Linux Randomly Picking Idle CPU Cores Shows Modest Win On High Core Count Systems
Linux Randomly Picking Idle CPU Cores Shows Modest Win On High Core Count Systems Written by Michael Larabel in Linux Kernel on 16 September 2026 at 09:30 AM EDT. Add A Comment Arm engineer Christian Loehle sent out a patch series today proposing that the Linux scheduler code randomize its picking of equally shallow idle CPU cores. This randomization is showing to deliver a win at least for high CPU core counts for better distributing workloads.
- ▪Linux Randomly Picking Idle CPU Cores Shows Modest Win On High Core Count Systems Written by Michael Larabel in Linux Kernel on 16 September 2026 at 09:30 AM EDT.
- ▪Add A Comment Arm engineer Christian Loehle sent out a patch series today proposing that the Linux scheduler code randomize its picking of equally shallow idle CPU cores.
- ▪This randomization is showing to deliver a win at least for high CPU core counts for better distributing workloads.
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| Original publisher | Phoronix |
| Canonical URL | https://www.phoronix.com/news/Linux-Random-Equal-Idle-CPUs |
| Publication time | Wed, 16 Sep 2026 09:30:04 -0400 |
| Retrieval time | 2026-09-16T13:38:41.585Z |
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Linux Randomly Picking Idle CPU Cores Shows Modest Win On High Core Count Systems Written by Michael Larabel in Linux Kernel on 16 September 2026 at 09:30 AM EDT. Add A Comment Arm engineer Christian Loehle sent out a patch series today proposing that the Linux scheduler code randomize its picking of equally shallow idle CPU cores. This randomization is showing to deliver a win at least for high CPU core counts for better distributing workloads. Loehle found that the Linux kernel scheduler's behavior with concurrent slow-path selectors can converge on the same idle CPU cores before either task is enqueued. To avoid that pitfall of potentially converging tasks on the same idle CPU core(s), his proposed approach is to randomize the equally shallow idle CPU cores.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Phoronix.