Understanding Multi‑core Hardware Architecture and Linux sched_domain

The article explains how Linux builds sched_domain and sched_group hierarchies based on physical CPU topology—sockets, dies, clusters, and NUMA nodes—illustrating load‑balancing (BALANCE) versus affinity (AFFINE) with concrete examples, kernel code references, and QEMU‑based experiments.

CPU topologyKernel SchedulingNUMA

0 likes · 9 min read

Understanding Multi‑core Hardware Architecture and Linux sched_domain

Open Source Linux

Nov 29, 2022 · Cloud Native

Why Did My K8s Node Crash After a CPU Upgrade? Uncovering Static CPU Manager Policies

This article explains how upgrading a Kubernetes node's CPU while using the static CPU manager policy can cause kubelet startup failures, details the underlying CPU manager architecture and topology handling, and provides a simple two‑step recovery method.

CPU ManagerCPU topologyKubernetes

0 likes · 15 min read

Why Did My K8s Node Crash After a CPU Upgrade? Uncovering Static CPU Manager Policies

OPPO Kernel Craftsman

Apr 3, 2020 · Fundamentals

Linux CPU Load Balancing: Framework and Implementation Analysis

Linux kernel load balancing, explained through the 5.4.28 framework, defines precise CPU load via PELT, balances tasks according to each core’s capacity using hierarchical scheduling domains and groups, details class‑specific strategies, illustrates migration in a big‑little 8‑core system, and outlines the three balancing scenarios and their trigger mechanisms.

CFS SchedulerCPU SchedulerCPU topology

0 likes · 15 min read

Linux CPU Load Balancing: Framework and Implementation Analysis