Magic Mirror in My Hand…Who is the Fairest Scheduler in Linux Land?
Today I dive into the deep and mysterious waters of the new Linux Scheduler Earliest Eligible Virtual Deadline First (EEVDF), a scheduler which has supplanted the Completely Fair Scheduler (CFS) in the Linux Kernel 6.6. I ran into a couple of surprises so I am including the other mystery to this puzzle which is the Intel Thread Director which comes into play when using Intel Hybrid CPU architecture from the 12th Generation Intel processors to the present 14th Gen (MeteorLake) CPUs. So buckle up because « we ain’t in Kansas anymore ».
AI Image: In the spirit of the Evil Queen from Sleeping Beauty, who asked one single question every day…
Chapters
00:00 – Start
00:18 – Why change from CFS?
02:12 – Sounds Great so what’s the problem?
04:37 – Problem 2
05:27 – Solution
08:37 – Hybrid CPUs
09:25 – Intel Thread Director
10:47 – Intel’s CPU Classification
12:54 – Intel Thread Director
14:01 – Use Case: Idle Load Balancing
15:24 – Use Case: Partially Idel Load Balancing
16:18 – Use Case: Live Exchange
17:02 – Use Case: Overutilized and Unbalanced CPUs
18:19 – Use Case: Overloaded and Balanced CPUs
19:10 – Performance Governor Isn’t the Best
26:45 – Unix Bench
28:29 – Final Thoughts
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