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From: Luca Muscariello <luca.muscariello@gmail.com>
To: Jonathan Morton <chromatix99@gmail.com>
Cc: Benjamin Cronce <bcronce@gmail.com>, bloat <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] benefits of ack filtering
Date: Wed, 13 Dec 2017 13:39:57 +0100	[thread overview]
Message-ID: <CAHx=1M7VG29L42-8Bfsp85AG4YYay1toktF5ER9Hb_bc-Oapgw@mail.gmail.com> (raw)
In-Reply-To: <CAJq5cE2n6WpmO8=dDFC=HQ5pMym0MvSeVDfirOaLvPnnvAa9cg@mail.gmail.com>

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If I understand the patch well, the ack filter is actually fixing the
problem of ACK compression only.
Because it is enforced on packets in the queue only. It is stateless.

ACK compression would happen even w/o highly asymmetric access links by
just
having concurrent data streams with ack streams.

So, IMO, the patch is harmless per se in all  cases.
ACK compression is harmful though and the patch fixes it.

Background on ACK compression:

Lixia Zhang, Scott Shenker, and Daivd D. Clark.
Observations on the dynamics of a congestion control algorithm: the effects
of two-way traffic.
acm sigcomm 1991.




On Tue, Dec 12, 2017 at 11:03 PM, Jonathan Morton <chromatix99@gmail.com>
wrote:

> The one "correct" argument against ack-filtering I've seen is that it
> encourages (or rather validates) the use of extreme asymmetry ratios.
>
> However, these extreme ratios are already in widespread use without the
> aid of ack-filtering.  Even ADSL2 Annex A has, as its "ideal" sync rate, a
> 16:1 ratio, which Annex M modifies to under 10:1.  I fear we must conclude
> that technical considerations are not the driving factor here.
>
> A better place to sort out the asymmetry problem (as well as several other
> problems of current interest) would be in a free, competitive market.
> Sadly such a thing is rare in the telecoms sector.
>
> - Jonathan Morton
>
> _______________________________________________
> Bloat mailing list
> Bloat@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/bloat
>
>

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  parent reply	other threads:[~2017-12-13 12:39 UTC|newest]

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-28 21:48 Dave Taht
2017-11-29  6:09 ` Mikael Abrahamsson
2017-11-29  9:34   ` Sebastian Moeller
2017-11-29 12:49     ` Mikael Abrahamsson
2017-11-29 13:13       ` Luca Muscariello
2017-11-29 14:31         ` Mikael Abrahamsson
2017-11-29 14:36           ` Jonathan Morton
2017-11-29 15:24             ` Andrés Arcia-Moret
2017-11-29 15:53           ` Luca Muscariello
     [not found]             ` <CAJq5cE3qsmy8EFYZmQsLL_frm8Tty9Gkm92MQPZ649+kpM1oMw@mail.gmail.com>
2017-11-29 16:13               ` Jonathan Morton
2017-11-30  7:03             ` Michael Welzl
2017-11-30  7:24               ` Dave Taht
2017-11-30  7:45               ` Dave Taht
2017-11-30  7:48               ` Jonathan Morton
2017-11-30  8:00                 ` Luca Muscariello
2017-11-30 10:24                 ` Eric Dumazet
2017-11-30 13:04                   ` Mikael Abrahamsson
2017-11-30 15:51                     ` Eric Dumazet
2017-12-01  0:28                     ` David Lang
2017-12-01  7:09                       ` Jan Ceuleers
2017-12-01 12:53                         ` Toke Høiland-Jørgensen
2017-12-01 13:13                           ` [Bloat] [Make-wifi-fast] " Кирилл Луконин
2017-12-01 13:22                             ` Luca Muscariello
2017-12-11 17:42                             ` Simon Barber
2017-12-01 13:17                           ` [Bloat] " Luca Muscariello
2017-12-01 13:40                             ` Toke Høiland-Jørgensen
2017-12-01 17:42                               ` Dave Taht
2017-12-01 20:39                                 ` Juliusz Chroboczek
2017-12-03  5:20                                   ` [Bloat] [Make-wifi-fast] " Bob McMahon
2017-12-03 10:35                                     ` Juliusz Chroboczek
2017-12-03 11:40                                       ` Jan Ceuleers
2017-12-03 13:57                                         ` Juliusz Chroboczek
2017-12-03 14:07                                           ` Mikael Abrahamsson
2017-12-03 19:53                                             ` Juliusz Chroboczek
2017-12-03 14:09                                           ` Ryan Mounce
2017-12-03 19:54                                             ` Juliusz Chroboczek
2017-12-03 20:14                                               ` Sebastian Moeller
2017-12-03 22:27                                                 ` Dave Taht
2017-12-03 15:25                                           ` Robert Bradley
2017-12-04  3:44                                         ` Dave Taht
2017-12-04 14:38                                           ` David Collier-Brown
2017-12-04 15:44                                             ` Juliusz Chroboczek
2017-12-04 17:17                                               ` David Collier-Brown
2017-12-03 19:04                                       ` Bob McMahon
2017-12-01 21:17                                 ` Bob McMahon
2017-12-01  8:45                       ` [Bloat] " Sebastian Moeller
2017-12-01 10:45                         ` Luca Muscariello
2017-12-01 18:43                           ` Dave Taht
2017-12-01 18:57                             ` Luca Muscariello
2017-12-01 19:36                               ` Dave Taht
2017-11-30 14:51                   ` Neal Cardwell
2017-11-30 15:55                     ` Eric Dumazet
2017-11-30 15:57                       ` Neal Cardwell
2017-11-29 16:50       ` Sebastian Moeller
2017-12-12 19:27         ` Benjamin Cronce
2017-12-12 20:04           ` Dave Taht
2017-12-12 21:03           ` David Lang
2017-12-12 21:29             ` Jonathan Morton
2017-12-12 22:03           ` Jonathan Morton
2017-12-12 22:21             ` David Lang
     [not found]               ` <CAJq5cE3nfSQP0GCLjp=X0T-iHHgAs=YUCcr34e3ARgkrGZe-wg@mail.gmail.com>
2017-12-12 22:41                 ` Jonathan Morton
2017-12-13  9:46                   ` Mikael Abrahamsson
2017-12-13 10:03                     ` Jonathan Morton
2017-12-13 12:11                       ` Sebastian Moeller
2017-12-13 12:18                         ` Jonathan Morton
2017-12-13 12:36                     ` Sebastian Moeller
2017-12-13 12:39             ` Luca Muscariello [this message]
2017-11-29 18:21   ` Juliusz Chroboczek
2017-11-29 18:41     ` Dave Taht
2017-11-29 23:29       ` Steinar H. Gunderson
2017-11-29 23:59       ` Stephen Hemminger
2017-11-30  0:21         ` Eric Dumazet
2017-12-11 20:15   ` Benjamin Cronce
2017-11-29 18:28 ` Juliusz Chroboczek
2017-11-29 18:48   ` Dave Taht
2017-12-11 18:30   ` Jonathan Morton

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