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tcp: fix RTO calculated from cached RTT
Commit 1b7fdd2ab5
("tcp: do not use cached RTT for RTT estimation")
did not correctly account for the fact that crtt is the RTT shifted
left 3 bits. Fix the calculation to consistently reflect this fact.
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-By: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
4bdf259763
commit
269aa759b4
@ -502,7 +502,9 @@ reset:
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* ACKs, wait for troubles.
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*/
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if (crtt > tp->srtt) {
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inet_csk(sk)->icsk_rto = crtt + max(crtt >> 2, tcp_rto_min(sk));
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/* Set RTO like tcp_rtt_estimator(), but from cached RTT. */
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crtt >>= 3;
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inet_csk(sk)->icsk_rto = crtt + max(2 * crtt, tcp_rto_min(sk));
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} else if (tp->srtt == 0) {
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/* RFC6298: 5.7 We've failed to get a valid RTT sample from
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* 3WHS. This is most likely due to retransmission,
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