It's apparent that a number of distributions and their customers remain on long-term stable kernels. We are aware of the scalability problems and other bugs in NFSD in kernels between v5.4 and v6.1. To address the filecache and other scalability problems in those kernels, I'm preparing backported patches of NFSD fixes for several popular LTS kernels. These backports are destined for the official LTS kernel branches so that distributions can easily integrate them into their products. Once this effort is complete, Greg and Sasha will continue to be responsible for backporting NFSD-related fixes from upstream into the LTS kernels. Here's a status update. --- I've pushed the NFSD backports to branches in this repo: https://git.kernel.org/pub/scm/linux/kernel/git/cel/linux.git If you are able, I encourage you to pull these, review them or try them out, and report any issues or successes. I'm currently using the NFS workflows in kdevops as the testing platform, but am planning to include other tests. LTS v5.15.y Work on backporting the NFSD file cache fixes to v5.15.y is now complete. Subsequent fixes and changes will go through the usual -> stable@ process. LTS v5.10.y I've updated nfsd-5.10.y to include the patches and fixes that were included in nfsd-5.15.y. You can find these patches in the "nfsd-5.10.y" branch in the above repo. This week I intend to set up CI testing for this branch. -- Chuck Lever
