From: Alexander Duyck Date: Sat, 26 Jul 2014 02:42:39 +0000 (+0000) Subject: ixgbe: Drop Rx alloc at end of Rx cleanup X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=15be71c92f10169600b5980ee06836614836057b;p=linux-beck.git 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 Tested-by: Phil Schmitt Signed-off-by: Jeff Kirsher --- diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c index 87613806ee88..6a12bb1d49ca 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -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; }