On Mon, 2020-12-21 at 12:48 -0500, Colin Walters wrote: > > On Mon, Dec 21, 2020, at 11:28 AM, Ben Cotton wrote: > > > > > > == Summary == > > > > RPM Copy on Write provides a better experience for Fedora Users as > > it > > reduces the amount of I/O and offsets CPU cost of package > > decompression. RPM Copy on Write uses reflinking capabilities in > > btrfs, which is the default filesystem in Fedora 33. > > A bunch of points here: > > - No, it's the default for one Edition. Others don't default to > it. And even for Workstation we can't *require* it because it's > definitely supported to use other filesystems and storage layouts. > > - Orthogonal to this, I'd also note that xfs supports reflinks too. > > Combining those I'd say instead e.g.: "Most Fedora Editions default > to a filesystem that support reflinks, e.g. btrfs or xfs" (actually I > think IoT defaults to ext4 for...probably they didn't consider it?)
Thanks for surfacing this, we'll make the language clearer. About XFS: it should work, but we haven't tested it extensively, and this work has been developed primarily with btrfs in mind. > - When talking about RPMs we need to think about container images, > which use overlayfs by default, which defers to the underlying > filesystem for reflinks - so should be fine, but should be explicitly > written down (and tested) If reflinking isn't possible (which can also happen if e.g. the package cache and the system are on different filesystems) things work as normal, albeit with a performance penalty (because more I/O is required to install the package). I'll let Matthew weigh in on the other points you raised. Thanks for the feedback! Cheers Davide _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org
