[Qemu-discuss] [problem]-starting a VM causes RT (latency) problem for application running on another VM

[Yan Fridland]

Hello All,

Here is a problem I saw when I ran virsh start to a VM.

I have 2VMs on a server when one of them is running a RT application and the other is in shut down state. Then I executed "virsh start" to the second VM and saw 2-3 seconds later a big latency problem in my RT application running on the first VM.

I want to emphasize that the VMs use dedicated isolated cores of the server and I have the relevant configuration on the server and the vcpu pinning section of virsh xml.

Can anyone tell me why I experience such behavior and how it can be resolved?

I will highly appreciate your help.

Thank you,

Yan