Optimise systemd service in root file system

[vinothkumars]

Hi All,

I am working on imx6solo + orion linux. I want to disable the systemd services for reduce the boot time and I analyse following systemd service by using the systemd-analyze blame command.

48.909s systemd-journald.service
36.501s dev-mmcblk0p1.device
16.426s systemd-journal-flush.service
10.382s udev-trigger.service
9.470s systemd-tmpfiles-setup.service
9.398s systemd-timesyncd.service
8.495s systemd-udevd.service
6.603s systemd-update-utmp.service
3.911s systemd-logind.service
3.527s remount-rfs-rw.service
3.448s systemd-tmpfiles-setup-dev.service
3.303s sys-fs-fuse-connections.mount
3.139s systemd-sysctl.service
2.358s systemd-remount-fs.service
2.175s udev.service
1.590s sys-kernel-debug.mount
1.369s systemd-random-seed.service
1.210s tmp.mount
1.113s systemd-update-utmp-runlevel.service
193ms systemd-networkd.service
191ms systemd-resolved.service

These services takes almost 1 minute 30 seconds to complete. 

Is there any possible way to disable these service when boot ? and I really want to disable in code side. 

Or I want to reduce the time.

Regards,

VinothS

[b36401]

There is nothing special regarding to i.MX. I can provide you some common recommendations.

You can remove all unnecessary options and modules from the kernel.
For example if you do not need ethernet you can compile the kernel without its support.

And you need to remove all unnecessary packages and disable all unnecessary services.

Have a great day,
Victor

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[vinothkumars]

Hi Victor,

Thank you for you reply.

Do you know how to disable the systemd services?

Regards, VinothS

[turker]

You can disable a service using "systemctl disable servicename" command or remove the related symlink under /etc/systemd/system/

[vinothkumars]

Thank you for your reply..

[vinothkumars]

I removed the systemd packages and now the boot take with in 10 seconds. I closed this thread now.

Regards,

VinothS

[Raana]

Hi Vinoth,

May I know, How you removed ? and where ?

Because, I'm trying to reduce the rootfs size. At the same time, do you know how to disable hwdb files ?

Thank You.

Best Regards,

J.P.Raja

[vinothkumars]

Hi,

I removed the whole systemd packages from the build.

Thanks,

VinotS,