From: Luca Muscariello <luca.muscariello@gmail.com>
To: Jonathan Morton <chromatix99@gmail.com>
Cc: Michael Welzl <michawe@ifi.uio.no>, David Ros <dros@simula.no>,
bloat <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] benefits of ack filtering
Date: Thu, 30 Nov 2017 09:00:26 +0100 [thread overview]
Message-ID: <CAHx=1M6uO5-yBGLBfgbs3qEywND31purrp_1zkFxbercDS2p7Q@mail.gmail.com> (raw)
In-Reply-To: <CAJq5cE36bErJGDQQutpFgbENmiN9SvSc+bVXJ-BmZ9S_Jv3joA@mail.gmail.com>
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Agree and think this is a lucid analysis of the problem(s) and solution(s).
But, what can be done to let clients upgrade orders of magnitude faster
than today?
Move transport in user space inside the app? Else?
On Thu, Nov 30, 2017 at 8:48 AM, Jonathan Morton <chromatix99@gmail.com>
wrote:
> I do see your arguments. Let it be known that I didn't initiate the
> ack-filter in Cake, though it does seem to work quite well.
>
> With respect to BBR, I don't think it depends strongly on the return rate
> of acks in themselves, but rather on the rate of sequence number advance
> that they indicate. For this purpose, having the receiver emit sparser but
> still regularly spaced acks would be better than having some middlebox
> delete some less-predictable subset of them. So I think BBR could be a
> good testbed for AckCC implementation, especially as it is inherently paced
> and thus doesn't suffer from burstiness as a conventional ack-clocked TCP
> might.
>
> The real trouble with AckCC is that it requires implementation on the
> client as well as the server. That's most likely why Google hasn't tried
> it yet; there are no receivers in the wild that would give them valid data
> on its effectiveness. Adding support in Linux would help here, but aside
> from Android devices, Linux is only a relatively small proportion of
> Google's client traffic - and Android devices are slow to pick up new
> kernel features if they can't immediately turn it into a consumer-friendly
> bullet point.
>
> Meanwhile we have highly asymmetric last-mile links (10:1 is typical, 50:1
> is occasionally seen), where a large fraction of upload bandwidth is
> occupied by acks in order to fully utilise the download bandwidth in TCP.
> Any concurrent upload flows have to compete with that dense ack flow, which
> in various schemes is unfair to either the upload or the download
> throughput.
>
> That is a problem as soon as you have multiple users on the same link, eg.
> a family household at the weekend. Thinning out those acks in response to
> uplink congestion is a solution. Maybe not the best possible solution, but
> a deployable one that works.
>
> - Jonathan Morton
>
> _______________________________________________
> Bloat mailing list
> Bloat@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/bloat
>
>
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next prev parent reply other threads:[~2017-11-30 8:00 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 [this message]
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
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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