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

On Thu, May 27, 2021 at 10:46 PM David Johnson <djohnson@maxistechnology.com> wrote:
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.png



 

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