mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-13 10:02:38 +00:00
Code Issues Releases Activity

Fix for bad performance when mtu is increased.

Browse Source 
Update the auto moderation behavior in the mlxen driver to match
the new LINUX OFED code.

Submitted by:	odeds
This commit is contained in:
Alfred Perlstein 2013-11-08 18:26:28 +00:00
parent 58f91ead4b
commit d3e98a133b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=257863
3 changed files with 43 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
sys/ofed/drivers/net/mlx4/en_ethtool.c
View File

@ -366,13 +366,13 @@ static int mlx4_en_set_coalesce(struct net_device *dev,
priv->rx_usecs_high = coal->rx_coalesce_usecs_high;
priv->sample_interval = coal->rate_sample_interval;
priv->adaptive_rx_coal = coal->use_adaptive_rx_coalesce;
priv->last_moder_time = MLX4_EN_AUTO_CONF;
if (priv->adaptive_rx_coal)
return 0;
for (i = 0; i < priv->rx_ring_num; i++) {
priv->rx_cq[i].moder_cnt = priv->rx_frames;
priv->rx_cq[i].moder_time = priv->rx_usecs;
priv->last_moder_time[i] = MLX4_EN_AUTO_CONF;
err = mlx4_en_set_cq_moder(priv, &priv->rx_cq[i]);
if (err)
return err;
@ -418,6 +418,7 @@ static int mlx4_en_set_ringparam(struct net_device *dev,
u32 rx_size, tx_size;
int port_up = 0;
int err = 0;
int i;
if (param->rx_jumbo_pending || param->rx_mini_pending)
return -EINVAL;
@ -456,6 +457,15 @@ static int mlx4_en_set_ringparam(struct net_device *dev,
en_err(priv, "Failed starting port\n");
}
for (i = 0; i < priv->rx_ring_num; i++) {
priv->rx_cq[i].moder_cnt = priv->rx_frames;
priv->rx_cq[i].moder_time = priv->rx_usecs;
priv->last_moder_time[i] = MLX4_EN_AUTO_CONF;
err = mlx4_en_set_cq_moder(priv, &priv->rx_cq[i]);
if (err)
goto out;
}
out:
mutex_unlock(&mdev->state_lock);
return err;

