kernel boot time changed from 4 sec to 14 sec

[Bernhard Riegler]

root@prod:/home/bernie22/fw# journalctl -b |grep finished
Jul 25 09:56:31 prod systemd[1]: Startup finished in 14.256s (kernel) + 3.272s (userspace) = 17.529s.
Jul 25 09:56:33 prod systemd[867]: Startup finished in 1.485s.
Jul 25 09:56:50 prod systemd[1222]: Startup finished in 4.712s.

I am talking about 14.256s (kernel), it was 4 second before fix level 50

journalctl -b -o short-monotonic
...
[ 0.451483] prod kernel: Key type asymmetric registered
[ 0.451488] prod kernel: Asymmetric key parser 'x509' registered
[ 1.478283] prod kernel: tsc: Refined TSC clocksource calibration: 2594.107 MHz
[ 1.478295] prod kernel: clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x25647d583cf, max_idle_ns: 440795304232 ns
[ 1.478322] prod kernel: clocksource: Switched to clocksource tsc
[ 12.118386] prod kernel: Freeing initrd memory: 66872K
[ 12.122081] prod kernel: alg: self-tests for CTR-KDF (hmac(sha256)) passed
[ 12.122120] prod kernel: Block layer SCSI generic (bsg) driver version 0.4 loaded (major 243)
...

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-5.19.0-50-generic 5.19.0-50.50
ProcVersionSignature: Ubuntu 5.19.0-50.50-generic 5.19.17
Uname: Linux 5.19.0-50-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Jul 25 11:49:04 2023
InstallationDate: Installed on 2022-05-31 (420 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
SourcePackage: linux-signed-hwe-5.19
UpgradeStatus: No upgrade log present (probably fresh install)

[Bernhard Riegler (riegler-b)]

"freeing initrd memory" pointed me in the right direction.

I have modified /etc/initramfs-tools/initramfs.conf short time before.
changed "COMPRESS=bzip2" and got a smaller file in the file-system

moved back to "COMPRESS=zstd" , update-initramfs -u and got the original filesize.
after reboot the effect with 10 sec delay was gone.