Add a new histogram: Net.QuicSession.OutOfOrderGapReceived

net/quic/quic_connection_logger.cc

 // Copyright (c) 2013 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 "net/quic/quic_connection_logger.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 283 matching lines @@
     if (delta > 1) {
       // There is a gap between the largest packet previously received and
       // the current packet.  This indicates either loss, or out-of-order
       // delivery.
       UMA_HISTOGRAM_COUNTS("Net.QuicSession.PacketGapReceived", delta - 1);
     }
     largest_received_packet_sequence_number_ = header.packet_sequence_number;
   }
   if (header.packet_sequence_number < last_received_packet_sequence_number_) {
     ++out_of_order_recieved_packet_count_;
+    UMA_HISTOGRAM_COUNTS("Net.QuicSession.OutOfOrderGapReceived",
+                         last_received_packet_sequence_number_ -
+                             header.packet_sequence_number);
   }
   last_received_packet_sequence_number_ = header.packet_sequence_number;
 }
 
 void QuicConnectionLogger::OnStreamFrame(const QuicStreamFrame& frame) {
   net_log_.AddEvent(
       NetLog::TYPE_QUIC_SESSION_STREAM_FRAME_RECEIVED,
       base::Bind(&NetLogQuicStreamFrameCallback, &frame));
 }
 
@@ skipping 93 matching lines @@
 }
 
 void QuicConnectionLogger::OnConnectionClose(QuicErrorCode error,
                                              bool from_peer) {
   net_log_.AddEvent(
       NetLog::TYPE_QUIC_SESSION_CLOSED,
       base::Bind(&NetLogQuicConnectionClosedCallback, error, from_peer));
 }
 
 }  // namespace net