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<font face="monospace">Hi Pete,<br>
<br>
Try the script_trace() function, to see if the delay comes from
the script level. If not, it means it comes from the TCP layer
(maybe related to the dispatching of TCP cons between workers)<br>
<a class="moz-txt-link-freetext" href="https://www.opensips.org/Documentation/Script-CoreFunctions-3-5#script_trace">https://www.opensips.org/Documentation/Script-CoreFunctions-3-5#script_trace</a><br>
<br>
BTW, what are the TCP settings for:<br>
<a class="moz-txt-link-freetext" href="https://www.opensips.org/Documentation/Script-CoreParameters-3-5#tcp_parallel_read_on_workers">https://www.opensips.org/Documentation/Script-CoreParameters-3-5#tcp_parallel_read_on_workers</a><br>
<a class="moz-txt-link-freetext" href="https://opensips.org/html/docs/modules/3.5.x/proto_tcp.html#idp5528016">https://opensips.org/html/docs/modules/3.5.x/proto_tcp.html#idp5528016</a><br>
<br>
Regards,<br>
</font>
<pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext" href="https://www.opensips-solutions.com">https://www.opensips-solutions.com</a>
<a class="moz-txt-link-freetext" href="https://www.siphub.com">https://www.siphub.com</a></pre>
<div class="moz-cite-prefix">On 10.04.2025 23:42, Pete Kelly wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAEWH9M_Fz6jNN0HstsGSt1F_eTr4owGsmjA99x_OKc7LsoT4iw@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Hello all
<div><br>
</div>
<div dir="ltr">I am running some OpenSIPS proxies which are
talking to each other exclusively in TCP, however when
performing some (mild) load tests I am seeing some strange
behaviour from time to time, which manifests itself as what
looks like OpenSIPS taking a long time to process SIP
requests.</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">The most obvious issue I am seeing (and confirmed
by tcpdump) is when OpenSIPS receives an invite but may take
anything from 2-8 second to even send the 100 Trying!</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">e.g.</div>
<div dir="ltr">
<p class="p1">T 2025/04/10 20:28:10.257283 <a
href="http://10.3.0.4:48665" moz-do-not-send="true">10.3.0.4:48665</a>
-> <a href="http://10.3.0.12:5080"
moz-do-not-send="true">10.3.0.12:5080</a> [A] #4826</p>
<p class="p1">INVITE sip:... SIP/2.0.</p>
<p class="p2">T 2025/04/10 20:28:12.644355 <a
href="http://10.3.0.12:5080" moz-do-not-send="true">10.3.0.12:5080</a>
-> <a href="http://10.3.0.4:48665"
moz-do-not-send="true">10.3.0.4:48665</a> [AP] #4955<br>
<span class="s1"></span></p>
<p class="p1">SIP/2.0 100 Giving it a try.</p>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Is there an obvious route for me to debug this
behaviour to try and see where the bottleneck may lie ? Can I
see somewhere if all of the tcp workers are in use for example
and it is waiting for a worker?</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Pete</div>
<div dir="ltr"><br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr"><br>
</div>
</div>
<br>
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</blockquote>
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