netdev - Re: [PATCH v2] net: sch_generic: Use pfifo_fast as fallback scheduler for CAN hardware

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Date:   Tue, 22 Oct 2019 10:28:26 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     Vincent Prince <vincent.prince.fr@...il.com>, jiri@...nulli.us,
        jhs@...atatu.com, netdev@...r.kernel.org, dave.taht@...il.com,
        linux-can@...r.kernel.org, kernel@...gutronix.de,
        xiyou.wangcong@...il.com, davem@...emloft.net
Subject: Re: [PATCH v2] net: sch_generic: Use pfifo_fast as fallback scheduler
 for CAN hardware

On 10/22/19 9:42 AM, Stephen Hemminger wrote:

> Why not fix fq_codel to return the same errors as other qdisc?
> 

I believe the same problem would happen with any qdisc not doing tail drops.

Do we really want to enforce all qdisc to have a common drop strategy ?

For example, FQ could implement a strategy dropping the oldest packet in the queue,
which is absolutely not related to the enqueue order.