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. The backported commits 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 v6.1.y Patches that bring NFSD in linux-6.1.y up to v6.1.16 have been merged into v6.1.81. I've identified a few additional filecache related fixes that I will forward to Greg and Sasha soon. LTS v5.15.y I have updated this branch to include commits from v6.2.16 through v5.16, all applied to v5.15.151. Testing has stopped while I work on the v6.9 merge window. You can find these patches in the "nfsd-5.15.y" branch in the above repo. LTS v5.10.y I have updated this branch to include commits from v6.2.16 through v5.11, all applied to v5.10.212. Testing has stopped while I work on the v6.9 merge window. You can find these patches in the "nfsd-5.10.y" branch in the above repo. -- Chuck Lever
