Interrupt Batching Circuitry for Edge Network CPU Efficiency
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Solution Overview
Problem
In edge network environments, the high number of interrupts generated by network interface cards (NICs) leads to 'interrupt storms,' which monopolize CPU utilization and are inefficient due to the lack of differentiation between packet data types, causing unnecessary processor cycles and resource strain.
Innovation Solution
Implementing interrupt batching and moderation circuitry that dynamically batches and routes interrupts based on priority, using watchdog timers associated with priority code points to differentiate between traffic classes, thereby throttling low-priority interrupts and prioritizing high-priority ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If interrupt batching and moderation circuitry is implemented to differentiate between packet data types, then CPU utilization efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments interrupts into different priority levels based on packet data type classification. The interrupt batching circuitry divides the interrupt handling process into multiple stages: classification of packet types, assignment of priority levels, batching of same-priority interrupts, and sequential processing. This segmentation allows the system to handle different types of network traffic differently, improving CPU utilization efficiency by preventing low-priority interrupts from monopolizing processor resources while managing complexity through structured organization of the interrupt handling pipeline.
2Loss of energy
If watchdog timers are used to throttle low-priority interrupts, then resource strain is reduced, but loss of time occurs in processing high-priority data streams
Solution Approach 1:
The patent implements dynamic interrupt prioritization where the system adapts its interrupt handling behavior based on real-time conditions. The watchdog timers are configured with different timeout values for different priority levels, allowing the system to dynamically adjust the throttling intensity. High-priority interrupts can preempt or bypass the throttling mechanism when necessary, while low-priority interrupts are subject to stricter timing control. This dynamic approach reduces processor cycle waste by throttling non-critical interrupts while maintaining responsiveness to critical events.
3Device complexity
If interrupts are processed without differentiation, then device complexity is minimized, but CPU utilization is monopolized by interrupt storms
Solution Approach 1:
The patent introduces an intermediary interrupt batching circuitry layer between the network interface card and the CPU. This intermediary component receives interrupts from the NIC, classifies them by packet data type, assigns priority levels, and batches them before forwarding to the CPU. The intermediary absorbs the complexity of interrupt differentiation and prioritization logic, keeping the CPU-side handling relatively simple while preventing interrupt storms from monopolizing processor resources. The batching circuitry acts as a buffer and filter, managing the flow of interrupts to protect the CPU from overload.
Data Source
AI summary
Methods, apparatus, systems, and articles of manufacture are disclosed to manage processor interrupts. An example apparatus includes at least one memory; instructions; and processor circuitry. The processor circuitry is to execute the instructions to receive an interrupt for a direct memory access to transfer a packet. The processor circuitry is to execute the instructions to decode a priority field in the packet to associate the interrupt with a traffic class. The processor circuitry is to execute the instructions to route the interrupt to an interrupt timer based on the traffic class, the interrupt timer to mask interrupts transmitted to the interrupt timer for a threshold period after receiving the interrupt. The processor circuitry is to execute the instructions to send the interrupt after the threshold period.