I believe this bug is due to a change that causes files on a dax volume to be allocated as sparse files, so that every write to a new allocation unit causes another physical allocation. The previous behavior was to allocate the whole file up to the allocated size as one operation.
This is just by observing the behavior and running experiments to try to figure it out. I haven't looked at the code. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1848212 Title: Optane PM access times are much longer than they should be To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1848212/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
