From: Jason Xing Date: Tue, 18 Nov 2025 07:06:43 +0000 (+0800) Subject: net: increase default NAPI_SKB_CACHE_SIZE to 128 X-Git-Tag: v6.19-rc1~170^2~117^2~3 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3505730d9042a8d26e89288ecab04e5d32794e4a;p=thirdparty%2Fkernel%2Flinux.git net: increase default NAPI_SKB_CACHE_SIZE to 128 After commit b61785852ed0 ("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 Signed-off-by: Jason Xing Reviewed-by: Eric Dumazet Reviewed-by: Alexander Lobakin Link: https://patch.msgid.link/20251118070646.61344-2-kerneljasonxing@gmail.com Signed-off-by: Jakub Kicinski --- diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 9feea830a4dbb..e4abf0e567767 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -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)