Proactive Voltage Droop Mitigation in Processor Cores
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Solution Overview
Problem
Processor cores experience voltage droop due to large temporal gradients in load current, leading to inefficiencies and performance issues, as existing reactive mitigation methods are delayed and may over-throttle, resulting in suboptimal performance and power consumption.
Innovation Solution
A proactive voltage droop mitigation system that detects events in the processor pipeline's early stages, predicts future power changes, and applies throttling countermeasures before power consumption increases, using an observation component, instruction component, and feedback component to adjust and optimize voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reactive mitigation methods are used to address voltage droop, then voltage droop can be mitigated after detection, but the mitigation is delayed and may over-throttle resulting in suboptimal performance
Solution Approach 1:
The patent applies preliminary action by detecting events in the first stage of the processor pipeline that indicate future power consumption increases, and proactively applying throttling countermeasures before the actual voltage droop occurs. This allows the system to prevent voltage droop rather than react to it, eliminating the delay inherent in reactive methods while avoiding over-throttling by timing the intervention precisely when needed.
Solution Approach 2:
The patent implements feedback through the feedback component that monitors the results of applied throttling countermeasures and provides notifications about their success or failure. This closed-loop feedback mechanism allows the system to adjust future mitigation actions based on actual outcomes, optimizing both voltage droop mitigation effectiveness and processor performance by learning from past interventions.
2Reliability
If reactive mitigation methods are used, then voltage droop can be addressed, but the response is delayed causing suboptimal power consumption
Solution Approach 1:
By detecting pipeline events early and applying throttling countermeasures before power consumption increases, the system prevents voltage droop without the need for excessive reactive throttling. This preliminary intervention reduces energy loss by avoiding the wasteful over-throttling that occurs when reactive methods wait too long to respond to voltage droop conditions.
3Reliability
If proactive throttling is applied earlier, then voltage droop is reduced, but it requires detecting events in early pipeline stages
Solution Approach 1:
The observation component leverages the processor's existing pipeline structure and event detection capabilities to identify events that correlate with future power consumption increases. By using the pipeline's inherent event signaling mechanisms, the system achieves proactive voltage droop reduction without adding substantial external complexity, as the processor already generates the necessary event information during normal operation.
Data Source
AI summary
Techniques facilitating voltage droop reduction and/or mitigation in a processor core are provided. In one example, a system can comprise a memory that stores, and a processor that executes, computer executable components. The computer executable components can comprise an observation component that detects one or more events at a first stage of a processor pipeline. An event of the one or more events can be a defined event determined to increase a level of power consumed during a second stage of the processor pipeline. The computer executable components can also comprise an instruction component that applies a voltage droop mitigation countermeasure prior to the increase of the level of power consumed during the second stage of the processor pipeline and a feedback component that provides a notification to the instruction component that indicates a success or a failure of a result of the voltage droop mitigation countermeasure.