Decoupled Power Gating Prediction for Processor Components
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Solution Overview
Problem
Current power management techniques in processing devices, such as power gating, consume significant system resources and can lead to unnecessary delays and resource wastage due to unreliable prediction methods and performance costs associated with transitioning between power states.
Innovation Solution
Implementing a method that selectively uses entry and exit prediction techniques based on their reliability estimates to determine when to transition between power management states, such as using entry prediction techniques when reliable and relying on timer-based methods when predictions are unreliable, to minimize resource consumption and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If power gating is implemented to reduce power consumption during idle periods, then power savings are achieved, but system resources are consumed for state saving and restoration operations
Solution Approach 1:
The system performs preliminary actions by predicting whether a component will remain idle long enough to benefit from power gating before actually transitioning to the low-power state. Entry prediction determines if power gating should be entered, and exit prediction determines if the component will be activated soon, preventing unnecessary power gating operations and their associated resource costs
2Ease of operation
If timer-based power gating is used to simplify control, then ease of operation is improved, but reliability deteriorates due to unnecessary power gating and resource wastage
Solution Approach 1:
The system incorporates feedback mechanisms through prediction models that continuously monitor component behavior patterns. Entry prediction uses feedback about idle state duration to decide whether to power gate, while exit prediction uses feedback about upcoming activation events to prevent premature power gating. This feedback-based approach improves reliability while maintaining operational simplicity
3Loss of energy
If power gating is applied to idle components, then power consumption is reduced, but performance deteriorates due to state saving and restoration delays
Solution Approach 1:
The system performs preliminary prediction of both entry into and exit from idle states. By predicting exit events in advance, the system can prepare for wake-up operations or avoid power gating entirely when activation is imminent, thereby reducing or eliminating the performance penalty associated with state restoration delays
Data Source
AI summary
Power gating logic detects a transition of a component of a processing device into an idle state. In response to detecting the transition, the entry/exit power gating logic selectively implements one or more entry prediction techniques for power gating the component based on estimates of reliability of the entry prediction techniques. The entry/exit power gating logic also selectively implements one or more exit prediction techniques for exiting the power gated state based on estimates of reliability of the exit prediction techniques.