Test the linux operating system

Test the linux operating system-general Linux technology-Linux technology and application information. For details, refer to the following section. I found that the red union rarely mentioned linux-related testing issues. I have many questions about testing. I will discuss them here:
1. I don't know how each linux operating system company tests it. Each small function of a system only uses one use case. There are 3 or 4 hundred use cases in total, if you want to add test cases such as boundary values, it is not only messy, but also requires too much manpower. Is there any better method.
2. About performance testing, How to Write comprehensive and detailed test cases using performance testing tools (such as netperf, lmbench, iozone, and ltp.
3. How to Improve the testing efficiency of linux is not limited to black box testing. If white box testing is required, what capabilities, what work, and how to do it are required.
I can't think of it all of a sudden. I want to come up next time and write it again !!!