I am evaluating combining my Workstation / gaming Rig with my NAS. I am trying to understand the performance hit by moving to a VM.
I am losing around 20% of my expected CPU performance in both multi and single threaded application.
my test system is:
Asrock EP2C602
2x e5-2670
32GB of Ram
GTX 960 past thought to the VM
when I test the system on a clean windows build (bare metal) I get a Cinebench R15 score of around 1980 (which is as expected)
when I move to a VM, assigning with only one CPU I would expect to get around 50% of this as I plan to use the other CPU for Other tasks. currently I am getting 750-820 in R15 (8cores / 16 threads) and the single core test performance is about the same reduction over expected.
I have isolated a complete CPU for this testing (the CPU that is directly connected to the GPU), however I get the same results on a VNC windows 10 install on the other CPU (without isolation). results are just as bad if give it all 16 cores (around 1600 scored). 4 cores / 8 threads net 400, so scaling looks constant, im just missing 400 points somewhere?
I have tips / tweaks set to performance with boost enabled. Win 10 power mode is set to performance.
the CPU looks to b boosting to 3.0Ghz (which is consistent with my BM testing)
I have played around with moving the emulations cores off the VM CPU to see if removing the overhead helps but with no impact. this had zero impact!
I get the feeling I am missing something as most of the videos on unraid show almost BM performance in most applications.
XML
<?xml version='1.0' encoding='UTF-8'?>
<domain type='kvm' id='5'>
<name>WIN.10.A</name>
<uuid>73c3fde2-1f62-2524-5410-b8c6087fa87c</uuid>
<description>Windows 10</description>
<metadata>
<vmtemplate xmlns="unraid" name="Windows 10" icon="windows.png" os="windows10"/>
</metadata>
<memory unit='KiB'>8388608</memory>
<currentMemory unit='KiB'>8388608</currentMemory>
<memoryBacking>
<nosharepages/>
</memoryBacking>
<vcpu placement='static'>8</vcpu>
<cputune>
<vcpupin vcpu='0' cpuset='0'/>
<vcpupin vcpu='1' cpuset='16'/>
<vcpupin vcpu='2' cpuset='2'/>
<vcpupin vcpu='3' cpuset='18'/>
<vcpupin vcpu='4' cpuset='4'/>
<vcpupin vcpu='5' cpuset='20'/>
<vcpupin vcpu='6' cpuset='6'/>
<vcpupin vcpu='7' cpuset='22'/>
<emulatorpin cpuset='8,24'/>
</cputune>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64' machine='pc-i440fx-3.1'>hvm</type>
<loader readonly='yes' type='pflash'>/usr/share/qemu/ovmf-x64/OVMF_CODE-pure-efi.fd</loader>
<nvram>/etc/libvirt/qemu/nvram/73c3fde2-1f62-2524-5410-b8c6087fa87c_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' check='none'>
<topology sockets='1' cores='4' 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='raw' cache='none'/>
<source file='/mnt/disks/Unassigned_SSD/WIN.10.A/vdisk1.img' index='2'/>
<backingStore/>
<target dev='hdc' bus='virtio'/>
<boot order='1'/>
<alias name='virtio-disk2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<source file='/mnt/user/isos/drivers/virtio-win-0.1.160-1.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='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>
<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='0x03' function='0x0'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:01:70:a7'/>
<source bridge='br0'/>
<target dev='vnet0'/>
<model type='virtio'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' 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-5-WIN.10.A/org.qemu.guest_agent.0'/>
<target type='virtio' name='org.qemu.guest_agent.0' state='connected'/>
<alias name='channel0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<input type='tablet' bus='usb'>
<alias name='input0'/>
<address type='usb' bus='0' port='1'/>
</input>
<input type='mouse' bus='ps2'>
<alias name='input1'/>
</input>
<input type='keyboard' bus='ps2'>
<alias name='input2'/>
</input>
<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='0x05' 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='0x06' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x00' slot='0x1a' function='0x0'/>
</source>
<alias name='hostdev2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</hostdev>
<memballoon model='none'/>
</devices>
<seclabel type='dynamic' model='dac' relabel='yes'>
<label>+0:+100</label>
<imagelabel>+0:+100</imagelabel>
</seclabel>
</domain>