vali20's latest activity
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Vvali20 reacted to nodoame's post in the thread High VM-EXIT and Host CPU usage on idle with Windows Server 2025 with
Like.
I can confirm EnablePerCpuClockTickScheduling=2 fixes / works around the issue. CPU load returns to 23H2 levels and CPU cores assigned to the VM are able to enter deeper C states as expected. Thank you! I've attached this info to the QEMU ticket... -
Vvali20 replied to the thread High VM-EXIT and Host CPU usage on idle with Windows Server 2025.Machine left for 2 hours idling, virtio-nic connected, WiFi turned off from action center in Windows, screen off, average residency: Pkg%pc2 Pkg%pc3 Pkg%pc6 Pk%pc10 PkgWatt 4.77 0.00 71.89 0.00 2.63 4.77 0.00 71.89 0.00 2.63...
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Vvali20 reacted to SchorschSK's post in the thread High VM-EXIT and Host CPU usage on idle with Windows Server 2025 with Like.
Absolutely great work !!! After applying the registry hack and rebooting our Idle times are now the same as on pre 24H2. CPU idle less then 1%.
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Vvali20 replied to the thread High VM-EXIT and Host CPU usage on idle with Windows Server 2025.No, it's off. 24H2 indeed introduced per core clock ticks, and apparently that is what kills residency in VMs. I don't really understand why, but that is one difference in the KiSetTime/KiGetTime functions in 24H2 compared to Server 2022, for...
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Vvali20 replied to the thread High VM-EXIT and Host CPU usage on idle with Windows Server 2025.Something's wrong with this OS. You can bump that number in the Python script, I tested with 500ms. The pkg pc6 residency then reaches 60-70% when idle, as was the case with previous versions. Effects can be easily seen, for example, the cursor...
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Vvali20 replied to the thread High VM-EXIT and Host CPU usage on idle with Windows Server 2025.For completeness, here is also my full virsh XML for this VM: <domain type='kvm' id='2' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> <name>console</name> <uuid>837730e7-258a-4357-865b-375fe422825f</uuid> <memory...
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Vvali20 replied to the thread High VM-EXIT and Host CPU usage on idle with Windows Server 2025.Hi guys, I spent a quite some time trying everything mentioned here and in other threads related to this. For me, the benchmark was being able to lower PkgWatt and reach Pkg%pc2 and Pkg%pc6 residency in my VM. This VM I run on my laptop...