Nvidia GT 1030, passthrough, low performance

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1

I Have followed arch linux wiki guide to passthrough my gpu, then enabled hugepages and cpu pinning, also installed vfio disk drivers.
Finnaly when I started to benchmark I noticed that CPU and Memory performance is close to native.
But gpu is about 20~30% worse than native. I was searching for a solution about a day already. I can’t even find something to try.
Any idea??

    <domain xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0" type="kvm">
  <name>win10</name>
  <uuid>d51f2017-12fb-4744-bbbd-2d36ceba3157</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">8388608</memory>
  <currentMemory unit="KiB">8388608</currentMemory>
  <memoryBacking>
    <hugepages/>
  </memoryBacking>
  <vcpu placement="static">6</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="10"/>
    <vcpupin vcpu="5" cpuset="11"/>
    <emulatorpin cpuset="0-1"/>
    <iothreadpin iothread="1" cpuset="0-1"/>
    <iothreadpin iothread="2" cpuset="2-3"/>
  </cputune>
  <os>
    <type arch="x86_64" machine="pc-q35-5.0">hvm</type>
    <loader readonly="yes" type="pflash">/usr/share/edk2-ovmf/x64/OVMF_CODE.fd</loader>
    <nvram>/var/lib/libvirt/qemu/nvram/win10_VARS.fd</nvram>
  </os>
  <features>
    <acpi/>
    <apic/>
    <hyperv>
      <relaxed state="on"/>
      <vapic state="on"/>
      <spinlocks state="on" retries="8191"/>
      <vendor_id state="on" value="kvm hyperv"/>
    </hyperv>
    <kvm>
      <hidden state="on"/>
    </kvm>
    <vmport state="off"/>
    <ioapic driver="kvm"/>
  </features>
  <cpu mode="host-passthrough" check="none" migratable="on">
    <topology sockets="1" dies="1" cores="3" threads="2"/>
    <cache mode="passthrough"/>
    <feature policy="require" name="topoext"/>
  </cpu>
  <clock offset="localtime">
    <timer name="rtc" tickpolicy="catchup"/>
    <timer name="pit" tickpolicy="delay"/>
    <timer name="hpet" present="no"/>
    <timer name="hypervclock" present="yes"/>
  </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="file" device="disk">
      <driver name="qemu" type="qcow2"/>
      <source file="/home/Virt/Data.qcow2"/>
      <target dev="vda" bus="virtio"/>
      <address type="pci" domain="0x0000" bus="0x06" slot="0x00" function="0x0"/>
    </disk>
    <disk type="file" device="disk">
      <driver name="qemu" type="qcow2"/>
      <source file="/home/Virt/win10.qcow2"/>
      <target dev="vdb" bus="virtio"/>
      <boot order="1"/>
      <address type="pci" domain="0x0000" bus="0x09" slot="0x00" function="0x0"/>
    </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="sata" index="0">
      <address type="pci" domain="0x0000" bus="0x00" slot="0x1f" function="0x2"/>
    </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="0x8"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x0" multifunction="on"/>
    </controller>
    <controller type="pci" index="2" model="pcie-root-port">
      <model name="pcie-root-port"/>
      <target chassis="2" port="0x9"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x1"/>
    </controller>
    <controller type="pci" index="3" model="pcie-root-port">
      <model name="pcie-root-port"/>
      <target chassis="3" port="0xa"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x2"/>
    </controller>
    <controller type="pci" index="4" model="pcie-root-port">
      <model name="pcie-root-port"/>
      <target chassis="4" port="0xb"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x3"/>
    </controller>
    <controller type="pci" index="5" model="pcie-root-port">
      <model name="pcie-root-port"/>
      <target chassis="5" port="0xc"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x4"/>
    </controller>
    <controller type="pci" index="6" model="pcie-root-port">
      <model name="pcie-root-port"/>
      <target chassis="6" port="0xd"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x5"/>
    </controller>
    <controller type="pci" index="7" model="pcie-to-pci-bridge">
      <model name="pcie-pci-bridge"/>
      <address type="pci" domain="0x0000" bus="0x05" slot="0x00" function="0x0"/>
    </controller>
    <controller type="pci" index="8" model="pcie-root-port">
      <model name="pcie-root-port"/>
      <target chassis="8" port="0xe"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x6"/>
    </controller>
    <controller type="pci" index="9" model="pcie-root-port">
      <model name="pcie-root-port"/>
      <target chassis="9" port="0xf"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x7"/>
    </controller>
    <controller type="virtio-serial" index="0">
      <address type="pci" domain="0x0000" bus="0x08" slot="0x00" function="0x0"/>
    </controller>
    <interface type="network">
      <mac address="52:54:00:21:11:e0"/>
      <source network="default"/>
      <model type="virtio"/>
      <link state="up"/>
      <address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0"/>
    </interface>
    <channel type="spiceport">
      <source channel="org.spice-space.webdav.0"/>
      <target type="virtio" name="org.spice-space.webdav.0"/>
      <address type="virtio-serial" controller="0" bus="0" port="1"/>
    </channel>
    <input type="mouse" bus="virtio">
      <address type="pci" domain="0x0000" bus="0x00" slot="0x0e" function="0x0"/>
    </input>
    <input type="keyboard" bus="virtio">
      <address type="pci" domain="0x0000" bus="0x00" slot="0x0f" function="0x0"/>
    </input>
    <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>
      <address type="pci" domain="0x0000" bus="0x03" slot="0x00" function="0x0"/>
    </hostdev>
    <redirdev bus="usb" type="spicevmc">
      <address type="usb" bus="0" port="1"/>
    </redirdev>
    <memballoon model="virtio">
      <address type="pci" domain="0x0000" bus="0x04" slot="0x00" function="0x0"/>
    </memballoon>
    <shmem name="scream-ivshmem">
      <model type="ivshmem-plain"/>
      <size unit="M">2</size>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x11" function="0x0"/>
    </shmem>
  </devices>
  <qemu:commandline>
    <qemu:arg value="-object"/>
    <qemu:arg value="input-linux,id=mouse1,evdev=/dev/input/by-id/usb-PixArt_Dell_MS116_USB_Optical_Mouse-event-mouse"/>
    <qemu:arg value="-object"/>
    <qemu:arg value="input-linux,id=kbd1,evdev=/dev/input/by-id/usb-413c_Dell_KB216_Wired_Keyboard-event-kbd,grab_all=on,repeat=on"/>
  </qemu:commandline>
</domain>

