netdev - Re: [RFC PATCH net-next 09/15] net/sched: taprio: calculate guard band against actual TC gate close time

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Message-ID: <878rhmvp7g.fsf@kurt>
Date:   Sat, 28 Jan 2023 13:05:55 +0100
From:   Kurt Kanzenbach <kurt@...utronix.de>
To:     Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org
Cc:     Vinicius Costa Gomes <vinicius.gomes@...el.com>
Subject: Re: [RFC PATCH net-next 09/15] net/sched: taprio: calculate guard
 band against actual TC gate close time

On Sat Jan 28 2023, Vladimir Oltean wrote:
> taprio_dequeue_from_txq() looks at the entry->end_time to determine
> whether the skb will overrun its traffic class gate, as if at the end of
> the schedule entry there surely is a "gate close" event for it. Hint:
> maybe there isn't.
>
> For each schedule entry, introduce an array of kernel times which
> actually tracks when in the future will there be an *actual* gate close
> event for that traffic class, and use that in the guard band overrun
> calculation.
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Kurt Kanzenbach <kurt@...utronix.de>

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