** Changed in: zfs-linux (Ubuntu)
Assignee: (unassigned) => Heitor Alves de Siqueira (halves)
** Changed in: zfs-linux (Ubuntu)
Status: Confirmed => In Progress
** Changed in: zfs-linux (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/2057693
Title:
Activating autotrim results in high load average due to
uninterruptible threads
Status in Native ZFS for Linux:
Fix Released
Status in zfs-linux package in Ubuntu:
In Progress
Bug description:
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]
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