dlm: use TCP_NODELAY

Nagling doesn't help and can sometimes hurt dlm comms.

Signed-off-by: David Teigland <teigland@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 1d4e644c6589..2bedb0ac5f92 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -926,6 +926,7 @@ static void tcp_connect_to_sock(struct connection *con)
         struct sockaddr_storage saddr, src_addr;
         int addr_len;
         struct socket *sock = NULL;
+        int one = 1;
 
         if (con->nodeid == 0) {
                 log_print("attempt to connect sock 0 foiled");
@@ -971,6 +972,11 @@ static void tcp_connect_to_sock(struct connection *con)
         make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len);
 
         log_print("connecting to %d", con->nodeid);
+
+        /* Turn off Nagle's algorithm */
+        kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one,
+                          sizeof(one));
+
         result =
                 sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len,
                                    O_NONBLOCK);
@@ -1022,6 +1028,10 @@ static struct socket *tcp_create_listen_sock(struct connection *con,
                 goto create_out;
         }
 
+        /* Turn off Nagle's algorithm */
+        kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one,
+                          sizeof(one));
+
         result = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
                                    (char *)&one, sizeof(one));