Improving Linux Boot Time for Automotive Use Cases
summary
Kernel bring-up reaches user space in about 350 ms to userspace on the tested aarch64 board after targeted changes: linear map creation drops from 350ms→25ms with removed memory barriers, module vs builtin storage probing falls from ~0.75s to ~0.22s when built in, and RCU is temporarily set to expedited during boot to avoid long grace periods. Initramfs uses LZ4 initramfs and a minimized systemd via dracut/dracut-automotive while autoinit replaces udev in early userspace; measurements use systemd-analyze, boot-time SIG tools and Red Hat boot tools (requires an out-of-tree patch for unreported time).
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chapters (8)
- 0:00Linux boot time intro
- 2:52Kernel config for speed
- 8:29Bottleneck analysis
- 16:14Driver boot optimizations
- 19:02Userland with systemd
- 28:15Initramfs best practices
- 31:25Boot time tools
- 40:15Real-world benchmarks
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