연세대학교 CAS4101 컴퓨터종합설계 webOS 부팅 최적화

Kernel binary optimized for boot time

• WebOS v2.28
• Built with LD v2.43
• Kernel images included in the repository for reference
  • ./kernel_original = kernel compiled from upstream source
  • ./kernel_optimized = kernel compiled after optimizations applied

Boot time measurement

• Tested on RaspberryPi 4 Model B
• Kernel argument += quiet
• Connected via USB UART serial console
• Power fully disconnected between each trial
• Raspberry Pi cooled with an external fan at all times during the test

Notable improvements

• File size reduction
  • Compressed binary (Image) : 28M -> 24M
  • Uncompressed binary (vmlinux) : 36M -> 34M
• Kernel boot time improvements
  • E(t) : 7.373s -> 7.317s
  • Does not factor speed gains from smaller binary size
    • Current measured data set is not sufficient to assert statistical significance