Cookie Consent by Free Privacy Policy Generator ๐Ÿ“Œ The Linux kernel scheduler has been accidentally hardcoded to a maximum of 8 cores for the past 15 years and nobody noticed

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๐Ÿ“š The Linux kernel scheduler has been accidentally hardcoded to a maximum of 8 cores for the past 15 years and nobody noticed


๐Ÿ’ก Newskategorie: Linux Tipps
๐Ÿ”— Quelle: reddit.com

TL;DR This doesnโ€™t mean that the scheduler canโ€™t use more than 8 cores. The scheduler controls how to allocate tasks to available cores. How to schedule particular workloads efficiently on available hardware is a complex problem. There are settings and hardcoded timings to control the behavior of the scheduler, some vary with the number of cores, some donโ€™t, unfortunately they donโ€™t work as intended because they were capped to 8 cores. This had a rationale around 2005-2010 when the latest CPUs were the core 2 duo and core 2 quad on interactive desktops and โ€œnobody will ever get more than 8 coresโ€, this doesnโ€™t hold as well in 2023 when the baseline is 128 cores per CPU on non-interactive servers.

TL;DR; Yes, this has performance implications especially if you run compute clusters, no, your computer wonโ€™t get 20 times faster. Sorry. Either way, comments in the kernel, man pages and sysctl documentation are wrong and should be corrected, they genuinely missed for the last 15 years that there was a scaling factor at play capped to 8 cores.

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https://thehftguy.com/2023/11/14/the-linux-kernel-has-been-accidentally-hardcoded-to-a-maximum-of-8-cores-for-nearly-20-years/

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