With this builtin function it is possible to write now:
[variables]
pstate=${f:intel_recommended_pstate}
[bootloader]
cmdline_pstate=+intel_pstate=${pstate}
The builtin function will return value: disable|active based on the processor
model and pass the proper intel_pstate value to kernel command line in boot time
................................
Intel recommends to use the intel_pstate CPUFreq driver in active mode with HWP
enabled on Ice Lake and later generations processors.This feature allows dynamically
set intel_pstate based on the processor's model. Currently, users need to create a
tuned override if they want to set intel_pstate to active even for newer generation processors.
For older generation processors setting pstate to active can introduce jitters which were
historically seen around and tested with RHEL-7.4.From IceLake generation, intel has fixed these issues.
Signed-off-by: Sabbir Hasan <sahasan@redhat.com>
236af6dd5c