Increase flow control receive window of quic_client_bin.cc, by adding a

net/tools/quic/quic_client_bin.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A binary wrapper for QuicClient.
 // Connects to a host using QUIC, and sends requests to the provided URLS.
 //
 // Example usage:
 //  quic_client --address=127.0.0.1 --port=6122 --hostname=www.google.com
 //      http://www.google.com/index.html http://www.google.com/favicon.ico
@@ skipping 14 matching lines @@
 std::string FLAGS_address = "127.0.0.1";
 // The IP or hostname the quic client will connect to.
 std::string FLAGS_hostname = "localhost";
 // The port the quic client will connect to.
 int32 FLAGS_port = 6121;
 // Check the certificates using proof verifier.
 bool FLAGS_secure = false;
 // QUIC version to speak, e.g. 21. Default value of 0 means 'use the latest
 // version'.
 int32 FLAGS_quic_version = 0;
+// Size of flow control receive window to advertize to the peer.
+int32 FLAGS_flow_control_window_bytes = 10 * 1024 * 1024;  // 10 Mb
 
 int main(int argc, char *argv[]) {
   base::CommandLine::Init(argc, argv);
   base::CommandLine* line = base::CommandLine::ForCurrentProcess();
   const base::CommandLine::StringVector& urls = line->GetArgs();
 
   logging::LoggingSettings settings;
   settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
   CHECK(logging::InitLogging(settings));
 
   if (line->HasSwitch("h") || line->HasSwitch("help") || urls.empty()) {
     const char* help_str =
         "Usage: quic_client [options] <url> ...\n"
         "\n"
         "At least one <url> with scheme must be provided "
         "(e.g. http://www.google.com/)\n\n"
         "Options:\n"
         "-h, --help                  show this help message and exit\n"
         "--port=<port>               specify the port to connect to\n"
         "--address=<address>         specify the IP address to connect to\n"
         "--host=<host>               specify the SNI hostname to use\n"
         "--secure                    check certificates\n"
-        "--quic-version=<quic version> specify QUIC version to speak\n";
+        "--quic-version=<quic version> specify QUIC version to speak\n"
+        "--flow-control-window-bytes=<bytes> specify size of flow control "
+        "receive window to advertize to the peer\n";
     std::cout << help_str;
     exit(0);
   }
   if (line->HasSwitch("port")) {
     int port;
     if (base::StringToInt(line->GetSwitchValueASCII("port"), &port)) {
       FLAGS_port = port;
     }
   }
   if (line->HasSwitch("address")) {
     FLAGS_address = line->GetSwitchValueASCII("address");
   }
   if (line->HasSwitch("hostname")) {
     FLAGS_hostname = line->GetSwitchValueASCII("hostname");
   }
   if (line->HasSwitch("secure")) {
     FLAGS_secure = true;
   }
   if (line->HasSwitch("quic-version")) {
     int quic_version;
     if (base::StringToInt(line->GetSwitchValueASCII("quic-version"),
                           &quic_version)) {
       FLAGS_quic_version = quic_version;
     }
   }
+  if (line->HasSwitch("flow-control-window-bytes")) {
+    int flow_control_window_bytes;
+    if (base::StringToInt(
+            line->GetSwitchValueASCII("flow-control-window-bytes"),
+            &flow_control_window_bytes)) {
+      FLAGS_flow_control_window_bytes = flow_control_window_bytes;
+    }
+  }
   VLOG(1) << "server port: " << FLAGS_port
           << " address: " << FLAGS_address
           << " hostname: " << FLAGS_hostname
           << " secure: " << FLAGS_secure
           << " quic-version: " << FLAGS_quic_version;
 
   base::AtExitManager exit_manager;
 
   // Determine IP address to connect to from supplied hostname.
   net::IPAddressNumber addr;
   CHECK(net::ParseIPLiteralToNumber(FLAGS_address, &addr));
 
   // Populate version vector with all versions if none specified.
   net::QuicVersionVector versions;
   if (FLAGS_quic_version == 0) {
     versions = net::QuicSupportedVersions();
   } else {
     versions.push_back(static_cast<net::QuicVersion>(FLAGS_quic_version));
   }
 
   // Build the client, and try to connect.
   VLOG(1) << "Conecting to " << FLAGS_hostname << ":" << FLAGS_port
           << " with supported versions "
           << QuicVersionVectorToString(versions);
   net::EpollServer epoll_server;
   net::QuicConfig config;
   config.SetDefaults();
 
+  // The default flow control window of 16 Kb is too small for practical
+  // purposes. Set it to the specified value, which has a large default.
+  config.SetInitialFlowControlWindowToSend(
+      FLAGS_flow_control_window_bytes);
+  config.SetInitialStreamFlowControlWindowToSend(
+      FLAGS_flow_control_window_bytes);
+  config.SetInitialSessionFlowControlWindowToSend(
+      FLAGS_flow_control_window_bytes);
+
   net::tools::QuicClient client(
       net::IPEndPoint(addr, FLAGS_port),
       net::QuicServerId(FLAGS_hostname, FLAGS_port, FLAGS_secure,
                         net::PRIVACY_MODE_DISABLED),
       versions, true, config, &epoll_server);
 
   client.Initialize();
 
   if (!client.Connect()) {
     LOG(ERROR) << "Client failed to connect to host: "
                << FLAGS_hostname << ":" << FLAGS_port;
     return 1;
   }
 
   // Send a GET request for each supplied url.
   client.SendRequestsAndWaitForResponse(urls);
   return 0;
 }