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.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu Focal)
Status: New => Incomplete
** Changed in: linux (Ubuntu Jammy)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2022098
Title:
Severe NFS performance degradation after LP #2003053
Status in linux package in Ubuntu:
Incomplete
Status in linux-gke package in Ubuntu:
New
Status in linux source package in Focal:
In Progress
Status in linux-gke source package in Focal:
Fix Committed
Status in linux source package in Jammy:
In Progress
Status in linux-gke source package in Jammy:
Fix Committed
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.
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