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sfc: Implement adaptive IRQ moderation

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Calculate a score for each 1000 IRQs:
- TX completions are worth 1 point
- RX completions are worth 4 if merged using LRO or 2 otherwise

Reduce moderation if the score is less than 10000, down to a minimum
of 5 us.  Increase moderation if the score is more than 20000, up to
the specified maximum.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings
2009-03-20 13:30:37 +00:00
committed by David S. Miller
parent 85451a951b
commit 6fb70fd1b5
6 changed files with 73 additions and 21 deletions
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19
drivers/net/sfc/ethtool.c
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@@ -604,7 +604,6 @@ static int efx_ethtool_get_coalesce(struct net_device *net_dev,
{
struct efx_nic *efx = netdev_priv(net_dev);
struct efx_tx_queue *tx_queue;
struct efx_rx_queue *rx_queue;
struct efx_channel *channel;
memset(coalesce, 0, sizeof(*coalesce));
@@ -622,14 +621,8 @@ static int efx_ethtool_get_coalesce(struct net_device *net_dev,
}
}
/* Find lowest IRQ moderation across all used RX queues */
coalesce->rx_coalesce_usecs_irq = ~((u32) 0);
efx_for_each_rx_queue(rx_queue, efx) {
channel = rx_queue->channel;
if (channel->irq_moderation < coalesce->rx_coalesce_usecs_irq)
coalesce->rx_coalesce_usecs_irq =
channel->irq_moderation;
}
coalesce->use_adaptive_rx_coalesce = efx->irq_rx_adaptive;
coalesce->rx_coalesce_usecs_irq = efx->irq_rx_moderation;
return 0;
}
@@ -643,10 +636,9 @@ static int efx_ethtool_set_coalesce(struct net_device *net_dev,
struct efx_nic *efx = netdev_priv(net_dev);
struct efx_channel *channel;
struct efx_tx_queue *tx_queue;
unsigned tx_usecs, rx_usecs;
unsigned tx_usecs, rx_usecs, adaptive;
if (coalesce->use_adaptive_rx_coalesce ||
coalesce->use_adaptive_tx_coalesce)
if (coalesce->use_adaptive_tx_coalesce)
return -EOPNOTSUPP;
if (coalesce->rx_coalesce_usecs || coalesce->tx_coalesce_usecs) {
@@ -657,6 +649,7 @@ static int efx_ethtool_set_coalesce(struct net_device *net_dev,
rx_usecs = coalesce->rx_coalesce_usecs_irq;
tx_usecs = coalesce->tx_coalesce_usecs_irq;
adaptive = coalesce->use_adaptive_rx_coalesce;
/* If the channel is shared only allow RX parameters to be set */
efx_for_each_tx_queue(tx_queue, efx) {
@@ -668,7 +661,7 @@ static int efx_ethtool_set_coalesce(struct net_device *net_dev,
}
}
efx_init_irq_moderation(efx, tx_usecs, rx_usecs);
efx_init_irq_moderation(efx, tx_usecs, rx_usecs, adaptive);
/* Reset channel to pick up new moderation value. Note that
* this may change the value of the irq_moderation field