From: Yuchung Cheng <ych...@google.com>
Date: Fri, 18 Sep 2015 11:40:33 -0700

> This patch makes TLP to use 1 sec timer by default when RTT is
> not available due to SYN/ACK retransmission or SYN cookies.
> 
> Prior to this change, the lack of RTT prevents TLP so the first
> data packets sent can only be recovered by fast recovery or RTO.
> If the fast recovery fails to trigger the RTO is 3 second when
> SYN/ACK is retransmitted. With this patch we can trigger fast
> recovery in 1sec instead.
> 
> Note that we need to check Fast Open more properly. A Fast Open
> connection could be (accepted then) closed before it receives
> the final ACK of 3WHS so the state is FIN_WAIT_1. Without the
> new check, TLP will retransmit FIN instead of SYN/ACK.
> 
> Signed-off-by: Yuchung Cheng <ych...@google.com>
> Signed-off-by: Nandita Dukkipati <nandi...@google.com>
> Signed-off-by: Neal Cardwell <ncardw...@google.com>
> Signed-off-by: Eric Dumazet <eduma...@google.com>

Applied.
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