Ubuntu
linux package

  1. Bug #1626436
  2. Comment #26

Comment 26 for bug 1626436

Revision history for this message
Florian W. (florian-will) wrote :

My boot time comparison: (Wall clock time from GRUB to lightdm ready for login)
4.4: 12.28s
4.8.0-26 + Patches (Joseph's kernel): 21.78s
4.8.0-22 (Yakkety): 25.06s

This is with NetworkManager-wait-online.service enabled, which seems to take ~8s in my case.

The attached file has systemd-analyze (blame|critical-chain) output for each boot. Seems like slowdowns are all over the place, with some exceptions like nmbd. nmbd takes 5.1s no matter which kernel I use.

And apparmor.service behaves opposite to boot time in this case: When boot is slower, apparmor.service loads faster.

Loading times after typing my password into lightdm appear to correlate with boot times, but I haven't measured them. Noticably slower with 4.8 compared to 4.4.

I don't have enough time to learn how to compile Ubuntu kernel packages and start a bisection right now, but maybe I can start an attempt next week. My CPU is old / slow though, so that will probably take some time.