[systemd-devel] Systemd Boot Time Optimization

[Dharma.B at microchip.com]

Hi,
Gentle reminder on this query.

On 18/07/24 11:52 am, Dharma B wrote:
> Hi Everyone,
> 
> We have recently migrated from sysvinit to systemd on our platforms,
> including sam9, sama5, and sama7 which feature various ARM architectures
> such as ARMv5, Cortex-A5, and Cortex-A7.
> 
> We observed different performance levels across these architectures,
> detailed as follows:
> 
> Performance comparison between three architectures using the
> core-image-minimal recipe in Yocto Project with a high-speed HP 64GB XC
> 100MB/s SD card.
> 
> *******************************
> 
> ARMv5 - sam9
> 
> Startup finished in 2.113s (kernel) + 14.090s (userspace) = 16.203s
> multi-user.target reached after 14.080s in userspace
> 
> Cortex-A5 - sama5
> 
> Startup finished in 2.254s (kernel) + 13.216s (userspace) = 15.470s
> multi-user.target reached after 13.185s in userspace
> 
> Cortex A7 - sama7
> 
> Startup finished in 1.967s (kernel) + 6.302s (userspace) = 8.270s
> multi-user.target reached after 6.271s in userspace
> 
> *******************************
> 
> We noted that the following services take significantly longer on the
> ARMv5 and Cortex-A5 architectures:
> 
> root at sam9x60-curiosity-sd:~# systemd-analyze blame
> 6.984s dev-mmcblk0p2.device
> 5.120s systemd-udev-trigger.service
> 3.063s systemd-networkd.service
> 1.938s systemd-journald.service
> 1.850s systemd-timesyncd.service
> 1.826s systemd-resolved.service
> 995ms systemd-fsck-root.service
> 
> Could you please let us know how to further breakdown the time taken by
> "dev-mmcblk0p2.device"
> 
> as we don't get anything with
> 
> systemd-analyze critical-chain dev-mmcblk0p2.device
> The time when unit became active or started is printed after the "@"
> character.
> The time the unit took to start is printed after the "+" character.
> 
> dev-mmcblk0p2.device +6.984s
> 
> Is it possible to achieve faster boot times on arm v5 and cortex a5
> these architectures similar to cortex a7 by tuning systemd?
> 
> 
> Best Regards,
> Dharma B.

-- 
With Best Regards,
Dharma B.