netdev - [PATCH RFC net-next 0/4] net: deal with strange attractors tx queues

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Message-ID: <20251008104612.1824200-1-edumazet@google.com>
Date: Wed,  8 Oct 2025 10:46:07 +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 RFC net-next 0/4] net: deal with strange attractors tx queues

Back 2010, Tom Herbert added skb->ooo_okay to TCP flows.

Extend the feature to connected flows for other protocols like UDP.

skb->ooo_okay might never be set for bulk flows that always
have at least one skb in a qdisc queue of NIC queue,
especially if TX completion is delayed because of a stressed cpu.

The so-called "strange attractors" has caused many performance
issues, we need to do better now that TCP deals better with
potential reorders.

Add new net.core.txq_reselection_ms sysctl to let
flows follow XPS and select a more efficient queue.

After this series, we no longer have to make sure threads
are pinned to cpus, they now can be migrated without
adding too much spinlock/qdisc/TX completion pressure anymore.

Eric Dumazet (4):
  net: add SK_WMEM_ALLOC_BIAS constant
  net: control skb->ooo_okay from skb_set_owner_w()
  net: add /proc/sys/net/core/txq_reselection_ms control
  net: allow busy connected flows to switch tx queues

 Documentation/admin-guide/sysctl/net.rst | 15 +++++++++
 include/net/netns/core.h                 |  1 +
 include/net/sock.h                       | 43 ++++++++++++------------
 net/atm/common.c                         |  2 +-
 net/core/dev.c                           | 27 +++++++++++++--
 net/core/net_namespace.c                 |  1 +
 net/core/sock.c                          | 17 +++++++---
 net/core/sysctl_net_core.c               |  7 ++++
 8 files changed, 84 insertions(+), 29 deletions(-)

-- 
2.51.0.710.ga91ca5db03-goog