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. ** Attachment added: "boot times.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1626436/+attachment/4766355/+files/boot%20times.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1626436 Title: [4.8 regression] boot has become very slow To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1626436/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
