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. Therefore I've started an effort to backport all NFSD commits to those kernels. The backported commits are destined for the official LTS kernel branches so that distributions can easily integrate them into their products. 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 Greg told me this morning that these are now queued for the next LTS 6.1.y release. LTS v5.15.y I have updated this branch to include commits from v6.2.16 through v5.16, all applied to v5.15.150. The fixes include most NFSD and fanotify patches in that range. I've begun testing this series, and so far the backport looks successful. You can find these patches in the "nfsd-5.15.y" branch in the above repo. LTS v5.10.y Backporting is still under way. I've gotten up to v6.0, and plan to continue to v6.2.16. The fixes include most NFSD and fanotify patches in that range, but exclude some because v5.10.y does not include the VFS ID mapping patches that were merged into v5.12. You can find these patches in the "nfsd-5.10.y" branch in the above repo. LTS v5.4.y At this time I am planning not to backport to 5.4.y because of missing features in this kernel. -- Chuck Lever
