This page shows the
measurements of reordering between few selected european NRENs, as
described in the table.
In order to have the best possible outcome of the test, we have used
RUDE/CRUDE packet generator, with carefully selected traffic patterns
reflecting few real applications potentially sensitive to reordering.
Also for the reference we have included some artificial traffic
patterns, to show the maximum reordering extent. The packet traces have been obtained by capturing the real application
traffic, using tcpdump.
The following packet traces were included in the tests:
- base-test.trace
This trace was prepared to see the maximum reordering extent, where a
burst of small packets follows a burst of large packets. This is a
hypothetical scenario, not likely to happen in the real environment. If
someone experienced such traffic in the application please let us know
or send us the packet trace with application
description.
- long-packets.trace
Similarly to above - we were sending bursts of long packets of the same
size. Both long and short packets tests were performed in order to
check if there is reordering for identical packets.
- jmstudio_mpeg_video.trace
This trace was taken from MPEG video stream generated with
JMStudio. JMStudio is a stand alone Java application that uses the
JMF 2.0 API to play, capture, transcode, and write media data. JMStudio
also uses the JMF RTP APIs to receive and transmit media streams across
the network.
- vlc.trace
VLC -
(initially VideoLAN Client) is a highly portable multimedia player for
various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3,
ogg, ...) as well as DVDs, VCDs, and various streaming protocols. It
can also be used as a server to stream in unicast or multicast in IPv4
or IPv6 on a high-bandwidth network.
- mcast_ogg.trace
This sample was taken from our own streaming application - MCast6 -
developed within 6net project. The application was sending the stream
in OGG format.
- icecast_ogg.trace
This is the trace of a radio stream sent in OGG format by the IceCast
application.
We have performed the measurements for 2 different reordering metrics: draft-ietf-ippm-reordering-05.txt (IPPM) and draft-jayasumana-reorder-density-02.txt (RD) each of them measuring reordering differently.
Please see our page showing how to read the results: IPPM metrics and Reorder Density metric .
We would like to thank all those who made their
machines available for thesting.
Please note that we were not able to verify all the results yet, there
may be some problems resulting from multitute machines and operating
systems we used in the tests. For sure we know we had some problems
with node in Ireland, but we hope to solve them soon (large packet
losses to node in Ireland (?))
Please send us all feedback you may have.
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