examples/l3fwd: skip Tx queue drain on first FIB iteration

The commit a8f8b672d575 ("examples/l3fwd: skip Tx queue drain on first iteration")
implemented a change to the EM and LPM lookup methods to
prevent the Tx queue drain running in the first iteration of their
packet processing loops.

This patch applies the same change into the new FIB lookup method.

Signed-off-by: Conor Walsh <conor.walsh@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Vladimir Medvedkin <vladimir.medvedkin@intel.com>

diff --git a/examples/l3fwd/l3fwd_fib.c b/examples/l3fwd/l3fwd_fib.c
index c7d7689a942b8209a905a92fb6b90bec592ae845..178722994284cf57884aca93c833cc15a0110c3c 100644 (file)
--- a/examples/l3fwd/l3fwd_fib.c
+++ b/examples/l3fwd/l3fwd_fib.c
@@ -179,8 +179,6 @@ fib_main_loop(__rte_unused void *dummy)
        const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) /
                        US_PER_S * BURST_TX_DRAIN_US;
 
-       prev_tsc = 0;
-
        lcore_id = rte_lcore_id();
        qconf = &lcore_conf[lcore_id];
 
@@ -200,9 +198,10 @@ fib_main_loop(__rte_unused void *dummy)
                                lcore_id, portid, queueid);
        }
 
-       while (!force_quit) {
+       cur_tsc = rte_rdtsc();
+       prev_tsc = cur_tsc;
 
-               cur_tsc = rte_rdtsc();
+       while (!force_quit) {
 
                /* TX burst queue drain. */
                diff_tsc = cur_tsc - prev_tsc;
@@ -233,6 +232,8 @@ fib_main_loop(__rte_unused void *dummy)
                        /* Use fib to lookup port IDs and transmit them. */
                        fib_send_packets(nb_rx, pkts_burst,     portid, qconf);
                }
+
+               cur_tsc = rte_rdtsc();
        }
 
        return 0;