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| author | David S. Miller <davem@davemloft.net> | 2018-01-19 15:39:31 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-01-19 15:39:31 -0500 |
| commit | 3c1693f012bdc0a9ff1bf030f7abc9961e94211f (patch) | |
| tree | f72181b7dfc5d58ee416a996028ea5c3698a206c /include | |
| parent | 60c2530696320ee6ffe4491c17079fa403790c98 (diff) | |
| parent | e42866031ff03c89a5bdd2056c76dd6cb41c3d35 (diff) | |
Merge branch 'tcp-min-rtt'
Yuchung Cheng says:
====================
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.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/tcp.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 6939e69d3c37..5a1d26a18599 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -953,6 +953,7 @@ struct rate_sample { u32 prior_in_flight; /* in flight before this ACK */ bool is_app_limited; /* is sample from packet with bubble in pipe? */ bool is_retrans; /* is sample from retransmission? */ + bool is_ack_delayed; /* is this (likely) a delayed ACK? */ }; struct tcp_congestion_ops { |