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From: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
To: "Sebastian Moeller" <moeller0@gmx.de>, "Dave Täht" <dave.taht@gmail.com>
Cc: cake@lists.bufferbloat.net
Subject: Re: [Cake] Stranger target behaviour
Date: Sun, 1 Nov 2015 13:21:34 +0000	[thread overview]
Message-ID: <563611DE.5080304@darbyshire-bryant.me.uk> (raw)
In-Reply-To: <7F32378C-878D-437C-B56C-F8E5B0D99895@gmx.de>

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On 01/11/15 09:47, Sebastian Moeller wrote:
> Hi there,
>
> On Oct 31, 2015, at 21:29 , Dave Taht <dave.taht@gmail.com> wrote:
>
>> The second one is from the interval >> 4, which equates to 6.2ms. I
>> note I picked that because some early data (2012) we had showed that
>> target slightly greater than cable media acquision (6ms) time was a
>> slight win, and it did not hurt to use a number more evenly divisible
>> in binary than the arbitrary 5%.
> 	Well, but should it not be 6.2ms even if no rtt is explicitly requested? Currently cake has a lot of corner-cases that are not too well documented either.
Sebastian as ever picks up on the exact source of my confusion/point.

If 'target=interval/16' is the new mantra then the defaults built in to
cake qdisc should be changed, otherwise we have the current situation
which is:  Default Interval=100ms, target=5ms.  If I specify rtt 100ms
via the joys of tc, then I have: Interval=100ms, target=6.2ms.  If I
specify a target keyword such as 'internet' which also has an interval=
100ms, then target become 5ms again.  Somewhat inconsistent.






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  reply	other threads:[~2015-11-01 13:21 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-31 19:35 Kevin Darbyshire-Bryant
2015-10-31 20:29 ` Dave Taht
2015-11-01  9:47   ` Sebastian Moeller
2015-11-01 13:21     ` Kevin Darbyshire-Bryant [this message]
2015-11-01 16:05       ` Sebastian Moeller
2015-11-01 17:18         ` Kevin Darbyshire-Bryant
2015-11-01 17:48           ` Sebastian Moeller

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