{
  "site": "idlecore.me",
  "author": "Edvin Kalda",
  "updated": "2026-10-06",
  "notes": [
    {
      "title": "What an idle login costs",
      "url": "/note-ssh-cost.html",
      "date": "2026-10-06",
      "machine": "desk machine",
      "summary": "An open interactive terminal adds about 1.2 W to the desk machine; where the watt goes and why it spoils every other reading.",
      "tags": ["power", "ssh", "login", "method", "desk machine"]
    },
    {
      "title": "Where 118 wakeups a second came from",
      "url": "/note-wakeups.html",
      "date": "2026-09-18",
      "machine": "shelf server",
      "summary": "Accounting for every wakeup on an idle eight-core server, removing eighty, saving 1.2 W, and why the watts were not the point.",
      "tags": ["wakeups", "interrupts", "residency", "shelf server"]
    },
    {
      "title": "Letting the disks sleep",
      "url": "/note-disk-aspm.html",
      "date": "2026-05-19",
      "machine": "shelf server",
      "summary": "Allowing two NVMe disks their deepest link state saves 0.8 W on the bench and 0.3 W in duty, costing a few milliseconds on a cold read.",
      "tags": ["disk", "nvme", "aspm", "latency", "shelf server"]
    },
    {
      "title": "Taking four cores offline buys almost nothing",
      "url": "/note-core-offline.html",
      "date": "2026-01-28",
      "machine": "shelf server",
      "summary": "Offlining half of an idle eight-core server saves 0.3 W, inside the meter noise, and costs latency and operational trouble.",
      "tags": ["cores", "cpu", "offline", "idle", "shelf server"]
    },
    {
      "title": "The idle loop is not free",
      "url": "/note-idle-loop.html",
      "date": "2025-09-30",
      "machine": "desk machine",
      "summary": "What deep idle states buy, what a polling idle loop costs instead, and two ways a residency script quietly lies.",
      "tags": ["c-states", "idle", "residency", "polling", "desk machine"]
    },
    {
      "title": "What four governors cost at idle",
      "url": "/note-governor-power.html",
      "date": "2025-02-11",
      "machine": "both",
      "summary": "Idle mains draw under performance, ondemand, schedutil and powersave governors on two machines, with the latency each costs.",
      "tags": ["governor", "frequency", "power", "latency", "schedutil"]
    }
  ]
}