From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Oliver Hohlfeld <oliver@net.t-labs.tu-berlin.de>
Cc: tsvwg@ietf.org, bloat <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] [tsvwg] how much of a problem is buffer bloat today?
Date: Thu, 21 Mar 2013 20:25:35 +0100 (CET) [thread overview]
Message-ID: <alpine.DEB.2.00.1303212019520.2309@uplift.swm.pp.se> (raw)
In-Reply-To: <514B5AC8.8000502@net.t-labs.tu-berlin.de>
On Thu, 21 Mar 2013, Oliver Hohlfeld wrote:
> In summary, the question on how much of a problem buffer bloat currently
> is cannot be fully answered and still requires further research.
Buffer bloat is a problem on basically all access forms apart from ETTH.
Usually ETTH is produced using L2 or L3 switches with very small buffers
(5 ms or so), and policing is used instead of buffering for limiting
service rate. This means high speed TCP flows will sawtooth their
performance over time because of large amount of consecutive drops,
meaning low bw interactive flows are less impacted.
So it's my belief that your measurements means most people don't actually
put congestion pressure on their accesses, thus the large buffers are
seldom used and you're not seeing buffering.
--
Mikael Abrahamsson email: swmike@swm.pp.se
next prev parent reply other threads:[~2013-03-21 19:25 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <51408BF4.7090304@cisco.com>
[not found] ` <8C48B86A895913448548E6D15DA7553B7D020F@xmb-rcd-x09.cisco.com>
2013-03-21 17:50 ` Oliver Hohlfeld
2013-03-21 18:01 ` Jim Gettys
2013-03-21 18:14 ` Oliver Hohlfeld
2013-03-21 18:28 ` Jim Gettys
2013-03-21 18:36 ` Dave Taht
2013-03-21 19:08 ` Oliver Hohlfeld
2013-03-21 19:25 ` Mikael Abrahamsson [this message]
2013-03-21 20:05 ` Jim Gettys
2013-03-22 4:27 ` Mikael Abrahamsson
2013-03-22 6:00 ` [Bloat] [aqm] " grenville armitage
2013-03-22 13:23 ` Mikael Abrahamsson
2013-03-22 13:31 ` Dave Taht
2013-03-26 17:25 ` Mirja Kuehlewind
2013-03-26 17:49 ` [Bloat] [tsvwg] [aqm] " Scheffenegger, Richard
2013-03-26 20:02 ` Hagen Paul Pfeifer
2013-03-21 20:04 ` [Bloat] [tsvwg] " David Lang
2013-03-21 20:47 ` Oliver Hohlfeld
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