Boot Time

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This page has information about reducing boot-up time for a Linux system. This is of interest for many embedded developers, because for many products customers expect to be able to use them very soon after system startup.

Technology/Project Pages

The following are individual pages with information about various technologies relevant to improving boot-up time for Linux. Some of these describe local patches available on this site. Others point to projects or patches maintained elsewhere.

Measuring Boot-up Time

Technologies and Techniques for Reducing Boot-up Time

  1. use of mmap vs. read
  2. control over page mapping characteristics.


Case Studies

Additional Projects/Mailing Lists/Resources


  • Kexec is a system which allows a system to be rebooted without going through BIOS. That is, a Linux kernel can directly boot into another Linux kernel, without going through firmware. See the white paper at: kexec.pdf


  • - technology to put up a splash screen early in boot sequence
  • Gentoo Splashscreen - newer technology to put a splash screen early in the boot sequence
  • PSplash - PSplash is a userspace graphical boot splash screen for mainly

embedded Linux devices supporting a 16bpp or 32bpp framebuffer.

  • FSMLabs Fastboot - press release by FSMLabs about fast booting of their product. Is any of this published?
  • Bootchart - a tool for performance analysis and visualization of the Linux boot process. Resource utilization and process information are collected during the user-space portion of the boot process and are later rendered in a PNG, SVG or EPS encoded chart.