netdev - Re: [PATCH 1/1] net_sched: drr: warn when qdisc is not work conserving

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Date:	Thu, 12 Jun 2014 18:03:08 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Florian Westphal <fw@...len.de>, netdev@...r.kernel.org
Subject: Re: [PATCH 1/1] net_sched: drr: warn when qdisc is not work conserving

On 11. Juni 2014 20:35:18 MESZ, Florian Westphal <fw@...len.de> wrote:
>The DRR scheduler requires that items on the active list are work
>conserving, i.e. do not hold on to skbs for throttling purposes, etc.
>Attaching e.g. tbf renders DRR useless because all other classes on the
>active list are delayed as well.
>
>So, warn users that this configuration won't work as expected; we
>already do this in couple of other qdiscs, see e.g.

Why don't prevent this during configuration time in the first place? It doesn't work, a warning might trigger long after creating the broken configuration and will more likely go unnoticed.

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