2 ms·

I did that comparison a few years ago: https://www.daemonology.net/blog/2021-08-12-EC2-boot-time-benchmarking.html https://www.daemonology.net/blog/2021-08-12-E

• andai 2y ago
  Dang, Clear Linux boots in one second? How is it ten times faster?
  • transpute 2y ago
    Optimized for automotive use case (max 2s to enable rear camera), https://www.phoronix.com/news/Clear-Linux-Kernel-3s-to-300ms https://www.phoronix.com/news/Clear-Linux-Kernel-3s-to-300ms > They started out with around a three second kernel boot time but cut it down to just 300 ms. Among the optimizations carried out to really speed-up their boot time were ensuring more asynchronous driver probing, only initializing a small amount of RAM at start and then after booted hot-plug the rest of it in parallel via systemd, optimized root file-system mounting, disabling unnecessary kernel modules, and similar approaches. Moving forward they are still looking at optimizations for the boot process around in-kernel deferred memory initialization, SMP initialization changes, ACPI tweaking, and user-space/systemd optimizations.
  • homebrewer 2y ago
    It's been possible for a long time: https://lwn.net/Articles/299483 https://lwn.net/Articles/299483