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 The v6.1.82 kernel has been updated. This part of the project is complete. LTS v5.15.y A first attempt at merging these patches into v5.15.y was NAK'd due to some SCSI changes made on behalf of patches to NFSD's pNFS block layout implementation. The series has been reworked and retested. You can find these patches in the "nfsd-5.15.y" branch in the above repo. LTS v5.10.y This branch will need the same reworking as nfsd-5.15.y. I will start work on that once the v5.15.y work is complete. You can find these patches in the "nfsd-5.10.y" branch in the above repo. -- Chuck Lever
