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Hi,
i have arch x86_64 with a Win10 guest. The system is a AMD Ryzen 7 7700X 8-Core Processor on a MSI Pro X670-P Mainboard. Full qemu config at the end of the post.
The main graphics is on passthrough via virtio and works fine, storage and ram do well too, as confirmed by a passmark on the guest.
Now the problem is cpu multithread performance. Cpu single thread is great, if i am to believe passmark, but everything else in the cpu test is abysmal. A game with good diagnostic info (Path of exile) confirms that i am cpu bound, not gpu or ram.
I selected host-passthrough, then added some tuning as suggested in (https://wiki.archlinux.org/title/PCI_pa … PU_pinning), current config is:
<cpu mode="host-passthrough" check="none" migratable="on"/>
<vcpu placement="static">8</vcpu>
<iothreads>1</iothreads>
<cputune>
<vcpupin vcpu="0" cpuset="4"/>
<vcpupin vcpu="1" cpuset="5"/>
<vcpupin vcpu="2" cpuset="6"/>
<vcpupin vcpu="3" cpuset="7"/>
<vcpupin vcpu="4" cpuset="12"/>
<vcpupin vcpu="5" cpuset="13"/>
<vcpupin vcpu="6" cpuset="14"/>
<vcpupin vcpu="7" cpuset="15"/>
<emulatorpin cpuset="0,8"/>
<iothreadpin iothread="1" cpuset="0,8"/>
</cputune>
With lscpu saying this:
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE MAXMHZ MINMHZ MHZ
0 0 0 0 0:0:0:0 ja 5572,2651 3000,0000 4688,2012
1 0 0 1 1:1:1:0 ja 5572,2651 3000,0000 2698,2600
2 0 0 2 2:2:2:0 ja 5572,2651 3000,0000 2800,9231
3 0 0 3 3:3:3:0 ja 5572,2651 3000,0000 2688,6731
4 0 0 4 4:4:4:0 ja 5572,2651 3000,0000 2672,0549
5 0 0 5 5:5:5:0 ja 5572,2651 3000,0000 4935,6909
6 0 0 6 6:6:6:0 ja 5572,2651 3000,0000 5034,3428
7 0 0 7 7:7:7:0 ja 5572,2651 3000,0000 2676,2170
8 0 0 0 0:0:0:0 ja 5572,2651 3000,0000 5225,1519
9 0 0 1 1:1:1:0 ja 5572,2651 3000,0000 2669,4041
10 0 0 2 2:2:2:0 ja 5572,2651 3000,0000 2674,0049
11 0 0 3 3:3:3:0 ja 5572,2651 3000,0000 2669,1250
12 0 0 4 4:4:4:0 ja 5572,2651 3000,0000 2669,1709
13 0 0 5 5:5:5:0 ja 5572,2651 3000,0000 5336,7471
14 0 0 6 6:6:6:0 ja 5572,2651 3000,0000 5196,8672
15 0 0 7 7:7:7:0 ja 5572,2651 3000,0000 3652,9170
Performance was bad without tuning, with only the vcpupin commands and as is now.
What other diagnostics could i do to find out what is wrong? Are any other logs useful? Any tips if i should experiment with more cores, less cores, only physical cores (0-7 should be physical, 8-15 hyperthread, correct?)?
