Niels Robin-Aubertin nrobinaubertin

## C-states.md

      
        
          
            
              
              1 file
            
          
          
            
              
              25 forks
            
          
          
            
              
              19 comments
            
          
          
            
              
              116 stars
            
          
        
        
          
              
          
          
            
                wmealing
                / C-states.md
            
            
              Last active
              March 29, 2024 22:51
            
              
                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: