Electrical computers and digital processing systems: support – Computer power control – Power conservation
Reexamination Certificate
2007-08-14
2010-11-23
Du, Thuan N (Department: 2116)
Electrical computers and digital processing systems: support
Computer power control
Power conservation
C713S600000, C718S102000, C714S001000
Reexamination Certificate
active
07840825
ABSTRACT:
A method for autonomous dynamic voltage (v) and frequency (f) scaling (DVFS) of a microprocessor, wherein autonomous detection of phases of high microprocessor workload and prediction of their duration is performed (PID). The microprocessor frequency (f) will be temporarily increased (LUT) to an appropriate safe value (even beyond its nominal frequency) consistent with technological and ambient constraints in order to improve performance when the computer system comprising the microprocessor benefits most, while during phases of low microprocessor workload its frequency (f) and voltage (v) will be decreased to save energy. This technique exploits hidden performance capabilities and improves the total performance of a computer system without compromising operational stability. No additional hardware such as service processors is needed for contemporary computer systems supporting performance counters and DFVS already. The invention allows significantly increasing the total computer system performance with only minimal impact on power (PMAX, PACTUAL) consumption.
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Altevogt Peter
Boettiger Hans
Felter Wesley M.
Lefurgy Charles R.
Stiege Lutz
Dillon & Yudell LLP
Du Thuan N
International Business Machines - Corporation
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