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Date:   Fri, 17 Jan 2020 15:47:04 -0800
From:   Vinicius Costa Gomes <>
To:     Murali Karicheri <>,
        Ivan Khoronzhuk <>
Cc:     Po Liu <>,
        Andre Guedes <>,
        "alexandru.ardelean\" <>,
        "allison\" <>,
        "andrew\" <>,
        "ayal\" <>,
        "davem\" <>,
        "f.fainelli\" <>,
        "gregkh\" <>,
        "hauke.mehrtens\" <>,
        "hkallweit1\" <>,
        "jiri\" <>,
        "linux-kernel\" <>,
        "netdev\" <>,
        "pablo\" <>,
        "saeedm\" <>,
        "tglx\" <>,
        Vladimir Oltean <>,
        "simon.horman\" <>,
        Claudiu Manoil <>,
        Alexandru Marginean <>,
        Xiaoliang Yang <>,
        Roy Zang <>, Mingkai Hu <>,
        Jerry Huang <>, Leo Li <>
Subject: Re: [EXT] Re: [v1,net-next, 1/2] ethtool: add setting frame preemption of traffic classes


Murali Karicheri <> writes:


>>> 2) What if I want to use frame preemption with another "transmission selection
>>> algorithm"? Say another one "time sensitive" - CBS? How is it going to be
>>> stacked?
>> I am not seeing any (conceptual*) problems when plugging a cbs (for
>> example) qdisc into one of taprio children. Or, are you talking about a
>> more general problem?
> If I understand it correctly problem is not stacking taprio with cbs,
> but rather pre-emption with other qdiscs and allow configuring
> the parameters such as frag size. How do I use frame pre-emption as
> an independent feature and configure frag size? Ethool appears to be
> better from this point of view as Ivan has mentioned below.

Yeah, after all the discussion here, I think we came to the rough
consensus that ethtool is the best place we have to enable/disable frame
preemption and its configuration knobs.

I just have a few comments to add to the series (sorry for the long


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