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steal units for e.g. dropbear from Arch linux. • mask sysV duplicates with different
names. (dbus vs dbus-1). • complain a lot in the #systemd channel zondag 23 ...
ELCE-E/T-DOSE 2011 Booting userspace in less than 1 second
zondag 23 oktober 2011
Defining boot time
• from power up to usable state?
zondag 23 oktober 2011
Angstrom running on beagleboard • Reasonably fast platform - 1GHz Cortex A8
• Distro optimized for the platform • I work at TI • I’m part of the beagleboard.org team zondag 23 oktober 2011
Cheating • switching to pandaboard (dual 1GHz
Cortex A9) after noticing boot is CPU bound after doing all the work explained later on
zondag 23 oktober 2011
Boot up sections • ROM code based loader • First stage bootloader (MLO) • Second stage bootloader (u-boot.bin) • Kernel • Base userspace (system session) • Applications (user session) zondag 23 oktober 2011
The current situation • ROM code based loader - instantanious • First stage bootloader (MLO) - 0.1 - 0.5s • Second stage bootloader (u-boot.bin) - 12s • Kernel - 7s • Base userspace (system session) - 120s • Applications (user session) - 20s zondag 23 oktober 2011
Solutions • bootloader/kernel startup optimizations are known and presented to death at each ELC(-E)
• User session optimization has people working on it as well
• But those require significant code changes zondag 23 oktober 2011
I lack coding skills!
zondag 23 oktober 2011
Do what you do best • Attack the part that is the slowest • Attack the part that only involves shell • Try the solution written by rockstars
zondag 23 oktober 2011
systemd! • not systemD • not system d • certainly not système d
zondag 23 oktober 2011
systemd • replacement for sysvinit • from the ground up new design • emphasis on parallellism
zondag 23 oktober 2011
why systemd? • website listed rockstar developers I’ve met in person (Lennart, Gustavo)
• website listed an embedded consulting firm for optional support
• At the time scheduled to be standard in Fedora, F15 and F16 have it standard
zondag 23 oktober 2011
why systemd? - 2 • No shell scripts! • unit structure design resembles bitbake recipes
• cross compiles cleanly • autotools build system • source managed in git at freedesktop.org zondag 23 oktober 2011
First steps • watch all videos of systemd presentations • read nearly all blog posts about systemd • join #systemd on freenode
zondag 23 oktober 2011
First steps - 2 • Try existing recipe • Get serial console working • Boot a small rootfs • Get timing info zondag 23 oktober 2011
As slow as sysVinit :(
zondag 23 oktober 2011
Digging deeper • use builtin units for udev, dbus, avahi, etc • steal units for e.g. dropbear from Arch linux • mask sysV duplicates with different names (dbus vs dbus-1)
• complain a lot in the #systemd channel zondag 23 oktober 2011
from ±60 seconds to ±18 seconds
zondag 23 oktober 2011
• show http://dominion.thruhere.net/koen/
angstrom/systemd/before-udev-cleanup.svg
zondag 23 oktober 2011
Still not good enough • time (udevadm trigger ; udevadm settle) • always 180 seconds • same amount of time as time-out after accept4() call
zondag 23 oktober 2011
Toolchain problem • sys_accept4() is added for ARM in 2.6.36 • (e)glibc built against 2.6.32 headers • beagle running 2.6.32, panda 2.6.35 • backport, cherry-pick, update, rebuild zondag 23 oktober 2011
Toolchain solution • (e)glibc rebuilt against 2.6.37 headers • beagle running 2.6.32 + accept() patch, panda 2.6.35 + accept4() patch
zondag 23 oktober 2011
down to ±3 seconds
zondag 23 oktober 2011
• show http://dominion.thruhere.net/koen/ angstrom/systemd/after-udev-cleanup.svg
zondag 23 oktober 2011
Making it even faster • remove unused udev rules • remove unused units (vconsole, mounts) • switch to a faster machine
zondag 23 oktober 2011
Down to 1.1 seconds
zondag 23 oktober 2011
• Show http://dominion.thruhere.net/koen/ angstrom/systemd/omap4430panda-201110190919.svg
zondag 23 oktober 2011
Trying to make it < 1s • Since we’re at 1.1s, why not try going subsecond?
• CPUfreq governor -> performance • Faster SD card • more complaining in #systemd zondag 23 oktober 2011
