Overal I don’t really have issues with gaming performance, but it is strange that there is such a big gap between Host and Guest in Cinebench R15. I can run on Cinebench R20 and see if the gap is till that big.
Cinebench R15 single thread score: 145, Host: 170
Update 1:
Tested on Cinebench R20: Single thread score: 342, Host: 421 so about ~18% difference. I’ll be reverting to older VM configurations and see if there is any difference.
Specs:
- Guest: Windows 10 1903
- Host: Fedora 30 @ kernel 5.3.7 with QEMU-KVM 4.1.0-4
- 2700x overclocked to 4.1 ghz all core
- 3000 mhz 15-15-15-35 overclocked memory
- Gigabyte Aorus AX-370 Gaming K7 @ bios version: F31 (No PBO option, which is another topic for another time)
- RX 5700 XT 50th Anniversary Edition
Grub settings:
amd_iommu=on,fullflush amd_iommu_intr=vapic kvm-amd.avic=1 rd.driver.pre=vfio-pci amdgpu.vm_fragment_size=9 transparent_hugepage=never isolcpus=2-7,10-15 nohz_full=2-7,10-15 rcu_nocbs=2-7,10-15 default_hugepagesz=1G hugepagesz=1G skew_tick=1"
Libvirt XML:
<domain type='kvm'>
<name>win10-3</name>
<uuid>6a4b4c8c-b03f-42a8-9185-64ed78b7a161</uuid>
<metadata>
<libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0">
<libosinfo:os id="http://microsoft.com/win/10"/>
</libosinfo:libosinfo>
</metadata>
<memory unit='KiB'>33554432</memory>
<currentMemory unit='KiB'>33554432</currentMemory>
<memoryBacking>
<hugepages>
<page size='1048576' unit='KiB'/>
</hugepages>
<nosharepages/>
<discard/>
</memoryBacking>
<vcpu placement='static' current='12'>16</vcpu>
<iothreads>1</iothreads>
<cputune>
<vcpupin vcpu='0' cpuset='7'/>
<vcpupin vcpu='1' cpuset='15'/>
<vcpupin vcpu='2' cpuset='6'/>
<vcpupin vcpu='3' cpuset='14'/>
<vcpupin vcpu='4' cpuset='5'/>
<vcpupin vcpu='5' cpuset='13'/>
<vcpupin vcpu='6' cpuset='4'/>
<vcpupin vcpu='7' cpuset='12'/>
<vcpupin vcpu='8' cpuset='3'/>
<vcpupin vcpu='9' cpuset='11'/>
<vcpupin vcpu='10' cpuset='2'/>
<vcpupin vcpu='11' cpuset='10'/>
<emulatorpin cpuset='4-7,12-15'/>
<iothreadpin iothread='1' cpuset='0,8'/>
</cputune>
<os>
<type arch='x86_64' machine='pc-q35-4.1'>hvm</type>
<loader readonly='yes' type='pflash'>/usr/share/edk2/ovmf/OVMF_CODE.fd</loader>
<nvram>/var/lib/libvirt/qemu/nvram/win10-3_VARS.fd</nvram>
<bootmenu enable='no'/>
</os>
<features>
<acpi/>
<apic/>
<hyperv>
<relaxed state='on'/>
<vapic state='on'/>
<spinlocks state='on' retries='8191'/>
<vpindex state='on'/>
<runtime state='on'/>
<synic state='on'/>
<stimer state='on'>
<direct state='on'/>
</stimer>
<reset state='off'/>
<vendor_id state='on' value='Fuck'/>
<frequencies state='on'/>
<reenlightenment state='on'/>
<tlbflush state='on'/>
<ipi state='off'/>
<evmcs state='off'/>
</hyperv>
<kvm>
<hidden state='on'/>
</kvm>
<vmport state='off'/>
<ioapic driver='kvm'/>
</features>
<cpu mode='custom' match='exact' check='partial'>
<model fallback='allow'>EPYC-IBPB</model>
<topology sockets='2' cores='4' threads='2'/>
<cache level='3' mode='emulate'/>
<feature policy='require' name='tsc-deadline'/>
<feature policy='require' name='hypervisor'/>
<feature policy='require' name='tsc_adjust'/>
<feature policy='require' name='arch-capabilities'/>
<feature policy='require' name='cmp_legacy'/>
<feature policy='require' name='perfctr_core'/>
<feature policy='require' name='virt-ssbd'/>
<feature policy='require' name='skip-l1dfl-vmentry'/>
<feature policy='disable' name='monitor'/>
<feature policy='disable' name='x2apic'/>
<feature policy='require' name='topoext'/>
<feature policy='require' name='invtsc'/>
</cpu>
<clock offset='localtime'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
<timer name='kvmclock' present='no'/>
<timer name='hypervclock' present='yes'/>
<timer name='tsc' present='yes' mode='native'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<controller type='usb' index='0' model='qemu-xhci' ports='15'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
</controller>
<controller type='pci' index='0' model='pcie-root'/>
<controller type='pci' index='1' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='1' port='0x10'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0' multifunction='on'/>
</controller>
<controller type='pci' index='2' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='2' port='0x11'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x1'/>
</controller>
<controller type='pci' index='3' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='3' port='0x12'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x2'/>
</controller>
<controller type='pci' index='4' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='4' port='0x13'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x3'/>
</controller>
<controller type='pci' index='5' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='5' port='0x14'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x4'/>
</controller>
<controller type='pci' index='6' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='6' port='0x15'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x5'/>
</controller>
<controller type='pci' index='7' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='7' port='0x16'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x6'/>
</controller>
<controller type='pci' index='8' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='8' port='0x8'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0' multifunction='on'/>
</controller>
<controller type='pci' index='9' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='9' port='0x9'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<controller type='sata' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
</controller>
<interface type='direct'>
<mac address='52:54:00:2a:f2:ae'/>
<source dev='enp5s0' mode='passthrough'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
</interface>
<interface type='network'>
<mac address='52:54:00:bd:3c:6a'/>
<source network='isolated'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>
</interface>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
</source>
<boot order='1'/>
<address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0x0b' slot='0x00' function='0x0'/>
</source>
<address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0x0b' slot='0x00' function='0x1'/>
</source>
<address type='pci' domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0x0d' slot='0x00' function='0x3'/>
</source>
<address type='pci' domain='0x0000' bus='0x06' slot='0x00' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0x0c' slot='0x00' function='0x3'/>
</source>
<address type='pci' domain='0x0000' bus='0x08' slot='0x00' function='0x0'/>
</hostdev>
<memballoon model='none'/>
</devices>
</domain>