Performance and Energy Bias Hint Support in UEK2 for IntelĀ® 64 and IA-32 Architectures (Doc ID 1609971.1)

Last updated on SEPTEMBER 14, 2017

Applies to:

Linux OS - Version Oracle Linux 6.4 with Unbreakable Enterprise Kernel [2.6.39] to Oracle Linux 6.4 with Unbreakable Enterprise Kernel [2.6.39] [Release OL6U4]
Linux OS - Version Oracle Linux 5.9 with Unbreakable Enterprise Kernel [2.6.39] to Oracle Linux 5.9 with Unbreakable Enterprise Kernel [2.6.39] [Release OL5U9]
Information in this document applies to any platform.

Goal

Sandy Bridge and later Intel platforms have an MSR (model-specific register) hint with at least three hints to control the trade-off between energy consumption and performance:

 
FunctionDescription
Performance Higher performance for certain workloads at the cost of higher energy consumption for most workloads.
Normal Lower performance for certain workloads; less overall energy consumption.
Powersave Lower performance for more workloads; best overall energy consumption.

 


The Performance and Energy Bias Hint can be set through some BIOS firmware versions.

The Performance and Energy Bias Hint can also be set through the user space program x86_energy_perf_policy(8) in the kernel-tools RPM package.

On Oracle Linux 5.9 with UEK2:

  

Solution

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