netdev - Re: [PATCH net-next-2.6 v4] net

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Date:	Thu, 24 Feb 2011 06:40:35 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	Juliusz.Chroboczek@....jussieu.fr, linville@...driver.com,
	shemminger@...tta.com, kaber@...sh.net, netdev@...r.kernel.org,
	andi@...stfloor.org
Subject: Re: [PATCH net-next-2.6 v4] net_sched: SFB flow scheduler

Le mercredi 23 février 2011 à 14:06 -0800, David Miller a écrit :
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Wed, 23 Feb 2011 21:56:17 +0100
> 
> > This is the Stochastic Fair Blue scheduler, based on work from :
> 
> Applied with the 'static' fix, thanks Eric!

Thanks David !

My next step is to expand the idea I had some time ago (with my SFQ
works in december) :

Add a generic (core) service :

- Timestamp skb when it enters qdisc (might use skb->tstamp ?)
- At dequeue time, compute the delay.

1) Be able to mark/drop the packet right before giving it to device if
delay above a threshold, or use an array of thresholds depending on TOS

2) Integrate the delay into one EWMA

3) For SFB : Use the EWMA to eventually replace the non convenient
penalty_box by auto adaptative mechanism : Allow non elastic flows to
take part of the bandwidth, using a drop/mark probability depending on
this EWMA.



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