[ovirt-users] CPU usage question

[David Johnson]

Hi everyone,

I am slowly working the performance bottlenecks out of my rack, and ran
into this puzzling scenario.

Ovirt shows CPU usage at over 50%.
Windows shows CPU usage between 5 and 15 %

The backing store is TrueNAS NFS on a 10 GBit lan. I am seeing just under 1
GBit throughput on the storage network for this operation (create database).

Am I reading this correctly that my system is bottlenecking on the CPU used
to handle the Windows disk IO over TCP/IP ?

Thanks

*David Johnson*

Screenshot of pertinent metrics:
[image: image.png]



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[Juhani Rautiainen]

Hi!

I've run into this in KVM so it's possible that your case is the same.
Check this article: https://codingpackets.com/blog/kvm-host-high-cpu-fix/

I think you can try that setting safely on that node where the VM runs. At
least I could play with it without seeing any ill effects. I had a really
high CPU load on my FW VM when I upgraded to VSDL. This fix dropped it down
immediately.

Thanks,
Juhani

Post by David Johnson
Hi everyone,
I am slowly working the performance bottlenecks out of my rack, and ran
into this puzzling scenario.
Ovirt shows CPU usage at over 50%.
Windows shows CPU usage between 5 and 15 %
The backing store is TrueNAS NFS on a 10 GBit lan. I am seeing just under
1 GBit throughput on the storage network for this operation (create
database).
Am I reading this correctly that my system is bottlenecking on the CPU
used to handle the Windows disk IO over TCP/IP ?
Thanks
*David Johnson*
[image: image.png]
<https://www.linkedin.com/in/pojoguy/>
<https://maxistechnology.com/wp-content/uploads/vcards/vcard-David_Johnson.vcf>
<https://maxistechnology.com/>
*Follow us:* <https://www.linkedin.com/company/maxis-tech-inc/>
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