Performance and Energy Bias Hint Support in UEK2 for Intel® 64 and IA-32 Architectures
(Doc ID 1609971.1)
Last updated on FEBRUARY 19, 2019
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]
Oracle Cloud Infrastructure - Version N/A and later
Information in this document applies to any platform.
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:
|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:
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