High CPU Usage caused by migration thread on Node

21 Sep 2016

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Hi,

We've got a problem with a critical machine which running Oracle Database a=
nd if someone can help us it would be very nice.

Our VM is running rhel 6.5 and is configuring with 16 cores (2 virtual sock=
et with 8 virtual cores) and 240Gb.

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.

We wan't to move this virtual machine on a new server, Transtec with two  E=
5-2650 v3 - 10 cores on each cpu - and 256Gb of memory. We have encountered=
 high cpu usage on this host.

Both servers are running centOS 7.2 and ovirt 3.6. We have already identifi=
ed that on the node, many < migrate/N > are causing high cpu usage.

We have tried few options :

-       Pass-Through Host CPU

-       Configure NUMA : numa node count =3D 2, numa pinning
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.

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)

Thank you for your advices.

Styve

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<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">Hi,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",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.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">Our VM is running rhel 6.5 and is configu=
ring with 16 cores (2 virtual socket with 8 virtual cores) and 240Gb.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",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.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">We wan’t to move this virtual machi=
ne 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.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">Both servers are running centOS 7.2 and o=
virt 3.6. We have already identified that on the node, many « mi=
grate/N » are causing high cpu usage.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">We have tried few options :
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span style=3D"font-size:10.0pt;font-family:&=
quot;Arial",sans-serif;color:black"><span style=3D"mso-list:Ignore">-<=
span style=3D"font:7.0pt "Times New Roman"">   &nb=
sp;  
</span></span></span><![endif]><span style=3D"font-size:10.0pt;font-family:=
"Arial",sans-serif;color:black">Pass-Through Host CPU<o:p></o:p><=
/span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span style=3D"font-size:10.0pt;font-family:&=
quot;Arial",sans-serif;color:black"><span style=3D"mso-list:Ignore">-<=
span style=3D"font:7.0pt "Times New Roman"">   &nb=
sp;  
</span></span></span><![endif]><span style=3D"font-size:10.0pt;font-family:=
"Arial",sans-serif;color:black">Configure NUMA : numa node c=
ount =3D 2, numa pinning
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">The first day the machine was running, ev=
erything 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.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",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)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">Thank you for your advices.<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black">Styve<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif;color:black"><o:p> </o:p></span></p>
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jaumotte, styve

Doron Fediuck

jaumotte, styve

jaumotte, styve

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