Hi,
I can observe the same behaviour. Since Win11 24h2 (23h2 works fine), every vcpu added to a Windows 24h2 or newer VM will cause constant 3.5-4.5% cpu core load on the host when vm is mostly idle. I have tested this with several systems running Xeon Skylake and Cascade Lake dual socket servers and its the same everywhere. I have tested most CPU flags and CPU types.
Here is how it looks like with just one Win11 24h2 VM (12 vcpus) running and doing nothing:
On this particular machine 2 x Xeon 6230R , just having the VM idle, raises the power consumption (measured at wall), by 70 Watts. 70 Watts for an idle Windows...
it started with upgrade to Win11 24h2. Win11 25H2 is showing the same symptoms.
I can observe the same behaviour. Since Win11 24h2 (23h2 works fine), every vcpu added to a Windows 24h2 or newer VM will cause constant 3.5-4.5% cpu core load on the host when vm is mostly idle. I have tested this with several systems running Xeon Skylake and Cascade Lake dual socket servers and its the same everywhere. I have tested most CPU flags and CPU types.
Here is how it looks like with just one Win11 24h2 VM (12 vcpus) running and doing nothing:
On this particular machine 2 x Xeon 6230R , just having the VM idle, raises the power consumption (measured at wall), by 70 Watts. 70 Watts for an idle Windows...
it started with upgrade to Win11 24h2. Win11 25H2 is showing the same symptoms.
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