Power saving in case of CPU hotplugin

[Debdipta Ghosh]

HEllo all,

I was going through a linux well known concept, hot plugin of cpu cores:
https://www.kernel.org/doc/Documentation/cpu-hotplug.txt

Is it more power saving than highest C-State and P-State?

If we make one cpu offline, it disappears from the OS as it is not present,
Is that means that CPU is powered off?

Thanks,
Debdipta
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