The reference setup is describe in details with instruction on how to reproduce it in this article. 1.1 - Prerequisites Mandatory - Working Windows 10 or Windows 11 Guest - CPU supporting VT-D or AMD-Vi - Kernel: 5.8 + - QEMU 6+ - Libvirt 7+ - KVM Optional - Working GPU Passthrough - Kernel 5.15+ (Best performances) - Kernel 5+ Compiled with voluntary Preemption 1.2 - Reference Setup That said, if you want to get closer to bare metal speeds, you will need to perform several interventions on your guest and host alike. Without tuning your VM, you may experience stuttering, high CPU usage and slow interrupts and I/O but it may still be usable. Notes 6.1 Conclusion 6.2 Sources Last Update: 2022–09–26 1 -Preamble & Prerequisites Other Improvements 5.1 Improving the boot time of your machine 5.2 Enabling hugepages 6. I/O Optimization 4.1 Virtio drivers 4.2 Disable caching for RAW disks 4.3 Enabling TRIM 5. This guide is a collection of the all interventions I could find on wikis, forums and blogs that had a measurable impact on guest performance benchmarks. This guide is intended for existing KVM/QEMU Libvirt setups and will help you reach near native performance on your Windows 10 or 11 Guest. Improving the performance of a Windows Guest on KVM/QEMU
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