1 Reply Latest reply on Sep 13, 2016 7:10 PM by Intel Corporation

    How much offline cpu cores consumes power



      Linux have one well known feature named as CPU-hotplug 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?




        • 1. Re: How much offline cpu cores consumes power
          Intel Corporation
          This message was posted on behalf of Intel Corporation

          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.
          Mike C