- NFS is slow for one user on a host that has both
sec=krb5mounts. The kernel only gets into the state after some time with the user using a sec=krb5 NFS mountpoint. Once the kernel is in this state, the mount point with
sec=sysis also affected. I don't think that
sec=sysmountpoints alone trigger this behaviour.
- The definition of
NFS is slowmeans NFS mounts have WRITEs capped at
PAGE_SIZEbytes/op (4KB on x86_64) even though
wsizeis much larger - only a reboot fixes the problem.
- We did not experience this issue prior to upgrading to 2.6.32-504.*el6 kernels
- Red Hat Enterprise Linux 6 (NFS client)
- kernel 2.6.32-489.el6 or above
- kernel prior to kernel-2.6.32-642.6.1.el6
- kernel prior to kernel-2.6.32-696.el6
- Red Hat Enterprise Linux 7 (NFS client)
- kernel earlier than kernel-3.10.0-514.2.2.el7
- kernel earlier than kernel-3.10.0-327.46.1.el7
- NFS mounts with mixed security flavors, some mounts have
sec=krb5and others have
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