Hey y'all - As a datapoint, I *don't* see this issue on 5.17.4-200.fc35.x86_64. Hosts are Fedora 35 server, with 17.2.0. Happy to test or provide more data from this cluster if it would be helpful. -Alex On May 11, 2022, 2:02 PM -0400, David Rivera <rivera.david87@xxxxxxxxx>, wrote: > Hi, > > My experience is similar, I was also using elrepo kernels on CentOS 8. > Kernels 5.14+ were causing problems, I had to go back to 5.11. I did not > test 5.12-5.13. I did not have enough time to narrow down the system > instability to Ceph. Currently, I'm using the included Rocky Linux 8 > kernels (4.18); I very rarely get caps release warnings but besides that > everything has been working great. > > David > > > On Wed, May 11, 2022, 09:07 Stefan Kooman <stefan@xxxxxx> wrote: > > > Hi List, > > > > We have quite a few linux kernel clients for CephFS. One of our > > customers has been running mainline kernels (CentOS 7 elrepo) for the > > past two years. They started out with 3.x kernels (default CentOS 7), > > but upgraded to mainline when those kernels would frequently generate > > MDS warnings like "failing to respond to capability release". That > > worked fine until 5.14 kernel. 5.14 and up would use a lot of CPU and > > *way* more bandwidth on CephFS than older kernels (order of magnitude). > > After the MDS was upgraded from Nautilus to Octopus that behavior is > > gone (comparable CPU / bandwidth usage as older kernels). However, the > > newer kernels are now the ones that give "failing to respond to > > capability release", and worse, clients get evicted (unresponsive as far > > as the MDS is concerned). Even the latest 5.17 kernels have that. No > > difference is observed between using messenger v1 or v2. MDS version is > > 15.2.16. > > Surprisingly the latest stable kernels from CentOS 7 work flawlessly > > now. Although that is good news, newer operating systems come with newer > > kernels. > > > > Does anyone else observe the same behavior with newish kernel clients? > > > > Gr. Stefan > > > > _______________________________________________ > > ceph-users mailing list -- ceph-users@xxxxxxx > > To unsubscribe send an email to ceph-users-leave@xxxxxxx > > > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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