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.r...@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
