On Wed, Jul 8, 2020 at 11:22 AM Dominique Martinet <asmadeus(a)codewreck.org>
Please test, but if a file is deemed not compressible (based on, not
sure what? the first few blocks?) then it will be stored in the
You can check with compsize after the fact if the file had been
compressed or not.
This should be true unless the compress-force mount option is used, even
the chattr is only a hint
OK, this is an interesting piece of information I wasn't aware of. In this
case, if the btrfs heuristics work OK in the majority of cases, the
performance hit might not be there, as I feared. Some thorough
investigation would be needed, though.