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sctp_{client,server}: disable Nagle by setting sctp_nodelay

The Nagle's algorithm [1] works by combining a number of small outgoing
messages and sending them all at once.  It's enabled by default when
opening a socket.  While it helps to reduce the network congestion by
reducing the number of outgoing packets, it comes at the cost of
increased delay.  Disable it by setting sctp_nodelay to true.

[1] https://en.wikipedia.org/wiki/Nagle%27s_algorithm

Change-Id: I6058a593a617d67d479eea0673d899a5da2d49bf
Related: SYS#7288
---
M src/sctp_client.erl
M src/sctp_server.erl
2 files changed, 2 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/erlang/osmo-s1gw refs/changes/64/39864/1

diff --git a/src/sctp_client.erl b/src/sctp_client.erl
index 5875f61..de3fefb 100644
--- a/src/sctp_client.erl
+++ b/src/sctp_client.erl
@@ -101,6 +101,7 @@
 connect({LocAddr, RemAddr}, Port) ->
     {ok, Sock} = gen_sctp:open([{ip, LocAddr},
                                 {type, seqpacket},
+                                {sctp_nodelay, true},
                                 {active, true}]),
     gen_sctp:connect_init(Sock, RemAddr, Port, []),
     {ok, Sock}.
diff --git a/src/sctp_server.erl b/src/sctp_server.erl
index 27752d8..e9066ac 100644
--- a/src/sctp_server.erl
+++ b/src/sctp_server.erl
@@ -111,6 +111,7 @@
                                 {port, BindPort},
                                 {type, seqpacket},
                                 {reuseaddr, true},
+                                {sctp_nodelay, true},
                                 {active, true}]),
     ?LOG_INFO("SCTP server listening on ~w:~w", [BindAddr, BindPort]),
     ok = gen_sctp:listen(Sock, true),

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