In this case, it's all about the settings. Each of our two illustrated steps simply ensures that the settings are in a location where they become permanent parts of the server. Any future reboot will automatically apply these newly selected values instead of the defaults. The sysctl command activates them immediately, so we don't need to reboot to modify system behavior.
The sched_migration_cost_ns setting is the total time the scheduler will consider a migrated process cache hot and, thus, less likely to be remigrated. By default, this is 0.5 ms (500000 ns). As the size of the process table increases, the complexity inherited by the process scheduler eventually results in high CPU overhead, merely to assign processors to ...
