Commit fd9557c3 authored by Eric Dumazet's avatar Eric Dumazet Committed by Jakub Kicinski
Browse files

net: add prefetch() in skb_defer_free_flush() 



skb_defer_free_flush() is becoming more important these days.

Add a prefetch operation to reduce latency a bit on some
platforms like AMD EPYC 7B12.

On more recent cpus, a stall happens when reading skb_shinfo().
Avoiding it will require a more elaborate strategy.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Acked-by: default avatarPaolo Abeni <pabeni@redhat.com>
Link: https://patch.msgid.link/20251106085500.2438951-1-edumazet@google.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 01c87d7f

net/core/dev.c

+1 −0
Original line number Diff line number Diff line
@@ -6782,6 +6782,7 @@ static void skb_defer_free_flush(void) 
		free_list = llist_del_all(&sdn->defer_list);



		llist_for_each_entry_safe(skb, next, free_list, ll_node) {

			prefetch(next);

			napi_consume_skb(skb, 1);

		}

	}