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<p class="MsoNormal"><span style="font-size:11.0pt">Some testing of this has convinced me that the FEEDBACK algorithm is not actually tracking CPU Load as is claimed by the documentation. I believe it is actually checking CPU Utilization as a percentage. But
since the values in the module are not exposed I cannot be sure.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The lack of response on this question leads me to believe the rate_limit module, or perhaps just the NETWORK and FEEDBACK algorithms, are not widely used so I may just avoid them.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Ben Newlin </span>
<span style="font-size:11.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From: </span></b><span style="color:black">Users <users-bounces@lists.opensips.org> on behalf of Ben Newlin <Ben.Newlin@genesys.com><br>
<b>Reply-To: </b>OpenSIPS users mailling list <users@lists.opensips.org><br>
<b>Date: </b>Friday, November 15, 2019 at 5:09 PM<br>
<b>To: </b>OpenSIPS users mailling list <users@lists.opensips.org><br>
<b>Subject: </b>Re: [OpenSIPS-Users] Rate Limit Module Implementation<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">As a follow up to this, when I tried to set the limit for the FEEDBACK algorithm to 0 for testing, I received this error:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">invalid limit for FEEDBACK algorithm (must be between 0 and 100)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Per the documentation this algorithm should be tracking CPU Load, but the range being 0 to 100 makes me wonder if it is actually reporting a percentage, similar to the load statistics exported by OpenSIPS
core [1].</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Can anyone using this module clarify what unit the limit for this algorithm is expected to be in? The ambiguity is one of the reasons I had wanted to track the values being obtained for a time before actually
engaging limited, which is what prompted my original question.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">[1] - </span><a href="https://www.opensips.org/Documentation/Interface-CoreStatistics-2-4#toc14">https://www.opensips.org/Documentation/Interface-CoreStatistics-2-4#toc14</a><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Ben Newlin </span>
<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="color:black">From: </span></b><span style="color:black">Users <users-bounces@lists.opensips.org> on behalf of Ben Newlin <Ben.Newlin@genesys.com><br>
<b>Reply-To: </b>OpenSIPS users mailling list <users@lists.opensips.org><br>
<b>Date: </b>Thursday, November 14, 2019 at 3:45 PM<br>
<b>To: </b>OpenSIPS users mailling list <users@lists.opensips.org><br>
<b>Subject: </b>[OpenSIPS-Users] Rate Limit Module Implementation</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Hello,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">We are looking to implement some rate limiting using the module, but I have a few questions and wanted to see if anyone has run into the same issues or has working experience with the module to answer them.
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The module provides $rl_count and also a counter value in the output of the rl_list command, but both of these values only reflect the number of rl_check calls that were made in the time window. In the case
of TAILDROP, RED, and SBT algorithms, the count is directly related to the limit and drop_rate. But for the NETWORK and FEEDBACK algorithms, the counter is essentially meaningless.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">What we are looking for is a way to track the values these modules are using to make drop decisions, so that we can set our limit value appropriately. But unless I am missing something, there is no way to
access these values for either NETWORK or FEEDBACK. Is that correct?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Ben Newlin </span>
<o:p></o:p></p>
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