netdev - [PATCH net-next 3/3] net: increase skb_defer

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Message-ID: <20251106202935.1776179-4-edumazet@google.com>
Date: Thu,  6 Nov 2025 20:29:35 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, Kuniyuki Iwashima <kuniyu@...gle.com>, 
	Willem de Bruijn <willemb@...gle.com>, netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 3/3] net: increase skb_defer_max default to 128

skb_defer_max value is very conservative, and can be increased
to avoid too many calls to kick_defer_list_purge().

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 Documentation/admin-guide/sysctl/net.rst | 4 ++--
 net/core/hotdata.c                       | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/admin-guide/sysctl/net.rst b/Documentation/admin-guide/sysctl/net.rst
index 991773dcb9cfe57f64bffabc018549b712aed9b0..369a738a68193e897d880eeb2c5a22cd90833938 100644
--- a/Documentation/admin-guide/sysctl/net.rst
+++ b/Documentation/admin-guide/sysctl/net.rst
@@ -355,9 +355,9 @@ skb_defer_max
 -------------
 
 Max size (in skbs) of the per-cpu list of skbs being freed
-by the cpu which allocated them. Used by TCP stack so far.
+by the cpu which allocated them.
 
-Default: 64
+Default: 128
 
 optmem_max
 ----------
diff --git a/net/core/hotdata.c b/net/core/hotdata.c
index 95d0a4df10069e4529fb9e5b58e8391574085cf1..dddd5c287cf08ba75aec1cc546fd1bc48c0f7b26 100644
--- a/net/core/hotdata.c
+++ b/net/core/hotdata.c
@@ -20,7 +20,7 @@ struct net_hotdata net_hotdata __cacheline_aligned = {
 	.dev_tx_weight = 64,
 	.dev_rx_weight = 64,
 	.sysctl_max_skb_frags = MAX_SKB_FRAGS,
-	.sysctl_skb_defer_max = 64,
+	.sysctl_skb_defer_max = 128,
 	.sysctl_mem_pcpu_rsv = SK_MEMORY_PCPU_RESERVE
 };
 EXPORT_SYMBOL(net_hotdata);
-- 
2.51.2.1041.gc1ab5b90ca-goog