unethical-acronym3118

Any help on this would be greatly appreciated. I tried the following variation: I tried to set cores 2,3 for emulatorpin and now if the core 0 is 100% utilised, the FPS tanks. CS:GO runs generally at 250+ FPS but when core 0 is 100%, FPS drops to ~40FPS. Any ideas, anyone??

Hi, I am trying to setup a gaming VM with below config: <?xml version='1.0' encoding='UTF-8'?> <domain type='kvm' id='3' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> <name>Windows 11</name> <uuid>79923a18-d917-e5cc-2278-3f329451d52c</uuid> <metadata> <vmtemplate xmlns="unraid" name="Windows 11" icon="windows11.png" os="windowstpm"/> </metadata> <memory unit='KiB'>26214400</memory> <currentMemory unit='KiB'>26214400</currentMemory> <memoryBacking> <nosharepages/> <source type='memfd'/> <access mode='shared'/> </memoryBacking> <vcpu placement='static'>12</vcpu> <iothreads>1</iothreads> <cputune> <vcpupin vcpu='0' cpuset='4'/> <vcpupin vcpu='1' cpuset='5'/> <vcpupin vcpu='2' cpuset='6'/> <vcpupin vcpu='3' cpuset='7'/> <vcpupin vcpu='4' cpuset='8'/> <vcpupin vcpu='5' cpuset='9'/> <vcpupin vcpu='6' cpuset='10'/> <vcpupin vcpu='7' cpuset='11'/> <vcpupin vcpu='8' cpuset='12'/> <vcpupin vcpu='9' cpuset='13'/> <vcpupin vcpu='10' cpuset='14'/> <vcpupin vcpu='11' cpuset='15'/> </cputune> <resource> <partition>/machine</partition> </resource> <os> <type arch='x86_64' machine='pc-i440fx-7.1'>hvm</type> <loader readonly='yes' type='pflash'>/usr/share/qemu/ovmf-x64/OVMF_CODE-pure-efi-tpm.fd</loader> <nvram>/etc/libvirt/qemu/nvram/79923a18-d917-e5cc-2278-3f329451d52c_VARS-pure-efi-tpm.fd</nvram> </os> <features> <acpi/> <apic/> <hyperv mode='custom'> <relaxed state='on'/> <vapic state='on'/> <spinlocks state='on' retries='8191'/> <vendor_id state='on' value='none'/> </hyperv> </features> <cpu mode='host-passthrough' check='none' migratable='on'> <topology sockets='1' dies='1' cores='6' threads='2'/> <cache mode='passthrough'/> </cpu> <clock offset='localtime'> <timer name='hypervclock' present='yes'/> <timer name='hpet' present='no'/> </clock> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/local/sbin/qemu</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2' cache='writeback'/> <source file='/mnt/user/domains/Windows 11/vdisk1.img' index='3'/> <backingStore/> <target dev='hdc' bus='virtio'/> <serial>vdisk1</serial> <boot order='1'/> <alias name='virtio-disk2'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source file='/mnt/user/isos/Windows 11 Premium (22621.1992) By Phrankie.iso' index='2'/> <backingStore/> <target dev='hda' bus='ide'/> <readonly/> <boot order='2'/> <alias name='ide0-0-0'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source file='/mnt/user/isos/virtio-win-0.1.229-1.iso' index='1'/> <backingStore/> <target dev='hdb' bus='ide'/> <readonly/> <alias name='ide0-0-1'/> <address type='drive' controller='0' bus='0' target='0' unit='1'/> </disk> <controller type='pci' index='0' model='pci-root'> <alias name='pci.0'/> </controller> <controller type='ide' index='0'> <alias name='ide'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <controller type='virtio-serial' index='0'> <alias name='virtio-serial0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </controller> <controller type='usb' index='0' model='ich9-ehci1'> <alias name='usb'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x7'/> </controller> <controller type='usb' index='0' model='ich9-uhci1'> <alias name='usb'/> <master startport='0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0' multifunction='on'/> </controller> <controller type='usb' index='0' model='ich9-uhci2'> <alias name='usb'/> <master startport='2'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x1'/> </controller> <controller type='usb' index='0' model='ich9-uhci3'> <alias name='usb'/> <master startport='4'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x2'/> </controller> <filesystem type='mount' accessmode='passthrough'> <driver type='virtiofs' queue='1024'/> <binary path='/usr/libexec/virtiofsd' xattr='on'> <cache mode='always'/> <sandbox mode='chroot'/> </binary> <source dir='/mnt/user/isos'/> <target dir='isos'/> <alias name='fs0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </filesystem> <interface type='bridge'> <mac address='52:54:00:15:14:c3'/> <source