What are the two important parameters of Linux system performance optimization?

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The code is as follows:

Vfs_cache_pressure:

This file indicates the kernel's tendency to recycle memory for directory and inode cache; the default value of 100 indicates that the kernel will keep directory and inode cache at a reasonable percentage based on pagecache and swapcache; lowering this value below 100 will cause the kernel to tend to retain directory and inode cache; by more than 100, which will cause the kernel to tend to recycle directory and inode cache.

Default: 100

The code is as follows:

Min_free_kbytes:

This file represents the minimum amount of free memory (Kbytes) that forces Linux VM to reserve.

Default: 724 (512m physical memory)

Change the command:

The code is as follows:

Sysctl-w vm.vfs_cache_pressure=200

Sysctl-w vm.min_free_kbytes=1024

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