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igb: Improve multiqueue AIM support

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Improve multiqueue performance
Change itr_val to reflect ITR timer value instead of ints/sec
Cleaned up AIM algorithms in general

Based on work by Mitch Williams

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Acked-by: Mitch Williams <mitch.a.williams@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Alexander Duyck
2008-07-08 15:14:44 -07:00
committed by Jeff Garzik
parent 9280fa5201
commit 6eb5a7f1db
3 changed files with 117 additions and 85 deletions
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17
drivers/net/igb/igb_ethtool.c
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@@ -1861,6 +1861,8 @@ static int igb_set_coalesce(struct net_device *netdev,
struct ethtool_coalesce *ec)
{
struct igb_adapter *adapter = netdev_priv(netdev);
struct e1000_hw *hw = &adapter->hw;
int i;
if ((ec->rx_coalesce_usecs > IGB_MAX_ITR_USECS) ||
((ec->rx_coalesce_usecs > 3) &&
@@ -1869,13 +1871,16 @@ static int igb_set_coalesce(struct net_device *netdev,
return -EINVAL;
/* convert to rate of irq's per second */
if (ec->rx_coalesce_usecs <= 3)
if (ec->rx_coalesce_usecs && ec->rx_coalesce_usecs <= 3) {
adapter->itr_setting = ec->rx_coalesce_usecs;
else
adapter->itr_setting = (1000000 / ec->rx_coalesce_usecs);
adapter->itr = IGB_START_ITR;
} else {
adapter->itr_setting = ec->rx_coalesce_usecs << 2;
adapter->itr = adapter->itr_setting;
}
if (netif_running(netdev))
igb_reinit_locked(adapter);
for (i = 0; i < adapter->num_rx_queues; i++)
wr32(adapter->rx_ring[i].itr_register, adapter->itr);
return 0;
}
@@ -1888,7 +1893,7 @@ static int igb_get_coalesce(struct net_device *netdev,
if (adapter->itr_setting <= 3)
ec->rx_coalesce_usecs = adapter->itr_setting;
else
ec->rx_coalesce_usecs = 1000000 / adapter->itr_setting;
ec->rx_coalesce_usecs = adapter->itr_setting >> 2;
return 0;
}