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: image.png]

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