netdev - Re: [PATCH net] tcp: fix SYNACK RTT estimation in Fast Open

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Message-ID: <CADVnQymY0C=awBucRiePAy04ZYK5SW68aNjEYrpF87BAhN79+w@mail.gmail.com>
Date:	Thu, 24 Oct 2013 13:02:13 -0400
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, panweiping3@...il.com,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] tcp: fix SYNACK RTT estimation in Fast Open

On Thu, Oct 24, 2013 at 11:44 AM, Yuchung Cheng <ycheng@...gle.com> wrote:
> tp->lsndtime may not always be the SYNACK timestamp if a passive
> Fast Open socket sends data before handshake completes. And if the
> remote acknowledges both the data and the SYNACK, the RTT sample
> is already taken in tcp_ack(), so no need to call
> tcp_update_ack_rtt() in tcp_synack_rtt_meas() aagain.
>
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> ---
>  net/ipv4/tcp_input.c | 18 +++++++++++++-----
>  1 file changed, 13 insertions(+), 5 deletions(-)

Acked-by: Neal Cardwell <ncardwell@...gle.com>

neal
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