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net: prefetch the next skb in napi_skb_cache_get()

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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@google.com>
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Link: https://patch.msgid.link/20251118070646.61344-5-kerneljasonxing@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jason Xing
2025-11-18 15:06:46 +08:00
committed by Jakub Kicinski
parent 2d67b5c5c6
commit 5d7fc63ab8
1 changed files with 2 additions and 0 deletions
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2
net/core/skbuff.c
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@@ -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);