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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