Eric Dumazet 9ac936276f
net/mlx4_en: avoid one cache line miss to ring doorbell ...
This patch caches doorbell address directly in struct mlx4_en_tx_ring.
This removes the need to bring in cpu caches whole struct mlx4_uar
in fast path.
Note that mlx4_uar is not guaranteed to be on a local node,
because mlx4_bf_alloc() uses a single free list (priv->bf_list)
regardless of its node parameter.
This kind of change does matter in presence of light/moderate traffic.
In high stress, this read-only line would be kept hot in caches.
Signed-off-by: Eric Dumazet <edumazet@google.com >
Cc: Tariq Toukan <tariqt@nvidia.com >
Reviewed-by: Tariq Toukan <tariqt@nvidia.com >
Signed-off-by: David S. Miller <davem@davemloft.net >
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9ac936276f