systemd-udev-settle.service - Wait for all pending udev events to be handled
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.