shorten pi boot time - Githubissues

DIYBookScanner / spreadpi

Raspberry Pi image for controlling a DIYBookScanner via spreads

GNU General Public License v2.0

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shorten pi boot time #11

Closed markvdb closed 10 years ago

markvdb commented 10 years ago

Whatever we can shave off of the pi's boot time before loading spreads should go in here. Let's start by measuring boot time with a fast sd card.

matti-kariluoma commented 10 years ago

I dunno how well-supported or realiable it is... but: linux has resume-from-hibernate. we could have the freshly-installed first run state as a hibernated state, disable creation of new hibernation states, and always resume from the same state.

downside: hard/infeasible for user to add software/daemons to their pi...?

upside: we never need to deal with it, since the hibernate-state is made when we build the image, and if we add software we can just build a new image.

markvdb commented 10 years ago

"1GHz 512MB overclocked and force_turbo=1 Pi, with a Class 10 SDHC, all desktop cruft removed, will boot headless Raspbian in approximately 38 seconds, start to finish."

markvdb commented 10 years ago

Some hints:

check init scripts if alsa-utils, ntp, fake-hwclock initscripts are disabled in default image. See also sysv-rc-conf
remove ssh daemon from final images
add kernel option quiet to /boot/cmdline.txt
high speed sd card
http://rpitc.blogspot.com/p/docs.html
noatime nodiratime kernel options
remove motd
fastest possible SD card
disable logging during boot (syslog.conf) or mount /var/log as tmpfs
disable swap (if any)
systems instead of sysv init?
remove raid, lvm, btrfs and other unneeded filesystems

markvdb commented 10 years ago

Checked performance hints. Added noatime, nodiratime, moved /var/log and /var/run to tmpfs