From: Neal Cardwell <ncardwell@google.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jonathan Morton <chromatix99@gmail.com>,
Michael Welzl <michawe@ifi.uio.no>, David Ros <dros@simula.no>,
bloat <bloat@lists.bufferbloat.net>,
Yuchung Cheng <ycheng@google.com>, Wei Wang <weiwan@google.com>
Subject: Re: [Bloat] benefits of ack filtering
Date: Thu, 30 Nov 2017 10:57:07 -0500 [thread overview]
Message-ID: <CADVnQymON1wQ=-i2W1ooqZ41Hyez03i1tUYb_qE-bdTFcMPpiQ@mail.gmail.com> (raw)
In-Reply-To: <1512057319.19682.16.camel@gmail.com>
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On Thu, Nov 30, 2017 at 10:55 AM, Eric Dumazet <eric.dumazet@gmail.com>
wrote:
> On Thu, 2017-11-30 at 09:51 -0500, Neal Cardwell wrote:
> > On Thu, Nov 30, 2017 at 5:24 AM, Eric Dumazet <eric.dumazet@gmail.com
> > > wrote:
> > > I agree that TCP itself should generate ACK smarter, on receivers
> > > that
> > > are lacking GRO. (TCP sends at most one ACK per GRO packets, that
> > > is
> > > why we did not feel an urgent need for better ACK generation)
> > >
> > > It is actually difficult task, because it might need an additional
> > > timer, and we were reluctant adding extra complexity for that.
> >
> > How about just using the existing delayed ACK timer, and just making
> > the delayed ACK logic a bit smarter? We could try using the existing
> > logic and timers, but using something adaptive instead of the magic
> > "2" MSS received to force an ACK.
>
> Keep in mind some distros have HZ=250 or even HZ=100
>
> So even a 'one jiffie' timer could add 10ms delay.
>
Right, good point. I forgot about those cases. :-)
neal
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next prev parent reply other threads:[~2017-11-30 15:57 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 [this message]
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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