netdev - [PATCH v2 net-next 0/2] tcp: tcp_rcvbuf

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Message-ID: <20251119084813.3684576-1-edumazet@google.com>
Date: Wed, 19 Nov 2025 08:48:11 +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>, Neal Cardwell <ncardwell@...gle.com>, 
	Kuniyuki Iwashima <kuniyu@...gle.com>, Rick Jones <jonesrick@...gle.com>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v2 net-next 0/2] tcp: tcp_rcvbuf_grow() changes

First pach is minor and moves tcp_moderate_rcvbuf in appropriate group.

Second patch is another attempt to keep small sk->sk_rcvbuf for DC
(small RT) TCP flows for optimal performance.

Eric Dumazet (2):
  tcp: tcp_moderate_rcvbuf is only used in rx path
  tcp: add net.ipv4.tcp_rcvbuf_low_rtt sysctl

 Documentation/networking/ip-sysctl.rst         | 10 ++++++++++
 .../net_cachelines/netns_ipv4_sysctl.rst       |  3 ++-
 include/net/netns/ipv4.h                       |  3 ++-
 net/core/net_namespace.c                       | 11 ++++-------
 net/ipv4/sysctl_net_ipv4.c                     |  9 +++++++++
 net/ipv4/tcp_input.c                           | 18 ++++++++++++++----
 net/ipv4/tcp_ipv4.c                            |  1 +
 7 files changed, 42 insertions(+), 13 deletions(-)

-- 
2.52.0.rc1.455.g30608eb744-goog