[Bug 289711] NFS4 access is very slow - "Request couldn't be completed in time"

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289711

--- Comment #9 from Rick Macklem <[email protected]> ---
(In reply to Peter Much from comment #8)
Well, the packet trace is interesting...
Just before the Rename that gets NFS4ERR_DELAY
as a reply, the client does a recovery for some
reason.

At packet#893453 it does an ExchangeID, etc.
which is what normally happens when a server
reboots.

But the server does not appear to have rebooted?

The client no longer has a delegation (or you might
say it doesn't think it has a delegation), but the
server does think it has a delegation, which causes
the long delay related to the Rename.

The workaround is to disable delegations, but it
would be nice to know what triggers the client
to do this recovery. I'll look at it some more,
to try and figure that out.
(It gets a NFS4ERR_BAD_STATEID from the server,
but I didn't think that would trigger it?)

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