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From: Jonathan Morton <chromatix99@gmail.com>
To: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Cc: bloat <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] I feel an urge to update this
Date: Sat, 20 Sep 2014 18:55:59 +0300	[thread overview]
Message-ID: <0878F265-DDEA-416F-A54C-7B860A9C3A31@gmail.com> (raw)
In-Reply-To: <20140920090316.GA25876@sesse.net>


On 20 Sep, 2014, at 12:03 pm, Steinar H. Gunderson wrote:

> On Sat, Sep 20, 2014 at 02:33:06AM +0300, Dave Taht wrote:
>> http://tools.ietf.org/html/draft-gettys-iw10-considered-harmful-00
> 
> The pedant in me wants to point out that 4 -> 10 is not “2.5 times worse”,
> but “2.5 times as bad” or “1.5 times worse” (just as 4 -> 5 is “20% worse”,
> “0.2 times worse” or “1.2 times as bad”).

ISTR seeing some concrete test data showing that IW10 doesn't even work as designed, unless TCP pacing of some type is used to spread out the burst.  That's *despite* bloated buffers.  Really puts the nail in the coffin, if you ask me.

The recent work on SQM could be added to the list of mitigation measures.  Also, by keeping inter-flow latency low, it greatly reduces the original motivation for IW10 in the first place.

 - Jonathan Morton

  reply	other threads:[~2014-09-20 15:56 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-19 23:33 Dave Taht
2014-09-20  9:03 ` Steinar H. Gunderson
2014-09-20 15:55   ` Jonathan Morton [this message]
2014-09-20 16:47     ` Michael Welzl
2014-09-23  5:48 ` Mikael Abrahamsson
2014-09-23  8:31   ` Jonathan Morton
2014-09-25  4:16   ` David Lang
2014-09-25  5:32     ` Mikael Abrahamsson
2014-09-25  7:35       ` David Lang
2014-09-25  8:08         ` Mikael Abrahamsson
2014-09-25 11:00           ` David Lang
2014-09-25 13:00             ` Mikael Abrahamsson
2014-09-25 13:25               ` Dave Taht
2014-09-25 14:35                 ` Mikael Abrahamsson
2014-09-25 16:09       ` Rick Jones
2014-09-25 17:26         ` Mikael Abrahamsson
2014-09-25 17:49           ` Rick Jones
2014-09-27  8:59             ` Manolis Sifalakis
2014-09-29 17:28               ` Rick Jones
2014-10-04 19:56                 ` Manolis Sifalakis

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