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
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