Remove stats for recording reno vs cubic mode in internal server's varz.

net/quic/congestion_control/cubic_test.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.
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "net/quic/congestion_control/cubic.h"
 #include "net/quic/quic_connection_stats.h"
 #include "net/quic/test_tools/mock_clock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
 namespace test {
 
 const float kBeta = 0.7f;  // Default Cubic backoff factor.
 const uint32 kNumConnections = 2;
 const float kNConnectionBeta = (kNumConnections - 1 + kBeta) / kNumConnections;
 const float kNConnectionAlpha = 3 * kNumConnections * kNumConnections *
       (1 - kNConnectionBeta) / (1 + kNConnectionBeta);
 
 class CubicTest : public ::testing::Test {
  protected:
   CubicTest()
       : one_ms_(QuicTime::Delta::FromMilliseconds(1)),
         hundred_ms_(QuicTime::Delta::FromMilliseconds(100)),
-        cubic_(&clock_, &stats_) {
-  }
+        cubic_(&clock_) {}
   const QuicTime::Delta one_ms_;
   const QuicTime::Delta hundred_ms_;
   MockClock clock_;
-  QuicConnectionStats stats_;
   Cubic cubic_;
 };
 
 TEST_F(CubicTest, AboveOrigin) {
   // Convex growth.
   const QuicTime::Delta rtt_min = hundred_ms_;
   QuicPacketCount current_cwnd = 10;
   QuicPacketCount expected_cwnd = current_cwnd + 1;
   // Initialize the state.
   clock_.AdvanceTime(one_ms_);
@@ skipping 40 matching lines @@
   current_cwnd = expected_cwnd;
   // Testing Reno mode increase.
   for (int i = 0; i < 48; ++i) {
     for (QuicPacketCount n = 1; n < current_cwnd / kNConnectionAlpha; ++n) {
       // Call once per ACK, causing cwnd growth in Reno mode.
       cubic_.CongestionWindowAfterAck(current_cwnd, rtt_min);
     }
     // Advance current time so that cwnd update is allowed to happen by Cubic.
     clock_.AdvanceTime(hundred_ms_);
     current_cwnd = cubic_.CongestionWindowAfterAck(current_cwnd, rtt_min);
-    EXPECT_NEAR(expected_cwnd - 10, stats_.cwnd_increase_congestion_avoidance,
-                1);
-    EXPECT_NEAR(1u, stats_.cwnd_increase_cubic_mode, 1);
     expected_cwnd++;
   }
-  QuicPacketCount old_cwnd = current_cwnd;
-  stats_.cwnd_increase_cubic_mode = 0;
-  stats_.cwnd_increase_congestion_avoidance = 0;
 
   // Testing Cubic mode increase.
   for (int i = 0; i < 52; ++i) {
     for (QuicPacketCount n = 1; n < current_cwnd; ++n) {
       // Call once per ACK.
       cubic_.CongestionWindowAfterAck(current_cwnd, rtt_min);
     }
     clock_.AdvanceTime(hundred_ms_);
     current_cwnd = cubic_.CongestionWindowAfterAck(current_cwnd, rtt_min);
   }
-  // Total time elapsed so far; add min_rtt (0.1s) here as well.
-  float elapsed_time_s = 10.0f + 0.1f;
-  // |expected_cwnd| is initial value of cwnd + K * t^3, where K = 0.4.
-  expected_cwnd = 11 + (elapsed_time_s * elapsed_time_s * elapsed_time_s * 410)
-      / 1024;
-  EXPECT_EQ(expected_cwnd - old_cwnd, stats_.cwnd_increase_cubic_mode);
-  EXPECT_EQ(expected_cwnd - old_cwnd,
-            stats_.cwnd_increase_congestion_avoidance);
 }
 
 
 TEST_F(CubicTest, LossEvents) {
   const QuicTime::Delta rtt_min = hundred_ms_;
   QuicPacketCount current_cwnd = 422;
   QuicPacketCount expected_cwnd = current_cwnd + 1;
   // Initialize the state.
   clock_.AdvanceTime(one_ms_);
   EXPECT_EQ(expected_cwnd,
@@ skipping 14 matching lines @@
   // Initialize the state.
   clock_.AdvanceTime(one_ms_);
   EXPECT_EQ(expected_cwnd,
             cubic_.CongestionWindowAfterAck(current_cwnd, rtt_min));
   expected_cwnd = static_cast<QuicPacketCount>(current_cwnd * kNConnectionBeta);
   EXPECT_EQ(expected_cwnd,
             cubic_.CongestionWindowAfterPacketLoss(current_cwnd));
   current_cwnd = expected_cwnd;
   // First update after loss to initialize the epoch.
   current_cwnd = cubic_.CongestionWindowAfterAck(current_cwnd, rtt_min);
-  QuicPacketCount old_cwnd = current_cwnd;
   // Cubic phase.
-  stats_.cwnd_increase_cubic_mode = 0;
-  stats_.cwnd_increase_congestion_avoidance = 0;
   for (int i = 0; i < 40 ; ++i) {
     clock_.AdvanceTime(hundred_ms_);
     current_cwnd = cubic_.CongestionWindowAfterAck(current_cwnd, rtt_min);
   }
   expected_cwnd = 422;
   EXPECT_EQ(expected_cwnd, current_cwnd);
-  EXPECT_EQ(expected_cwnd - old_cwnd, stats_.cwnd_increase_cubic_mode);
-  EXPECT_EQ(expected_cwnd - old_cwnd,
-            stats_.cwnd_increase_congestion_avoidance);
 }
 
 }  // namespace test
 }  // namespace net