Reducing the boot time of Linux devices
summary
A BeagleBone Black image boots from about 11.76s to 2.61s by applying measured changes: use grabserial, bootchart and bootgraph to find delays; start the GUI app before most userspace (a small PID‑1 script) to shave ~3.5s at the cost of systemd supervision; remove unused btrfs code (cuts ~1.8s), trim kernel from 5.6MB to 3.2MB (saves ~450ms), and disable U‑Boot delay plus simplify scripts (≈2.2s saved). Enabling Falcon mode can cut more but reduces flexibility.
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chapters (28)
- 0:00Introduction
- 0:58Linux devices
- 1:58How much effort
- 3:18How to improve boot time
- 5:18Measuring
- 7:15GrabCor
- 8:37Demo
- 10:17Optimizations
- 11:42Bootchart
- 15:02Kernel booting
- 15:22Moving up the batting order
- 17:44Run QT demo
- 19:21Boot time
- 19:59The kernel
- 22:45Boot graph
- 24:04Raid 6 select
- 26:14Bootloader
- 28:04Disable boot delay
- 29:21Buddha scripts
- 29:41Boot scripts
- 30:28Final measurement
- 31:51Conclusion
- 33:35Slides
- 34:18SystemD
- 36:23Boot Falcon Mode
- 40:07QA
- 44:20Android
- 47:35Catch early output
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