https://github.com/torvalds/linux
Revision 0cfa5c07d6d1d7f8e710fc671c5ba1ce85e09fa4 authored by Yuchung Cheng on 30 May 2014, 22:25:59 UTC, committed by David S. Miller on 02 June 2014, 23:50:49 UTC
This bug is discovered by an recent F-RTO issue on tcpm list
https://www.ietf.org/mail-archive/web/tcpm/current/msg08794.html

The bug is that currently F-RTO does not use DSACK to undo cwnd in
certain cases: upon receiving an ACK after the RTO retransmission in
F-RTO, and the ACK has DSACK indicating the retransmission is spurious,
the sender only calls tcp_try_undo_loss() if some never retransmisted
data is sacked (FLAG_ORIG_DATA_SACKED).

The correct behavior is to unconditionally call tcp_try_undo_loss so
the DSACK information is used properly to undo the cwnd reduction.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 2d7a85f
History
Tip revision: 0cfa5c07d6d1d7f8e710fc671c5ba1ce85e09fa4 authored by Yuchung Cheng on 30 May 2014, 22:25:59 UTC
tcp: fix cwnd undo on DSACK in F-RTO
Tip revision: 0cfa5c0
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