netdev - [PATCH net-next 0/3] tcp: take a bit more care of backlog stress

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Message-Id: <20181121175240.6075-1-edumazet@google.com>
Date:   Wed, 21 Nov 2018 09:52:37 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Jean-Louis Dupond <jean-louis@...ond.be>,
        Neal Cardwell <ncardwell@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 0/3] tcp: take a bit more care of backlog stress

While working on the SACK compression issue Jean-Louis Dupond
reported, we found that his linux box was suffering very hard
from tail drops on the socket backlog queue, because the opposite
TCP stack was ont implementing latest RFC recommendations.

First patch is a cleanup

Second patch is attempting coalescing when a new packet must
be added to the backlog queue. Cooking bigger skbs helps
to keep backlog list smaller and speeds its handling when
user thread finally releases the socket lock.

Third patch is implementing head drop as a last resort.
Head drops are generally better for optimal TCP behavior.

Eric Dumazet (3):
  tcp: remove hdrlen argument from tcp_queue_rcv()
  tcp: implement coalescing on backlog queue
  tcp: implement head drops in backlog queue

 include/uapi/linux/snmp.h |  1 +
 net/ipv4/proc.c           |  1 +
 net/ipv4/tcp_input.c      | 13 +++---
 net/ipv4/tcp_ipv4.c       | 89 ++++++++++++++++++++++++++++++++++++---
 4 files changed, 91 insertions(+), 13 deletions(-)

-- 
2.19.1.1215.g8438c0b245-goog