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net: prefech skb->priority in __dev_xmit_skb()

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Most qdiscs need to read skb->priority at enqueue time().

In commit 100dfa74ca ("net: dev_queue_xmit() llist adoption")
I added a prefetch(next), lets add another one for the second
half of skb.

Note that skb->priority and skb->hash share a common cache line,
so this patch helps qdiscs needing both fields.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20251121083256.674562-11-edumazet@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Eric Dumazet 2025-11-21 08:32:52 +00:00 committed by Paolo Abeni
parent 2f9babc04d
commit b2e9821cff
1 changed files with 1 additions and 0 deletions
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net/core/dev.c
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@ -4246,6 +4246,7 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
llist_for_each_entry_safe(skb, next, ll_list, ll_node) { llist_for_each_entry_safe(skb, next, ll_list, ll_node) {
prefetch(next); prefetch(next);
prefetch(&next->priority);
skb_mark_not_on_list(skb); skb_mark_not_on_list(skb);
rc = dev_qdisc_enqueue(skb, q, &to_free, txq); rc = dev_qdisc_enqueue(skb, q, &to_free, txq);
count++; count++;