kNFSd - 2 of 4 - SVC sockets don't disable Nagle

I noticed that the Nagle algorithm was disabled just recently on the client side, while it still seems to be enabled on the server side. The previous patch came from Chuck Lever.

Below patch disables it on the server side as well. For latency reasons, this should be the desired behaviour NFS at both client and server.

diff ./net/sunrpc/svcsock.c~current~ ./net/sunrpc/svcsock.c
@@ -936,6 +936,7 @@ static int
 svc_tcp_init(struct svc_sock *svsk)
 {
 	struct sock	*sk = svsk->sk_sk;
+	struct tcp_opt  *tp = &(sk->tp_pinfo.af_tcp);
 
 	svsk->sk_recvfrom = svc_tcp_recvfrom;
 	svsk->sk_sendto = svc_tcp_sendto;

@@ -952,6 +953,8 @@ svc_tcp_init(struct svc_sock *svsk)
 		svsk->sk_reclen = 0;
 		svsk->sk_tcplen = 0;
 
+		tp->nonagle = 1;        /* disable Nagle's algorithm */
+
 		/* initialise setting must have enough space to
 		 * receive and respond to one request.  
 		 * svc_tcp_recvfrom will re-adjust if necessary

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