Linux on mc · noteshttps://hk.crepuscule.uk/tags/linux/Recent content in Linux on mc · notesHugoen-usMon, 12 Jan 2026 18:50:00 +0800eBPF: tracing syscalls without a kernel modulehttps://hk.crepuscule.uk/posts/ebpf/Mon, 12 Jan 2026 18:50:00 +0800https://hk.crepuscule.uk/posts/ebpf/Attaching a verified program to a tracepoint, and why this beats strace under load.Tuning TCP BBR and fq on a high-latency linkhttps://hk.crepuscule.uk/posts/bbr/Mon, 03 Nov 2025 22:15:00 +0800https://hk.crepuscule.uk/posts/bbr/Switching off loss-based congestion control on a long-fat path, and the fq gotcha for UDP.A first, honest look at io_uringhttps://hk.crepuscule.uk/posts/io-uring/Thu, 22 May 2025 20:40:00 +0800https://hk.crepuscule.uk/posts/io-uring/Two ring buffers, one syscall, and the mental model that finally made it click.Notes on cgroups v2: memory limits that actually holdhttps://hk.crepuscule.uk/posts/cgroups-v2/Sun, 09 Mar 2025 21:10:00 +0800https://hk.crepuscule.uk/posts/cgroups-v2/Why my OOM kills moved around after switching to the unified hierarchy, and the three knobs that matter.