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Re: [tsvwg] ECN encapsulation draft - proposed resolution

Sebastian Moeller <moeller0@gmx.de> Wed, 23 June 2021 09:02 UTC

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From: Sebastian Moeller <moeller0@gmx.de>
In-Reply-To: <11605D97-0764-4E6F-9022-A0318E9D5BA1@gmail.com>
Date: Wed, 23 Jun 2021 11:02:18 +0200
Cc: "Rodney W. Grimes" <ietf@gndrsh.dnsmgr.net>, "tsvwg@ietf.org" <tsvwg@ietf.org>, Markku Kojo <kojo=40cs.helsinki.fi@dmarc.ietf.org>, Markku Kojo <kojo@cs.helsinki.fi>, John Kaippallimalil <kjohn@futurewei.com>, Donald Eastlake <d3e3e3@gmail.com>
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References: <202106230120.15N1Kmf5073721@gndrsh.dnsmgr.net> <11605D97-0764-4E6F-9022-A0318E9D5BA1@gmail.com>
To: Jonathan Morton <chromatix99@gmail.com>
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Subject: Re: [tsvwg] ECN encapsulation draft - proposed resolution
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Hi,

I just want to note that (almost) all of the results Pete posted, used and documented the same fq_codel with single queue method.
Also in Linux both sch_codel (see https://elixir.bootlin.com/linux/latest/source/net/sched/sch_codel.c) 
and sch_fq_codel (see https://elixir.bootlin.com/linux/latest/source/net/sched/sch_fq_codel.c) share  some of the codel implementation via:

#include <net/codel_impl.h>
#include <net/codel_qdisc.h>

so "fq_codel flows 1" seems an acceptable method to get to a single queue codel AQM, and one that loows to tests against multi-quueu/fq_codel with minimal unrelated changes.

Regards
	Sebastiab


> On Jun 23, 2021, at 03:35, Jonathan Morton <chromatix99@gmail.com> wrote:
> 
>> On 23 Jun, 2021, at 4:20 am, Rodney W. Grimes <ietf@gndrsh.dnsmgr.net> wrote:
>> 
>> To reduce any confusion here and in the future this "configuration"
>> should be noted if it is not.  Something like codel (implemented
>> using fq_codel with flow queues set to 1), or some such.
> 
> It actually is, in the header of the relevant plots: "fq_codel flows 1".
> 
> - Jonathan Morton

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