There's one known problem with the NFS related code that's in that 4.3
patch -- apply this AFTER you apply
http://www.cs.duke.edu/~gallatin/4.3-zero-copy.diff

--- sys/nfs/nfs_serv.c  Fri May 18 10:23:01 2001
+++ /usr/project/ari_scratch2/rajiv/src/sys/nfs/nfs_serv.c      Mon
Jul 16 17:13:28 2001
@@ -1099,6 +1099,7 @@
                        error = 0;
 
                        nfs_serv_zcreadyes++;
+                       if(vp) vrele(vp); /* Drew's fix to spaceleak*/
                        if (0) {
                        errorpath:
                                if (mb->m_next != NULL) {