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net: increase default NAPI_SKB_CACHE_SIZE to 128

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After commit b61785852e ("net: increase skb_defer_max default to 128")
changed the value sysctl_skb_defer_max to avoid many calls to
kick_defer_list_purge(), the same situation can be applied to
NAPI_SKB_CACHE_SIZE that was proposed in 2016. It's a trade-off between
using pre-allocated memory in skb_cache and saving more a bit heavy
function calls in the softirq context.

With this patch applied, we can have more skbs per-cpu to accelerate the
sending path that needs to acquire new skbs.

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/20251118070646.61344-2-kerneljasonxing@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jason Xing
2025-11-18 15:06:43 +08:00
committed by Jakub Kicinski
parent 7c9dd38602
commit 3505730d90
1 changed files with 1 additions and 1 deletions
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2
net/core/skbuff.c
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@@ -223,7 +223,7 @@ static void skb_under_panic(struct sk_buff *skb, unsigned int sz, void *addr)
skb_panic(skb, sz, addr, __func__);
}
#define NAPI_SKB_CACHE_SIZE 64
#define NAPI_SKB_CACHE_SIZE 128
#define NAPI_SKB_CACHE_BULK 16
#define NAPI_SKB_CACHE_HALF (NAPI_SKB_CACHE_SIZE / 2)