netdev - [PATCH v2 net-next 0/3] net: lockless skb_attempt_defer

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Message-ID: <20250928084934.3266948-1-edumazet@google.com>
Date: Sun, 28 Sep 2025 08:49:31 +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 v2 net-next 0/3] net: lockless skb_attempt_defer_free()

Platforms with many cpus and relatively slow inter connect show
a significant spinlock contention in skb_attempt_defer_free().

This series refactors this infrastructure to be NUMA aware,
and lockless.

Tested on various platforms, including AMD Zen 2/3/4
and Intel Granite Rapids, showing significant cost reductions
under network stress (more than 20 Mpps).

Eric Dumazet (3):
  net: make softnet_data.defer_count an atomic
  net: use llist for sd->defer_list
  net: add NUMA awareness to skb_attempt_defer_free()

 include/linux/netdevice.h |  6 +-----
 include/net/hotdata.h     |  7 +++++++
 net/core/dev.c            | 41 ++++++++++++++++++++++-----------------
 net/core/dev.h            |  2 +-
 net/core/skbuff.c         | 24 +++++++++++------------
 5 files changed, 43 insertions(+), 37 deletions(-)

-- 
2.51.0.536.g15c5d4f767-goog