tcp: Make CUBIC the default congestion control algorithm

CHANGES.html

@@ -66,7 +66,7 @@ us a note on ns-developers mailing list.</p>
 </ul>
 <h2>Changed behavior:</h2>
 <ul>
-<li></li>
+<li>The default <b>TCP congestion control</b> has been changed from NewReno to CUBIC.</li>
 </ul>
 
 <hr>

examples/tcp/tcp-pacing.cc

@@ -148,7 +148,7 @@ main (int argc, char *argv[])
   bool tracing = false;
 
   uint32_t maxBytes = 0; // value of zero corresponds to unlimited send
-  std::string transportProtocol = "ns3::TcpNewReno";
+  std::string transportProtocol = "ns3::TcpCubic";
 
   Time simulationEndTime = Seconds (5);
   DataRate bottleneckBandwidth ("10Mbps");  // value of x as shown in the above network topology

src/internet/doc/tcp.rst

@@ -48,7 +48,7 @@ ns-3 TCP
 
 In brief, the native |ns3| TCP model supports a full bidirectional TCP with
 connection setup and close logic. Several congestion control algorithms
-are supported, with NewReno the default, and CUBIC, Westwood, Hybla, HighSpeed,
+are supported, with CUBIC the default, and NewReno, Westwood, Hybla, HighSpeed,
 Vegas, Scalable, Veno, Binary Increase Congestion Control (BIC), Yet Another
 HighSpeed TCP (YeAH), Illinois, H-TCP, Low Extra Delay Background Transport
 (LEDBAT), TCP Low Priority (TCP-LP) and and Data Center TCP (DCTCP) also supported. The model also supports
@@ -89,6 +89,9 @@ In the ns-3.32 release, the default recovery algorithm was set to
 Proportional Rate Reduction (PRR) from the classic ack-clocked Fast
 Recovery algorithm.
 
+In the ns-3.34 release, the default congestion control algorithm was set
+to CUBIC from NewReno.
+
 Acknowledgments
 +++++++++++++++
 

src/internet/model/tcp-l4-protocol.cc

@@ -42,6 +42,7 @@
 #include "tcp-socket-factory-impl.h"
 #include "tcp-socket-base.h"
 #include "tcp-congestion-ops.h"
+#include "tcp-cubic.h"
 #include "tcp-recovery-ops.h"
 #include "tcp-prr-recovery.h"
 #include "rtt-estimator.h"
@@ -79,7 +80,7 @@ TcpL4Protocol::GetTypeId (void)
                    MakeTypeIdChecker ())
     .AddAttribute ("SocketType",
                    "Socket type of TCP objects.",
-                   TypeIdValue (TcpNewReno::GetTypeId ()),
+                   TypeIdValue (TcpCubic::GetTypeId ()),
                    MakeTypeIdAccessor (&TcpL4Protocol::m_congestionTypeId),
                    MakeTypeIdChecker ())
     .AddAttribute ("RecoveryType",