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In my understanding, they are both adjusting voltage and freq for power efficiency.
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They're synonymous. See here for more information: https://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interface.
...S
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https://wiki.archlinux.org/index.php/CPU_frequency_scaling
intel_pstate This driver implements a scaling driver with an internal governor for Intel Core (Sandy Bridge and newer) processors.
acpi-cpufreq CPUFreq driver which utilizes the ACPI Processor Performance States. This driver also supports the Intel Enhanced SpeedStep (previously supported by the deprecated speedstep-centrino module).
It looks they use different drivers.
When p-state enabled, speedstep will be disabled ?
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If both will be enabled, OS should provide target speed/freq to speedstep( CPU MSR ), and p-state will also working it's own target speed/freq, isn't it ?
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Hi Oscar,
Sorry, I am not very clear.
Do you mean these two features will work separately at the same time? ( both enabled )
or only one can be enabled at the same time ?
In my understanding, speedstep also depends on OS workload.
http://download.intel.com/design/network/papers/30117401.pdf
In my understanding, they should conflict if work at the same time together.
Thanks.
Mark Kang.
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Hi Oscar,
I got it, thank you for your feedback.
Mark Kang.
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