netdev - Re: [PATCH net-next] net_sched: sch

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Date:   Sun, 11 Nov 2018 13:50:58 -0500
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH net-next] net_sched: sch_fq: add dctcp-like marking

On Sun, Nov 11, 2018 at 12:11 PM Eric Dumazet <edumazet@...gle.com> wrote:
>
> Similar to 80ba92fa1a92 ("codel: add ce_threshold attribute")
>
> After EDT adoption, it became easier to implement DCTCP-like CE marking.
>
> In many cases, queues are not building in the network fabric but on
> the hosts themselves.
>
> If packets leaving fq missed their Earliest Departure Time by XXX usec,
> we mark them with ECN CE. This gives a feedback (after one RTT) to
> the sender to slow down and find better operating mode.
>
> Example :
>
> tc qd replace dev eth0 root fq ce_threshold 2.5ms
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---

Very nice! Thanks, Eric. :-)

Acked-by: Neal Cardwell <ncardwell@...gle.com>

neal