This bug is awaiting verification that the linux-mtk/5.15.0-1030.34
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-jammy-linux-mtk' to 'verification-done-jammy-
linux-mtk'. If the problem still exists, change the tag 'verification-
needed-jammy-linux-mtk' to 'verification-failed-jammy-linux-mtk'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-jammy-linux-mtk-v2 
verification-needed-jammy-linux-mtk

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-gke in Ubuntu.
https://bugs.launchpad.net/bugs/2022098

Title:
  Severe NFS performance degradation after LP #2003053

Status in linux package in Ubuntu:
  Confirmed
Status in linux-gke package in Ubuntu:
  Confirmed
Status in linux source package in Focal:
  Fix Released
Status in linux-gke source package in Focal:
  Fix Released
Status in linux source package in Jammy:
  Fix Released
Status in linux-gke source package in Jammy:
  Fix Released

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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