X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Flibrte_bitratestats%2Frte_bitrate.c;h=3ceb3516685b74aecb265b152e1dbd7513ae42e6;hb=98a7ea332ba3da0f74ec951595d36a616165b255;hp=260750fe8433dacf829afd5a2b37d108a42a74d2;hpb=2ad7ba9a6567029c2e497e8b61df96d7b911c70f;p=dpdk.git

diff --git a/lib/librte_bitratestats/rte_bitrate.c b/lib/librte_bitratestats/rte_bitrate.c
index 260750fe84..3ceb351668 100644
--- a/lib/librte_bitratestats/rte_bitrate.c
+++ b/lib/librte_bitratestats/rte_bitrate.c
@@ -112,12 +112,17 @@ rte_stats_bitrate_calc(struct rte_stats_bitrates *bitrate_data,
 		port_data->peak_ibits = cnt_bits;
 	delta = cnt_bits;
 	delta -= port_data->ewma_ibits;
-	/* The +-50 fixes integer rounding during divison */
+	/* The +-50 fixes integer rounding during division */
 	if (delta > 0)
 		delta = (delta * alpha_percent + 50) / 100;
 	else
 		delta = (delta * alpha_percent - 50) / 100;
 	port_data->ewma_ibits += delta;
+	/* Integer roundoff prevents EWMA between 0 and (100/alpha_percent)
+	 * ever reaching zero in no-traffic conditions
+	 */
+	if (cnt_bits == 0 && delta == 0)
+		port_data->ewma_ibits = 0;
 	port_data->mean_ibits = cnt_bits;
 
 	/* Outgoing bitrate (also EWMA) */
@@ -132,6 +137,8 @@ rte_stats_bitrate_calc(struct rte_stats_bitrates *bitrate_data,
 	else
 		delta = (delta * alpha_percent - 50) / 100;
 	port_data->ewma_obits += delta;
+	if (cnt_bits == 0 && delta == 0)
+		port_data->ewma_obits = 0;
 	port_data->mean_obits = cnt_bits;
 
 	values[0] = port_data->ewma_ibits;