[Cluster-devel] [PATCH 6/6] dlm: disable nagle for SCTP

[michaelc@cs.wisc.edu <michaelc@cs.wisc.edu>]

From: Mike Christie <michaelc@cs.wisc.edu>

For TCP we disable Nagle and I cannot think of why it would be needed
for SCTP. When disabled it seems to improve dlm_lock operations like it
does for TCP.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
---
 fs/dlm/lowcomms.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index a4fad32..4f539dd 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -1346,6 +1346,7 @@ static int sctp_listen_for_all(void)
 	int result = -EINVAL, num = 1, i, addr_len;
 	struct connection *con = nodeid2con(0, GFP_NOFS);
 	int bufsize = NEEDED_RMEM;
+	int one = 1;
 
 	if (!con)
 		return -ENOMEM;
@@ -1380,6 +1381,11 @@ static int sctp_listen_for_all(void)
 		goto create_delsock;
 	}
 
+	result = kernel_setsockopt(sock, SOL_SCTP, SCTP_NODELAY, (char *)&one,
+				   sizeof(one));
+	if (result < 0)
+		log_print("Could not set SCTP NODELAY error %d\n", result);
+
 	/* Init con struct */
 	sock->sk->sk_user_data = con;
 	con->sock = sock;
-- 
1.7.1