netdev - Re: [PATCH net-next v2 0/6] RED: Introduce an ECN tail-dropping mode

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Message-Id: <20200314.210402.573725635566592048.davem@davemloft.net>
Date:   Sat, 14 Mar 2020 21:04:02 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     petrm@...lanox.com
Cc:     netdev@...r.kernel.org, kuba@...nel.org, mrv@...atatu.com,
        jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...lanox.com,
        mlxsw@...lanox.com
Subject: Re: [PATCH net-next v2 0/6] RED: Introduce an ECN tail-dropping
 mode

From: Petr Machata <petrm@...lanox.com>
Date: Wed, 11 Mar 2020 19:33:50 +0200

> When the RED qdisc is currently configured to enable ECN, the RED algorithm
> is used to decide whether a certain SKB should be marked. If that SKB is
> not ECN-capable, it is early-dropped.
> 
> It is also possible to keep all traffic in the queue, and just mark the
> ECN-capable subset of it, as appropriate under the RED algorithm. Some
> switches support this mode, and some installations make use of it.
> There is currently no way to put the RED qdiscs to this mode.
> 
> Therefore this patchset adds a new RED flag, TC_RED_TAILDROP. When the
> qdisc is configured with this flag, non-ECT traffic is enqueued (and
> tail-dropped when the queue size is exhausted) instead of being
> early-dropped.
 ...

Series applied, thank you.