netdev - Re: [PATCH v4 net-next 16/16] tcp_bbr: add BBR congestion control

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Date:   Tue, 20 Sep 2016 19:42:00 -0400
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>, Van Jacobson <vanj@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>,
        Nandita Dukkipati <nanditad@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>
Subject: Re: [PATCH v4 net-next 16/16] tcp_bbr: add BBR congestion control

On Tue, Sep 20, 2016 at 7:39 PM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
>
>> NOTE: BBR *must* be used with the fq qdisc ("man tc-fq") with pacing
>> enabled, since pacing is integral to the BBR design and
>> implementation. BBR without pacing would not function properly, and
>> may incur unnecessary high packet loss rates.
>
> Does it work with fq_codel?

Good question. Since fq_codel does not (currently) implement pacing,
it would not be sufficient to get the required behavior.

neal