<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Sep 21, 2016 at 12:28 PM, jaumotte, styve <span dir="ltr"><<a href="mailto:s.jaumotte@maine-et-loire.fr" target="_blank">s.jaumotte@maine-et-loire.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">Hi,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">We’ve got a problem with a critical machine which running Oracle Database and if someone can help us it would be very nice.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">Our VM is running rhel 6.5 and is configuring with 16 cores (2 virtual socket with 8 virtual cores) and 240Gb.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">This virtual machine is running perfectly on the first host R620 : two cpu E5-2695 v2 - 12 cores on each cpu - and 384Gb of memory.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">We wan’t to move this virtual machine on a new server, Transtec with two E5-2650 v3 – 10 cores on each cpu – and 256Gb of memory. We have encountered high cpu usage
on this host.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">Both servers are running centOS 7.2 and ovirt 3.6. We have already identified that on the node, many « migrate/N » are causing high cpu usage.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">We have tried few options :
<u></u><u></u></span></p>
<p><u></u><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><span>-<span style="font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:normal;font-stretch:normal;font-size:7pt;line-height:normal;font-family:"times new roman"">
</span></span></span><u></u><span style="font-size:10pt;font-family:arial,sans-serif;color:black">Pass-Through Host CPU<u></u><u></u></span></p>
<p><u></u><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><span>-<span style="font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:normal;font-stretch:normal;font-size:7pt;line-height:normal;font-family:"times new roman"">
</span></span></span><u></u><span style="font-size:10pt;font-family:arial,sans-serif;color:black">Configure NUMA : numa node count = 2, numa pinning
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">The first day the machine was running, everything is ok and migrate threads disapeared, but on the second day, high cpu and migration thread were back. Oracle services
are being restarted everyday for cold backup but not the virtual machines.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">I don’t know if looking in the Numa options is a good idea and I don’t why the everything is running ok on the R620 (perhaps the available memory)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">Thank you for your advices.<span class="gmail-HOEnZb"><font color="#888888"><u></u><u></u></font></span></span></p><span class="gmail-HOEnZb"><font color="#888888">
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black">Styve<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:arial,sans-serif;color:black"><u></u> <u></u></span></p>
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<br></blockquote></div><br></div><div class="gmail_extra">Hi Styve,</div><div class="gmail_extra">Pass-Through Host CPU is irrelevant unless you have a specific CPU flag you need to utilize.<br></div><div class="gmail_extra">So I suggest you refrain from using it.</div><div class="gmail_extra">As for NUMA, it works well as long as it's not interleaving. Here as well you should use it only</div><div class="gmail_extra">if you understand how it should be used. Otherwise the safe option for you is vCPU pinning.</div><div class="gmail_extra">Can you please check your logs to see who is creating these threads and share it?</div><div class="gmail_extra"><br></div></div>