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There is this time skip during kernel boot:

Jul 19 14:07:02 deetabokkusu kernel: [    2.874776] hub 1-1.4:1.0: USB hub found
Jul 19 14:07:02 deetabokkusu kernel: [    2.877993] hub 1-1.4:1.0: 4 ports detected
Jul 19 14:07:02 deetabokkusu kernel: [   94.080339] raid6: sse2x1   gen()   858 MB/s
Jul 19 14:07:02 deetabokkusu kernel: [   94.128306] raid6: sse2x1   xor()  2371 MB/s
Jul 19 14:07:02 deetabokkusu kernel: [   94.176324] raid6: sse2x2   gen()  1730 MB/s
Jul 19 14:07:02 deetabokkusu kernel: [   94.224328] raid6: sse2x2   xor()  2816 MB/s
Jul 19 14:07:02 deetabokkusu kernel: [   94.272285] raid6: sse2x4   gen()  2430 MB/s
Jul 19 14:07:02 deetabokkusu kernel: [   94.320302] raid6: sse2x4   xor()  2333 MB/s
Jul 19 14:07:02 deetabokkusu kernel: [   94.323121] raid6: using algorithm sse2x4 gen() 2430 MB/s
Jul 19 14:07:02 deetabokkusu kernel: [   94.325949] raid6: .... xor() 2333 MB/s, rmw enabled
Jul 19 14:07:02 deetabokkusu kernel: [   94.328762] raid6: using ssse3x2 recovery algorithm
Jul 19 14:07:02 deetabokkusu kernel: [   94.335698] xor: measuring software checksum speed
Jul 19 14:07:02 deetabokkusu kernel: [   94.376549]    prefetch64-sse:  7668.000 MB/sec
Jul 19 14:07:02 deetabokkusu kernel: [   94.416564]    generic_sse:  6661.000 MB/sec
Jul 19 14:07:02 deetabokkusu kernel: [   94.419385] xor: using function: prefetch64-sse (7668.000 MB/sec)
Jul 19 14:07:02 deetabokkusu kernel: [   94.426733] async_tx: api initialized (async)
Jul 19 14:07:02 deetabokkusu kernel: [   94.555496] Btrfs loaded, crc32c=crc32c-intel

systemd-analyze returns:

Startup finished in 1min 34.896s (kernel) + 38.914s (userspace) = 2min 13.810s graphical.target reached after 5.169s in userspace

systemd-analyze blame returns:

25.913s apt-daily.service 9.181s apt-daily-upgrade.service 2.131s dev-sda2.device 1.325s snapd.service 729ms media-duraibu1.mount 717ms networkd-dispatcher.service

I am not running a RAID on the system. What do I have to change for the kernel to boot more quickly?

Edit: What I am interested in is the kernel boot time of 1 min 34.896s. I know how to improve the userspace boot time of 38.914s with the information systemd-analyze blame gave me.

Edit 2: Booting with two other LTS Kernels (v4.19.59 and v4.14.133) did not change the problem

nucleus
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  • Run this and see maybe some systemd service take up time systemd-analyze blame. – Michal Przybylowicz Jul 19 '19 at 17:48
  • system-analyze blame only shows the time up take for userspace services, doesn't it? the highest uptake is "3.290s dev-sda2.device" -> that seems ok to me. the problem is the kernel startup time which is at 1min 35.095s as shown by systemd-analyze: Startup finished in 1min 35.095s (kernel) + 3.321s (userspace) = 1min 38.416s – nucleus Jul 19 '19 at 17:57
  • What is your kernel version? Did you try booting with previous kernel version? – WinEunuuchs2Unix Jul 20 '19 at 00:10
  • @WinEunuuchs2Unix Kernel is Linux 4.15.0-54-generic x86_64. no i did not try that yet... how do I do that? and: isn't there a way to get more information on what exactly is taking so long during the kernel startup? – nucleus Jul 20 '19 at 00:39
  • When booting from grub menu select Advanced options for Ubuntu and from that pick the second kernel version. As @MichalPrzybylowicz said early run systemd-analyze blame to find out what is taking so long. Note you posted same question on SuperUser: https://superuser.com/questions/1461801/ubuntu-kernel-boot-stuck-at-raid6-sse2x1-gen-858-mb-s Did you opt for btrfs file system instead of conventional ext4 file system? – WinEunuuchs2Unix Jul 20 '19 at 02:10
  • @WinEunuuchs2Unix I added the return of systemd-analyze blame to my post. But as I pointed out earlier it does not help me with my problem as it only shows me the time uptake of services that start during userspace startup. I am interested in the services that start during kernel startup which consume way more time. I'll look into changing the file system and booting with a different kernel version and post my results later! – nucleus Jul 20 '19 at 10:05
  • @WinEunuuchs2Unix booting with previous kernel did not change the problem – nucleus Jul 20 '19 at 12:46
  • Possible duplicate of How to diagnose/fix very slow boot on Ubuntu 18.04 – karel Nov 17 '19 at 04:28

0 Answers0