Long-form systems engineering essays and lightweight notes on kernels, performance, compilers, and distributed systems.https://draft-blog-captainirs-dev.pages.dev/https://draft-blog-captainirs-dev.pages.dev/notes/ebpf-first-tracepoint/https://draft-blog-captainirs-dev.pages.dev/notes/ebpf-first-tracepoint/If the goal is learning or getting a first signal quickly, tracepoints are often the cleaner entry point than kprobes. The interface is more stable, you spend less time chasing symbol details, and you still get a lot of practical observability value.Tue, 07 Apr 2026 00:00:00 GMThttps://draft-blog-captainirs-dev.pages.dev/notes/configmap-reload-delay/https://draft-blog-captainirs-dev.pages.dev/notes/configmap-reload-delay/The short-form lane exists for useful operational fragments. If your pod mounts a ConfigMap as a volume, kubelet refresh is not an immediate push path. There is a sync period and cache behavior in play, so a change may take longer than you intuitively expect.Fri, 03 Apr 2026 00:00:00 GMThttps://draft-blog-captainirs-dev.pages.dev/posts/one-byte-over-wifi/https://draft-blog-captainirs-dev.pages.dev/posts/one-byte-over-wifi/A long-form post shape that can carry deep systems work, experiments, and the breadcrumbs needed to make the story discoverable later.Wed, 01 Apr 2026 00:00:00 GMT