IT Services Circle

Feb 22, 2026 · Fundamentals

Why Simple FIFO Scheduling Fails and How CFS Guarantees Fair CPU Time

The article walks through the evolution of CPU scheduling from a naïve first‑come‑first‑served queue to priority‑based schemes, explains starvation and time‑slice problems, and shows how tracking each task's actual runtime leads to the Completely Fair Scheduler (CFS) with virtual runtime accounting.