netdev - [PATCH net 0/2] tcp_cubic: fix spurious HYSTART

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Date:   Wed, 24 Jun 2020 12:42:01 -0400
From:   Neal Cardwell <ncardwell@...gle.com>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Neal Cardwell <ncardwell@...gle.com>
Subject: [PATCH net 0/2] tcp_cubic: fix spurious HYSTART_DELAY on RTT decrease

This series fixes a long-standing bug in the TCP CUBIC
HYSTART_DELAY mechanim recently reported by Mirja Kuehlewind. The
code can cause a spurious exit of slow start in some particular
cases: upon an RTT decrease that happens on the 9th or later ACK
in a round trip. This series fixes the original Hystart code and
also the recent BPF implementation.

Neal Cardwell (2):
  tcp_cubic: fix spurious HYSTART_DELAY exit upon drop in min RTT
  bpf: tcp: bpf_cubic: fix spurious HYSTART_DELAY exit upon drop in min
    RTT

 net/ipv4/tcp_cubic.c                          | 5 ++---
 tools/testing/selftests/bpf/progs/bpf_cubic.c | 5 ++---
 2 files changed, 4 insertions(+), 6 deletions(-)

-- 
2.27.0.111.gc72c7da667-goog