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virtio-net: keep tx interrupts disabled unless kick 

Tx napi mode increases the rate of transmit interrupts. Suppress some
by masking interrupts while more packets are expected. The interrupts
will be reenabled before the last packet is sent.

This optimization reduces the througput drop with tx napi for
unidirectional flows such as UDP_STREAM that do not benefit from
cleaning tx completions in the the receive napi handler.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2017-04-24 13:49:30 -04:00 committed by David S. Miller
parent 7b0411ef4a
commit bdb12e0d2f
1 changed files with 3 additions and 0 deletions
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3
drivers/net/virtio_net.c
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@ -1200,6 +1200,9 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
/* Free up any pending old buffers before queueing new ones. */
free_old_xmit_skbs(sq);
if (use_napi && kick)
virtqueue_enable_cb_delayed(sq->vq);
/* timestamp packet in software */
skb_tx_timestamp(skb);