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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">And thanks!, please let us and the RMCAT group know if you do “real” implementations based on the C++ code.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">/Ingemar
<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Dave Taht [mailto:dave.taht@gmail.com]
<br>
<b>Sent:</b> den 4 april 2015 15:23<br>
<b>To:</b> Bill Ver Steeg (versteb)<br>
<b>Cc:</b> Ingemar Johansson S; rmcat WG (rmcat@ietf.org); iccrg@irtf.org; bloat<br>
<b>Subject:</b> Re: [rmcat] Scream C++ source code available<o:p></o:p></span></p>
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<p class="MsoNormal">it is always awesome to see testable source code. A core area we have not been able to test with netperf-wrapper and other tools are the characteristics of videoconferencing traffic. This looks to be a start! thx!<o:p></o:p></p>
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<p class="MsoNormal">On Mon, Mar 2, 2015 at 5:46 AM, Bill Ver Steeg (versteb) <<a href="mailto:versteb@cisco.com" target="_blank">versteb@cisco.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="color:#1F497D">Ingemar-</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="color:#1F497D"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="color:#1F497D">I read the document on the repository, and it is not clear to me if the test code actually sends packets over a live network or not. It
seems to use a simulated wireless network, but I am not sure.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="color:#1F497D"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="color:#1F497D">I am currently running some tests on how ABR video (mostly MPEG DASH) interacts with the various AQM schemes (Codel, PIE, FQ_Codel, FQ_PIE)
and it would be pretty easy for me to add a few SCREAM tests to my testbed. I could make these test results available to this group, if that would be interesting………If there is a way to have the SCREAM C++ code send data over a live network using a simple script,
I could plug that in pretty easily. The MS Visual Studio dependencies do not thrill me, but I can get past that 8-).</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="color:#1F497D"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="color:#1F497D">In the preliminary ABR testing, we have seen that the ABR algorithms actually work better when run on networks that do modern AQM. As you
probably know, most ABR algorithms only use loss as a congestion signal and do not use delay at all. When a link experiences bloat/delay (using large-buffer-tail-drop), the loss signal is delayed. It can be significantly delayed. This does have some impact
on the ABR algorithms. The most obvious artifact is a new ABR session taking a longer amount of time to get enough data to display its first video chunk, but there also appear to be some impacts on the baseline rate adaptation algorithm. We are still quantifying
these impacts…….</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="color:#1F497D"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="color:#1F497D">It would be interesting to compare how the candidate WEBRTC algorithms handles <timely loss events via AQM> vs <packet delay and subsequent
loss events via legacy buffer management algorithms>. </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="color:#1F497D"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="color:#1F497D">Bvs</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="color:#1F497D"> </span><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D"><img border="0" width="165" height="110" id="_x0000_i1025" src="cid:image001.jpg@01D07397.26511B90" alt="http://www.cisco.com/web/europe/images/email/signature/logo05.jpg"></span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><b><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:#666666">Bill Ver Steeg</span></b><span style="font-size:8.5pt;font-family:"Arial","sans-serif";color:#666666"><br>
DISTINGUISHED ENGINEER <br>
<a href="mailto:versteb@cisco.com" target="_blank">versteb@cisco.com</a></span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB" style="color:#1F497D"> </span><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="color:#1F497D"> </span><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> rmcat
[mailto:<a href="mailto:rmcat-bounces@ietf.org" target="_blank">rmcat-bounces@ietf.org</a>]
<b>On Behalf Of </b>Ingemar Johansson S<br>
<b>Sent:</b> Monday, March 02, 2015 8:03 AM<br>
<b>To:</b> rmcat WG (<a href="mailto:rmcat@ietf.org" target="_blank">rmcat@ietf.org</a>);
<a href="mailto:iccrg@irtf.org" target="_blank">iccrg@irtf.org</a><br>
<b>Subject:</b> [rmcat] SCReAM C++ source code available</span><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Arial","sans-serif"">Hi</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Arial","sans-serif""> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Arial","sans-serif"">Please find C++ source code for the SCReAM congestion control candidate algorithm at</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial","sans-serif""><a href="https://github.com/EricssonResearch/scream" target="_blank">https://github.com/EricssonResearch/scream</a></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Arial","sans-serif"">This code can be useful for experiments with SCReAM. The experimental code includes a simple video and network model
for initial experiments, the code should however be fairly easy to integrate into e.g. ns3 for more in-depth studies.
