How much offline cpu cores consumes power

[DDebd]

Hello,

Linux have one well known feature named as CPU-hotplug https://www.kernel.org/doc/Documentation/cpu-hotplug.txt https://www.kernel.org/doc/Documentation/cpu-hotplug.txt

In my Intel(R) Xeon(R) CPU, from OS level I can make one cpu core offline.

Technically what happens when I offline one core?

My questions as below:

1) Is that Core turned off (Not consuming power) ?

2) If it is consuming power, is it is consuming power more than C6 state?

Thanks

[idata]

Hi Debdipta,

The document that you sent is related to how to enable and disable processors in multiple socket boards. It means server boards capable of supporting 2 or more processors (CPUs) and not processor Cores. (CPU Cores). It is possible to turn off some of the Cores from the BIOS and the power consumption would decrease a little a bit. Cache memory and other features are shared by all the Cores so the active Cores would take advantage of the free memory. Regards, Mike C