Power saving in case of CPU hotplugin

Greg KH greg at kroah.com
Wed Sep 7 07:13:36 EDT 2016

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

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