Implement write-waits-for-send mode for PseudoTCP and enable it on the host side.

In the new send-confirmation mode the PseudoTCP layer will wait until data
is sent to remote end before completing each write. This significantly 
improves latency for remoting on low bandwidth networks.


Review URL: http://codereview.chromium.org/9791012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@131083 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 7 insertions, 1 deletions

diff --git a/remoting/protocol/libjingle_transport_factory.cc b/remoting/protocol/libjingle_transport_factory.cc
index f80be95..2c16101 100644
--- a/remoting/protocol/libjingle_transport_factory.cc
+++ b/remoting/protocol/libjingle_transport_factory.cc
@@ -9,6 +9,7 @@
 #include "jingle/glue/pseudotcp_adapter.h"
 #include "jingle/glue/utils.h"
 #include "net/base/net_errors.h"
+#include "remoting/base/constants.h"
 #include "remoting/protocol/channel_authenticator.h"
 #include "remoting/protocol/transport_config.h"
 #include "third_party/libjingle/source/talk/base/basicpacketsocketfactory.h"
@@ -184,6 +185,12 @@ void LibjingleStreamTransport::Connect(
   socket_->SetNoDelay(true);
   socket_->SetAckDelay(kTcpAckDelayMilliseconds);
 
+  // TODO(sergeyu): This is a hack to improve latency of the video
+  // channel. Consider removing it once we have better flow control
+  // implemented.
+  if (name_ == kVideoChannelName)
+    socket_->SetWriteWaitsForSend(true);
+
   int result = socket_->Connect(
       base::Bind(&LibjingleStreamTransport::OnTcpConnected,
                  base::Unretained(this)));
@@ -342,6 +349,5 @@ LibjingleTransportFactory::CreateDatagramTransport() {
   return scoped_ptr<DatagramTransport>(NULL);
 }
 
-
 }  // namespace protocol
 }  // namespace remoting