netdev - Re: [PATCH iproute2-next v11] Add support for CAKE qdisc

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Message-ID: <b1dc9305-ff72-d84a-aacf-3a7a69ea6b7c@gmail.com>
Date:   Thu, 19 Jul 2018 10:25:17 -0600
From:   David Ahern <dsahern@...il.com>
To:     Toke Høiland-Jørgensen <toke@...e.dk>,
        netdev@...r.kernel.org
Cc:     cake@...ts.bufferbloat.net, Dave Taht <dave.taht@...il.com>
Subject: Re: [PATCH iproute2-next v11] Add support for CAKE qdisc

On 7/19/18 7:56 AM, Toke Høiland-Jørgensen wrote:
> sch_cake is intended to squeeze the most bandwidth and latency out of even
> the slowest ISP links and routers, while presenting an API simple enough
> that even an ISP can configure it.
> 
> Example of use on a cable ISP uplink:
> 
> tc qdisc add dev eth0 cake bandwidth 20Mbit nat docsis ack-filter
> 
> To shape a cable download link (ifb and tc-mirred setup elided)
> 
> tc qdisc add dev ifb0 cake bandwidth 200mbit nat docsis ingress wash besteffort
> 
> Cake is filled with:
> 
> * A hybrid Codel/Blue AQM algorithm, "Cobalt", tied to an FQ_Codel
>   derived Flow Queuing system, which autoconfigures based on the bandwidth.
> * A novel "triple-isolate" mode (the default) which balances per-host
>   and per-flow FQ even through NAT.
> * An deficit based shaper, that can also be used in an unlimited mode.
> * 8 way set associative hashing to reduce flow collisions to a minimum.
> * A reasonable interpretation of various diffserv latency/loss tradeoffs.
> * Support for zeroing diffserv markings for entering and exiting traffic.
> * Support for interacting well with Docsis 3.0 shaper framing.
> * Support for DSL framing types and shapers.
> * Support for ack filtering.
> * Extensive statistics for measuring, loss, ecn markings, latency variation.
> 
> Various versions baking have been available as an out of tree build for
> kernel versions going back to 3.10, as the embedded router world has been
> running a few years behind mainline Linux. A stable version has been
> generally available on lede-17.01 and later.
> 
> sch_cake replaces a combination of iptables, tc filter, htb and fq_codel
> in the sqm-scripts, with sane defaults and vastly simpler configuration.
> 
> Cake's principal author is Jonathan Morton, with contributions from
> Kevin Darbyshire-Bryant, Toke Høiland-Jørgensen, Sebastian Moeller,
> Ryan Mounce, Tony Ambardar, Dean Scarff, Nils Andreas Svee, Dave Täht,
> and Loganaden Velvindron.
> 
> Testing from Pete Heist, Georgios Amanakis, and the many other members of
> the cake@...ts.bufferbloat.net mailing list.
> 
> Signed-off-by: Dave Taht <dave.taht@...il.com>
> Signed-off-by: Toke Høiland-Jørgensen <toke@...e.dk>
> ---

applied to iproute2-next. Thanks

About the autorate, I think you should consider consistency in output.