Roman Shtylman defunctzombie

## C-states.md

      
        
          
            
              
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                defunctzombie
                / C-states.md
            
            
              Created
              July 5, 2016 18:21
                — forked from wmealing/C-states.md
            
              
                What are CPU "C-states" and how to disable them if needed?
              
          
        
      
        
  
      
    To limit a CPU to a certain C-state, you can pass the processor.max_cstate=X option in the kernel line of /boot/grub/grub.conf.
Here we limit the system to only C-State 1:
    kernel /vmlinuz-2.6.18-371.1.2.el5 ... processor.max_cstate=1

On some systems, the kernel can override the BIOS setting, and the parameter intel_idle.max_cstate=0 may be required to ensure sleep states are not entered: