mlx4: exploit skb->xmit_more to conditionally send doorbell

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skb->xmit_more tells us if another skb is coming next.

We need to send doorbell when : xmit_more is not set,
or txqueue is stopped (preventing next skb to come immediately)

Tested with a modified pktgen version, I got a 40% increase of
throughput.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Eric Dumazet 2014-09-25 07:17:49 -07:00 • committed by David S. Miller

parent a8404ce5ae

commit 5804283d7c

1 changed files with 16 additions and 7 deletions

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23

drivers/net/ethernet/mellanox/mlx4/en_tx.c

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