netdev - [PATCH net-next 4/4] net: prefetch the next skb in napi_skb_cache

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Message-Id: <20251118070646.61344-5-kerneljasonxing@gmail.com>
Date: Tue, 18 Nov 2025 15:06:46 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org
Cc: netdev@...r.kernel.org,
	Jason Xing <kernelxing@...cent.com>
Subject: [PATCH net-next 4/4] net: prefetch the next skb in napi_skb_cache_get()

From: Jason Xing <kernelxing@...cent.com>

After getting the current skb in napi_skb_cache_get(), the next skb in
cache is highly likely to be used soon, so prefetch would be helpful.

Suggested-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Jason Xing <kernelxing@...cent.com>
---
 net/core/skbuff.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index d81ac78c32ff..5a1d123e7ef7 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -299,6 +299,8 @@ static struct sk_buff *napi_skb_cache_get(bool alloc)
 	}
 
 	skb = nc->skb_cache[--nc->skb_count];
+	if (nc->skb_count)
+		prefetch(nc->skb_cache[nc->skb_count - 1]);
 	local_unlock_nested_bh(&napi_alloc_cache.bh_lock);
 	kasan_mempool_unpoison_object(skb, skbuff_cache_size);
 
-- 
2.41.3