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ixgbe: Drop Rx alloc at end of Rx cleanup 

This change removes the Rx buffer allocation at the end of ixgbe_clean_rx_irq.
The reason for removing this is to avoid the extra latency introduced by the
MMIO write.  This can amount to somewhere around an extra 100ns of latency and
one extra message worth of PCIe bus overhead.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2014-07-26 02:42:39 +00:00 committed by Jeff Kirsher
parent db99d95c90
commit 15be71c92f
1 changed files with 0 additions and 3 deletions
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3
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
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@ -2077,9 +2077,6 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
q_vector->rx.total_packets += total_rx_packets;
q_vector->rx.total_bytes += total_rx_bytes;
if (cleaned_count)
ixgbe_alloc_rx_buffers(rx_ring, cleaned_count);
return total_rx_packets;
}