CPU: 6-Core Intel Core i7-8086K (-MT MCP-) speed/min/max: 800/800/5000 MHz
Kernel: 5.4.60-2-MANJARO x86_64
Mem: 15759.4 MiB
NVIDIA GP108 [GeForce GT 1030] driver: vfio-pci v: 0.2

2

How did you measure GPU performance?

3

I tried the same gpu on a native windows 10, games that gave 30-60 fps, could hardly give 20 on passthrough set up.
also i found userbenchmark helpful

4

And you’re sure that the PCI passthrough is the bottleneck, not the CPU, RAM, etc?

5

I believe so, cause when the fps is low, only the gpu is working at maximum load (as shown in task manager).
Also the userbenchmark shows that the gpu scores way lower than the average, while cpu and memory are okay.

6

Have you checked if the Linux host is overloaded?

7

Yes, It’s not

8

Remove or disable:
migratable="on"

Definitely turn off memballoon:
<memballoon model='none'/>

Also check that your CPU pinning matches the actual CPU layout. The latter you get like this:

sudo virsh capabilities

Look for:

    <cpus num='24'>
      <cpu id='0' socket_id='0' die_id='0' core_id='0' siblings='0,12'/>
      <cpu id='1' socket_id='0' die_id='0' core_id='1' siblings='1,13'/>
      <cpu id='2' socket_id='0' die_id='0' core_id='2' siblings='2,14'/>
      <cpu id='3' socket_id='0' die_id='0' core_id='4' siblings='3,15'/>
    </cpus>

Yours will be different of course. In the example above you would configure as follows:

  <cputune>
    <vcpupin vcpu="0" cpuset="0"/>
    <vcpupin vcpu="1" cpuset="12"/>

except that you shouldn’t assign the first core. In the case above it would then be:

  <cputune>
    <vcpupin vcpu="0" cpuset="1"/>
    <vcpupin vcpu="1" cpuset="13"/>

Again, this is my 12 core CPU - yours is different.

