High CPU Usage caused by migration thread on Node

Wednesday, 21 September 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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 Hi,<o:p></o:p></p...
 <o:p>&nbsp;</o:p></p...
 We&#8217;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></p...
 <o:p>&nbsp;</o:p></p...
 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></p...
 <o:p>&nbsp;</o:p></p...
 This virtual machine is running perfectly=
 on the first host R620&nbsp;: two cpu E5-2695 v2 - 12 cores on each cpu - =
&nbsp;and 384Gb of memory.<o:p></o:p></p...
 <o:p>&nbsp;</o:p></p...
 We wan&#8217;t to move this virtual
machi=
ne on a new server, Transtec with two &nbsp;E5-2650 v3 &#8211; 10 cores on =
each cpu &#8211; and 256Gb of memory. We have encountered high cpu usage
 on this host.<o:p></o:p></p...
 <o:p>&nbsp;</o:p></p...
 Both servers are running centOS 7.2 and o=
virt 3.6. We have already identified that on the node, many &laquo;&nbsp;mi=
grate/N&nbsp;&raquo; are causing high cpu
usage.<o:p></o:p></p...
 <o:p>&nbsp;</o:p></p...
 We have tried few options&nbsp;:
<o:p></o:p></p...
 <![if !supportLists]>-<=
span style=3D"font:7.0pt &quot;Times New
Roman&quot;">&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;
<![endif]>Pass-Through Host
CPU<o:p></o:p><=
/span></p...
 <![if !supportLists]>-<=
span style=3D"font:7.0pt &quot;Times New
Roman&quot;">&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;
<![endif]>Configure NUMA&nbsp;: numa
node c=
ount =3D 2, numa pinning
<o:p></o:p></p...
 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></p...
 <o:p>&nbsp;</o:p></p...
 I don&#8217;t know if looking in the
Numa=
 options is a good idea and I don&#8217;t why the everything is running ok =
on the R620 (perhaps the available memory)<o:p></o:p></p...
 <o:p>&nbsp;</o:p></p...
 Thank you for your
advices.<o:p></o:p></s=
pan></p...
 <o:p>&nbsp;</o:p></p...
 Styve<o:p></o:p></p...
 <o:p>&nbsp;</o:p></p...
 <o:p>&nbsp;</o:p></p...

</div...

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