netdev - Re: [PATCH net-next-2.6 v3] net

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Date:	Wed, 23 Feb 2011 17:13:20 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	David Miller <davem@...emloft.net>,
	Juliusz Chroboczek <Juliusz.Chroboczek@....jussieu.fr>,
	"John W. Linville" <linville@...driver.com>,
	Patrick McHardy <kaber@...sh.net>,
	netdev <netdev@...r.kernel.org>, Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH net-next-2.6 v3] net_sched: SFB flow scheduler

Le mercredi 23 février 2011 à 07:43 -0800, Stephen Hemminger a écrit :
> On Wed, 23 Feb 2011 16:14:51 +0100
> Eric Dumazet <eric.dumazet@...il.com> wrote:
> 
> > 1) SFB default child qdisc is pfifo_fast. It can be changed by another
> > qdisc but a child qdisc MUST not drop a packet previously queued. This
> > is because SFB needs to handle a dequeued packet in order to maintain
> > its virtual queue states. pfifo_head_drop or CHOKe should not be used.
> 
> Why not add a flag field to Qdisc_ops and to mark qdisc's that
> are (or not) work conserving?
> 

That was my initial idea, but have no idea how to implement it (outside
of fast path, I mean...)



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