Hi all, I'm currently in a trial of unRAID to see if I want to buy a key at the end, and I'm having some trouble that I hope I can get help with. I hope I am just forgetting something obvious here.
I've done GPU passthrough VM builds before, manually with great success. I did the whole thing by hand on my last rig and it worked great, with only a minimal performance hit. However, on my new build using unRAID, I'm getting just awful performance in games that I was able to kill with native Windows directly on the hardware. For example, with Windows 10 on bare metal, I was able to push 60+ FPS in Witcher 3, nearly max settings at 1440p. In the VM, I get 10-15 tops, and fluctuates wildly, and doesn't seem to really matter much what settings I use.
My new rig is a Ryzen 1700,
GTX 1080 (only GPU in the system, and I'm passing it through if that makes a difference)
32 GB DDR4 3200 MHz
3TB WD Red (currently the only disk in the array, has several shares on it)
512 GB SSD (which I'm passing directly to the Windows VM to use directly, no vdisk)
I have a feeling it's going to turn out to be something obvious that I'm forgetting, and I may even discover it myself now that I've made a forum post. Usually I end up solving my own problem, but not until RIGHT after I ask for help. But I'd appreciate any thoughts or suggestions of what could be causing this. Thanks!
And here's my VM XML:
<domain type='kvm'>
<name>Windows 10</name>
<uuid>4d8a2a93-2808-1687-73bf-31aa1aeaa10d</uuid>
<metadata>
<vmtemplate xmlns="unraid" name="Windows 10" icon="windows.png" os="windows10"/>
</metadata>
<memory unit='KiB'>16777216</memory>
<currentMemory unit='KiB'>16777216</currentMemory>
<memoryBacking>
<nosharepages/>
</memoryBacking>
<vcpu placement='static'>8</vcpu>
<cputune>
<vcpupin vcpu='0' cpuset='8'/>
<vcpupin vcpu='1' cpuset='9'/>
<vcpupin vcpu='2' cpuset='10'/>
<vcpupin vcpu='3' cpuset='11'/>
<vcpupin vcpu='4' cpuset='12'/>
<vcpupin vcpu='5' cpuset='13'/>
<vcpupin vcpu='6' cpuset='14'/>
<vcpupin vcpu='7' cpuset='15'/>
</cputune>
<os>
<type arch='x86_64' machine='pc-q35-2.7'>hvm</type>
<loader readonly='yes' type='pflash'>/usr/share/qemu/ovmf-x64/OVMF_CODE-pure-efi.fd</loader>
<nvram>/etc/libvirt/qemu/nvram/4d8a2a93-2808-1687-73bf-31aa1aeaa10d_VARS-pure-efi.fd</nvram>
</os>
<features>
<acpi/>
<apic/>
<hyperv>
<relaxed state='on'/>
<vapic state='on'/>
<spinlocks state='on' retries='8191'/>
<vendor_id state='on' value='none'/>
</hyperv>
</features>
<cpu mode='host-passthrough'>
<topology sockets='1' cores='8' threads='1'/>
</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='block' device='disk'>
<driver name='qemu' type='raw' cache='writeback'/>
<source dev='/dev/disk/by-id/ata-MKNSSDRE512GB_MK170421100356BF5'/>
<target dev='hdc' bus='virtio'/>
<boot order='1'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x03' function='0x0'/>
</disk>
<controller type='usb' index='0' model='nec-xhci'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' 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='dmi-to-pci-bridge'>
<model name='i82801b11-bridge'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1e' function='0x0'/>
</controller>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x02' function='0x0'/>
</controller>
<controller type='pci' index='2' model='pci-bridge'>
<model name='pci-bridge'/>
<target chassisNr='2'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:b1:3b:18'/>
<source bridge='br0'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x01' function='0x0'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<channel type='unix'>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x0b' slot='0x00' function='0x0'/>
</source>
<rom file='/mnt/user/isos/1080_BIOS.dump'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x04' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x0b' slot='0x00' function='0x1'/>
</source>
<address type='pci' domain='0x0000' bus='0x02' slot='0x05' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='usb' managed='no'>
<source>
<vendor id='0x046d'/>
<product id='0xc531'/>
</source>
<address type='usb' bus='0' port='1'/>
</hostdev>
<hostdev mode='subsystem' type='usb' managed='no'>
<source>
<vendor id='0x0c45'/>
<product id='0x7605'/>
</source>
<address type='usb' bus='0' port='2'/>
</hostdev>
<hostdev mode='subsystem' type='usb' managed='no'>
<source>
<vendor id='0x28de'/>
<product id='0x1142'/>
</source>
<address type='usb' bus='0' port='3'/>
</hostdev>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x06' function='0x0'/>
</memballoon>
</devices>
</domain>
