netdev - [PATCH net-next v4 4/4] nfp: use new dim profiles for better latency

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Message-Id: <20240405081547.20676-5-louis.peens@corigine.com>
Date: Fri,  5 Apr 2024 10:15:47 +0200
From: Louis Peens <louis.peens@...igine.com>
To: David Miller <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Jiri Pirko <jiri@...nulli.us>,
	Fei Qin <fei.qin@...igine.com>,
	netdev@...r.kernel.org,
	oss-drivers@...igine.com
Subject: [PATCH net-next v4 4/4] nfp: use new dim profiles for better latency

From: Fei Qin <fei.qin@...igine.com>

Latency comparison between EQE profiles and SPECIFIC_0 profiles
for 5 different runs:

                                     Latency (us)
EQE profiles 	    |	132.85  136.32  131.31  131.37  133.51
SPECIFIC_0 profiles |	92.09   92.16   95.58   98.26   89.79

Signed-off-by: Fei Qin <fei.qin@...igine.com>
Signed-off-by: Louis Peens <louis.peens@...igine.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 997cc4fcffdb..4c2dac1e1be4 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1232,12 +1232,12 @@ static void nfp_net_open_stack(struct nfp_net *nn)
 
 		if (r_vec->rx_ring) {
 			INIT_WORK(&r_vec->rx_dim.work, nfp_net_rx_dim_work);
-			r_vec->rx_dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
+			r_vec->rx_dim.mode = DIM_CQ_PERIOD_MODE_SPECIFIC_0;
 		}
 
 		if (r_vec->tx_ring) {
 			INIT_WORK(&r_vec->tx_dim.work, nfp_net_tx_dim_work);
-			r_vec->tx_dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
+			r_vec->tx_dim.mode = DIM_CQ_PERIOD_MODE_SPECIFIC_0;
 		}
 
 		napi_enable(&r_vec->napi);
-- 
2.34.1