Public bug reported: I installed ZFS using the 19.10 installer and ran into some severe load caused by /etc/zfs/zed.d/history_event-zfs-list-cacher.sh
Microk8s, due to the way containerd manages container filesystems, causes numerous zevents and can easily overwhelm the above script. I filed a ticket and partial fix to ZOL team, however in response Richard Elling recommended not using that feature. * "it is not core to zfs operation, it is an attempt at optimization that few people know about, and even fewer use" * "zed is allowed to drop events under load, so it might not be called and therefore the cache cannot be authoritative" https://github.com/zfsonlinux/zfs/issues/9584 I'm providing this feedback to you so you can make changes to the Ubuntu installer to not enable this zfs feature. ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: zfs-zed 0.8.1-1ubuntu14 [modified: usr/lib/zfs-linux/zed.d/history_event-zfs-list-cacher.sh] ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7 Uname: Linux 5.3.0-23-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu8.2 Architecture: amd64 CurrentDesktop: GNOME Date: Thu Nov 14 10:51:49 2019 InstallationDate: Installed on 2019-10-31 (13 days ago) InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017) SourcePackage: zfs-linux UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: zfs-linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug eoan -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to zfs-linux in Ubuntu. https://bugs.launchpad.net/bugs/1852608 Title: ZFS Severe Performance issue due to poorly supported feature Status in zfs-linux package in Ubuntu: New Bug description: I installed ZFS using the 19.10 installer and ran into some severe load caused by /etc/zfs/zed.d/history_event-zfs-list-cacher.sh Microk8s, due to the way containerd manages container filesystems, causes numerous zevents and can easily overwhelm the above script. I filed a ticket and partial fix to ZOL team, however in response Richard Elling recommended not using that feature. * "it is not core to zfs operation, it is an attempt at optimization that few people know about, and even fewer use" * "zed is allowed to drop events under load, so it might not be called and therefore the cache cannot be authoritative" https://github.com/zfsonlinux/zfs/issues/9584 I'm providing this feedback to you so you can make changes to the Ubuntu installer to not enable this zfs feature. ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: zfs-zed 0.8.1-1ubuntu14 [modified: usr/lib/zfs-linux/zed.d/history_event-zfs-list-cacher.sh] ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7 Uname: Linux 5.3.0-23-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu8.2 Architecture: amd64 CurrentDesktop: GNOME Date: Thu Nov 14 10:51:49 2019 InstallationDate: Installed on 2019-10-31 (13 days ago) InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017) SourcePackage: zfs-linux UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1852608/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
