netdev - [PATCH net-next 0/2] tcp: exponential backoff in tcp_send

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Message-Id: <20200930125457.1579469-1-eric.dumazet@gmail.com>
Date:   Wed, 30 Sep 2020 05:54:55 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        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 0/2] tcp: exponential backoff in tcp_send_ack()

From: Eric Dumazet <edumazet@...gle.com>

We had outages caused by repeated skb allocation failures in tcp_send_ack()

It is time to add exponential backoff to reduce number of attempts.
Before doing so, first patch removes icsk_ack.blocked to make
room for a new field (icsk_ack.retry)

Eric Dumazet (2):
  inet: remove icsk_ack.blocked
  tcp: add exponential backoff in __tcp_send_ack()

 include/net/inet_connection_sock.h |  5 +++--
 net/dccp/timer.c                   |  1 -
 net/ipv4/inet_connection_sock.c    |  2 +-
 net/ipv4/tcp.c                     |  6 ++----
 net/ipv4/tcp_output.c              | 18 ++++++++++--------
 net/ipv4/tcp_timer.c               |  1 -
 6 files changed, 16 insertions(+), 17 deletions(-)

-- 
2.28.0.806.g8561365e88-goog