Public bug reported: When activating the autotrim feature on any ZFS version starting from 2.2.0 this will lead to a permanent increase of the load average (as diplayed in top) due to an uninterruptible vdev_autotrim thread for each vdev capable of TRIM.
This issue has been reported (https://github.com/openzfs/zfs/issues/15453) as well as fixed (https://github.com/openzfs/zfs/pull/15781) upstream but the fix is not yet backported to Ubuntu. Since this bug was introduced with version 2.2.0 both mantic as well as noble are affected. How to reproduce: 1. Create a pool with at least one TRIM-capable device 2. run "zpool set autotrim=on <pool>" 3. watch the output of "top" or "runtime" and see how the load average increases permanently even when the system is idle by one per vdev 4. running "ps aux | grep -w D" will show the broken threads: [root@test ~]# ps aux | grep -w D\< root 7193 0.0 0.0 0 0 ? D< 13:07 0:00 [vdev_autotrim] ** Affects: zfs-linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2057693 Title: Activating autotrim results in high load average due to uninterruptible threads To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/2057693/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
