How to change kernel scheduler

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1

Hi

As I have recently moved my desktop PC from Bazzite to NixOS, I have also investigated which, gaming related, performance improvement can be obtained. In order to send the elevator back down I have documented my efforts on the appropriate wiki page.

However, even though I would have liked to, I have not documented how to change the scheduler, as I was not really sure if I did it right.

As far as I know, you can load a custom scheduler, defined by sched_ext, by the following:

# configuration.nix
  services.scx = {
    enable    = true;
    scheduler = "scx_lavd";
  };

But does the above also enable the new scheduler, or does it only load a new scheduler?

My insecurities arise from the first line of sched-ext/scx README.md […] “and dynamically loads them”, which makes it sound to me like you have to do something additional to enable the selected scheduler.

Many thanks in advance!

2

Yes it does work. I’ve also used its adios fs scheduler

I’m currently back on fedora workstation 44 kde and using cachyos lts kernel with lavd and adios fs scheduler.

I prefer the performance of cachyos kernel but I love the rpm pkg manager.