netdev - Re: SFQ on HFSC leaf does not seem to work

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Message-ID: <1324656963.4540.10.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Fri, 23 Dec 2011 17:16:03 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"John A. Sullivan III" <jsullivan@...nsourcedevel.com>
Cc:	netdev@...r.kernel.org
Subject: Re: SFQ on HFSC leaf does not seem to work

Le vendredi 23 décembre 2011 à 10:26 -0500, John A. Sullivan III a
écrit :

> Yes.  This is a problem I have with netem on ingress traffic.  I use the
> filter on ffff: to redirect to ifb0 for the ingress traffic shaping.  I
> cannot figure out a way to redirect a second time to ifb1 for the netem
> qdisc.  I tried putting two action mirred statements in the filter but
> that did not work.  Unlike eth1, I cannot attach a filter further down
> the ifb0 hfsc hierarchy because one can't redirect one ifb into another
> ifb.  Thus, the only way I could figure out how to do inbound netem was
> to replace the terminal qdisc with netem rather than SFQ.  I'd love to
> be able to do that differently.  I tried attaching netem to the SFQ but
> that failed (I assume because SFQ is classless) and I tried the other
> way around, attaching SFQ to netem since you mentioned netem could take
> a class but that did not work either.

Unfortunately, netem wants to control skbs itself, in a fifo queue.

To implement what you want, we would need to setup a second qdisc,
and when packets are dequeued from internal netem fifo, queue them in
second qdisc.

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