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Comment by everdrive | Hacker News Reader

I tried it with BTRFS and had really terrible performance. I ended up trying ext4 and it was not appreciably better. I don't know the make and model of my SSD, but I'm sure it's a not-very-impressive SSD. Unencrypted with EXT4 was the only thing that offered good performance.

Mind you, I'm really happy with CachyOS, but I don't really understand why this is a problem and it doesn't seem to be an issue others are having.

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Maybe this is something you have already checked but first get your device with blkid or whatever you prefer, then

    sudo smartctl -x /dev/nvmeXXXX

Look at the temperature when you are pushing the IO really hard. Some devices will throttle when hot.

Is this on a laptop? Do you have any indoor pets that have fur? Yaks shed a lot this time of year.

I'll check that out. In my case I had moved straight from Fedora and was using LUKS + EXT4 -- with no issues whatsoever. Further, rather than losing some write speed, my system will actually hang quite aggressively. It seems to be CPU-related, but perhaps it's disk reads that are hanging? (or maybe both) My PC case is also not extra-hairy :)

To benchmark the encryption if you suspect CPU related, try

    cryptsetup benchmark

though it's more useful if it was run prior on your previous OS installation. For storage, fio [1] may be useful but that is a much more involved topic and having baseline tests run in your former OS that you said worked fine.

[1] - https://fio.readthedocs.io/en/latest/fio_doc.html

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