As part of redpesk OS development, we were asked to generate some smaller image. This required some investigation about how we can measure the boot time from the first bootloader to the Linux kernel, then by using systemd. In addition, we created some recipes here which will certainly help you to reduce both redpesk OS size and boot time.
This project focuses on optimizing the boot time of Linux systems, including improvements for U-Boot, the Linux kernel, and systemd. It provides recipes and guidelines for reducing boot time, making your system start faster by measuring and optimizing key components of the boot process.
- Measure and analyze boot time using various tools
- Identify bottlenecks in the boot process
- Apply optimizations to reduce the overall boot time
- Document best practices and recipes for Linux kernel, U-Boot, and systemd optimizations
Please note in our usecase, we used the BeagleBoard BeaglePlay as our reference.
The documentation is organized into the following sections:
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Measuring boot time
Learn how to measure boot time accurately using tools likesystemd-analyze,bootchart, anddmesg. Establish a baseline to track improvements. -
Optimize boot time
Implement general optimizations, such as reducing the number of services, running tasks in parallel, and tweaking other system settings to improve boot time. -
Configuring Linux kernel for faster boot
Focus on kernel-specific optimizations, including removing unnecessary modules, enabling initrd, and adjusting kernel parameters for faster boot. -
Optimizing U-Boot and boot strategies
Explore U-Boot optimizations, including reducing delays, adjusting environment variables, and implementing advanced boot strategies likekexecand multi-stage booting. -
Boot time measure: before and after optimization
Track and compare boot times before and after optimization. This section provides a way to measure the impact of optimizations using time logs, charts, and graphs.