On Wed, Dec 23, 2020 at 01:47:33AM +0100, Matteo Croce wrote: > As an extra test I extracted the archive with data=ordered, remounted > with data=writeback and timed the rm -rf and viceversa. > The mount option is the one that counts, the one using during > extraction doesn't matter. Hmm... that's really surprising. At this point, the only thing I can suggest is to try using blktrace to see what's going on at the block layer when the I/O's and discard requests are being submitted. If there are no dirty blocks in the page cache, I don't see how data=ordered vs data=writeback would make a difference to how mount -o discard processing would take place. Cheers, - Ted
