[dpdk-dev] [PATCH] net/ice: enlarge ice RXQ rearm thresh to 64

[Leyi Rong]

We observe performance drop on ice AVX512 data path after stop and
start by using testpmd.

As CPU polling is faster in AVX512 path, L3 contested accesses is
intensified when rxrearm_start is a random value after testpmd
stop/start.

Enlarge ICE_RXQ_REARM_THRESH to 64 to ease the contested asscesses and
fix the performance drop issue.

Signed-off-by: Leyi Rong <leyi.rong at intel.com>
---
 drivers/net/ice/ice_rxtx.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ice/ice_rxtx.h b/drivers/net/ice/ice_rxtx.h
index 6b16716063..adfae016a9 100644
--- a/drivers/net/ice/ice_rxtx.h
+++ b/drivers/net/ice/ice_rxtx.h
@@ -31,7 +31,7 @@
 
 #define ICE_VPMD_RX_BURST           32
 #define ICE_VPMD_TX_BURST           32
-#define ICE_RXQ_REARM_THRESH        32
+#define ICE_RXQ_REARM_THRESH        64
 #define ICE_MAX_RX_BURST            ICE_RXQ_REARM_THRESH
 #define ICE_TX_MAX_FREE_BUF_SZ      64
 #define ICE_DESCS_PER_LOOP          4
-- 
2.17.1