[Bug 219645] max NFS I/O size is not tunable

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219645

            Bug ID: 219645
           Summary: max NFS I/O size is not tunable
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: rmacklem at FreeBSD.org

Created attachment 183045
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183045&action=edit
make max NFS client I/O size tunable

The maximum size of an I/O operation done by the NFS client is the
largest buffer cache block size (MAXBCACHEBUF).
This can only be changed by recompiling the kernel.

This patch make it a tunable called vfs.maxbcachebuf and tweaks the
NFS client to use this size for nm_rsize/nm_wsize by default.

It also generates a console log message if kern.ipc.maxsockbuf needs
to be increased.

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