netdev - RE: [PATCH iproute2-next] taprio: Add support for the SetAndHold and SetAndRelease commands

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Message-ID: <157835635771.12437.5922951778370014410@aguedesl-mac01.jf.intel.com>
Date:   Mon, 06 Jan 2020 16:19:17 -0800
From:   Andre Guedes <andre.guedes@...ux.intel.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>
Cc:     Joao Pinto <Joao.Pinto@...opsys.com>,
        David Ahern <dsahern@...il.com>
Subject: RE: [PATCH iproute2-next] taprio: Add support for the SetAndHold and SetAndRelease commands

Hi Jose,

Quoting Jose Abreu (2019-12-18 15:08:45)
> From: Vinicius Costa Gomes <vinicius.gomes@...el.com>
> Date: Dec/18/2019, 23:05:13 (UTC+00:00)
> 
> > However, I feel that this is incomplete. At least the way I understand
> > things, without specifying which traffic classes are going to be
> > preemptible (or it's dual concept, express), I don't see how this is
> > going to be used in practice. Or does the hardware have a default
> > configuration, that all traffic classes are preemptible, for example.
> > 
> > What am I missing here?
> 
> On our IPs Queue 0 is by preemptible and all remaining ones are express 
> by default.

Is this configuration fixed in your IP or the user can control if a specific
queue is preemptible or express?

I'm trying to figure out how this discussion relates to the Qbu discussion
we're having in "[v1,net-next, 1/2] ethtool: add setting frame preemption of
traffic classes".

Regards,

Andre