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Hi Junxiao,
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<div class="">A registration for a new UDP face causes the RTT to increase slightly, ~2ms above the previous experiment:</div>
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<div class="">Content From /ndn - Ping Reference = 477477776 <span class="Apple-tab-span" style="white-space:pre">
</span>- Round Trip Time = 0.778 ms<br class="">
Content From /ndn - Ping Reference = 477477777 <span class="Apple-tab-span" style="white-space:pre">
</span>- Round Trip Time = 0.649 ms<br class="">
Content From /ndn - Ping Reference = 477477778 <span class="Apple-tab-span" style="white-space:pre">
</span>- Round Trip Time = 16.614 ms<br class="">
Content From /ndn - Ping Reference = 477477779 <span class="Apple-tab-span" style="white-space:pre">
</span>- Round Trip Time = 0.982 ms</div>
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<div class="">A registration for a non-existent face ID causes a large increase in the RTT:</div>
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<div class="">Content From /ndn - Ping Reference = 479746716 <span class="Apple-tab-span" style="white-space:pre">
</span>- Round Trip Time = 0.77 ms<br class="">
Content From /ndn - Ping Reference = 479746717 <span class="Apple-tab-span" style="white-space:pre">
</span>- Round Trip Time = 0.695 ms<br class="">
Content From /ndn - Ping Reference = 479746718 <span class="Apple-tab-span" style="white-space:pre">
</span>- Round Trip Time = 52.996 ms<br class="">
Content From /ndn - Ping Reference = 479746719 <span class="Apple-tab-span" style="white-space:pre">
</span>- Round Trip Time = 0.808 ms<br class="">
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Since we simply want to update the expiration time for a particular namespace in the RIB, would there be any use for a protocol extension that allows for the expiration time for a namespace to be updated with one RIB command?<br class="Apple-interchange-newline">
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Vince Lehman</div>
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<div class="">On Apr 24, 2015, at 1:38 PM, Junxiao Shi <<a href="mailto:shijunxiao@email.arizona.edu" class="">shijunxiao@email.arizona.edu</a>> wrote:</div>
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<div dir="ltr" class="">Hi Lan
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<div class="">Before I can suggest any code patches, additional experiment is needed to confirm or reject the hypothesis in <a href="http://www.lists.cs.ucla.edu/pipermail/nfd-dev/2015-April/001049.html" class="">http://www.lists.cs.ucla.edu/pipermail/nfd-dev/2015-April/001049.html</a>
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<div class="">If you want to measure RTT changes due to route changes, one possible way is to increase the link delay.<br class="">
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<div class="">When the link delay is 10ms, a 10ms RTT change is 50% and appears significant.</div>
<div class="">When the link delay is 500ms, a 10ms RTT change is 1% and appears negligible.</div>
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<div class="">Yours, Junxiao<br class="">
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<div class="gmail_quote">On Fri, Apr 24, 2015 at 11:33 AM, Lan Wang (lanwang) <span dir="ltr" class="">
<<a href="mailto:lanwang@memphis.edu" target="_blank" class="">lanwang@memphis.edu</a>></span> wrote:<br class="">
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<div style="word-wrap:break-word" class="">Basically, we saw a large jump in ndnping results between two nodes even though there was no path change for the path between those two nodes. We found that it was because those nodes (or the intermediate ones) were
busy updating their FIB (for other routes) -- each registration and unregistration of a route obviously took ~10ms for NRD/NFD to process.
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<div class="">We were interested in RTT changes due to route changes, so the extra delay caused by the route registrations is an undesirable side effect we'd like to remove (thus Vince's email). So any suggestions on how to deal with this in our experiments
are highly appreciated.</div>
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<div class="">In the long term, we do need to address the problem of high processing delays of route registrations.</div>
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Lan</div>
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