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<p class="MsoNormal"><span style="color:#1F497D">Hi All,</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">Just to clarify, the QPI connects between to the processor sockets as well as the IOH (shared I/O controller), this is used to replace the FSB (front side bus) in Xeon processors. I believe setting this to 'I/O'
gives traffic with the I/O controller priority, settings this to 'Compute' gives computational (processor) traffic priority.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">I’m not certain where the bottleneck would be with FreeSWITCH.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">Considering each processor has its own memory controller and most of the configuration and data will be cached in the memory I would presume we ought to be giving bandwidth priority to computational traffic between
the processors, although not sure precisely how much difference this will make in production.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">This is one of the few discussions I’ve found about QPI bandwidth priority:
<a href="http://www.tomshardware.co.uk/forum/269051-28-intel-speed-relevancy">http://www.tomshardware.co.uk/forum/269051-28-intel-speed-relevancy</a></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">If anyone has anything else they would like to add please feel free.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,</span></p>
<p class="MsoNormal"><span style="color:#1F497D">Shaun</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org]
<b>On Behalf Of </b>Shaun Stokes<br>
<b>Sent:</b> 14 October 2016 11:37<br>
<b>To:</b> FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org><br>
<b>Subject:</b> [Freeswitch-users] Preferred Intel QPI Bandwidth Priority Setting for FreeSWITCH</span></p>
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<p class="MsoNormal"> </p>
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<p class="MsoNormal">We’re looking at deploying FreeSWITCH 1.6 with SIP, Conferencing, Video and WebRTC connected to PostgreSQL for 1000-2000 endpoints using dialplans (stored in memcache) of upto roughly 100 lines.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">The hardware we’ve spec’d includes 32GB RAM, 2x Intel X5650 CPUs and 6x 73GB 15.2K SAS HDs in RAID 5 volume (for increased I/O and throughput) on PERC H700 controller.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">My question is, what would the preferred setting be for Intel QPI Bandwidth Priority, the options are either ‘Compute’ (default) or ‘I/O’ (optimized for I/O intensive workloads)?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">This is what we’ve found on the suppliers website:</p>
<p class="MsoNormal">The Intel QPI Bandwidth priority has two settings, compute and I/O. It is set to “compute” by default.</p>
<p class="MsoNormal">This option determines the number and priority of requests on the QPI bus. Recall that the QPI</p>
<p class="MsoNormal">connects the processor sockets as well as the IOH. The “compute” setting favors computational traffic</p>
<p class="MsoNormal">while the “I/O” setting is optimized for IO intensive workloads.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">The last thing we want is an I/O bottlenecks but after researching this on Intel’s website I believe the above ‘I/O’ setting is specifically aimed at prioritizing traffic between the memory controller (RAM) and CPU, while ‘Compute’ prioritizes
computational traffic. Does anyone know what the preference should be FreeSWITCH in this scenario?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks,</p>
<p class="MsoNormal">Shaun</p>
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