Saving power in a computer system

Details Saving power in a computer system Saving power in a computer system

2011-06-21

2011-06-21

Du, Thuan N (Department: 2116)

Electrical computers and digital processing systems: support

Computer power control

Power conservation

C713S322000, C713S324000

Reexamination Certificate

active

07966506

ABSTRACT:
A power management unit (PMU) may promote a processing core from a working state to a first non-working power saving state after receiving a signal from an automatic core C-state promotion (ACCP) unit. An OS component may detect the idling of the processing core and may initiate the ACCP. The ACCP may initiate the PMU to promote the processing core to a first non-working power saving state. The ACCP may track the residency time of the processing core in the first non-working power saving state and may initiate the PMU to promote the processing core to a next non-working power saving state if residency time of the processing core in the first non-working power saving state exceeds a first value. The ACCP may initiate the PMU to demote the processing core back to the working state if a break event occurs during the residency time.

REFERENCES:
patent: 6000035 (1999-12-01), Matsushima et al.
patent: 6193422 (2001-02-01), Belt et al.
patent: 6308279 (2001-10-01), Toll et al.
patent: 6988214 (2006-01-01), Verdun

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