SOM-5991 User Manual
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CPU P State Control
Figure 3.20 CPU P State Control
P State Domain
Per Logical: indicates the P-state domain for each logical proc in the system.
Per Package: all procs indicate the same domain in the same package.
P-state coordination
HW_ALL (hardware) coordination is recommended over SW_ALL and SW_ANY
(software coordination)
SINGLE_PCTL
MSR_CR_MISC_PWR_MGMT 0x1AA Bit [0] : SINGLE_PCTL_EN.
SPD
PCU_MISC_CONFIG Bit [30] : SPD.
PL2_SAFETY_NET_ENABLE
PCU_MISC_CONFIG Bit [1] : PL@_SAFETY_NET_ENABLE.
Energy efficient P-state
Enable/Disable Energy efficient P-state feature. When set to 0, will disable
access to ENERGY_PERFORMANCE_BIAS MSR and CPUID Function 6 EAX
[3] will read 0 indicating nosupport for Energy Efficient policy setting. When set
to 1 will enable access to ENERGY_PERFORMANCE_BIAS MSR.
Boot performance mode
Select the performance state that BIOS will set before OS handoff.
Turbo Mode
Turbo mode allows a CPU logical processor to execute a higher frequency
when enough power is available not exceed CPU defined limits.
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