Power saving in case of CPU hotplugin

On Wed, Sep 07, 2016 at 02:31:46PM +0530, Debdipta Ghosh wrote:

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?

It all depends on your hardware.  Some platforms can turn the CPUs off,
some can not.

Sorry, not much help, I know, but the variety of hardware out there in
the world is amazing...

greg k-h