netdev - Re: [PATCH net-next] tcp: send loss probe after 1s if no RTT available

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Message-Id: <20150921.161919.1105069799353968079.davem@davemloft.net>
Date:	Mon, 21 Sep 2015 16:19:19 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ycheng@...gle.com
Cc:	netdev@...r.kernel.org, nanditad@...gle.com, ncardwell@...gle.com,
	edumazet@...gle.com
Subject: Re: [PATCH net-next] tcp: send loss probe after 1s if no RTT
 available

From: Yuchung Cheng <ycheng@...gle.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 <ycheng@...gle.com>
> Signed-off-by: Nandita Dukkipati <nanditad@...gle.com>
> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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