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

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Message-ID: <20110223074305.755c5713@nehalam>
Date:	Wed, 23 Feb 2011 07:43:05 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Eric Dumazet <eric.dumazet@...il.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

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?

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