app/testpmd: fix burst stats reporting

When RTE_TEST_PMD_RECORD_BURST_STATS is enabled, testpmd collects
burst statistics and includes them in the port stats report.  The
summary should include top 2 most frequent burst sizes, but there is a
bug in finding the top-2.  During the scan of burst size counts, the
top-2 can change only if top-1 also changes.

Added logic to update the top-2 if current burst size is larger than
existing top-2, but smaller than existing top-1.

Fixes: af75078fece3 ("first public release")
Cc: stable@dpdk.org
Signed-off-by: Daniel Shelepov <dashel@microsoft.com>
Acked-by: Bernard Iremonger <bernard.iremonger@intel.com>

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 1344016..017cc61 100644 (file)
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -951,6 +951,9 @@ pkt_burst_stats_display(const char *rx_tx, struct pkt_burst_stats *pbs)
                        pktnb_stats[1] = pktnb_stats[0];
                        burst_stats[0] = nb_burst;
                        pktnb_stats[0] = nb_pkt;
+               } else if (nb_burst > burst_stats[1]) {
+                       burst_stats[1] = nb_burst;
+                       pktnb_stats[1] = nb_pkt;
                }
        }
        if (total_burst == 0)