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tcp: remove early retransmit

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This patch removes the support of RFC5827 early retransmit (i.e.,
fast recovery on small inflight with <3 dupacks) because it is
subsumed by the new RACK loss detection. More specifically when
RACK receives DUPACKs, it'll arm a reordering timer to start fast
recovery after a quarter of (min)RTT, hence it covers the early
retransmit except RACK does not limit itself to specific inflight
or dupack numbers.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuchung Cheng
2017-01-12 22:11:39 -08:00
committed by David S. Miller
parent 840a3cbe89
commit bec41a11dd
12 changed files with 12 additions and 111 deletions
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3
net/ipv4/tcp_timer.c
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@@ -566,9 +566,6 @@ void tcp_write_timer_handler(struct sock *sk)
case ICSK_TIME_REO_TIMEOUT:
tcp_rack_reo_timeout(sk);
break;
case ICSK_TIME_EARLY_RETRANS:
tcp_resume_early_retransmit(sk);
break;
case ICSK_TIME_LOSS_PROBE:
tcp_send_loss_probe(sk);
break;