Public bug reported: There are two btrfs related patches available for kernel 4.8 which improve latency and solve problems with low free disk space:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ba929b6646c5b87c7bb15cd8d3e51617725c983b https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d58b0d980f0b1c27204da0e05537b606da45a07f Seen at (german source): http://www.heise.de/ct/artikel/Die-Neuerungen- von-Linux-4-8-3283402.html >From my side, I encountered problems with full disks in btrfs multiple times. I reported some of them in the past. Plus do I have another system with 2x3TB of disk space (WD HDDs), while btrfs sits on top of a dm-raid and LUKS crypto. I experience very slow disk I/O on that system while disk usage gets fuller and fuller (combined with lots of subvolumes and layered devices, so that could be another reason). That said, I guess that, according to the article at heise and commit messages, the two patches have a tremendous impact on performance. Plus, should the patches fix some of the problems that happen together with full disks ("ENOSPC" issues). Now that the patches make it into the upstream kernel, I think that the developers have had some reason to do so. For the moment, I can't test if it actually improves something for me. Would still be great to have these patches backported to - ubuntu 16.04 Kernel 4.4 - ubuntu 14.04 LTS Kernel 4.4 ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-36-generic 4.4.0-36.55 ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16 Uname: Linux 4.4.0-36-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: thomas 4788 F.... pulseaudio CurrentDesktop: GNOME-Flashback:Unity Date: Sun Sep 11 07:39:13 2016 HibernationDevice: RESUME=UUID=28eded29-f9e6-44b5-9e54-c4dd60c8e3cd InstallationDate: Installed on 2014-11-29 (652 days ago) InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) MachineType: Dell Inc. Latitude E5510 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.4.0-36-generic root=UUID=6408c2d9-1b60-43d7-9a7f-2dceeb40de28 ro rootflags=subvol=@ quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-36-generic N/A linux-backports-modules-4.4.0-36-generic N/A linux-firmware 1.157.3 SourcePackage: linux UpgradeStatus: Upgraded to xenial on 2016-06-15 (87 days ago) dmi.bios.date: 12/06/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A16 dmi.board.name: 023HKR dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA16:bd12/06/2013:svnDellInc.:pnLatitudeE5510:pvr0001:rvnDellInc.:rn023HKR:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E5510 dmi.product.version: 0001 dmi.sys.vendor: Dell Inc. ** Affects: linux (Ubuntu) Importance: Undecided Status: Confirmed ** Tags: amd64 apport-bug xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1622291 Title: Backport btrfs enospc rework (from kernel 4.8) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1622291/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
