> I'm following up on all the suggestions regarding Firefox performance > on BTRFS. [ ... ] I haven't read that yet, so maybe I am missing something, but I use Firefox with Btrfs all the time and I haven't got issues. [ ... ] > 1. BTRFS snapshots have proven to be too useful (and too important to > our overall IT approach) to forego. [ ... ] > 3. We have large amounts of storage space (and can add more), but not > enough to break all reflinks on all snapshots. Firefox profiles get fragmented only in the databases containes in them, and they are tiny, as in dozens of MB. That's usually irrelevant. Also nothing forces you to defragment a whole filesystem, you can just defragment individual files or directories by using 'find' with it. My top "$HOME" fragmented files are the aKregator RSS feed databases, usually a few hundred fragments each, and the '.sqlite' files for Firefox. Occasionally like just now I do this: tree$ sudo filefrag .firefox/default/*.sqlite | sort -t: -k 2n | tail -4 .firefox/default/cleanup.sqlite: 43 extents found .firefox/default/content-prefs.sqlite: 67 extents found .firefox/default/formhistory.sqlite: 87 extents found .firefox/default/places.sqlite: 3879 extents found tree$ sudo btrfs fi defrag .firefox/default/*.sqlite tree$ sudo filefrag .firefox/default/*.sqlite | sort -t: -k 2n | tail -4 .firefox/default/webappsstore.sqlite: 1 extent found .firefox/default/favicons.sqlite: 2 extents found .firefox/default/kinto.sqlite: 2 extents found .firefox/default/places.sqlite: 44 extents found > 2. Put $HOME/.cache on a separate BTRFS subvolume that is mounted > nocow -- it will NOT be snapshotted The cache can be simply deleted, and usually files in it are not updated in place, so don't get fragmented, so no worry. Also, you can declare the '.firefox/default/' directory to be NOCOW, and that "just works". I haven't even bothered with that. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
