netdev - Re: [PATCH 20/31]: pkt_sched: Perform bulk of qdisc destruction in RCU.

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Message-Id: <20080720.103546.238638632.davem@davemloft.net>
Date:	Sun, 20 Jul 2008 10:35:46 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	tomasw@...il.com
Cc:	hadi@...erus.ca, kaber@...sh.net, netdev@...r.kernel.org,
	johannes@...solutions.net, linux-wireless@...r.kernel.org
Subject: Re: [PATCH 20/31]: pkt_sched: Perform bulk of qdisc destruction in
 RCU.

From: "Tomas Winkler" <tomasw@...il.com>
Date: Sun, 20 Jul 2008 20:34:18 +0300

> On Sun, Jul 20, 2008 at 8:25 PM, David Miller <davem@...emloft.net> wrote:
> > From: jamal <hadi@...erus.ca>
> > Date: Sun, 20 Jul 2008 11:16:03 -0400
> >
> >> IMO, in the case of multiple hardware queues per physical wire,
> >> and such a netdevice already has a built-in hardware scheduler (they all
> >> seem to have this feature) then if we can feed the hardware queues
> >> directly, theres no need for any intermediate buffer(s).
> >> In such a case, to compare with qdisc arch, its like the root qdisc is
> >> in hardware.
> >
> > They tend to implement round-robin or some similar fairness algorithm
> > amongst the queues, with zero concern about packet priorities.
> >
> > It really is just like a bunch of queues to the phsyical layer,
> > fairly shared.
> >
> > These things are built for parallelization, not prioritization.
> 
> Except wireless where HW has prioritizing scheduler per physical non-wire.
> Tomas

I know that.  We're talking about multiqueue ethernet NICs.
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