add Mcast[Snd|Rcv]SocketBuffer clauses to tune multicast socket buffers

1 files changed, 22 insertions, 0 deletions

diff --git a/doc/sync/ftfw/node2/conntrackd.conf b/doc/sync/ftfw/node2/conntrackd.conf
index 59ffc4f..9c26ff5 100644
--- a/doc/sync/ftfw/node2/conntrackd.conf
+++ b/doc/sync/ftfw/node2/conntrackd.conf
@@ -33,6 +33,28 @@ Sync {
 		IPv4_interface 192.168.100.200 # IP of dedicated link
 		Interface eth2
 		Group 3780
+
+		# The multicast sender uses a buffer to enqueue the packets
+		# that are going to be transmitted. The default size of this
+		# socket buffer is available at /proc/sys/net/core/wmem_default.
+		# This value determines the chances to have an overrun in the
+		# sender queue. The overrun results packet loss, thus, losing
+		# state information that would have to be retransmitted. If you
+		# notice some packet loss, you may want to increase the size
+		# of the sender buffer.
+		#
+		# McastSndSocketBuffer 1249280
+		#
+		# The multicast receiver uses a buffer to enqueue the packets
+		# that the socket is pending to handle. The default size of this
+		# socket buffer is available at /proc/sys/net/core/rmem_default.
+		# This value determines the chances to have an overrun in the
+		# receiver queue. The overrun results packet loss, thus, losing
+		# state information that would have to be retransmitted. If you
+		# notice some packet loss, you may want to increase the size of
+		# the receiver buffer.
+		#
+		# McastRcvSocketBuffer 1249280
 	}
 
 	# Enable/Disable message checksumming