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Re: [tsvwg] [Ecn-sane] per-flow scheduling

"David P. Reed" <dpreed@deepplum.com> Tue, 25 June 2019 21:05 UTC

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Date: Tue, 25 Jun 2019 17:05:37 -0400
From: "David P. Reed" <dpreed@deepplum.com>
To: Jonathan Morton <chromatix99@gmail.com>
Cc: Brian E Carpenter <brian.e.carpenter@gmail.com>, "ecn-sane@lists.bufferbloat.net" <ecn-sane@lists.bufferbloat.net>, tsvwg IETF list <tsvwg@ietf.org>
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Subject: Re: [tsvwg] [Ecn-sane] per-flow scheduling
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So, go for it, then. I wish you well.
 
On Monday, June 24, 2019 4:14pm, "Jonathan Morton" <chromatix99@gmail.com> said:



> > On 24 Jun, 2019, at 10:50 pm, David P. Reed <dpreed@deepplum.com>
> wrote:
> >
> > My overall point here is that you seem to live in a world of academic-like
> purity - all TCP connections are essentially huge file transfers, where there are
> no delays on production or consumption of packets at the endpoint, there is no
> multiplexing or scheduling of processes in the endpoint operating systems, etc.
> 
> On the contrary, I've found that per-flow queuing algorithms like DRR++ cope
> naturally and very nicely with all sorts of deviations from the ideal, including
> for example the wild variations in goodput and RTT associated with wifi links.
> 
> These are exactly the kinds of complication that I imagine - and not merely in the
> abstract but through observation - that a pure end-to-end approach would have
> great difficulty in accommodating elegantly.
> 
> - Jonathan Morton
> 
>

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