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mlx4_en: Coalescing target is equal for all mtu's

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The interrupt moderation should not depend on number of incoming
bytes, but on number of incoming packets.
The previous scheme caused very high interrupts rate for small
messages when big MTU was configured.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yevgeny Petrilin 2009-06-01 23:23:13 +00:00 committed by David S. Miller
parent 3c2fa83f9c
commit 3db36fb2c8
3 changed files with 4 additions and 5 deletions
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3
drivers/net/mlx4/en_ethtool.c
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@ -268,8 +268,7 @@ static int mlx4_en_set_coalesce(struct net_device *dev,
priv->rx_frames = (coal->rx_max_coalesced_frames ==
MLX4_EN_AUTO_CONF) ?
MLX4_EN_RX_COAL_TARGET /
priv->dev->mtu + 1 :
MLX4_EN_RX_COAL_TARGET :
coal->rx_max_coalesced_frames;
priv->rx_usecs = (coal->rx_coalesce_usecs ==
MLX4_EN_AUTO_CONF) ?

2
drivers/net/mlx4/en_netdev.c
View File

@ -372,7 +372,7 @@ static void mlx4_en_set_default_moderation(struct mlx4_en_priv *priv)
* satisfy our coelsing target.
* - moder_time is set to a fixed value.
*/
priv->rx_frames = MLX4_EN_RX_COAL_TARGET / priv->dev->mtu + 1;
priv->rx_frames = MLX4_EN_RX_COAL_TARGET;
priv->rx_usecs = MLX4_EN_RX_COAL_TIME;
en_dbg(INTR, priv, "Default coalesing params for mtu:%d - "
"rx_frames:%d rx_usecs:%d\n",

4
drivers/net/mlx4/mlx4_en.h
View File

@ -143,8 +143,8 @@ enum {
#define MLX4_EN_DEF_TX_RING_SIZE 1024
#define MLX4_EN_DEF_RX_RING_SIZE 1024
/* Target number of bytes to coalesce with interrupt moderation */
#define MLX4_EN_RX_COAL_TARGET 0x20000
/* Target number of packets to coalesce with interrupt moderation */
#define MLX4_EN_RX_COAL_TARGET 44
#define MLX4_EN_RX_COAL_TIME 0x10
#define MLX4_EN_TX_COAL_PKTS 5