idlecore.me - notesMeasured notes on idle power, processor idle states and schedulers.https://idlecore.me/2026-10-06T00:00:00ZEdvin Kaldahello@idlecore.meWhat an idle login costshttps://idlecore.me/note-ssh-cost.html2026-10-06T00:00:00ZAn open interactive terminal adds about 1.2 W to the desk machine. Where the watt goes, and why every other note was taken with nobody logged in.Where 118 wakeups a second came fromhttps://idlecore.me/note-wakeups.html2026-09-18T00:00:00ZAccounting for every wakeup on an idle eight-core server: five sources, eighty removed, 1.2 W saved, and why the watts were not the point.Letting the disks sleephttps://idlecore.me/note-disk-aspm.html2026-05-19T00:00:00ZAllowing two NVMe disks their deepest link state saves 0.8 W on the bench and 0.3 W in duty, at the cost of a few milliseconds on a cold read.Taking four cores offline buys almost nothinghttps://idlecore.me/note-core-offline.html2026-01-28T00:00:00ZOfflining four of eight idle cores on the shelf server saved 0.3 W, inside the meter noise, while costing latency and operational grief.The idle loop is not freehttps://idlecore.me/note-idle-loop.html2025-09-30T00:00:00ZWhat deep processor idle states buy you, what a polling idle loop costs instead, and the two ways a residency script will quietly lie to you.What four governors cost at idlehttps://idlecore.me/note-governor-power.html2025-02-11T00:00:00ZIdle mains draw under the performance, ondemand, schedutil and powersave frequency governors on two machines, with the latency each one costs.