Fedora Developers Evaluating Compression Options For Btrfs-By-Default Proposal

[skeevy420]

BTRFS does the same per file, zstd can skip in-compressible data automatically. And the heuristic is pretty fast, more than 1GB/s per thread. To the point you have `compress` and `compress-force`

I wish I could remember where I read this, but with BTRFS+Zstd you want to exclusively use "compress-force" because "compress" will use the kernel's built-in heuristic to skip files where as "compress-force" will use Zstd's faster heuristic.

[RomuloP]

I wish I could remember where I read this, but with BTRFS+Zstd you want to exclusively use "compress-force" because "compress" will use the kernel's built-in heuristic to skip files where as "compress-force" will use Zstd's faster heuristic.

In fact kernel heuristic was fast but poor. I'm not sure this is a problem since kernel 4.15. Kernel heuristic nowadays is quite sophisticated and probably as fast according to btrfs wiki, only bench-marking to be sure it is worth it.