netdev - Re: [PATCH net-next] tcp: reset timer after any SYNACK retransmit

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Message-ID: <1367261659.8964.332.camel@edumazet-glaptop>
Date:	Mon, 29 Apr 2013 11:54:19 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	davem@...emloft.net, ncardwell@...gle.com, edumazet@...gle.com,
	hagen@...u.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tcp: reset timer after any SYNACK retransmit

On Mon, 2013-04-29 at 11:44 -0700, Yuchung Cheng wrote:
> Linux immediately returns SYNACK on (spurious) SYN retransmits, but
> keeps the SYNACK timer running independently. Thus the timer may
> fire right after the SYNACK retransmit and causes a SYN-SYNACK
> cross-fire burst.
> 
> Adopt the fast retransmit/recovery idea in established state by
> re-arming the SYNACK timer after the fast (SYNACK) retransmit. The
> timer may fire late up to 500ms due to the current SYNACK timer wheel,
> but it's OK to be conservative when network is congested. Eric's new
> listener design should address this issue.
> 
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> ---

Acked-by: Eric Dumazet <edumazet@...gle.com>


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