Advanced Configuration and Power Interface Specification

Processor Configuration and Control
Highest Performance
Nominal Performance
Lowest Nonlinear Performance
Guaranteed Performance
Allowed Range
Lowest Performance
0
Figure 8-49 Platform performance thresholds
Note: Not all performance levels need be unique. A platform's nominal performance level may also be its
highest performance level, for example.
8.4.7.1.1.1 Highest performance
Register or DWORD
Register Location: PCC or Functional Fixed Hardware
Attribute:
Read
Size:
8-32 bits
Highest performance is the absolute maximum performance an individual processor may reach,
assuming ideal conditions. This performance level may not be sustainable for long durations, and
may only be achievable if other platform components are in a specific state; for example, it may
require other processors be in an idle state.
8.4.7.1.1.2 Nominal Performance
Register or DWORD
Register Location:
Attribute:
Size:
PCC or Functional Fixed Hardware
Read
8-32 bits
Nominal Performance is the maximum sustained performance level of the processor, assuming
ideal operating conditions. In absence of an external constraint (power, thermal, etc.) this is the
performance level the platform is expected to be able to maintain continuously. All processors are
expected to be able to sustain their nominal performance state simultaneously.
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