D10991.diff
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	Index: head/sys/fs/nfs/nfsproto.h
	===================================================================
	--- head/sys/fs/nfs/nfsproto.h
	+++ head/sys/fs/nfs/nfsproto.h
	@@ -56,8 +56,22 @@
	#define NFS_MAXDGRAMDATA 16384
	#define NFS_MAXPATHLEN 1024
	#define NFS_MAXNAMLEN 255
	+/*
	+ * Calculating the maximum XDR overhead for an NFS RPC isn't easy.
	+ * NFS_MAXPKTHDR is antiquated and assumes AUTH_SYS over UDP.
	+ * NFS_MAXXDR should be sufficient for all NFS versions over TCP.
	+ * It includes:
	+ * - Maximum RPC message header. It can include 2 400byte authenticators plus
	+ * a machine name of unlimited length, although it is usually relatively
	+ * small.
	+ * - XDR overheads for the NFSv4 compound. This can include Owner and
	+ * Owner_group strings, which are usually fairly small, but are allowed
	+ * to be up to 1024 bytes each.
	+ * 4096 is overkill, but should always be sufficient.
	+ */
	#define NFS_MAXPKTHDR 404
	-#define NFS_MAXPACKET (NFS_SRVMAXIO + 2048)
	+#define NFS_MAXXDR 4096
	+#define NFS_MAXPACKET (NFS_SRVMAXIO + NFS_MAXXDR)
	#define NFS_MINPACKET 20
	#define NFS_FABLKSIZE 512 /* Size in bytes of a block wrt fa_blocks */
	#define NFSV4_MINORVERSION 0 /* V4 Minor version */