linux-kernel — 2 Technical Articles

Feb 4, 2025 · Fundamentals

Why Does My Upgraded Chumby 8 Show 100% CPU Usage? Uncovering a Hidden Kernel Timer Bug

After upgrading a PXA166‑based Chumby 8 from Linux 2.6.28 to 6.x, the top command constantly reported 100% CPU usage, leading the author through profiling, kernel source analysis, procfs inspection, and a timer‑register sequencing bug that was finally fixed by adjusting the delay in the timer_read function.

ARMCPU usagebusybox

0 likes · 24 min read

Why Does My Upgraded Chumby 8 Show 100% CPU Usage? Uncovering a Hidden Kernel Timer Bug

Bin's Tech Cabin

Nov 9, 2022 · Fundamentals

Why Does a Server Need to Call listen()? Uncovering Linux’s Socket Queue Mechanics

This article explains why a server must invoke listen() after bind(), detailing the kernel's listen system call, how it creates and initializes the full‑connection and half‑connection queues, and how their lengths are calculated based on backlog, somaxconn, and tcp_max_syn_backlog parameters.

Socketbackendlinux-kernel

0 likes · 14 min read

Why Does a Server Need to Call listen()? Uncovering Linux’s Socket Queue Mechanics