netdev - Re: IFB and bridges

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Date:	Sun, 11 Dec 2011 23:00:59 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"John A. Sullivan III" <jsullivan@...nsourcedevel.com>
Cc:	netdev@...r.kernel.org
Subject: Re: IFB and bridges

Le dimanche 11 décembre 2011 à 17:38 -0500, John A. Sullivan III a > 
> I know IFB is often used for ingress but I wasn't really thinking of
> ingress filtering.  Let's say I have a 12 port Linux switch.  If any
> of the ports become backlogged, I want them to prioritize time
> sensitive traffic so I implement traffic shaping but I don't want to
> have to define my qdiscs, classes, and filters 12 times over if they
> are all the same.  So I would direct each port to an IFB (not sure if
> that's intolerable overhead), have a single set of qdiscs, classes,
> and filters, and, once those are applied, the packet arrives back on
> the same interface and proceeds assuming if has not been dropped or
> delayed. - John

Really ? How are you going to shape a single IFB device, if you really
have independant 12 ports. (Its a switch, not a hub after all)

A script can define your qdiscs/classes/filters hundred times, or one
thousand times, and writing such a script is far more easier than setup
IFB.

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