If you're serious about boot time (and image size) reduction, your first step
should be to create your own DISTRO and your own image recipe. Scrap those
first words actually, I think this should be the first step in anything that's
to become a real product.
It's much more efficient to start empty en add what you need, then to start
with an everything-but-the-kitchen-sink image and then try to remove things
without breaking other things.
Putting things in ":remove" overrides is not going to work as you expect. If
package X has a run-time dependency on package Y, then package Y will be
installed regardless of whether you added a bunch of ZZZ:remove += "Y" in some
places. To get rid of Y, you'll have to remove or alter X.
Also start with analyzing your boot time. I've seen projects where people
spent weeks on removing services and gaining less than a second, while they
left a "bootdelay" active in U-boot. Of total 10 seconds boot time, three
seconds were spent twidling thumbs in U-boot. That's a 30% boot time
improvement in less than an hour's work.
A raspberrypi 4 for example will spend about 5 seconds in its closed-source
firmware at boot. Some things are just beyond your control.
On many embedded devices boot time is dominated by the IO speed of the boot
device. Just changing your rootfs type from ext4 into LZ4-compressed squashfs
often reduces the boot time noticably.
When using systemd, "systemd-analyze criticalpath" should be your starting
point.
M.
On 27-11-2024 07:25, sateesh m via lists.yoctoproject.org wrote:
Hi Team,
I want to improve my boot time so for that I want to disable few services
which is running during boot up. I want to disable below mentioned services.
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