commit 2a379bfae12738e4db504cc521a0c2afc6187088
author fayang <fayang@google.com> Mon May 18 11:49:25 2020 -0700
committer Copybara-Service <copybara-worker@google.com> Mon May 18 11:49:58 2020 -0700
tree c23397d6f2623e42c2fb32abe813314f765c55ca
parent 281f7a98285d4e1543863c36f08d5e9266970fb1

In quic, record the max consecutive retransmission timeout before making forward progress. stats only change, not protected.

This number will be recorded in TCS on server side, and will be used to populate histogram on client side.

PiperOrigin-RevId: 312123618
Change-Id: I5cd34b2d1559305b2825f6997bc4d7a5c4e2faf8

quic/core/quic_sent_packet_manager.cc

diff --git a/quic/core/quic_sent_packet_manager.cc b/quic/core/quic_sent_packet_manager.cc
index 7ccd82d..7d32176 100644
--- a/quic/core/quic_sent_packet_manager.cc
+++ b/quic/core/quic_sent_packet_manager.cc
@@ -403,6 +403,17 @@
         }
       }
     }
+    // Records the max consecutive RTO or PTO before forward progress has been
+    // made.
+    if (consecutive_rto_count_ >
+        stats_->max_consecutive_rto_with_forward_progress) {
+      stats_->max_consecutive_rto_with_forward_progress =
+          consecutive_rto_count_;
+    } else if (consecutive_pto_count_ >
+               stats_->max_consecutive_rto_with_forward_progress) {
+      stats_->max_consecutive_rto_with_forward_progress =
+          consecutive_pto_count_;
+    }
     // Reset all retransmit counters any time a new packet is acked.
     consecutive_rto_count_ = 0;
     consecutive_tlp_count_ = 0;