Comment by Twirrim

I tried a few times with zstd at various levels of compression with the linux kernel sources. While I've been impressed with zstd, and have some projects lined up to use it, it seems in the case of the linux kernel sources, it's not a great fit. xz handily beats it, and not by a small margin either. I had to really ratchet up the compression levels (20+) before I could get close to 100Mb.