[dpdk-dev] [PATCH] igb: change default RX wthresh back

[Wenzhuo Lu]

A problem is found on i350 VF. TX will happen once per 4
packets. If only 1~3 packets are received, they will not be
forwarded.

The reason is the default RX write-back threshold is changed
to 4. This patch changes the value back to 0, so every packet
can be handled immediately.

Fixes: 4a41c17dba18 (igb: set default thresholds based on MAC type)
Signed-off-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
---
 drivers/net/e1000/igb_ethdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index bd0ae26..34120ae 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -64,7 +64,7 @@
 
 #define IGB_DEFAULT_RX_PTHRESH      ((hw->mac.type == e1000_i354) ? 12 : 8)
 #define IGB_DEFAULT_RX_HTHRESH      8
-#define IGB_DEFAULT_RX_WTHRESH      ((hw->mac.type == e1000_82576) ? 1 : 4)
+#define IGB_DEFAULT_RX_WTHRESH      0
 
 #define IGB_DEFAULT_TX_PTHRESH      ((hw->mac.type == e1000_i354) ? 20 : 8)
 #define IGB_DEFAULT_TX_HTHRESH      1
-- 
1.9.3