[190333] in North American Network Operators' Group
measuring effects of happy eyeballs
daemon@ATHENA.MIT.EDU (Bajpai, Vaibhav)
Sat Jun 25 12:56:00 2016
X-Original-To: nanog@nanog.org
From: "Bajpai, Vaibhav" <v.bajpai@jacobs-university.de>
To: "nanog@nanog.org" <nanog@nanog.org>
Date: Sat, 25 Jun 2016 16:55:52 +0000
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Dear NANOG,
A paper on measuring the effects of happy eyeballs [RFC 6555] just got
accepted last week. This uses a 3-years long ('13 - '16) dataset of TCP
connect times towards ALEXA top 10K websites collected from 80 =
dual-stacked
SamKnows probes. We just released [a] the paper. Thought to share it =
along:
[a] http://goo.gl/JmKEax
Feedback most welcome!
You may recall preliminary versions of this work at RIPE 66 [b] and IETF =
87 [c].
[b] https://ripe66.ripe.net/archives/video/1208
[c] https://vimeo.com/71407427
Measuring the Effects of Happy Eyeballs
---------------------------------------
The IETF has developed protocols that promote a healthy IPv4 and IPv6
co-existence. The Happy Eyeballs (HE) algorithm, for instance, prevents =
bad
user experience in situations where IPv6 connectivity is broken. Using =
an
active test (happy) that measures TCP connection establishment times, we
evaluate the effects of the HE algorithm. The happy test measures =
against
ALEXA top 10K websites from 80 SamKnows probes connected to dual-stacked
networks representing 58 different ASes. Using a 3-years long (2013 - =
2016)
dataset, we show that TCP connect times to popular websites over IPv6 =
have
considerably improved over time. As of May 2016, 18% of these websites =
are
faster over IPv6 with 91% of the rest at most 1 ms slower. The =
historical
trend shows that only around 1% of the TCP connect times over IPv6 were =
ever
above the HE timer value (300 ms), which leaves around 2% chance for =
IPv4 to
win a HE race towards these websites. As such, 99% of these websites =
prefer
IPv6 connections more than 98% of the time. We show that although =
absolute TCP
connect times (in ms) are not that far apart in both address families, =
HE with
a 300 ms timer value tends to prefer slower IPv6 connections in around =
90% of
the cases. We show that lowering the HE timer value to 150 ms gives us a
margin benefit of 10% while retaining same preference levels over IPv6.
Best, Vaibhav
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Vaibhav Bajpai
www.vaibhavbajpai.com
Room 91, Research I
School of Engineering and Sciences
Jacobs University Bremen, Germany
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