<domain type="kvm">
<name>win10</name>
<uuid>redacted</uuid>
<metadata>
<libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0">
<libosinfo:os id="http://microsoft.com/win/11"/>
</libosinfo:libosinfo>
</metadata>
<memory unit="KiB">33554432</memory>
<currentMemory unit="KiB">33554432</currentMemory>
<vcpu placement="static">8</vcpu>
<iothreads>1</iothreads>
<cputune>
<vcpupin vcpu="0" cpuset="4"/>
<vcpupin vcpu="1" cpuset="5"/>
<vcpupin vcpu="2" cpuset="6"/>
<vcpupin vcpu="3" cpuset="7"/>
<vcpupin vcpu="4" cpuset="12"/>
<vcpupin vcpu="5" cpuset="13"/>
<vcpupin vcpu="6" cpuset="14"/>
<vcpupin vcpu="7" cpuset="15"/>
<emulatorpin cpuset="0,8"/>
<iothreadpin iothread="1" cpuset="0,8"/>
</cputune>
<os firmware="efi">
<type arch="x86_64" machine="pc-q35-8.0">hvm</type>
<firmware>
<feature enabled="no" name="enrolled-keys"/>
<feature enabled="yes" name="secure-boot"/>
</firmware>
<loader readonly="yes" secure="yes" type="pflash">/usr/share/edk2/x64/OVMF_CODE.secboot.4m.fd</loader>
<nvram template="/usr/share/edk2/x64/OVMF_VARS.4m.fd">/var/lib/libvirt/qemu/nvram/win10_VARS.fd</nvram>
<boot dev="hd"/>
</os>
<features>
<acpi/>
<apic/>
<hyperv mode="custom">
<relaxed state="on"/>
<vapic state="on"/>
<spinlocks state="on" retries="8191"/>
</hyperv>
<vmport state="off"/>
<smm state="on"/>
</features>
<cpu mode="host-passthrough" check="none" migratable="on"/>
<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" discard="unmap"/>
<source file="/var/lib/libvirt/images/win10.qcow2"/>
<target dev="sda" bus="sata"/>
<address type="drive" controller="0" bus="0" target="0" unit="0"/>
</disk>
<disk type="file" device="cdrom">
<driver name="qemu" type="raw"/>
<source file="/home/voller/Downloads/Win10_22H2_EnglishInternational_x64.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-root-port">
<model name="pcie-root-port"/>
<target chassis="7" port="0x16"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x6"/>
</controller>
<controller type="pci" index="8" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="8" port="0x17"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x7"/>
</controller>
<controller type="pci" index="9" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="9" port="0x18"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x0" multifunction="on"/>
</controller>
<controller type="pci" index="10" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="10" port="0x19"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x1"/>
</controller>
<controller type="pci" index="11" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="11" port="0x1a"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x2"/>
</controller>
<controller type="pci" index="12" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="12" port="0x1b"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x3"/>
</controller>
<controller type="pci" index="13" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="13" port="0x1c"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x4"/>
</controller>
<controller type="pci" index="14" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="14" port="0x1d"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x5"/>
</controller>
<controller type="sata" index="0">
<address type="pci" domain="0x0000" bus="0x00" slot="0x1f" function="0x2"/>
</controller>
<controller type="virtio-serial" index="0">
<address type="pci" domain="0x0000" bus="0x03" slot="0x00" function="0x0"/>
</controller>
<interface type="network">
<mac address="52:54:00:3e:d1:c3"/>
<source network="default"/>
<model type="e1000e"/>
<address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0"/>
</interface>
<serial type="pty">
<target type="isa-serial" port="0">
<model name="isa-serial"/>
</target>
</serial>
<console type="pty">
<target type="serial" port="0"/>
</console>
<input type="evdev">
<source dev="/dev/input/by-id/usb-046a_010d-event-kbd" grab="all" grabToggle="ctrl-ctrl" repeat="on"/>
</input>
<input type="evdev">
<source dev="/dev/input/by-id/usb-046a_010d-if02-event-mouse"/>
</input>
<input type="mouse" bus="ps2"/>
<input type="keyboard" bus="ps2"/>
<sound model="ich9">
<codec type="micro"/>
<audio id="1"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x1b" function="0x0"/>
</sound>
<audio id="1" type="pulseaudio" serverName="/run/user/1000/pulse/native"/>
<video>
<model type="none"/>
</video>
<hostdev mode="subsystem" type="pci" managed="yes">
<source>
<address domain="0x0000" bus="0x01" slot="0x00" function="0x0"/>
</source>
<address type="pci" domain="0x0000" bus="0x05" slot="0x00" function="0x0"/>
</hostdev>
<hostdev mode="subsystem" type="pci" managed="yes">
<source>
<address domain="0x0000" bus="0x01" slot="0x00" function="0x1"/>
</source>
<address type="pci" domain="0x0000" bus="0x06" slot="0x00" function="0x0"/>
</hostdev>
<watchdog model="itco" action="reset"/>
<memballoon model="virtio">
<address type="pci" domain="0x0000" bus="0x04" slot="0x00" function="0x0"/>
</memballoon>
</devices>
</domain>
Last edited by screenfox (2023-05-23 10:27:46)
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Solved!
I thought it had to be useless, but adding
<topology sockets="1" dies="1" cores="4" threads="2"/>
to the <cpu> section fixed the problem.
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