diff options
| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2012-04-25 04:36:38 +0000 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2012-05-09 22:31:44 -0700 |
| commit | 3ebe8fdeb043e8c630cac6dc90d483e729e17017 (patch) | |
| tree | d4f16a8ac2bb88460cf817477d5acb4a3e18f54d /drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_nl.c | |
| parent | 943561d3e7f82645aafb65839feb9f99e2718bac (diff) | |
ixgbe: Set Drop_EN bit when multiple Rx queues are present w/o flow control
The drop enable bit can be used to improve the performance of the adapter
in the case of multiple queues being present. This performance gain is due
to the fact that some slower CPUs can cause the FIFO to backfill preventing
faster CPUs from receiving additional work. By setting the drop enable bit
we prevent this and instead just drop the packets that would have been
bound for the slower CPU.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_nl.c')
| -rw-r--r-- | drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_nl.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_nl.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_nl.c index 7f2fa699277..5164a21b13c 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_nl.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_nl.c @@ -395,6 +395,9 @@ static u8 ixgbe_dcbnl_set_all(struct net_device *netdev) } else { hw->mac.ops.fc_enable(hw); } + + ixgbe_set_rx_drop_en(adapter); + ret = DCB_HW_CHG; } @@ -641,6 +644,8 @@ static int ixgbe_dcbnl_ieee_setpfc(struct net_device *dev, else err = hw->mac.ops.fc_enable(hw); + ixgbe_set_rx_drop_en(adapter); + return err; } |