87
sys/ofed/drivers/net/mlx4/en_netdev.c
View File

@ -318,6 +318,9 @@ static void mlx4_en_set_default_moderation(struct mlx4_en_priv *priv)
cq = &priv->rx_cq[i];
cq->moder_cnt = priv->rx_frames;
cq->moder_time = priv->rx_usecs;
priv->last_moder_time[i] = MLX4_EN_AUTO_CONF;
priv->last_moder_packets[i] = 0;
priv->last_moder_bytes[i] = 0;
}
for (i = 0; i < priv->tx_ring_num; i++) {
@ -333,11 +336,8 @@ static void mlx4_en_set_default_moderation(struct mlx4_en_priv *priv)
priv->rx_usecs_high = MLX4_EN_RX_COAL_TIME_HIGH;
priv->sample_interval = MLX4_EN_SAMPLE_INTERVAL;
priv->adaptive_rx_coal = 1;
priv->last_moder_time = MLX4_EN_AUTO_CONF;
priv->last_moder_jiffies = 0;
priv->last_moder_packets = 0;
priv->last_moder_tx_packets = 0;
priv->last_moder_bytes = 0;
}
static void mlx4_en_auto_moderation(struct mlx4_en_priv *priv)
@ -349,43 +349,29 @@ static void mlx4_en_auto_moderation(struct mlx4_en_priv *priv)
unsigned long avg_pkt_size;
unsigned long rx_packets;
unsigned long rx_bytes;
unsigned long tx_packets;
unsigned long tx_pkt_diff;
unsigned long rx_pkt_diff;
int moder_time;
int i, err;
int ring, err;
if (!priv->adaptive_rx_coal || period < priv->sample_interval * HZ)
return;
for (ring = 0; ring < priv->rx_ring_num; ring++) {
spin_lock(&priv->stats_lock);
rx_packets = priv->rx_ring[ring].packets;
rx_bytes = priv->rx_ring[ring].bytes;
spin_unlock(&priv->stats_lock);
spin_lock(&priv->stats_lock);
rx_packets = priv->dev->if_ipackets;
rx_bytes = priv->dev->if_ibytes;
tx_packets = priv->dev->if_opackets;
spin_unlock(&priv->stats_lock);
rx_pkt_diff = ((unsigned long) (rx_packets -
priv->last_moder_packets[ring]));
packets = rx_pkt_diff;
rate = packets * HZ / period;
avg_pkt_size = packets ? ((unsigned long) (rx_bytes -
priv->last_moder_bytes[ring])) / packets : 0;
if (!priv->last_moder_jiffies || !period)
goto out;
tx_pkt_diff = ((unsigned long) (tx_packets -
priv->last_moder_tx_packets));
rx_pkt_diff = ((unsigned long) (rx_packets -
priv->last_moder_packets));
packets = max(tx_pkt_diff, rx_pkt_diff);
rate = packets * HZ / period;
avg_pkt_size = packets ? ((unsigned long) (rx_bytes -
priv->last_moder_bytes)) / packets : 0;
/* Apply auto-moderation only when packet rate exceeds a rate that
* it matters */
if (rate > MLX4_EN_RX_RATE_THRESH) {
/* If tx and rx packet rates are not balanced, assume that
* traffic is mainly BW bound and apply maximum moderation.
* Otherwise, moderate according to packet rate */
if (2 * tx_pkt_diff > 3 * rx_pkt_diff ||
2 * rx_pkt_diff > 3 * tx_pkt_diff) {
moder_time = priv->rx_usecs_high;
} else {
/* Apply auto-moderation only when packet rate
* exceeds a rate that it matters */
if (rate > (MLX4_EN_RX_RATE_THRESH / priv->rx_ring_num) &&
avg_pkt_size > MLX4_EN_AVG_PKT_SMALL) {
if (rate < priv->pkt_rate_low ||
avg_pkt_size < MLX4_EN_AVG_PKT_SMALL)
moder_time = priv->rx_usecs_low;
@ -396,38 +382,23 @@ static void mlx4_en_auto_moderation(struct mlx4_en_priv *priv)
(priv->rx_usecs_high - priv->rx_usecs_low) /
(priv->pkt_rate_high - priv->pkt_rate_low) +
priv->rx_usecs_low;
} else {
moder_time = priv->rx_usecs_low;
}
} else {
/* When packet rate is low, use default moderation rather than
* 0 to prevent interrupt storms if traffic suddenly increases */
moder_time = priv->rx_usecs;
}
en_dbg(INTR, priv, "tx rate:%lu rx_rate:%lu\n",
tx_pkt_diff * HZ / period, rx_pkt_diff * HZ / period);
en_dbg(INTR, priv, "Rx moder_time changed from:%d to %d period:%lu "
"[jiff] packets:%lu avg_pkt_size:%lu rate:%lu [p/s])\n",
priv->last_moder_time, moder_time, period, packets,
avg_pkt_size, rate);
if (moder_time != priv->last_moder_time) {
priv->last_moder_time = moder_time;
for (i = 0; i < priv->rx_ring_num; i++) {
cq = &priv->rx_cq[i];
if (moder_time != priv->last_moder_time[ring]) {
priv->last_moder_time[ring] = moder_time;
cq = &priv->rx_cq[ring];
cq->moder_time = moder_time;
err = mlx4_en_set_cq_moder(priv, cq);
if (err) {
en_err(priv, "Failed modifying moderation for cq:%d\n", i);
break;
}
if (err)
en_err(priv, "Failed modifying moderation "
"for cq:%d\n", ring);
}
priv->last_moder_packets[ring] = rx_packets;
priv->last_moder_bytes[ring] = rx_bytes;
}
out:
priv->last_moder_packets = rx_packets;
priv->last_moder_tx_packets = tx_packets;
priv->last_moder_bytes = rx_bytes;
priv->last_moder_jiffies = jiffies;
}

7
sys/ofed/drivers/net/mlx4/mlx4_en.h
View File

@ -494,11 +494,11 @@ struct mlx4_en_priv {
struct mlx4_en_port_state port_state;
spinlock_t stats_lock;
unsigned long last_moder_packets;
unsigned long last_moder_packets[MAX_RX_RINGS];
unsigned long last_moder_tx_packets;
unsigned long last_moder_bytes;
unsigned long last_moder_bytes[MAX_RX_RINGS];
unsigned long last_moder_jiffies;
int last_moder_time;
int last_moder_time[MAX_RX_RINGS];
u16 rx_usecs;
u16 rx_frames;
u16 tx_usecs;
@ -568,7 +568,6 @@ enum mlx4_en_wol {
MLX4_EN_WOL_DO_MODIFY = (1ULL << 63),
};
int mlx4_en_transmit(struct net_device *dev, struct mbuf *mb);
void mlx4_en_qflush(struct net_device *dev);