Patent ID: 8719607
Filing Date: 2014-05-06
Classification: G06F,Y02D

Abstract:
1. A method, in a data processing system, for power management of processors using Pstates, the method comprising: in a chiplet of a processor in the data processing system, receiving a request to change a Pstate from a current Pstate to a requested Pstate; determining whether the requested Pstate is less than or equal to a maximum Pstate; responsive to the requested Pstate being less than or equal to the maximum Pstate, computing a frequency associated with the requested Pstate thereby forming a computed frequency, wherein the computed frequency is computed using the following equation: where N is the requested Pstate, Fop_min is a configurable minimum operating frequency of an associated core in the chiplet of the processor, Fop_max is a configurable maximum operating frequency of the associated core in the processor, and stepfactor is a ratio of predetermined available Pstates, for example, the stepfactor would be 1/32 if the are 32 available Pstates; and adjusting an operating frequency of the chiplet to the computed frequency without involvement from a central power control entity.