net: remove useless prefetch() call
There is no gain using prefetch() in dev_hard_start_xmit(), since we already had to read ops->ndo_select_queue pointer in dev_pick_tx(), and both pointers are probably located in the same cache line. This prefetch call slows down fast path because of a stall in address computation. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>hifive-unleashed-5.1
parent
8d2f9e8116
commit
ed734a97c6
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@ -1670,7 +1670,6 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
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const struct net_device_ops *ops = dev->netdev_ops;
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const struct net_device_ops *ops = dev->netdev_ops;
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int rc;
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int rc;
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prefetch(&dev->netdev_ops->ndo_start_xmit);
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if (likely(!skb->next)) {
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if (likely(!skb->next)) {
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if (!list_empty(&ptype_all))
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if (!list_empty(&ptype_all))
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dev_queue_xmit_nit(skb, dev);
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dev_queue_xmit_nit(skb, dev);
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