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Mon, 17 Nov 2025 23:07:04 -0800 (PST) Received: from KERNELXING-MB0.tencent.com ([43.132.141.20]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-345651183b2sm11868494a91.2.2025.11.17.23.07.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Nov 2025 23:07:03 -0800 (PST) From: Jason Xing To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org Cc: netdev@vger.kernel.org, Jason Xing Subject: [PATCH net-next 1/4] net: increase default NAPI_SKB_CACHE_SIZE to 128 Date: Tue, 18 Nov 2025 15:06:43 +0800 Message-Id: <20251118070646.61344-2-kerneljasonxing@gmail.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20251118070646.61344-1-kerneljasonxing@gmail.com> References: <20251118070646.61344-1-kerneljasonxing@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Jason Xing 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 --- net/core/skbuff.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 9feea830a4db..e4abf0e56776 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) -- 2.41.3