netdev - Re: [PATCH v4 3/3] tcp: early retransmit: delayed fast retransmit

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Message-ID: <CADVnQy=cYPN20JjG47VjsfH12dq7T7-LC0z0XUWhBCo8SCo2cg@mail.gmail.com>
Date:	Wed, 2 May 2012 20:15:19 -0400
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	davem@...emloft.net, ilpo.jarvinen@...sinki.fi,
	nanditad@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH v4 3/3] tcp: early retransmit: delayed fast retransmit

On Wed, May 2, 2012 at 7:30 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>
> ---
> ChangeLog in v2:
>  - Set sysctl_tcp_early_retrans default to 2
> ChangeLog in v3:
>  - use separate u8 for early retrans stats in tcp_sock
>  - disable ER if detects any reordering
> ChangeLog in v4:
>  - move disabling ER code on reordering into part2

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

neal
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