Operating system coordinated thermal management

Details Operating system coordinated thermal management Operating system coordinated thermal management

2006-05-30

2006-05-30

Cabrera, Zoila (Department: 2125)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Specific application of temperature responsive control system

C713S300000

Reexamination Certificate

active

07054720

ABSTRACT:
A processor's performance state may be adjusted based on processor temperature. On transitions to a lower performance state due to the processor getting hotter, the processor's frequency is reduced prior to reducing the processor voltage. Thus, the processor's performance, as seen by the operating system, is reduced immediately. Conversely, on transitions to a higher performance state, due to the processor cooling down, the processor's frequency is not increased until the voltage is changed to a higher level. An interrupt event may be generated anytime the processor's phase locked loop relocks at a new frequency level. Thus, when the interrupt fires, the operating system can read the processor's performance state. As a result, interrupts are not generated that would cause processor performance to lag the interrupt event.

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patent: 2 383 873 (2003-07-01), None
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