Hello.
I have a homeserver with Threadripper 2920X, 64GB of RAM and RX580. Also I have Arch Linux installed. Currently I am running 4 VMs at the same time, one of which is Windows 10 VM with PCI passthrough (others don’t use PCi passthrough). The devices that are passed to VM are onboard USB controller, RX580 and sound card.
The problem is that this Windows 10 VM becomes laggy the longer it is being used. Rebooting the VM helps, however it will eventually start lagging again. The time it takes for VM to start lagging depends on workload, but several hours of gaming, for example, is enough to make the system interface unusable. I tried reinstalling Windows, however it didn’t change anything.
All the VMs are pinned to different threads, no shared threads. Also, windows 10 VM is entirely pinned to one numa node. All the VMs use 18 threads in total (6 threads are free for host OS). How can I solve this problem?
Thanks in advance.
Here is the current VM config:
<domain type='kvm'>
<name>PC</name>
<uuid>e3c99ddd-f2f5-423d-9e4e-d647434af8c6</uuid>
<metadata xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0" xmlns:cockpit_machines="https://github.com/cockpit-project/cockpit->
<libosinfo:libosinfo>
<libosinfo:os id="http://microsoft.com/win/2k22"/>
</libosinfo:libosinfo>
<cockpit_machines:data>
<cockpit_machines:has_install_phase>false</cockpit_machines:has_install_phase>
<cockpit_machines:install_source_type>disk_image</cockpit_machines:install_source_type>
<cockpit_machines:install_source>/dev/Main/PC</cockpit_machines:install_source>
<cockpit_machines:os_variant>win2k22</cockpit_machines:os_variant>
</cockpit_machines:data>
</metadata>
<memory unit='KiB'>16777216</memory>
<currentMemory unit='KiB'>16777216</currentMemory>
<vcpu placement='static'>8</vcpu>
<iothreads>2</iothreads>
<cputune>
<vcpupin vcpu='0' cpuset='6'/>
<vcpupin vcpu='1' cpuset='7'/>
<vcpupin vcpu='2' cpuset='8'/>
<vcpupin vcpu='3' cpuset='9'/>
<vcpupin vcpu='4' cpuset='18'/>
<vcpupin vcpu='5' cpuset='19'/>
<vcpupin vcpu='6' cpuset='20'/>
<vcpupin vcpu='7' cpuset='21'/>
</cputune>
<os>
<type arch='x86_64' machine='pc-q35-6.2'>hvm</type>
<loader readonly='yes' type='pflash'>/usr/share/edk2-ovmf/x64/OVMF_CODE.fd</loader>
<nvram>/var/lib/libvirt/qemu/nvram/PC_VARS.fd</nvram>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<hyperv mode='custom'>
<relaxed state='on'/>
<spinlocks state='on' retries='8191'/>
<vpindex state='on'/>
<reset state='on'/>
<vendor_id state='on' value='randomid'/>
</hyperv>
<kvm>
<hidden state='on'/>
</kvm>
<vmport state='off'/>
<ioapic driver='kvm'/>
</features>
<cpu mode='host-passthrough' check='none' migratable='off'>
<topology sockets='1' dies='1' cores='4' threads='2'/>
<feature policy='require' name='invtsc'/>
<feature policy='require' name='topoext'/>
<feature policy='disable' name='x2apic'/>
<feature policy='disable' name='amd-stibp'/>
</cpu>
<clock offset='utc'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='discard'/>
<timer name='hpet' 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>
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none' io='native' discard='unmap'/>
<source dev='/dev/Main/PC'/>
<target dev='vda' bus='virtio'/>
<iotune>
<read_bytes_sec>1048576000</read_bytes_sec>
<write_bytes_sec>1048576000</write_bytes_sec>
</iotune>
<address type='pci' domain='0x0000' bus='0x0b' slot='0x00' function='0x0'/>
</disk>
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none' io='native' discard='unmap'/>
<source dev='/dev/disk/by-id/nvme-Samsung_SSD_970_EVO_Plus_1TB_S4EWNX0RA03059B'/>
<target dev='vdb' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x0c' slot='0x00' function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<source file='/mnt/isostore/Win10_21H2_English_x64.iso'/>
<target dev='sda' bus='sata'/>
<readonly/>
<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/isostore/virtio-win-0.1.217.iso'/>
<target dev='sdb' bus='sata'/>
<readonly/>
<address type='drive' controller='0' bus='0' target='0' unit='1'/>
</disk>
<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-to-pci-bridge'>
<model name='pcie-pci-bridge'/>
<address type='pci' domain='0x0000' bus='0x06' slot='0x00' function='0x0'/>
</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='pci' index='10' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='10' port='0xa'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='pci' index='11' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='11' port='0xb'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x3'/>
</controller>
<controller type='pci' index='12' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='12' port='0xc'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x4'/>
</controller>
<controller type='scsi' index='0' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>
</controller>
<controller type='scsi' index='1' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x0a' slot='0x00' function='0x0'/>
</controller>
<controller type='sata' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:df:e7:e8'/>
<source bridge='Internet'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
</interface>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<audio id='1' type='none'/>
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0x42' slot='0x00' function='0x0'/>
</source>
<rom bar='on'/>
<address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0x42' slot='0x00' function='0x1'/>
</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='0x0a' slot='0x00' function='0x0'/>
</source>
<address type='pci' domain='0x0000' bus='0x08' slot='0x00' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0x43' slot='0x00' function='0x3'/>
</source>
<address type='pci' domain='0x0000' bus='0x09' slot='0x00' function='0x0'/>
</hostdev>
<memballoon model='none'/>
</devices>
</domain>