nfsstat returns null values for nfsv4 server operations

[Charland, Denis]

The command nfsstat returns null values for nfsv4 server operations. Here's the nfs4 portion of 
the output from nfsstat on my NFS server:

Server nfs v4:
null         compound     
8         0% 246798357 99% 

Server nfs v4 operations:
op0-unused   op1-unused   op2-future   access       close        commit       
0         0% 0         0% 0         0% 0         0% 0         0% 0         0% 
create       delegpurge   delegreturn  getattr      getfh        link         
0         0% 0         0% 0         0% 0         0% 0         0% 0         0% 
lock         lockt        locku        lookup       lookup_root  nverify      
0         0% 0         0% 0         0% 0         0% 0         0% 0         0% 
open         openattr     open_conf    open_dgrd    putfh        putpubfh     
0         0% 0         0% 0         0% 0         0% 0         0% 0         0% 
putrootfh    read         readdir      readlink     remove       rename       
0         0% 0         0% 0         0% 0         0% 0         0% 0         0% 
renew        restorefh    savefh       secinfo      setattr      setcltid     
0         0% 0         0% 0         0% 0         0% 0         0% 0         0% 
setcltidconf verify       write        rellockowner 
0         0% 0         0% 0         0% 0         0% 

This information comes from /proc/net/rpc/nfsd. Here's the content of this file on my NFS server:

rc 0 0 246745008
fh 22974 0 0 0 0
io 4318535 3332935224
th 8 649128 5542.600 3498.528 1929.384 0.000 832.492 348.892 182.376 74.996 0.000 25.332
ra 16 1194 0 2 0 0 0 0 0 0 0 129
net 246821717 0 246829847 824
rpc 246799988 9 0 9 0
proc2 18 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
proc3 22 1 1969 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
proc4 2 8 246798357

Why does nfs4 (proc4) have less information than nfs3 (proc3)?

I'm using nfs-utils-1.0.9-8 and running kernel 2.6.17 on FC4. I have about 50 nfs4 clients.
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