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Runtime Power Efficiency Measuring to Control CPU Frequency

IP.com Disclosure Number: IPCOM000236804D
Publication Date: 2014-May-16
Document File: 1 page(s) / 28K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a technology related to runtime power efficiency measuring to control CPU frequency.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

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Runtime Power Efficiency Measuring to Control CPU Frequency


For most ACPI-compliant systems, P-state is designed to get better power efficiency.

CPU will change frequency/voltage according to the CPU loading.

However, in the middle range of CPU loading, it's hard to determine which CPU frequency could get optimum power efficiency.

Propose a method to run-time calculate "power efficiency" and use it to determine the CPU frequency.

Run-time Power Efficiency Measuring:


Using IPMI command to read AC power from IMM Power Efficiency = (CPU Loading)/(AC Power)

CPU Frequency Changing Rule:


Only change CPU frequency while Power Efficiency decreased Increase CPU frequency if CPU Loading increased
Decrease CPU frequency if CPU Loading decreased

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