* Power saving in case of CPU hotplugin
@ 2016-09-07 9:01 Debdipta Ghosh
2016-09-07 11:13 ` Greg KH
0 siblings, 1 reply; 2+ messages in thread
From: Debdipta Ghosh @ 2016-09-07 9:01 UTC (permalink / raw)
To: kernelnewbies
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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* Power saving in case of CPU hotplugin
2016-09-07 9:01 Power saving in case of CPU hotplugin Debdipta Ghosh
@ 2016-09-07 11:13 ` Greg KH
0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2016-09-07 11:13 UTC (permalink / raw)
To: kernelnewbies
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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