Kay Sievers wrote: > In many cases it's the loading of modules which is pretty expensive. > Sometimes rules are doing weird things. Sometimes just a single device > blocks the wait-for-all settle call. > > On the box with the 3 seconds, what devices are left when you limit the timeout? > udevadm trigger; udevadm settle --timeout=2 > The above command outputs nothing, > How long does udev take on the running box? > I captured the output of the monitor during the above command, here's the first KERNEL event and the last UDEV event on the running system: KERNEL[1242835745.179673] add /devices/LNXSYSTM:00 (acpi) UDEV [1242835748.458242] add /devices/pci0000:00/0000:00:06.0/usb4/4-1/4-1.1/4-1.1:1.0/bluetooth/hci0 (bluetooth) > What does: > $ time (udevadm trigger -Snet; udevadm settle) > print? That should show the time while no more modules need to be loaded. > mecbuk cups # time (udevadm trigger; udevadm settle) real 0m2.579s user 0m0.013s sys 0m0.011s Subsequent calls shows 1.7~, 1.5~, 1.9~, 2.0~ seconds. > How big are the rules you use? > wc -l /etc/udev/rules.d/* /lib/udev/rules.d/* /dev/.udev/rules.d/* > mecbuk cups # wc -l /lib/udev/rules.d/* /etc/udev/rules.d/* /dev/.udev/rules.d/* | tail -n1 wc: /dev/.udev/rules.d/*: No such file or directory 1817 total A typical udev, udev-extras installation + 1-2 extra rules like gphoto2, wacom, bluez, etc. > What does: > udevadm test foo > print? > mecbuk cups # udevadm test foo run_command: calling: test udevadm_test: version 142 This program is for debugging only, it does not run any program, specified by a RUN key. It may show incorrect results, because some values may be different, or not available at a simulation run. parse_file: reading '/lib/udev/rules.d/10-lirc.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-alsa.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-gentoo.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-ia64.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-infiniband.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-isdn.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-pilot-links.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-zaptel.rules' as rules file parse_file: reading '/lib/udev/rules.d/50-firmware.rules' as rules file parse_file: reading '/lib/udev/rules.d/50-udev-default.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-cdrom_id.rules' as rules file parse_file: reading '/etc/udev/rules.d/60-libgphoto2.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-logitechmouse.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-pcmcia.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-persistent-input.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-persistent-serial.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-persistent-storage-tape.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-persistent-storage.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-persistent-v4l.rules' as rules file parse_file: reading '/lib/udev/rules.d/60-wacom.rules' as rules file parse_file: reading '/lib/udev/rules.d/61-mobile-action.rules' as rules file parse_file: reading '/lib/udev/rules.d/61-option-modem-modeswitch.rules' as rules file parse_file: reading '/lib/udev/rules.d/61-persistent-storage-edd.rules' as rules file parse_file: reading '/lib/udev/rules.d/64-device-mapper.rules' as rules file parse_file: reading '/lib/udev/rules.d/64-md-raid.rules' as rules file parse_file: reading '/lib/udev/rules.d/70-acl.rules' as rules file parse_file: reading '/lib/udev/rules.d/70-bluetooth.rules' as rules file parse_file: reading '/etc/udev/rules.d/70-persistent-cd.rules' as rules file parse_file: reading '/etc/udev/rules.d/70-persistent-net.rules' as rules file parse_file: reading '/lib/udev/rules.d/75-cd-aliases-generator.rules' as rules file parse_file: reading '/lib/udev/rules.d/75-persistent-net-generator.rules' as rules file parse_file: reading '/lib/udev/rules.d/78-sound-card.rules' as rules file parse_file: reading '/lib/udev/rules.d/80-drivers.rules' as rules file parse_file: reading '/lib/udev/rules.d/90-hal.rules' as rules file parse_file: reading '/lib/udev/rules.d/91-drm-modeset.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-udev-late.rules' as rules file parse_file: reading '/lib/udev/rules.d/97-bluetooth-pcmcia.rules' as rules file parse_file: reading '/lib/udev/rules.d/99-comar-ethernet.rules' as rules file parse_file: reading '/lib/udev/rules.d/99-comar-wireless.rules' as rules file parse_file: reading '/lib/udev/rules.d/99-fuse.rules' as rules file udev_rules_new: rules use 78048 bytes tokens (6504 * 12 bytes), 17584 bytes buffer udev_rules_new: temporary index used 28500 bytes (1425 * 20 bytes) -- To unsubscribe from this list: send the line "unsubscribe linux-hotplug" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
