platform, asynchronously driven security algorithms face challenges with prolonged execution times due to high-priority tasks competing for resources, especially when executing time-consuming asymmetric key-based security jobs on the same core, which can starve other tasks of resources.
Innovation Solution
A method is implemented in a multi-core ECU structure that allocates high-priority security jobs to a security dedicated core and lower-priority jobs, such as asymmetric key-based algorithms, to a second core, allowing the latter to be executed by the cryptographic software driver, thereby reducing execution time and minimizing impact on other tasks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If security jobs are executed on the same core as other tasks, then resource utilization is improved, but execution time increases due to starvation from high-priority tasks
Solution Approach 1:
The system segments security jobs into two categories: synchronous security jobs executed on the first core and asynchronous security jobs executed on the second core. This segmentation allows security functions to be distributed across multiple cores, preventing starvation while maintaining resource utilization. The hardware cryptographic driver on the first core handles synchronous jobs, while the cryptographic software driver on the second core handles asynchronous jobs.
2Reliability
If asynchronous security jobs are executed on the security dedicated core, then security function capability is improved, but execution time increases when many jobs are queued
Solution Approach 1:
The system segments asynchronous security jobs into those executed on the security dedicated core and those transferred to the second core. This segmentation prevents job queue overflow on the security dedicated core by offloading excess jobs to the second core, thereby reducing execution time while maintaining security function capability.
Solution Approach 2:
The system dynamically transfers asynchronous security jobs from the security dedicated core to the second core based on queue status and system conditions. This dynamic adjustment allows the system to adapt to varying job loads, preventing execution time delays while maintaining security functionality.
3Productivity
If time-consuming asymmetric key-based algorithms are executed on the same core, then security job completion is improved, but impact on other tasks increases
Solution Approach 1:
The system segments asymmetric key-based security jobs and executes them on the second core rather than the first core. This segmentation isolates resource-intensive operations from other tasks on the first core, reducing negative impact while maintaining security job completion through the cryptographic software driver on the second core.
Data Source
AI summary
Provided is a method performed in an electronic control unit of a multi-core structure. The method comprises executing one or more first type security jobs on a first core, selecting one or more second type security jobs assigned for execution on a security dedicated core, and designating the selected second type security jobs for execution on the second core instead of the security dedicated core.