netdev - [PATCH 0/2 net-next] tcp: do not use RTT from delayed ACKs for min-RTT

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Date:   Wed, 17 Jan 2018 12:10:59 -0800
From:   Yuchung Cheng <ycheng@...gle.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, ncardwell@...gle.com,
        soheil@...gle.com, Yuchung Cheng <ycheng@...gle.com>
Subject: [PATCH 0/2 net-next] tcp: do not use RTT from delayed ACKs for min-RTT

This patch set prevents TCP sender from using RTT samples from
(suspected) delayed ACKs as the minimum RTT, to avoid unbounded
over-estimation of the network path delay. This issue is common
when a connection has extended periods of one packet chit-chat
beyond the min RTT filter window. The first patch does that for TCP
general min RTT estimation. The second patch addresses specifically
the BBR congestion control's min RTT filter.

Yuchung Cheng (2):
  tcp: avoid min-RTT overestimation from delayed ACKs
  tcp: avoid min RTT bloat by skipping RTT from delayed-ACK in BBR

 include/net/tcp.h    |  1 +
 net/ipv4/tcp_bbr.c   |  3 ++-
 net/ipv4/tcp_input.c | 24 ++++++++++++++++++++++--
 3 files changed, 25 insertions(+), 3 deletions(-)

-- 
2.16.0.rc1.238.g530d649a79-goog