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

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Message-ID: <20080824201805.GA3515@ami.dom.local>
Date:	Sun, 24 Aug 2008 22:18:05 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	jamal <hadi@...erus.ca>
Cc:	Alexander Duyck <alexander.duyck@...il.com>,
	David Miller <davem@...emloft.net>,
	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

On Sun, Aug 24, 2008 at 09:59:14PM +0200, Jarek Poplawski wrote:
> On Sun, Aug 24, 2008 at 09:27:34PM +0200, Jarek Poplawski wrote:
> > 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.
> 
> ...And it looks like it's not only about prio with queue remapping.
> Similar fixes are probably needed by default to any other qdiscs
> implementing priorities, like htb etc!

...Or even more: simple fifos need this, as well!!

Jarek P.
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