Commit b2e9821c authored by Eric Dumazet's avatar Eric Dumazet Committed by Paolo Abeni
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net: prefech skb->priority in __dev_xmit_skb() 



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

In commit 100dfa74 ("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: default avatarEric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20251121083256.674562-11-edumazet@google.com


Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
parent 2f9babc0

net/core/dev.c

+1 −0
Original line number Diff line number Diff line
@@ -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) {

			prefetch(next);

			prefetch(&next->priority);

			skb_mark_not_on_list(skb);

			rc = dev_qdisc_enqueue(skb, q, &to_free, txq);

			count++;