session: measure dispatch period only if under load

[vpp.git] / src / vnet / tcp / tcp_input.c

diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index af13c5f..fb2f1dd 100644 (file)
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -1085,10 +1085,6 @@ tcp_cc_fastrecovery_exit (tcp_connection_t * tc)
   tcp_fastrecovery_1_smss_off (tc);
   tcp_fastrecovery_first_off (tc);
 
-  /* Update pacer because our cwnd changed. Also makes sure
-   * that we recompute the max burst size */
-  tcp_update_pacer (tc);
-
   TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3);
 }
 
@@ -1290,7 +1286,8 @@ tcp_cc_handle_event (tcp_connection_t * tc, u32 is_dack)
        }
       else if (tcp_should_fastrecover (tc))
        {
-         u32 byte_rate;
+         u32 pacer_wnd;
+
          ASSERT (!tcp_in_fastrecovery (tc));
 
          /* Heuristic to catch potential late dupacks
@@ -1319,8 +1316,9 @@ tcp_cc_handle_event (tcp_connection_t * tc, u32 is_dack)
              tc->cwnd = tc->ssthresh + 3 * tc->snd_mss;
            }
 
-         byte_rate = (0.3 * tc->cwnd) / ((f64) TCP_TICK * tc->srtt);
-         transport_connection_tx_pacer_init (&tc->connection, byte_rate, 0);
+         pacer_wnd = clib_max (0.1 * tc->cwnd, 2 * tc->snd_mss);
+         tcp_connection_tx_pacer_reset (tc, pacer_wnd,
+                                        0 /* start bucket */ );
          tcp_program_fastretransmit (tcp_get_worker (tc->c_thread_index),
                                      tc);
          return;