</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Arial","sans-serif""> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Arial","sans-serif"">Please note also that work is ongoing to integrate SCReAM in OpenWebRTC, the long term intention is to make OpenWebRTC
pluggable for other congestion control algorithms as well. Go to <a href="http://www.openwebrtc.io/" target="_blank">
http://www.openwebrtc.io/</a> for more information about the OpenWebRTC project. </span>
<span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Arial","sans-serif""> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Arial","sans-serif"">Short executive summary :</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#333333;background:white">SCReAM (<strong><span style="font-family:"Arial","sans-serif"">S</span></strong>elf-<strong><span style="font-family:"Arial","sans-serif"">C</span></strong>locked <strong><span style="font-family:"Arial","sans-serif"">R</span></strong>at<strong><span style="font-family:"Arial","sans-serif"">e</span></strong> <strong><span style="font-family:"Arial","sans-serif"">A</span></strong>daptation
for <strong><span style="font-family:"Arial","sans-serif"">M</span></strong>ultimedia) is a congestion control algorithm devised mainly for Video. Congestion control for WebRTC media is currently being standardized in the IETF RMCAT WG, the scope of the working
group is to define requirements for congestion control and also to standardize a few candidate solutions. SCReAM is a congestion control candidate solution for WebRTC developed at Ericsson Research and optimized for good performance in wireless access.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Arial","sans-serif""> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Arial","sans-serif"">Regards</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Arial","sans-serif"">Ingemar</span><span lang="EN-US"><o:p></o:p></span></p>
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<span style="font-family:"Arial","sans-serif"">=================================</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span lang="EN-US" style="font-family:"Arial","sans-serif"">Ingemar Johansson M.Sc.
</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span lang="EN-US" style="font-family:"Arial","sans-serif"">Senior Researcher</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span lang="EN-US" style="font-family:"Arial","sans-serif""> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span lang="EN-US" style="font-family:"Arial","sans-serif"">Ericsson AB</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span lang="EN-US" style="font-family:"Arial","sans-serif"">Wireless Access Networks</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span lang="EN-US" style="font-family:"Arial","sans-serif"">Labratoriegränd 11</span><span lang="EN-US"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Arial","sans-serif"">971 28, Luleå, Sweden</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span lang="EN-US" style="font-family:"Arial","sans-serif"">Phone +46-1071 43042</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span lang="EN-US" style="font-family:"Arial","sans-serif"">SMS/MMS <a href="tel:%2B46-73%20078%203289" target="_blank">
+46-73 078 3289</a></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-family:"Arial","sans-serif""><a href="mailto:ingemar.s.johansson@ericsson.com" target="_blank"><span lang="EN-US">ingemar.s.johansson@ericsson.com</span></a></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-family:"Arial","sans-serif""><a href="http://www.ericsson.com" target="_blank"><span lang="EN-US">www.ericsson.com</span></a></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span lang="EN-US" style="font-family:"Arial","sans-serif""> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span lang="EN-US" style="font-family:"Arial","sans-serif";color:black">“</span><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#252525;background:white">The Earth is a very small stage in a
</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span lang="EN-US" style="font-family:"Arial","sans-serif";color:#252525;background:white"> </span><span style="font-family:"Arial","sans-serif";color:#252525;background:white">vast cosmic arena</span><span style="font-family:"Arial","sans-serif"">”</span><span lang="EN-US" style="font-family:"Arial","sans-serif";color:black"><br>
</span><span lang="EN-US" style="font-family:"Arial","sans-serif"">Carl Sagan “Pale Blue Dot”<br>
</span><span style="font-family:"Arial","sans-serif"">=================================</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal">Dave Täht<br>
Let's make wifi fast, less jittery and reliable again!<br>
<br>
<a href="https://plus.google.com/u/0/107942175615993706558/posts/TVX3o84jjmb" target="_blank">https://plus.google.com/u/0/107942175615993706558/posts/TVX3o84jjmb</a><o:p></o:p></p>
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