Hi Robert,
I just realized that I need to use an overlayfs (via overlayroot) to
protect the emmc / OS from crashing on sudden power off.
Now overlaytroot needs the initrd image to work.
So I had to enable the /boot/initrd.img-4.19.94-ti-rt-r63 file.
Re-enablingthe initird file in /boot added about 48 to 50s to the kernel
boot time ;-(
Any ideas on how to mitigate that? how to get the booting time down?
Thanks & Regards,
-amit
debian@beaglebone:/$ systemd-analyze
Startup finished in 58.454s (kernel) + 49.641s (userspace) = 1min 48.096s
debian@beaglebone:/$ systemd-analyze blame
1min 21.167s dev-mmcblk1p1.device
10.477s generic-board-startup.service
5.278s systemd-udev-trigger.service
2.907s networking.service
2.684s ssh.service
2.328s keyboard-setup.service
1.940s dnsmasq.service
1.661s systemd-journald.service
1.101s systemd-user-sessions.service
895ms systemd-udevd.service
845ms [email protected]
785ms systemd-random-seed.service
766ms systemd-timesyncd.service
754ms systemd-tmpfiles-setup-dev.service
725ms systemd-modules-load.service
670ms systemd-update-utmp.service
657ms systemd-logind.service
645ms sys-kernel-config.mount
641ms sys-kernel-debug.mount
603ms systemd-tmpfiles-setup.service
572ms kmod-static-nodes.service
518ms rsyslog.service
515ms systemd-sysctl.service
408ms systemd-remount-fs.service
358ms slim.service
351ms console-setup.service
324ms systemd-journal-flush.service
280ms sys-fs-fuse-connections.mount
272ms systemd-tmpfiles-clean.service
228ms systemd-update-utmp-runlevel.service
223ms dev-mqueue.mount
On Friday, 21 May, 2021 at 12:32:08 pm UTC+5:30 Amit Goradia wrote:
> On Thursday, 20 May, 2021 at 11:01:42 pm UTC+5:30 RobertCNelson wrote:
>
>> > removed wpasupplicant and connman and old kernel
>> >
>> > sudo apt-get purge linux-image-4.14.108-ti-r134 wpasupplicant connman
>> >
>> > debian@beaglebone:~$ systemd-analyze
>> >
>> > Startup finished in 13.502s (kernel) + 36.686s (userspace) = 50.188s
>> >
>> > I then removed the initrd file in /boot directory (From what I
>> understand this kernel does not necessarily need initrd).
>> > debian@beaglebone:/boot$ sudo mv initrd.img-4.19.94-ti-rt-r63
>> moved-initrd.img-4.19.94-ti-rt-r63
>> >
>> > Removing the initrd gives the max speedup for kernel. From 10s-13s with
>> initrd, it reduces to 1s-2s
>> > debian@beaglebone:~$ systemd-analyze
>> > Startup finished in 1.663s (kernel) + 36.385s (userspace) = 38.048s
>> > debian@beaglebone:~$ systemd-analyze blame
>> > 1min 4.266s dev-mmcblk1p1.device
>> > 26.360s generic-board-startup.service
>> > 3.847s systemd-udev-trigger.service
>> > 2.824s loadcpufreq.service
>>
>> You can nuke this ^, it's really only for am57xx, so we can
>> downclock.. But on am335x, let it run at full speed as these are set:
>>
>> CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
>> CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
>>
>> > 2.215s networking.service
>> > 1.647s ssh.service
>> > 1.396s [email protected]
>> > 1.209s rsyslog.service
>> > 1.189s systemd-journald.service
>> > 999ms dnsmasq.service
>> > 897ms cpufrequtils.service
>>
>> Same as above..
>>
>> > 855ms systemd-timesyncd.service
>> > 674ms systemd-fsck-root.service
>> > 642ms systemd-logind.service
>> > 505ms systemd-udevd.service
>> > 445ms systemd-user-sessions.service
>> > 408ms systemd-tmpfiles-setup-dev.service
>> > 389ms systemd-update-utmp.service
>> > 375ms hostapd.service
>>
>> You nuked wpasupplicant, get rid of hostapd..
>>
>> > 365ms systemd-modules-load.service
>> > 326ms dev-mqueue.mount
>> > 324ms systemd-random-seed.service
>> > 312ms sys-kernel-config.mount
>> > 291ms systemd-tmpfiles-setup.service
>> > 274ms sys-kernel-debug.mount
>> > 236ms kmod-static-nodes.service
>> > 231ms sys-fs-fuse-connections.mount
>> > 200ms systemd-remount-fs.service
>> > 190ms systemd-journal-flush.service
>> > 185ms systemd-sysctl.service
>> > 145ms systemd-update-utmp-runlevel.service
>> > 130ms systemd-tmpfiles-clean.service
>> >
>> > Next point to attack is the generic-board-startup.service. The main
>> time that process spends is in the file /opt/scripts/boot/am335x_evm.sh
>> > This takes care of the USB flash, Serial and network gadgets that are
>> initialized. Remove items which are not needed. It also has a lot of
>> generic selections for Beagle family boards which can be removed. I am
>> working on my version for just beaglebone black with only network over USB
>> support.
>> > Some ideas can be found here (
>> https://github.com/RobertCNelson/boot-scripts/issues/10)
>> >
>> > Hope that helps.
>>
>> --
>> Robert Nelson
>> https://rcn-ee.com/
>
>
>
> Thanks a lot Robert. Your help is most appreciated.
> I have implemented your suggestions and removed the following services
> loadcpufreq.service
> cpufrequtils.service
> hostapd.service
> My current boot time still ranges between 48s to 52s
>
> debian@beaglebone:~$ systemd-analyze
> Startup finished in 1.751s (kernel) + 48.369s (userspace) = 50.120s
> debian@beaglebone:~$ systemd-analyze blame
> 1min 14.318s dev-mmcblk1p1.device
> 9.419s generic-board-startup.service
> 5.353s systemd-udev-trigger.service
> 2.470s keyboard-setup.service
> 2.438s networking.service
> 2.423s ssh.service
> 2.161s dnsmasq.service
> 1.718s systemd-logind.service
> 1.613s systemd-journald.service
> 1.018s systemd-timesyncd.service
> 969ms systemd-fsck-root.service
> 730ms systemd-udevd.service
> 595ms [email protected]
> 589ms rsyslog.service
> 549ms slim.service
> 500ms sys-kernel-debug.mount
> 488ms systemd-tmpfiles-setup-dev.service
> 479ms systemd-update-utmp.service
> 469ms dev-mqueue.mount
> 456ms systemd-sysctl.service
> 451ms systemd-tmpfiles-setup.service
> 384ms systemd-modules-load.service
> 380ms sys-kernel-config.mount
> 352ms systemd-journal-flush.service
> 344ms systemd-user-sessions.service
> 319ms systemd-update-utmp-runlevel.service
> 310ms systemd-random-seed.service
> 284ms kmod-static-nodes.service
> 257ms sys-fs-fuse-connections.mount
> 250ms systemd-remount-fs.service
> 227ms console-setup.service
>
> Any suggestions to bring it down further?
> I am using a X desktop with slim as the login manager with autologin on
> LCD.
> From the generic board startup services, I am using network over USB (not
> the serial over USB and flash over USB) parts.
> What else should I be able to nuke to get the time faster?
>
> Regards,
> -amit
>
>
>
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