netdev - Re: [NET] Add proc file to display the state of all qdiscs.

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Date:	Thu, 03 Sep 2009 16:28:55 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hawk@...u.dk
Cc:	kaber@...sh.net, cl@...ux-foundation.org, eric.dumazet@...il.com,
	jarkao2@...il.com, netdev@...r.kernel.org
Subject: Re: [NET] Add proc file to display the state of all qdiscs.

From: Jesper Dangaard Brouer <hawk@...u.dk>
Date: Thu, 3 Sep 2009 19:30:00 +0200 (CEST)

> I especially like the possibility to access each qdisc seperately.
> Does it then support having seperate qdisc per TX queue?  (I'm toying
> with the idea of transmitting our multicast traffic into/via a
> seperate TX hardware queue, and making a special qdisc for IPTV
> MPEG2-TS shaping)

Indeed it sounds interesting.

But I want to warn everyone against adding support for anything
that adds a way to do operations "on every device qdisc" at the
kernel level.

I tried to do that and the error unwinding complexity is unacceptable.

We can make the tools support things like this.  Keep the kernel
simple and allow it to only operate on one queue at a time for
a given individual config request.

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