Hi, Martin Guy (2021-02-23): > I assume it would be feasible to record the sequence of disk accesses > during a normal boot from CD/DVD and ensure that the required blocks > are in the ISO in linear disk-reading order, which should speed boot > time from optical media. > > I guess that means booting the ISO image during the build in something > virtual, with a magic kernel option to make it spew all the disk > access addresses, then reorder the ISO accordingly. > > Does anyone know if this is already done in live-build, or if any > other ISO build systems do this?
We do something like this at Tails, using inotify, except: - We update the SquashFS ordering as part of our release process, not as part of the build. - It's not fully automated. Some manual work is required. - Nowadays, we optimize for booting from USB drives, not DVD. The implementation remained identical though. For details, look for files called *boot-profile, and "git grep boot-profile", in our Git repo: https://gitlab.tails.boum.org/tails/tails/ Cheers!