Now to the main issue: I don’t see the graphics card in your configuration. Usually it would look like this:

    <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>

In the case above, the GPU is at PCI bus 0b:00.0 and 0b:00.1 - the second entry is for the audio device on the GPU (unless it doesn’t have audio, which is strange).

Is your card at 01:00.0 ? You can check this way:

lspci | grep -i vga

Then take the PCI bus number without the function part, and enter this:

lspci | grep -i 0b:00

to get all associated devices. (Mine is on bus 0b:00.)

Are you running looking glass? I see the following and though I never tried looking glass, this looks like it:

    <shmem name="scream-ivshmem">
      <model type="ivshmem-plain"/>
      <size unit="M">2</size>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x11" function="0x0"/>
    </shmem>

In the clock section, you may want to add:
<timer name='tsc' present='yes' mode='native'/>

Unless you are connected to the router via Wifi, a bridged network is better. You need to define bridge first, then you can configure as follows:

        <interface type='bridge'>
          <mac address='52:54:00:e1:40:10'/>
          <source bridge='bridge0'/>
          <model type='virtio'/>
          <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
        </interface>

You also have spice devices that may reduce performance. I usually get rid of all that stuff. Here is my config (for a Ryzen 3900X) for reference. Note that for Intel you better do host-passthrough:

