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udp: use skb_attempt_defer_free()

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Move skb freeing from udp recvmsg() path to the cpu
which allocated/received it, as TCP did in linux-5.17.

This increases max thoughput by 20% to 30%, depending
on number of BH producers.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250916160951.541279-11-edumazet@google.com
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Eric Dumazet 2025-09-16 16:09:51 +00:00 committed by Paolo Abeni
parent 3cd04c8f4a
commit 6471658dc6
1 changed files with 7 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

7
net/ipv4/udp.c
View file

@ -1825,6 +1825,13 @@ void skb_consume_udp(struct sock *sk, struct sk_buff *skb, int len)
if (unlikely(READ_ONCE(udp_sk(sk)->peeking_with_offset)))
sk_peek_offset_bwd(sk, len);
if (!skb_shared(skb)) {
if (unlikely(udp_skb_has_head_state(skb)))
skb_release_head_state(skb);
skb_attempt_defer_free(skb);
return;
}
if (!skb_unref(skb))
return;