model name : Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
On Thu, Jun 9, 2016 at 6:56 PM, Spam House <kthxplz...@gmail.com> wrote: > Milos - > > What CPU are you using? > > On Thu, Jun 9, 2016 at 11:43 AM, Milos Kaurin <milos.kau...@gmail.com> > wrote: > >> Yes, this keeps coming up now and again on this list. >> >> My solution was: >> >> 1. Buy a dedicated PCIE sound card >> 2. Pass it through to the guest >> 3. Route audio: mobo soundcard > guest soundcard >> >> In essence, the always-on guest would handle audio, but I would still >> have crackles (rarely), especially from the web browsers (host & guest). >> Games not so much. >> >> To fix crackles, I did the following: >> 1. In the kernel cmdline: Use hugepages, 16x1GB for the guest (16 for the >> host, 32 total) >> 2. In the kernel cmdline: Use cpuisol (6 cores for the gues, 2 for the >> host) >> 3. In the kernel cmdline: Use nohz_full and rcu_nocbs for the guest cores >> 4. In the virt XML: Use cputune, hugepages, cpu mode=host-passthrough >> with the correct topology >> 5. In the virt XML: iothreadpin and emulatorpin for the 2 host CPUs >> 6. In the virt XML: Use virtio wherever possible (net, block devices) >> >> I think I covered everything. If anyone else has any other tips, please >> let me know. >> >> >> >> Appenix >> >> >> My /etc/default/grub: >> >> GRUB_CMDLINE_LINUX="rhgb quiet intel_iommu=on iommu=pt kvm.ignore_msrs=1 >> rd.driver.pre=vfio-pci hugepagesz=1G default_hugepagesz=1G hugepages=16 >> nohz_full=1,2,3,5,6,7 rcu_nocbs=1,2,3,5,6,7 isolcpus=1,2,3,5,6,7" >> >> >> >> My XML: >> >> <domain type='kvm'> >> <name>Win10</name> >> <uuid>4bb72e5b-c886-425f-8280-b69755ebf054</uuid> >> <memory unit='KiB'>16777216</memory> >> <currentMemory unit='KiB'>16777216</currentMemory> >> <memoryBacking> >> <hugepages/> >> </memoryBacking> >> <vcpu placement='static'>6</vcpu> >> <iothreads>2</iothreads> >> <cputune> >> <vcpupin vcpu='0' cpuset='1'/> >> <vcpupin vcpu='1' cpuset='5'/> >> <vcpupin vcpu='2' cpuset='2'/> >> <vcpupin vcpu='3' cpuset='6'/> >> <vcpupin vcpu='4' cpuset='3'/> >> <vcpupin vcpu='5' cpuset='7'/> >> <emulatorpin cpuset='0,4'/> >> <iothreadpin iothread='1' cpuset='0'/> >> <iothreadpin iothread='2' cpuset='4'/> >> </cputune> >> <os> >> <type arch='x86_64' machine='pc-i440fx-2.4'>hvm</type> >> <loader readonly='yes' >> type='pflash'>/usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd</loader> >> <nvram>/var/lib/libvirt/qemu/nvram/Win10_VARS.fd</nvram> >> </os> >> <features> >> <acpi/> >> <apic/> >> <kvm> >> <hidden state='on'/> >> </kvm> >> <vmport state='off'/> >> </features> >> <cpu mode='host-passthrough'> >> <topology sockets='1' cores='3' threads='2'/> >> </cpu> >> <clock offset='localtime'> >> <timer name='rtc' tickpolicy='catchup'/> >> <timer name='pit' tickpolicy='delay'/> >> <timer name='hpet' present='no'/> >> </clock> >> <on_poweroff>destroy</on_poweroff> >> <on_reboot>restart</on_reboot> >> <on_crash>restart</on_crash> >> <pm> >> <suspend-to-mem enabled='no'/> >> <suspend-to-disk enabled='no'/> >> </pm> >> <devices> >> <emulator>/usr/bin/qemu-kvm</emulator> >> <disk type='block' device='disk'> >> <driver name='qemu' type='raw' cache='none' io='native'/> >> <source dev='/dev/sdb'/> >> <target dev='vda' bus='virtio'/> >> <boot order='2'/> >> <address type='pci' domain='0x0000' bus='0x00' slot='0x09' >> function='0x0'/> >> </disk> >> <controller type='pci' index='0' model='pci-root'/> >> <controller type='scsi' index='0' model='virtio-scsi'> >> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' >> function='0x0'/> >> </controller> >> <controller type='usb' index='0' model='none'/> >> <interface type='bridge'> >> <mac address='52:54:00:3e:c8:03'/> >> <source bridge='br0'/> >> <model type='virtio'/> >> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' >> function='0x0'/> >> </interface> >> <hostdev mode='subsystem' type='pci' managed='yes'> >> <source> >> <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/> >> </source> >> <address type='pci' domain='0x0000' bus='0x00' slot='0x0a' >> 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='0x00' slot='0x0b' >> function='0x0'/> >> </hostdev> >> <hostdev mode='subsystem' type='pci' managed='yes'> >> <source> >> <address domain='0x0000' bus='0x05' slot='0x00' function='0x0'/> >> </source> >> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' >> function='0x0'/> >> </hostdev> >> <hostdev mode='subsystem' type='pci' managed='yes'> >> <source> >> <address domain='0x0000' bus='0x06' slot='0x00' function='0x0'/> >> </source> >> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' >> function='0x0'/> >> </hostdev> >> <memballoon model='none'/> >> </devices> >> </domain> >> >> >> >> >> >> _______________________________________________ >> vfio-users mailing list >> vfio-users@redhat.com >> https://www.redhat.com/mailman/listinfo/vfio-users >> >> >
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