netdev - Re: [PATCH net-next] fq_codel: report congestion notification at enqueue time

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Date:	Fri, 29 Jun 2012 06:53:12 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>, Dave Taht <dave.taht@...il.com>,
	codel@...ts.bufferbloat.net, Tom Herbert <therbert@...gle.com>,
	Matt Mathis <mattmathis@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	Nandita Dukkipati <nanditad@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>
Subject: Re: [PATCH net-next] fq_codel: report congestion notification at
 enqueue time

On Thu, 2012-06-28 at 19:07 +0200, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> At enqueue time, check sojourn time of packet at head of the queue,
> and return NET_XMIT_CN instead of NET_XMIT_SUCCESS if this sejourn
> time is above codel @target.
> 
> This permits local TCP stack to call tcp_enter_cwr() and reduce its cwnd
> without drops (for example if ECN is not enabled for the flow)
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Dave Taht <dave.taht@...ferbloat.net>
> Cc: Tom Herbert <therbert@...gle.com>
> Cc: Matt Mathis <mattmathis@...gle.com>
> Cc: Yuchung Cheng <ycheng@...gle.com>
> Cc: Nandita Dukkipati <nanditad@...gle.com>
> Cc: Neal Cardwell <ncardwell@...gle.com>
> ---

Please dont apply this patch, I'll submit an updated version later.

Thanks


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