tcp: record most recent RTT in RACK loss detection

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Record the most recent RTT in RACK. It is often identical to the
"ca_rtt_us" values in tcp_clean_rtx_queue. But when the packet has
been retransmitted, RACK choses to believe the ACK is for the
(latest) retransmitted packet if the RTT is over minimum RTT.

This requires passing the arrival time of the most recent ACK to
RACK routines. The timestamp is now recorded in the "ack_time"
in tcp_sacktag_state during the ACK processing.

This patch does not change the RACK algorithm itself. It only adds
the RTT variable to prepare the next main patch.

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 22:11:32 -08:00 • committed by David S. Miller

parent e636f8b010

commit deed7be78f

4 changed files with 50 additions and 35 deletions

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1

include/linux/tcp.h

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7

include/net/tcp.h

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36

net/ipv4/tcp_input.c

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41

net/ipv4/tcp_recovery.c

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