<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
  <name>win10</name>
  <uuid>my-uuid</uuid>
  <title>Windows 10 Pro</title>
  <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'>50331648</memory>
  <currentMemory unit='KiB'>50331648</currentMemory>
  <memoryBacking>
    <hugepages/>
  </memoryBacking>
  <vcpu placement='static'>24</vcpu>
  <cputune>
    <vcpupin vcpu='0' cpuset='0'/>
    <vcpupin vcpu='1' cpuset='12'/>
    <vcpupin vcpu='2' cpuset='1'/>
    <vcpupin vcpu='3' cpuset='13'/>
    <vcpupin vcpu='4' cpuset='2'/>
    <vcpupin vcpu='5' cpuset='14'/>
    <vcpupin vcpu='6' cpuset='3'/>
    <vcpupin vcpu='7' cpuset='15'/>
    <vcpupin vcpu='8' cpuset='4'/>
    <vcpupin vcpu='9' cpuset='16'/>
    <vcpupin vcpu='10' cpuset='5'/>
    <vcpupin vcpu='11' cpuset='17'/>
    <vcpupin vcpu='12' cpuset='6'/>
    <vcpupin vcpu='13' cpuset='18'/>
    <vcpupin vcpu='14' cpuset='7'/>
    <vcpupin vcpu='15' cpuset='19'/>
    <vcpupin vcpu='16' cpuset='8'/>
    <vcpupin vcpu='17' cpuset='20'/>
    <vcpupin vcpu='18' cpuset='9'/>
    <vcpupin vcpu='19' cpuset='21'/>
    <vcpupin vcpu='20' cpuset='10'/>
    <vcpupin vcpu='21' cpuset='22'/>
    <vcpupin vcpu='22' cpuset='11'/>
    <vcpupin vcpu='23' cpuset='23'/>
  </cputune>
  <os>
    <type arch='x86_64' machine='pc-q35-5.0'>hvm</type>
    <loader readonly='yes' type='pflash'>/usr/share/OVMF/x64/OVMF_CODE.fd</loader>
    <nvram>/var/lib/libvirt/qemu/nvram/win10_VARS.fd</nvram>
    <boot dev='hd'/>
    <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='on'/>
      <vendor_id state='on' value='AuthenticAMD'/>
      <frequencies state='on'/>
      <reenlightenment state='on'/>
      <tlbflush state='on'/>
      <ipi state='on'/>
      <evmcs state='off'/>
    </hyperv>
    <kvm>
      <hidden state='on'/>
    </kvm>
    <vmport state='off'/>
  </features>
  <cpu mode='custom' match='exact' check='none'>
    <model fallback='allow'>EPYC-IBPB</model>
    <topology sockets='1' dies='1' cores='12' threads='2'/>
    <feature policy='require' name='svm'/>
    <feature policy='require' name='apic'/>
    <feature policy='require' name='invtsc'/>
    <feature policy='require' name='hypervisor'/>
    <feature policy='require' name='topoext'/>
    <feature policy='require' name='amd-no-ssb'/>
  </cpu>
  <clock offset='localtime'>
    <timer name='rtc' tickpolicy='catchup'/>
    <timer name='pit' tickpolicy='delay'/>
    <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' detect_zeroes='on'/>
      <source dev='/dev/vmvg/win10'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
    </disk>
    <disk type='block' device='disk'>
      <driver name='qemu' type='raw' cache='none' io='native' discard='ignore'/>
      <source dev='/dev/photos/photo_stripe'/>
      <target dev='vdb' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x08' slot='0x00' function='0x0'/>
    </disk>
    <disk type='block' device='disk'>
      <driver name='qemu' type='raw' cache='none' io='native' discard='ignore'/>
      <source dev='/dev/media/photo_raw'/>
      <target dev='vdc' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x0a' slot='0x00' function='0x0'/>
    </disk>
    <disk type='block' device='disk'>
      <driver name='qemu' type='raw' cache='none' io='native' discard='unmap' detect_zeroes='unmap'/>
      <source dev='/dev/vmvg/workdrive'/>
      <target dev='vdd' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x06' slot='0x00' function='0x0'/>
    </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='0x8'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0' multifunction='on'/>
    </controller>
    <controller type='pci' index='2' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='2' port='0x9'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
    </controller>
    <controller type='pci' index='3' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='3' port='0xa'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
    </controller>
    <controller type='pci' index='4' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='4' port='0xb'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x3'/>
    </controller>
    <controller type='pci' index='5' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='5' port='0xc'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x4'/>
    </controller>
    <controller type='pci' index='6' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='6' port='0xd'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x5'/>
    </controller>
    <controller type='pci' index='7' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='7' port='0xe'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x6'/>
    </controller>
    <controller type='pci' index='8' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='8' port='0xf'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x7'/>
    </controller>
    <controller type='pci' index='9' model='pcie-to-pci-bridge'>
      <model name='pcie-pci-bridge'/>
      <address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>
    </controller>
    <controller type='pci' index='10' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='10' port='0x10'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0' multifunction='on'/>
    </controller>
    <controller type='pci' index='11' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='11' port='0x11'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x1'/>
    </controller>
    <controller type='pci' index='12' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='12' port='0x12'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x2'/>
    </controller>
    <controller type='pci' index='13' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='13' port='0x13'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x3'/>
    </controller>
    <controller type='pci' index='14' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='14' port='0x14'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x4'/>
    </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:e1:40:10'/>
      <source bridge='bridge0'/>
      <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'/>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x08' slot='0x00' function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x0b' slot='0x00' function='0x0'/>
    </hostdev>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x08' slot='0x00' function='0x1'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x0c' slot='0x00' function='0x0'/>
    </hostdev>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x08' slot='0x00' function='0x3'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x0d' 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>
    <memballoon model='none'/>
    <rng model='virtio'>
      <backend model='random'>/dev/urandom</backend>
      <address type='pci' domain='0x0000' bus='0x0e' slot='0x00' function='0x0'/>
    </rng>
    <panic model='hyperv'/>
  </devices>
  <qemu:commandline>
    <qemu:arg value='-device'/>
    <qemu:arg value='ich9-intel-hda,bus=pcie.0,addr=0x1b'/>
    <qemu:arg value='-device'/>
    <qemu:arg value='hda-micro,audiodev=hda'/>
    <qemu:arg value='-audiodev'/>
    <qemu:arg value='pa,id=hda,server=/run/user/1000/pulse/native'/>
  </qemu:commandline>
</domain>

Before making any changes to your config, copy the entire xml configuration and back it up. You can do it in virt-manager. Just make sure to enable “xml editing” under “Preferences”.

Hope this helps.

1 Like
9

My CPU siblings were like yours meaning that I configured it wrong.

About the graphics card, I researched about it a lot could not find a solution, while there is actually an audio device on 0b:00.1 I can see it only if I force to see device on that address, meaning that it is not visible in virt manager. Anyway that is the graphics card without the audio entry.

Actually turns out the problem was on the hardware side, GPU was damaged at some point. (Today when I put it on an actual windows machine I saw in GPU Z that the Bandwith was down from 48 to only 8 GB/s). I changed the GPU with the same one only newer and now the performance is near native.

That shmem device is Scream (sound), think of it as looking glass only for sound.

Thanks for the tips dude, and thanks for the answer, I am going to mark it as solution.

10

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