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02-09-2010 10:49 AM
02-09-2010 10:49 AM
How to disable CUPs in a BL860c server
Earl asked the question from a customer:
**********************************************************************************
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 ?
*********************************************************************************************
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