netdev - Re: [PATCH 3/3] pkt_sched: restore multiqueue prio scheduler

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Message-Id: <20080824.175026.237775292.davem@davemloft.net>
Date:	Sun, 24 Aug 2008 17:50:26 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jarkao2@...il.com
Cc:	hadi@...erus.ca, alexander.duyck@...il.com,
	jeffrey.t.kirsher@...el.com, jeff@...zik.org,
	netdev@...r.kernel.org, alexander.h.duyck@...el.com
Subject: Re: [PATCH 3/3] pkt_sched: restore multiqueue prio scheduler

From: Jarek Poplawski <jarkao2@...il.com>
Date: Sun, 24 Aug 2008 21:27:34 +0200

> On Sun, Aug 24, 2008 at 09:19:05PM +0200, Jarek Poplawski wrote:
> ...
> > Jamal, maybe I miss something, but this could be like this only with
> > default pfifo_fast qdiscs, which really are per dev hwqueue. Other
> > qdiscs, including prio, are per device, so with prio, if a band with
> > the highest priority is blocked it would be requeued blocking other
> > bands (hwqueues in Alexander's case).
> 
> And, actually, because of this, Alexander is right the prio_dequeue()
> can't work like this without any changes.

Yes it can, see my other response.  Only the higher priority
queues filling up can block lower priority traffic, and that
is fine.

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