From: Mikael Abrahamsson <swmike@swm.pp.se>
To: cerowrt-devel@lists.bufferbloat.net
Subject: Re: [Cerowrt-devel] Ubiquiti QOS
Date: Mon, 26 May 2014 02:18:30 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.02.1405260213590.29282@uplift.swm.pp.se> (raw)
In-Reply-To: <1401048053.664331760@apps.rackspace.com>
On Sun, 25 May 2014, dpreed@reed.com wrote:
> The optimum buffer state for throughput is 1-2 packets worth - in other
> words, if we have an MTU of 1500, 1500 - 3000 bytes. Only the bottleneck
No, the optimal state for througbut is to have huge buffers and have them
filled. The optimal state for interactivity is to have very small buffers.
FQ_CODEL tries to strike a balance between the two at 10ms of buffer. PIE
does the same around 20ms. In order for PIE to work properly I'd say you
need 50ms of buffering as a minimum, otherwise you're going to get 100%
tail drop and multiple sequential drops occasionally (which might be
desireable to keep interactivity good).
My comment about 50ms is that you seldom need a lot more.
--
Mikael Abrahamsson email: swmike@swm.pp.se
next prev parent reply other threads:[~2014-05-26 0:18 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-25 6:17 Dane Medic
2014-05-25 14:23 ` Valdis.Kletnieks
2014-05-25 15:42 ` Mikael Abrahamsson
2014-05-25 20:00 ` dpreed
2014-05-26 0:18 ` Mikael Abrahamsson [this message]
2014-05-26 4:49 ` dpreed
2014-05-26 13:02 ` Mikael Abrahamsson
2014-05-26 14:01 ` dpreed
2014-05-26 14:11 ` Mikael Abrahamsson
2014-05-26 15:31 ` David P. Reed
2014-05-27 21:19 ` David Lang
2014-05-27 22:00 ` Dave Taht
2014-05-27 23:27 ` David Lang
2014-05-28 2:12 ` Dave Taht
2014-05-28 3:21 ` David Lang
2014-05-28 15:52 ` dpreed
2014-05-28 16:34 ` David Lang
2014-05-27 15:23 ` Jim Gettys
2014-05-27 17:31 ` Dave Taht
2014-05-28 15:33 ` dpreed
2014-05-28 15:20 ` dpreed
2014-05-28 18:33 ` David Lang
2014-05-29 12:11 ` David P. Reed
2014-05-29 15:29 ` dpreed
2014-05-29 19:30 ` David Lang
2014-05-29 23:40 ` Michael Richardson
2014-05-30 0:32 ` David P. Reed
2014-05-30 0:36 ` Dave Taht
2014-05-25 18:39 ` Sebastian Moeller
2014-05-25 19:33 ` Dave Taht
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