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Alexander Rössler
Nov 15, 2017, 3:51:29 AM11/15/17
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Hello everyone,
I'm using the latest IoT images for the BBB and noticed that the bootup time from the eMMC is very slow. it takes ~1.5min for the USB gadget network interface to appear under Linux.
What can I do to improve the startup performance of the BBB?
So far I have disabled auto for the eth0 interface.
sudo nano /etc/network/interfaces
allow-hotplug eth0
Moreover, I have disabled graphical boot.
systemctl set-default multi-user.target
systemctl get-default
Still very slow is the generic-board-startup.service
1min 53.980s dev-mmcblk1p1.device
1min 50.627s generic-board-startup.service
4.208s ModemManager.service
4.106s systemd-udev-trigger.service
2.366s networking.service
2.032s NetworkManager.service
1.973s capemgr.service
1.838s systemd-journald.service
1.809s pppd-dns.service
1.579s dnsmasq.service
1.486s rsyslog.service
1.098s avahi-daemon.service
920ms systemd-logind.service
856ms systemd-udevd.service
845ms bb-wl18xx-wlan0.service
737ms sys-fs-fuse-connections.mount
730ms ssh.service
724ms systemd-sysctl.service
719ms systemd-timesyncd.service
651ms sys-kernel-debug.mount
604ms systemd-update-utmp.service
592ms dev-mqueue.mount
559ms sys-kernel-config.mount
493ms systemd-remount-fs.service
458ms polkit.service
448ms systemd-user-sessions.service
414ms systemd-tmpfiles-setup-dev.service
413ms systemd-tmpfiles-setup.service
360ms systemd-random-seed.service
359ms systemd-journal-flush.service
319ms systemd-modules-load.service
319ms kmod-static-nodes.service
225ms systemd-update-utmp-runlevel.service
168ms bb-wl18xx-bluetooth.service
I noticed that SSH key regeneration takes ~15s at boot. However, when I removed /etc/ssh/ssh.regenerate USB networking did not work anymore.
What else can I do to make the BBB boot faster?
din...@gmail.com
Nov 15, 2017, 1:56:42 PM11/15/17
to BeagleBoard
Could you post your dmesg log?
Robert Nelson
Nov 15, 2017, 1:59:43 PM11/15/17
to Beagle Board
This is only an issue on first boot, as the keys are only generated once.
What else can I do to make the BBB boot faster?
Use the v4.14.x based kernel.
As I've spent some time building in and disabling unneeded modules.
Regards,
Alexander Rössler
Nov 18, 2017, 10:00:49 AM11/18/17
to BeagleBoard
I need an RT kernel, so 4.14 does not work for me, yet.
Are there any improvements with 4.9 over 4.4?
Robert Nelson
Nov 18, 2017, 11:34:47 AM11/18/17
to Beagle Board
On Nov 18, 2017 9:01 AM, "Alexander Rössler" <mail.ar...@gmail.com> wrote:
I need an RT kernel, so 4.14 does not work for me, yet.Are there any improvements with 4.9 over 4.4?
Rt just came out for v4.14
I'll have something later tonight, when my plane lands.
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Alexander Rössler
Nov 21, 2017, 10:46:20 AM11/21/17
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Nice, thanks!
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Alexander Rössler
Nov 21, 2017, 11:38:32 AM11/21/17
to BeagleBoard
Interesting, I noticed that my ssh keys where regenerated at every single boot thanks to a wrong sshd_config.
However, after fixing this problem, my usb0 interface does not connect anymore.
Troy Weber
Feb 26, 2018, 2:02:05 PM2/26/18
to BeagleBoard
That 4.14 kernal definitely improved the boot times compared to what I was seeing and what I posted here: https://github.com/RobertCNelson/boot-scripts/issues/10
Can anything be done to really trim down the boot time to be not much more than the kernel boot time? And what does one sacrifice in doing so? A 30 second boot would be great. This 60 boot isn't too bad, either, of course, thanks for your work on that kernel 4.14.
However, I am still getting a boot time of close to a minute (~32 seconds for both dev-mmcblk1p1.device and generic-board-startup.service).
# systemd-analyze Startup finished in 21.569s (kernel) + 37.032s (userspace) = 58.602s
# systemd-analyze blame 32.599s dev-mmcblk1p1.device 31.957s generic-board-startup.service 3.137s systemd-udev-trigger.service 2.602s loadcpufreq.service 2.090s networking.service 1.638s ssh.service 1.542s connman.service 1.385s systemd-logind.service 1.196s systemd-journald.service 1.164s avahi-daemon.service 1.158s udhcpd.service 841ms dnsmasq.service 833ms pppd-dns.service 786ms bb-wl18xx-wlan0.service 623ms cpufrequtils.service 536ms systemd-timesyncd.service 497ms rsyslog.service 445ms wpa_supplicant.service 416ms systemd-random-seed.service 367ms systemd-udevd.service 350ms kmod-static-nodes.service 333ms systemd-modules-load.service 314ms systemd-sysctl.service 311ms systemd-user-sessions.service 311ms hostapd.service 304ms systemd-update-utmp.service 303ms sys-kernel-debug.mount 301ms sys-kernel-config.mount 297ms systemd-remount-fs.service 275ms systemd-tmpfiles-setup.service 248ms systemd-journal-flush.service 220ms media-sd.mount 206ms systemd-tmpfiles-setup-dev.service 191ms sys-fs-fuse-connections.mount 185ms us...@0.serviceCan anything be done to really trim down the boot time to be not much more than the kernel boot time? And what does one sacrifice in doing so? A 30 second boot would be great. This 60 boot isn't too bad, either, of course, thanks for your work on that kernel 4.14.
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