bridge='br0'/> <target dev='vnet2'/> <model type='virtio-net'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <source path='/dev/pts/0'/> <target type='isa-serial' port='0'> <model name='isa-serial'/> </target> <alias name='serial0'/> </serial> <console type='pty' tty='/dev/pts/0'> <source path='/dev/pts/0'/> <target type='serial' port='0'/> <alias name='serial0'/> </console> <channel type='unix'> <source mode='bind' path='/var/lib/libvirt/qemu/channel/target/domain-3-Windows 11/org.qemu.guest_agent.0'/> <target type='virtio' name='org.qemu.guest_agent.0' state='disconnected'/> <alias name='channel0'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> <input type='mouse' bus='ps2'> <alias name='input0'/> </input> <input type='keyboard' bus='ps2'> <alias name='input1'/> </input> <tpm model='tpm-tis'> <backend type='emulator' version='2.0' persistent_state='yes'/> <alias name='tpm0'/> </tpm> <audio id='1' type='none'/> <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x03' slot='0x00' function='0x0'/> </source> <alias name='hostdev0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </hostdev> <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x03' slot='0x00' function='0x1'/> </source> <alias name='hostdev1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/> </hostdev> <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x00' slot='0x1f' function='0x3'/> </source> <alias name='hostdev2'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/> </hostdev> <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x00' slot='0x14' function='0x3'/> </source> <alias name='hostdev3'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x0a' function='0x0'/> </hostdev> <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x00' slot='0x16' function='0x0'/> </source> <alias name='hostdev4'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x0b' function='0x0'/> </hostdev> <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x00' slot='0x1f' function='0x5'/> </source> <alias name='hostdev5'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x0c' function='0x0'/> </hostdev> <hostdev mode='subsystem' type='usb' managed='no'> <source startupPolicy='optional'> <vendor id='0x046d'/> <product id='0xc53f'/> <address bus='1' device='6'/> </source> <alias name='hostdev6'/> <address type='usb' bus='0' port='1'/> </hostdev> <hostdev mode='subsystem' type='usb' managed='no'> <source startupPolicy='optional'> <vendor id='0x1462'/> <product id='0x7d43'/> <address bus='1' device='3'/> </source> <alias name='hostdev7'/> <address type='usb' bus='0' port='2'/> </hostdev> <hostdev mode='subsystem' type='usb' managed='no'> <source startupPolicy='optional' missing='yes'> <vendor id='0x22d9'/> <product id='0x2765'/> </source> <alias name='hostdev8'/> <address type='usb' bus='0' port='3'/> </hostdev> <hostdev mode='subsystem' type='usb' managed='no'> <source startupPolicy='optional'> <vendor id='0x25a7'/> <product id='0xfa70'/> <address bus='1' device='2'/> </source> <alias name='hostdev9'/> <address type='usb' bus='0' port='4'/> </hostdev> <hostdev mode='subsystem' type='usb' managed='no'> <source startupPolicy='optional'> <vendor id='0x8087'/> <product id='0x0026'/> <address bus='1' device='14'/> </source> <alias name='hostdev10'/> <address type='usb' bus='0' port='5'/> </hostdev> <memballoon model='none'/> </devices> <seclabel type='dynamic' model='dac' relabel='yes'> <label>+0:+100</label> <imagelabel>+0:+100</imagelabel> </seclabel> <qemu:capabilities> <qemu:del capability='usb-host.hostdevice'/> </qemu:capabilities> </domain> I have an intel I7-12700 (non K), AMD Radeon RX-6800. I passthrough cores 4-15 to the VM. However, while playing heavy games (recently tried Starfield), the CPU cores not passed through to the VM (specifically core 2) get to a 100% which lower the in game FPS from 60 FPS to 40 FPS. Once the CPU utilisation for those cores goes down, the game comes back to 60 FPS. I am guessing this might be due to some overheads related to IO or something else. Another point to note, the game is stored on a share pool I have created specifically for installing games off of an DRAM-less SSD. Any help on the same would be much appreciated. Please do let me know if any further details are required from my end.