I use the host configuration: i7 7700k, Gigabyte 1070ti x2, Gigabyte z270 hd3

My cpu allocation is: 0 2 4 6
                                      1 3 5 7

gpu passthrough

I found that when I only open a virtual machine to play PUBG (the highest effect), the graphics card usage has been around 99%, the number of frames is also very high, and the physical machine is very close, but when the two virtual machines play at the same time PUBG (maximum effect), the two virtual machines graphics usage dropped to about 60%, in other words, the graphics performance can not be fully played, resulting in a much lower number of frames than the physical machine, some people encountered the performance of the video game Can not play the situation?

ps: When I use the test software to test graphics performance, the test scores of the graphics card and the physical machine is similar, occupancy rate can reach 99%.

are u using all cores on both VM´s ? 0-7 on both VM´s.

 

or splitting them ? like 0,1,2,3 VM1, 4,5,6,7 VM2. i experienced a better perfomrance by isolating the VM´s.

Edited December 19, 20178 yr by alturismo

16 hours ago, alturismo said:

are u using all cores on both VM´s ? 0-7 on both VM´s.

 

or splitting them ? like 0,1,2,3 VM1, 4,5,6,7 VM2. i experienced a better perfomrance by isolating the VM´s.

I tried what you said about the distribution method. It can improve my performance on a virtual machine game, but when the two virtual machines at the same time the game, gpu usage will decline, and this allocation of CPU is not completely isolated, will lead to the two virtual machines Affect each other (for example, when I am playing a game on a virtual machine, switching on and off the other one causes a certain amount of time on the virtual machine in the game).

 

I also ruled out the problem of insufficient power supply, I used a 1250w power supply.

 

I also compared the physical machine experiments, the same game environment, CPU occupancy rate of about 30% -40%, GPU occupancy rate has remained above 90%, which proves that I  use half a cpu should have sufficient performance Go play games Real time also proved that I use 0,2,4,6 virtual machine games, cpu occupancy rate of about 70%, from the numerical is reasonable, but the GPU occupancy rate has dropped to 60% -70%, which led to My game frames dropped significantly.

 

 

Thank you for your reply to me

Post the xmls of both vm, please. I'm not sure how you set things up from your answers. 

It is also worth pointing out that at least one core should be left available for unRAID to handle the VM’s.   It looks as if you may have tried to allocate all available cores to the VMs which is not a good idea.

14 hours ago, saarg said:

Post the xmls of both vm, please. I'm not sure how you set things up from your answers. 

<domain type='kvm'>
  <name>Windows 7</name>
  <uuid>b13759eb-3e36-1e72-d2b8-70a9d9f0efb2</uuid>
  <metadata>
    <vmtemplate xmlns="unraid" name="Windows 7" icon="windows7.png" os="windows7"/>
  </metadata>
  <memory unit='KiB'>15728640</memory>
  <currentMemory unit='KiB'>15728640</currentMemory>
  <memoryBacking>
    <nosharepages/>
  </memoryBacking>
  <vcpu placement='static'>4</vcpu>
  <cputune>
    <vcpupin vcpu='0' cpuset='0'/>
    <vcpupin vcpu='1' cpuset='2'/>
    <vcpupin vcpu='2' cpuset='4'/>
    <vcpupin vcpu='3' cpuset='6'/>
  </cputune>
  <os>
    <type arch='x86_64' machine='pc-q35-2.7'>hvm</type>
    <boot dev='hd'/>
  </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='2' threads='2'/>
  </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='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/mnt/user/isos/virtio-win-0.1.126-2.iso'/>
      <target dev='hdb' bus='sata'/>
      <readonly/>
      <address type='drive' controller='0' bus='0' target='0' unit='1'/>
    </disk>
    <controller type='usb' index='0' model='ich9-ehci1'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x7'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci1'>
      <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'>
      <master startport='2'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x1'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci3'>
      <master startport='4'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x2'/>
    </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='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>
    <controller type='virtio-serial' index='0'>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x02' function='0x0'/>
    </controller>
    <interface type='bridge'>
      <mac address='40:2c:29:d7:49:93'/>
      <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' xvga='yes'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x03' function='0x0'/>
    </hostdev>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x01' slot='0x00' function='0x1'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x04' function='0x0'/>
    </hostdev>
    <hostdev mode='subsystem' type='usb' managed='no'>
      <source>
        <vendor id='0x046d'/>
        <product id='0xc31c'/>
      </source>
      <address type='usb' bus='0' port='1'/>
    </hostdev>
    <hostdev mode='subsystem' type='usb' managed='no'>
      <source>
        <vendor id='0x0d8c'/>
        <product id='0x013c'/>
      </source>
      <address type='usb' bus='0' port='2'/>
    </hostdev>
    <hostdev mode='subsystem' type='usb' managed='no'>
      <source>
        <vendor id='0x1038'/>
        <product id='0x1384'/>
      </source>
      <address type='usb' bus='0' port='3'/>
    </hostdev>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x05' function='0x0'/>
    </memballoon>
  </devices>
</domain>

