scheduling

Schedulers, and why the default is usually right

10 February 2026 · linux kernel performance scheduling

CFS gave way to EEVDF over 6.6 to 6.12. Most people who tune a scheduler are solving a problem that isn't a scheduling problem, and the cases where it really is are narrower than the tuning guides let on.

Heterogeneous is the default now

18 April 2024 · hardware scheduling arm performance

Performance and efficiency cores, unified memory, accelerators on-package. The uniform-core model that every piece of scheduling and benchmarking folklore assumes has stopped being true, and the machine that replaces it does more per watt than anything symmetric ever will.