pp2: change default queue size

Reduce default queue size to twice the vlib frame size. This throttles
the PP from transferring more packets than are necessary for the next
round of graph execution on a core. When combined with DMA'ing into L3
cache, Mpps for 64B packets increases 35%.

Change-Id: I0afe426d23560f262fdc56accb6302b099bd0076
Signed-off-by: Brian Brooks <brian.brooks@arm.com>

diff --git a/src/plugins/marvell/pp2/pp2.c b/src/plugins/marvell/pp2/pp2.c
index 47c853d..ded2b49 100644 (file)
--- a/src/plugins/marvell/pp2/pp2.c
+++ b/src/plugins/marvell/pp2/pp2.c
@@ -200,8 +200,8 @@ mrvl_pp2_create_if (mrvl_pp2_create_if_args_t * args)
   n_outqs = tm->n_vlib_mains;
 
   /* defaults */
-  args->tx_q_sz = args->tx_q_sz ? args->tx_q_sz : 2048;
-  args->rx_q_sz = args->rx_q_sz ? args->rx_q_sz : 2048;
+  args->tx_q_sz = args->tx_q_sz ? args->tx_q_sz : 2 * VLIB_FRAME_SIZE;
+  args->rx_q_sz = args->rx_q_sz ? args->rx_q_sz : 2 * VLIB_FRAME_SIZE;
 
   if (vec_len (ppm->per_thread_data) == 0)
     {