Re: [tcpPrague] [tcpm] Fwd: I-D Action: draft-bagnulo-tcpm-tcp-low-rtt-00.txt

Hi Marcello,

I very much appreciate your draft.

Even more so as it addresses one of the things I find to be a bit
"disturbing"  in the l4s drafts - Namely the claim that the finer saw
tooth functionality of l4s/DCTCP alone solves the latency problems (while
DCTCP indeed also is tuning the RTO timeout aggressively).
E.g., the formulation in  section 1.1 of
https://datatracker.ietf.org/doc/draft-briscoe-tsvwg-ecn-l4s-id/?include_t
ext=1

It turns out that a TCP algorithm like DCTCP that solves TCP's
   scalability problem also solves the latency problem, because the
   finer sawteeth cause very little queuing delay.  A supporting paper
   [DCttH15] gives the full explanation of why the design solves both
   the latency and the scaling problems, both in plain English and in
   more precise mathematical form.  The explanation is summarised
   without the maths in [I-D.briscoe-aqm-dualq-coupled].

could benefit from a reference to your draft or the issue that you
addresses here (at least for comprehensiveness).

An additional comment is  that new approaches to retransmissions - like
TCP TLP and TCP RACK (also SCTP TLR which however is not progressing at
the moment) might fundamentally alter the picture. I.e., if
retransmissions are sent pro-actively in tail loss situations then more
conservative RTOs may be kept for situations where it is prudent to wait
longer. Don't know if TCP TLP is so widely deployed that it is something
that you should relate to even if it may be superseded by RACK. Just a
thought.

BR, Karen

> -----Original Message-----
> From: tcpm [mailto:tcpm-bounces@ietf.org] On Behalf Of marcelo bagnulo
> braun
> Sent: 8. juli 2016 23:19
> To: tcpm IETF list <tcpm@ietf.org>
> Subject: [tcpm] Fwd: I-D Action: draft-bagnulo-tcpm-tcp-low-rtt-00.txt
>
> Hi,
>
> We just submitted this draft for consideration of the WG. Comments are
> appreciated.
>
> Regards, marcelo
>
>
>
>
> -------- Mensaje reenviado --------
> Asunto: 	I-D Action: draft-bagnulo-tcpm-tcp-low-rtt-00.txt
> Fecha: 	Fri, 08 Jul 2016 14:16:35 -0700
> De: 	internet-drafts@ietf.org
> Responder a: 	internet-drafts@ietf.org
> Para: 	i-d-announce@ietf.org
>
>
>
> A New Internet-Draft is available from the on-line Internet-Drafts
directories.
>
>
>          Title           : Recommendations for increasing TCP
performance in low RTT
> networks.
>          Authors         : Marcelo Bagnulo
>                            Koen De Schepper
>                            Glenn Judd
> 	Filename        : draft-bagnulo-tcpm-tcp-low-rtt-00.txt
> 	Pages           : 7
> 	Date            : 2016-07-08
>
> Abstract:
>     This documents compiles a set of issues that negatively affect TCP
>     performance in low RTT networks as well as the recommendations to
>     overcome them.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-bagnulo-tcpm-tcp-low-rtt/
>
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-bagnulo-tcpm-tcp-low-rtt-00
>
>
> Please note that it may take a couple of minutes from the time of
submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
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