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How to disable CUPs in a BL860c server

chuckk281
Trusted Contributor

How to disable CUPs in a BL860c server

Earl asked the question from a customer:

 

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Can I turn off a CPU core on a bl860 – somehow from EFI ?

 

 A customer wants to say have spare capacity on a blade, but does not want people to see it. Can we turn a core off ? 

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Mark answered:

 

Cpuconfig will turn a cpu (not Core) off at the efi shell.

 

However, if running HT cpuconfig can only turn that off or on for all cores.

 

Here’s the information

 

Shell> cpuconfig threads -?

Deconfigure or reconfigure cpus

 

CPUCONFIG [module [on|off]]

CPUCONFIG [threads [on|off]]

CPUCONFIG [pstates [on|off]]

 

module  : Specifies which cpu module to configure

threads : Use to display info or configure threads

pstates : Use to display info or configure Power/Performance States (P-states)

on      : Specifies to reconfigure a cpu module, cpu threads, or enable

          P-states

off     : Specifies to deconfigure a cpu module, cpu threads, or disable

          P-states

 

Note:

   1. CPU status will not change until next boot.

   2. Specifying a cpu number without a state will display

      configuration status.

 

Examples:

  * To deconfigure CPU 0

    fs0:\> cpuconfig 0 off

    Cpu will be deconfigured on the next boot.

 

  * To display configuration status of cpus

    fs0:\> cpuconfig

  PROCESSOR MODULE INFORMATION

 

             # of               L3      L4      Family/

     CPU     Logical            Cache   Cache   Model         Processor

     Module  CPUs     Speed     Size    Size    (hex.)   Rev  State

     ------  -------  --------  ------  ------  -------  ---  ------------

       0        2      1.1 GHz   4MB     32MB    1F/01    B1       Active

       1        2      1.1 GHz   4MB     32MB    1F/01    B1       Active

 

  * To display cpu thread status

    fs0:\> cpuconfig threads

 

    cpuconfig: Threads are turned off.

 

  * To enable cpu threads

    fs0:\> cpuconfig threads on

 

    cpuconfig: Threads will be on after a reset

 

  * To disable cpu threads

    fs0:\> cpuconfig threads off

 

Mark