Severe NFS performance degradation after LP #2003053
Bug #2022098 reported by
Khaled El Mously
This bug affects 2 people
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Confirmed
|
Undecided
|
Unassigned | ||
Focal |
Fix Released
|
Medium
|
Unassigned | ||
Jammy |
Fix Released
|
Medium
|
Unassigned | ||
linux-gke (Ubuntu) |
Confirmed
|
Critical
|
Khaled El Mously | ||
Focal |
Fix Released
|
Critical
|
Khaled El Mously | ||
Jammy |
Fix Released
|
Critical
|
Khaled El Mously |
Bug Description
The fix to LP #2003053 has caused massively increased NFS server access in some use-cases, which caused severe performance degradation to the point of being unusable in some cases.
The solution to this issue, at least temporarily and at least for linux-gke, is to make the new behaviour optional using the "nfs_fasc=1" module parameter. Without this parameter specified, (or specified as =0) will keep the old behaviour.
Regresion potential:
- Regression potential is considered low considering the scope of the change and is limited to NFS only.
no longer affects: | linux (Ubuntu) |
Changed in linux-gke (Ubuntu): | |
assignee: | nobody → Khaled El Mously (kmously) |
Changed in linux-gke (Ubuntu Focal): | |
assignee: | nobody → Khaled El Mously (kmously) |
Changed in linux-gke (Ubuntu Jammy): | |
assignee: | nobody → Khaled El Mously (kmously) |
Changed in linux-gke (Ubuntu): | |
importance: | Undecided → Critical |
Changed in linux-gke (Ubuntu Focal): | |
importance: | Undecided → Critical |
Changed in linux-gke (Ubuntu Jammy): | |
importance: | Undecided → Critical |
description: | updated |
description: | updated |
Changed in linux-gke (Ubuntu Focal): | |
status: | New → Fix Committed |
Changed in linux-gke (Ubuntu Jammy): | |
status: | New → Fix Committed |
Changed in linux (Ubuntu Focal): | |
importance: | Undecided → Critical |
Changed in linux (Ubuntu Jammy): | |
importance: | Undecided → Critical |
status: | Incomplete → In Progress |
Changed in linux (Ubuntu Focal): | |
status: | Incomplete → In Progress |
Changed in linux (Ubuntu Jammy): | |
importance: | Critical → Medium |
Changed in linux (Ubuntu Focal): | |
importance: | Critical → Medium |
Changed in linux (Ubuntu Jammy): | |
status: | In Progress → Fix Committed |
Changed in linux (Ubuntu Focal): | |
status: | In Progress → Fix Committed |
tags: |
added: verification-done-focal verification-done-jammy removed: verification-needed-focal verification-needed-jammy |
Changed in linux (Ubuntu): | |
status: | Incomplete → Confirmed |
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This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 2022098
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.