Hi! I'd like to recommend another improvement: let's make the installer default to noatime for fstab it creates.
In the past, atime updates used to ruin performance. Thanks to work by Ted Ts'o and others, that penalty has been greatly reduced (but not eliminated) by two options: * relatime (on by default): atime is not updated unless atime<=mtime or atime<NOW-24h * lazytime (off by default): atime and mtime updates are postponed by up to 30 minutes, unless there's memory pressure or the inode has to be written for another reason But alas, there are more considerations than just performance: * atime is really nasty for any CoW filesystems (btrfs, zfs, lvm snapshots, qcow2 snapshots, deduped thin storage, etc). For a /usr-y mix of files, it costs around 5% of disk space per snapshot. relatime offers no help as its threshold (24h) just happens to match the most popular snapshot and cronjob frequency (once per day). Even worse, it can make _reading_ things result in ENOSPC! * atime murders media with sharply limited write endurance, such as SD cards. For this reason, every SoC pre-made image I've seen ships with noatime. And what do we get in return? * the "vote" field in popcon. This somewhat benefits the distribution (lets us spot low-use packages installed by default, such as xterm (53.60% inst, 6.67% vote) or tcpd (95.20% inst, 9.85% vote)) but gives no gain to individual users. * some rare forensic uses * new mail notification on login The last thing has recentlish (POSIX-2008) gained a solution: mail readers can be patched to manually calls futimens(f, {UTIME_NOW, UTIME_OMIT}); stretch/ascii already sports mutt patched this way -- not sure what other mail clients are likely to be used by local users thus worthy of patching. Sample patch: https://github.com/neomutt/neomutt/commit/816095bfdb72caafd8845e8fb28cbc8c6afc114f Because of stretch's freeze, I did not manage to write+push upstream patches for any client other than mutt, I guess it's time to resume. Obviously, an admin who thinks he actually has an use for atime is free to edit fstab. So, what would you folks say about defaulting to noatime? Meow! -- ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢰⠒⠀⣿⡁ Vat kind uf sufficiently advanced technology iz dis!? ⢿⡄⠘⠷⠚⠋⠀ -- Genghis Ht'rok'din ⠈⠳⣄⠀⠀⠀⠀ _______________________________________________ Dng mailing list Dng@lists.dyne.org https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng