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net/mlx4_en: Add __GFP_COLD gfp flags in alloc_pages 

Needed in order to get cache cold pages (L3 flushed) for HW scatter.

Otherwise memory may flush those entries when the packet comes from
PCI, causing back pressure resulting in BW decrease.

Signed-off-by: Ido Shamay <idos@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Shamay 2014-11-02 16:26:16 +02:00 committed by David S. Miller
parent 5f6e980080
commit 1ab25f86c4
1 changed files with 4 additions and 3 deletions
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7
drivers/net/ethernet/mellanox/mlx4/en_rx.c
View File

@ -156,7 +156,7 @@ static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
const struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
if (mlx4_alloc_pages(priv, &ring->page_alloc[i],
frag_info, GFP_KERNEL))
frag_info, GFP_KERNEL | __GFP_COLD))
goto out;
}
return 0;
@ -268,7 +268,7 @@ static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
if (mlx4_en_prepare_rx_desc(priv, ring,
ring->actual_size,
GFP_KERNEL)) {
GFP_KERNEL | __GFP_COLD)) {
if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
en_err(priv, "Failed to allocate enough rx buffers\n");
return -ENOMEM;
@ -635,7 +635,8 @@ static void mlx4_en_refill_rx_buffers(struct mlx4_en_priv *priv,
int index = ring->prod & ring->size_mask;
while ((u32) (ring->prod - ring->cons) < ring->actual_size) {
if (mlx4_en_prepare_rx_desc(priv, ring, index, GFP_ATOMIC))
if (mlx4_en_prepare_rx_desc(priv, ring, index,
GFP_ATOMIC | __GFP_COLD))
break;
ring->prod++;
index = ring->prod & ring->size_mask;