Commit 123ff122 authored Feb 05, 2014 by Lars Ellenberg Committed by Philipp Reisner Jul 10, 2014

drbd: trigger tcp_push_pending_frames() for PING and PING_ACK



This should reduce latency for such in-DRBD-protocol "pings",
and may help reduce spurious disconnect/reconnect cycles due to
 "PingAck did not arrive in time."

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

parent 66ce6dbc

drivers/block/drbd/drbd_main.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -662,6 +662,11 @@ static int __send_command(struct drbd_connection *connection, int vnr,
		msg_flags);
		if (data && !err)
		err = drbd_send_all(connection, sock->socket, data, size, 0);
		/* DRBD protocol "pings" are latency critical.
		* This is supposed to trigger tcp_push_pending_frames() */
		if (!err && (cmd == P_PING \|\| cmd == P_PING_ACK))
		drbd_tcp_nodelay(sock->socket);

		return err;
		}