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From: Jonathan Morton <chromatix99@gmail.com>
To: Simon Barber <simon@superduper.net>
Cc: Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr>,
	bloat <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] AQM and PPP on Linux
Date: Tue, 28 Jul 2015 17:43:25 +0300	[thread overview]
Message-ID: <628EB9BF-C35C-4CC1-A8D5-EE66486232E0@gmail.com> (raw)
In-Reply-To: <14ed5136170.27f7.e972a4f4d859b00521b2b659602cb2f9@superduper.net>


> On 28 Jul, 2015, at 17:31, Simon Barber <simon@superduper.net> wrote:
> 
> The issue is that Codel tries to keep the delay low, and will start dropping when sojourn time grows above 5ms for 100ms. For longer RTT links more delay is necessary to avoid underutilizing the link.

I’m pretty sure we’ve had this discussion before, several times.

Codel works pretty well, with an interval of 100ms, when the actual RTT is between about 10ms and 1000ms.  That accounts for 99.9% of the practical paths you’ll see on the Internet.

If you really are concerned about long-RTT paths, then you can increase the interval parameter to suit.  This will hurt Codel’s performance slightly on very short-RTT paths.

 - Jonathan Morton


  reply	other threads:[~2015-07-28 14:43 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-28 13:09 Juliusz Chroboczek
2015-07-28 13:33 ` Toke Høiland-Jørgensen
2015-07-28 13:50   ` Juliusz Chroboczek
2015-07-28 14:05     ` Toke Høiland-Jørgensen
2015-07-28 14:11       ` Simon Barber
2015-07-28 14:21         ` Eric Dumazet
2015-07-28 14:31           ` Simon Barber
2015-07-28 14:43             ` Jonathan Morton [this message]
2015-07-28 14:49             ` Eric Dumazet
2015-07-28 14:55               ` Eric Dumazet
2015-07-28 16:02               ` Alan Jenkins
2015-07-28 16:22             ` Sebastian Moeller
2015-07-28 17:11               ` Michael Welzl
2015-07-29  7:19         ` David Lang
2015-07-28 19:20       ` Juliusz Chroboczek
2015-07-28 19:29         ` Alan Jenkins
2015-07-28 14:18     ` Eric Dumazet
2015-07-28 14:44 ` Dave Taht
2015-07-28 14:52   ` Eric Dumazet
2015-07-28 19:24   ` Juliusz Chroboczek
2015-07-28 19:31     ` Bill Ver Steeg (versteb)
2015-07-28 20:10     ` Alan Jenkins
2015-07-28 20:45       ` Alan Jenkins
2015-07-29 13:15   ` Stefan Alfredsson
2015-07-29 13:41     ` Dave Taht

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