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Voltage Noise: Why It’s Bad, and What To Do About It

Power constrained designs are becoming increasingly sensitive to supply voltage noise. We propose hardware-software collaboration to enable aggressive voltage margins: a fail-safe hardware mechanism tolerates margin violations in order to train a run-time software layer that reschedules instructions to avoid recurring violations. Additionally, the software controls an emergency signature-based predictor that throttles to suppress emergencies that code rescheduling cannot eliminate.