Patchwork PATCH 4/6] mlx4_en: Shift completion vector index between ports

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Submitter Yevgeny Petrilin
Date March 26, 2009, 1:57 p.m.
Message ID <49CB89C6.4060507@mellanox.co.il>
Download mbox | patch
Permalink /patch/25153/
State Rejected
Delegated to: David Miller
Headers show

Comments

Yevgeny Petrilin - March 26, 2009, 1:57 p.m.
For both ports UDP traffic is steered to RX ring 0.
If both the ports attached RX ring 0 to the same completion
vector, all UDP traffic for both ports will be handled by the
same core. Making the shift would prevent this situation.
Dual port UDP Bandwidth was increased by ~70%.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
---
 drivers/net/mlx4/en_cq.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

Patch

diff --git a/drivers/net/mlx4/en_cq.c b/drivers/net/mlx4/en_cq.c
index 91f50de..450cf44 100644
--- a/drivers/net/mlx4/en_cq.c
+++ b/drivers/net/mlx4/en_cq.c
@@ -53,7 +53,8 @@  int mlx4_en_create_cq(struct mlx4_en_priv *priv,
 	cq->size = entries;
 	if (mode == RX) {
 		cq->buf_size = cq->size * sizeof(struct mlx4_cqe);
-		cq->vector   = ring % mdev->dev->caps.num_comp_vectors;
+		cq->vector   = (ring + priv->port) %
+				mdev->dev->caps.num_comp_vectors;
 	} else {
 		cq->buf_size = sizeof(struct mlx4_cqe);
 		cq->vector   = 0;