netdev - Re: [RFC] [PATCH] Don't run __qdisc

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Date:	Tue, 28 Jul 2009 13:02:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	jarkao2@...il.com, krkumar2@...ibm.com, netdev@...r.kernel.org
Subject: Re: [RFC] [PATCH] Don't run __qdisc_run() on a stopped TX queue

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Tue, 28 Jul 2009 16:44:51 +0800

> Well the fact that as it stands the only true multiqueue qdisc
> is the default is a mere coincidence.  There is no fundamental
> reason why non-default qdiscs cannot be made multiqueue aware,
> well, for some of them anyway.
> 
> For example, sfq can naturally be enhanced as a multiqueue qdisc
> just like the default qdisc.
> 
> So I don't think we want to prejudice what a future non-default
> qdisc may support.

The idea is that it cannot be done anywhere we currently
limits, decisions, etc. are all done with "device" scope.

And I think SFQ even falls into that category.

You would need a special SFQ that makes sure to break down traffic
identically to how the TX queue selection divides traffic, and even
then I'm not even so sure how implementable that is.
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