systemd-udev-settle.service - Wait for all pending udev events to be handled
systemd-udev-settle.service
This service calls
udevadm settle to wait until all events that have been
queued by
udev(7) have been processed. It is a crude way to wait until
"all" hardware has been discovered. Services may pull in this
service and order themselves after it to wait for the udev queue to be empty.
Using this service is not recommended. There can be no guarantee that
hardware is fully discovered at any specific time, because the kernel does
hardware detection asynchronously, and certain buses and devices take a very
long time to become ready, and also additional hardware may be plugged in at
any time. Instead, services should subscribe to udev events and react to any
new hardware as it is discovered. Services that, based on configuration,
expect certain devices to appear, may warn or report failure after a timeout.
This timeout should be tailored to the hardware type. Waiting for
systemd-udev-settle.service usually slows boot significantly, because it means
waiting for all unrelated events too.
udev(7),
udevadm(8)