Post #3075398
2026-04-16 20:01 UTC
@Valentin@mastodon.social my guess is that seek times kill you. I think cdroms/dvds have random seek times of 200ms or even more on old drives, which is abysmal. If you actually care about this you could start reading linearly into memory. On a dvd that's like 1.5mb/s though, i.e. also pretty awful... I.e. 90mb/min. So for 3gb it's too slow. What people used to do is profile what is actually accessed during boot and then put this stuff at the beginning of the medium, and read that in linearly.
Replies (2)
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@xjuan@mastodon.social 2026-04-16 20:20
@pid_eins@mastodon.social @Valentin@mastodon.social try padding with zeros at the beginning of the disk so that all files are at the outer edge of it
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@Valentin@mastodon.social 2026-04-16 20:34
@pid_eins@mastodon.social for the context of GNOME OS, I do not think there is a point optimizing for DVDs. But it sounds like a fun project. What I was interested in was if the new El Torito boot we added in systemd-repart worked out of the box on old firmware and with a big ESP. It does. But turns out AMI did not like how systemd-boot loads the UKI. I will open a PR that fixes that this weekend. And then others can start fun projects.