 

 

 

 

 

 

 

 

 

 

<domain type='kvm'>
  <name>Windows 72</name>
  <uuid>7dc13605-531c-a8ac-7c29-e45aff108961</uuid>
  <metadata>
    <vmtemplate xmlns="unraid" name="Windows 7" icon="windows7.png" os="windows7"/>
  </metadata>
  <memory unit='KiB'>15728640</memory>
  <currentMemory unit='KiB'>15728640</currentMemory>
  <memoryBacking>
    <nosharepages/>
  </memoryBacking>
  <vcpu placement='static'>4</vcpu>
  <cputune>
    <vcpupin vcpu='0' cpuset='1'/>
    <vcpupin vcpu='1' cpuset='3'/>
    <vcpupin vcpu='2' cpuset='5'/>
    <vcpupin vcpu='3' cpuset='7'/>
  </cputune>
  <os>
    <type arch='x86_64' machine='pc-q35-2.7'>hvm</type>
    <boot dev='hd'/>
  </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='2' threads='2'/>
  </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='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/mnt/user/isos/virtio-win-0.1.126-2.iso'/>
      <target dev='hdb' bus='sata'/>
      <readonly/>
      <address type='drive' controller='0' bus='0' target='0' unit='1'/>
    </disk>
    <controller type='usb' index='0' model='ich9-ehci1'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x7'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci1'>
      <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'>
      <master startport='2'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x1'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci3'>
      <master startport='4'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x2'/>
    </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='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>
    <controller type='virtio-serial' index='0'>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x02' function='0x0'/>
    </controller>
    <interface type='bridge'>
      <mac address='40:2c:c5:ca:10:5d'/>
      <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' xvga='yes'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x03' function='0x0'/>
    </hostdev>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x02' slot='0x00' function='0x1'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x04' function='0x0'/>
    </hostdev>
    <hostdev mode='subsystem' type='usb' managed='no'>
      <source>
        <vendor id='0x1038'/>
        <product id='0x1392'/>
      </source>
      <address type='usb' bus='0' port='1'/>
    </hostdev>
    <hostdev mode='subsystem' type='usb' managed='no'>
      <source>
        <vendor id='0x1532'/>
        <product id='0x021b'/>
      </source>
      <address type='usb' bus='0' port='2'/>
    </hostdev>
    <hostdev mode='subsystem' type='usb' managed='no'>
      <source>
        <vendor id='0x2b0d'/>
        <product id='0x0041'/>
      </source>
      <address type='usb' bus='0' port='3'/>
    </hostdev>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x05' function='0x0'/>
    </memballoon>
  </devices>
</domain>
 

Thank you for your reply to me

 

 

 

for starters, usually not recommended to use core 0... but your bigger issue is that you've got 2 vm's on the same physical cores which can often degrade overall performance. Especially if they are all trying to use core 0 as their own core 0 (including hyperthreads)

 

for now, change your cpu assignments for one vm to  0,1,4,5  and the other to 2,3,6,7 (assuming normal cpu assignment for this.) it  will contain the vm's on their own hyperthreaded pairs on the processor, and not stack them on top of each other.

 

more info here:

 

 

Edited December 21, 20178 yr by 1812

1 hour ago, 1812 said:

for starters, usually not recommended to use core 0... but your bigger issue is that you've got 2 vm's on the same physical cores which can often degrade overall performance. Especially if they are all trying to use core 0 as their own core 0 (including hyperthreads)

 

for now, change your cpu assignments for one vm to  0,1,4,5  and the other to 2,3,6,7 (assuming normal cpu assignment for this.) it  will contain the vm's on their own hyperthreaded pairs on the processor, and not stack them on top of each other.

 

more info here:

 

 

 

 

Thank you for your reply to me

 

 

This change of cpu really improve my cpu performance, but this did not improve my graphics performance.

On the CPU core 0 is not recommended to use the problem, I was in the two virtual machines at the same time when the game, not applicable to the core 0 that the virtual machine graphics performance is relatively low, do not use the core 0 will lead directly to the KVM Virtual machine performance?

The problem here as I see it, is that you are giving the VM's all cores. That leaves nothing left for unraid and qemu to use undisturbed. 

Try giving at least core 0 to unraid,maybe the hyperthread core also. 

On 2017/12/21 at 4:03 PM, saarg said:

The problem here as I see it, is that you are giving the VM's all cores. That leaves nothing left for unraid and qemu to use undisturbed. 

Try giving at least core 0 to unraid,maybe the hyperthread core also. 

Thank you for your answer, I will continue to try