relnote: Avoid redundant recvmmsg when the previous recvmmsg returned

net/quic/quic_flags.cc

 // Copyright 2014 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_flags.h"
 
 bool FLAGS_quic_allow_oversized_packets_for_test = false;
 
 // When true, the use time based loss detection instead of nack.
 bool FLAGS_quic_use_time_loss_detection = false;
@@ skipping 62 matching lines @@
 // If true, use an interval set as the internal representation of a packet queue
 // instead of a set.
 bool FLAGS_quic_packet_queue_use_interval_set = true;
 
 // If true, Cubic's epoch is shifted when the sender is application-limited.
 bool FLAGS_shift_quic_cubic_epoch_when_app_limited = true;
 
 // If true, accounts for available (implicitly opened) streams under a separate
 // quota from open streams, which is 10 times larger.
 bool FLAGS_allow_many_available_streams = true;
+
+// If true, QuicPacketReader::ReadAndDispatchPackets will only return true if
+// recvmmsg fills all of the passed in messages. Otherwise, it will return true
+// if recvmmsg read any messages.
+bool FLAGS_quic_read_packets_full_recvmmsg = true;