Scheduling Mode Optimization

Purpose

Adjust the OS scheduling policy to improve the CPU usage and overall server performance.

Procedure

1. Modify the kernel startup parameters.
   1. Open the file.

      1	sudo vi /etc/default/grub

   2. Press i to enter the insert mode and add the following content:

      sched_steal_node_limit=4 kpti=off mitigation=off

      The following figure shows the modification result:

      

   3. Press Esc to exit the insert mode. Type :wq! and press Enter to save the file and exit.
   4. Make the modification take effect.

      1	sudo grub2-mkconfig -o /boot/efi/EFI/openEuler/grub.cfg

2. Reboot the server for the new GRUB configuration to take effect.

   1

   reboot

3. Enable the stealtask function.
   1. Write STEAL to the /sys/kernel/debug/sched_features file to enable the stealtask function.

      1	echo STEAL > /sys/kernel/debug/sched_features

   2. Check the /proc/cmdline file and ensure that the added startup parameters have taken effect.

      cat /proc/cmdline

      The expected result is that /proc/cmdline contains the content added in 1.b.

      

   3. Check the content of the /sys/kernel/debug/sched_features file.

      cat /sys/kernel/debug/sched_features

      The STEAL state of the file indicates that the stealtask function has been enabled.