netdev - Re: [PATCH v2 3/3] RFC tcp: early retransmit: delayed fast retransmit

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Message-ID: <CADVnQym=5RLNS6A2stNtan56na9U+280_qFGtmjos0jcK9nAcg@mail.gmail.com>
Date:	Tue, 1 May 2012 13:55:11 -0400
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	davem@...emloft.net, ilpo.jarvinen@...sinki.fi,
	nanditad@...gle.com, edumazet@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2 3/3] RFC tcp: early retransmit: delayed fast retransmit

On Sat, Apr 28, 2012 at 2:46 PM, Yuchung Cheng <ycheng@...gle.com> wrote:
> Implementing the advanced early retransmit (sysctl_tcp_early_retrans==2).
> Delays the fast retransmit by an interval of RTT/4. We borrow the
> RTO timer to implement the delay. If we receive another ACK or send
> a new packet, the timer is cancelled and restored to original RTO
> value offset by time elapsed.  When the delayed-ER timer fires,
> we enter fast recovery and perform fast retransmit.
>
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> ---
>  include/linux/tcp.h   |    4 +-
>  include/net/tcp.h     |    3 ++
>  net/ipv4/tcp_input.c  |   69 ++++++++++++++++++++++++++++++++++++++++++++-----
>  net/ipv4/tcp_output.c |    5 +--
>  net/ipv4/tcp_timer.c  |    5 +++
>  5 files changed, 74 insertions(+), 12 deletions(-)

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

neal
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