Systems GardenLong-form systems engineering essays and lightweight notes on kernels, performance, compilers, and distributed systems.https://draft-blog-captainirs-dev.pages.dev/Understanding Memory Pressure Without Paginghttps://draft-blog-captainirs-dev.pages.dev/posts/memory-pressure-without-paging/https://draft-blog-captainirs-dev.pages.dev/posts/memory-pressure-without-paging/A standalone post shape that is intentionally not part of any series, so the browse surfaces still exercise ordinary post rendering alongside series entries.Thu, 09 Apr 2026 00:00:00 GMTA tiny eBPF note: start with tracepoints before kprobeshttps://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 GMTWhat Changes Once the Radio Frame Arrives Without a Network Stack?https://draft-blog-captainirs-dev.pages.dev/series/bare-metal-wifi-experiments/rx-without-a-network-stack/https://draft-blog-captainirs-dev.pages.dev/series/bare-metal-wifi-experiments/rx-without-a-network-stack/The second part shifts from transmission to reception and looks at what breaks once packet parsing, buffering, and ownership rules stop being hidden behind a kernel network stack.Sun, 05 Apr 2026 00:00:00 GMTWhy your ConfigMap changes are not showing up in the container yethttps://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 GMTWhat Does It Take to Transfer 1 Byte Over Wi-Fi Without an OS?https://draft-blog-captainirs-dev.pages.dev/series/bare-metal-wifi-experiments/one-byte-over-wifi/https://draft-blog-captainirs-dev.pages.dev/series/bare-metal-wifi-experiments/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