function::set_kernel_int - Linux


function::set_kernel_int alters kernel variables without having to rebuild the kernel modules. It allows users to adjust kernel behavior dynamically, enabling quick experimentation and troubleshooting of driver issues.


function::set_kernel_int <variable> <new_value>


  • variable: The kernel variable to be modified.
  • new_value: The new value to be set for the variable.


  • Set the maximum number of open files in the system:
function::set_kernel_int fs.file-max 65536
  • Adjust the TCP congestion control algorithm:
function::set_kernel_int net.ipv4.tcp_congestion_control bbr

Common Issues

  • Ensure that the sysfs filesystem is mounted.
  • Verify that you have sufficient privileges to modify kernel variables.
  • Note that some variables may require a reboot to take effect.


function::set_kernel_int can be useful in conjunction with tools like sysctl for managing kernel parameters. It can also be incorporated into scripts for automating system configuration changes.

Related Commands

  • sysctl: Dynamically view and modify kernel parameters.
  • modprobe: Load and unload kernel modules.
  • Linux Kernel Documentation: Official documentation for Linux kernel variables.