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

From: "Tomas Winkler" <redacted>
Date: Sun, 20 Jul 2008 20:34:18 +0300

On Sun, Jul 20, 2008 at 8:25 PM, David Miller [off-list ref] wrote:

quoted

From: jamal <hadi-fAAogVwAN2Kw5LPnMra/2Q@public.gmane.org>
Date: Sun, 20 Jul 2008 11:16:03 -0400

quoted

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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