Have been using fedora since version 14 from my early college days, the most liked thing about fedora was the faster boot time compared to other flavous of linux distributions.
I am using a old laptop having intel core 2 duo processor , 4GB ram , intel gm965 chipset, from fedora 24 there is something unusual boot times are terribly slow taking more than 3 minutes.
Here is a boot time report generated from systemd, its taking nearly 5 minutes to complete the systemd boot process.
#sudo systemd-analyze Startup finished in 2.594s (kernel) + 2min 7.113s (initrd) + 2min 2.870s (userspace) = 4min 12.578s
Inspecitng dmesg logs shows error
[ 414.687273] [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* [CRTC:41:pipe B] flip_done timed out
[ 424.927280] [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* [PLANE:35:plane B] flip_done timed out
After browsing google found out this a bug with xorg
a detailed info about the bug can be found at
https://bugzilla.redhat.com/show_bug.cgi?id=1398424
Fixing the issue now.
#Getting the error from dmesg command.
#dmesg [ 414.687273] [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* [CRTC:41:pipe B] flip_done timed out [ 424.927280] [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* [PLANE:35:plane B] flip_done timed out
#Checking boot time
#sudo systemd-analyze
Startup finished in 2.594s (kernel) + 2min 7.113s (initrd) + 2min 2.870s (userspace) = 4min 12.578s
#sudo systemd-analyze blame
1min 33.835s dracut-initqueue.service
1min 15.467s plymouth-quit-wait.service
26.412s initrd-cleanup.service
26.400s plymouth-switch-root.service
26.370s dkms.service
20.990s cups.service
18.168s NetworkManager-wait-online.service
15.860s colord.service
15.745s firewalld.service
14.310s libvirtd.service
14.127s accounts-daemon.service
10.943s lvm2-monitor.service
10.825s lircd-setup.service
10.789s systemd-udev-settle.service
10.080s dev-sdb3.device
9.135s sensord.service
8.534s NetworkManager.service
7.596s ModemManager.service
6.745s rpc-statd-notify.service
6.637s polkit.service
5.678s initrd-switch-root.service
5.658s unbound-anchor.service
4.870s systemd-journal-flush.service
4.473s systemd-logind.service
4.426s lm_sensors.service
4.148s gssproxy.service
4.104s akmods.service
4.101s livesys.service
3.846s udisks2.service
3.829s wpa_supplicant.service
3.814s rtkit-daemon.service
3.807s avahi-daemon.service
3.803s bluetooth.service
3.632s ksm.service
3.631s systemd-fsck-root.service
3.455s netcf-transaction.service
2.911s dnf-makecache.service
2.864s systemd-udevd.service
2.733s fedora-readonly.service
2.435s systemd-tmpfiles-setup-dev.service
1.677s upower.service
1.393s systemd-vconsole-setup.service
948ms lightdm.service
915ms auditd.service
874ms systemd-random-seed.service
789ms chronyd.service
We need to make changes to grub2 adding video=SVIDEO-1:d to make error go away
#lets check the boot time after modifications, well the time has reduced to just about a minute
#sudo systemd-analyze Startup finished in 2.595s (kernel) + 4.526s (initrd) + 1min 2.493s (userspace) = 1min 9.615s
systemd-analyze critical-chain
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.
graphical.target @53.018s
└─multi-user.target @53.017s
└─libvirtd.service @31.849s +14.344s
└─network.target @31.834s
└─wpa_supplicant.service @36.707s +988ms
└─dbus.service @16.916s
└─basic.target @16.516s
└─sockets.target @16.516s
└─virtlockd.socket @16.515s
└─sysinit.target @16.488s
└─systemd-update-utmp.service @16.444s +43ms
└─auditd.service @15.570s +871ms
└─local-fs.target @14.849s
└─media-data.mount @14.767s +81ms
└─local-fs-pre.target @14.710s
└─lvm2-monitor.service @4.011s +10.188s
└─lvm2-lvmetad.service @4.656s
└─lvm2-lvmetad.socket @3.917s
└─-.slice
Additionally if you are not using lvm you can disable services like lvm2-monitor.service systemd-udev-settle.service NetworkManager-wait-online.service to optimmize boot times further.