[vfio-users] Slowdown/stuttering since most recent fedora core updates

[Ethan Thomas]

After changing to host-passthrough at the suggestion of someone on reddit,
everything was working pretty well, I was getting usable if not stellar
framerates in games, audio had the intermittent crackle, but was generally
in sync. However I just allowed fedora core 23 to run its updates, thinking
nothing of it, and since then my windows 10 guest VM is very stuttery in
both audio, and framerate in games. It's even somewhat noticable in web
broswing. The audio also sometimes now has a weird echo which I previously
only heard when trying to pass through the card. Unfortunately, as I didnt
anticipate any trouble, I didn't pay attention to the previous or new
versions, but I know that it listed both system and virt-manager updates.

Any suggestions as to what to change would be welcome. The system is a Dual
Westmere Xeon, the guest GPU (a Radeon 260x) is on the same node as the
CPUs which are pinned to it. The USB3 card is also on that node. All other
PCI-E cards are on the other node. The only change I've made to the XML
since the update was to change the version of i440fx specified, which I
changed to match what a newly generated virt-manager VM had after the
problem started.

Additionally, but unrelated I'd like to be able to hear guest audio without
the virt-manager window open, and to remove the virtual video card, however
when I remove the spice video in a bios mode VM the machine never boots.
I'd appreciate any relevant suggestions there too, as ideally I want to
entirely drop spice.


XML follows:

<domain type='kvm'>
      <name>windows10</name>
  <uuid>835693f3-f65c-4ced-b6c6-be41896621f3</uuid>
          <memory unit='KiB'>16777216</memory>
  <currentMemory unit='KiB'>16777216</currentMemory>
  <vcpu placement='static' cpuset='4-7,12-15'>8</vcpu>
  <os>
    <type arch='x86_64' machine='pc-i440fx-2.6'>hvm</type>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
    <hyperv>
      <relaxed state='on'/>
          <vapic state='on'/>
  <spinlocks state='on' retries='8191'/>
</hyperv>
<vmport state='off'/>
  </features>
  <cpu mode='host-passthrough'>
    <topology sockets='1' cores='4' threads='2'/>
  </cpu>
  <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>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='threads'/>
      <source dev='/dev/guest_lvm/Windows7-clone'/>
      <target dev='hda' bus='ide'/>
      <boot order='2'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <target dev='hdb' bus='ide'/>
      <readonly/>
      <boot order='1'/>
      <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='0x06'
function='0x7'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci1'>
      <master startport='0'/>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x0' multifunction='on'/>
        </controller>
    <controller type='usb' index='0' model='ich9-uhci2'>
      <master startport='2'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x1'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci3'>
      <master startport='4'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x2'/>
    </controller>
    <controller type='pci' index='0' model='pci-root'/>
    <controller type='ide' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01'
function='0x1'/>
    </controller>
    <interface type='bridge'>
      <mac address='52:54:00:6e:ac:99'/>
      <source bridge='br0'/>
      <model type='e1000'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
    </interface>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
    <graphics type='spice' autoport='yes'/>
    <sound model='ich6'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
    </sound>
    <video>
      <model type='cirrus' vram='16384' heads='1' primary='yes'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02'
function='0x0'/>
    </video>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x84' slot='0x00' function='0x1'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08'
function='0x0'/>
    </hostdev>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x84' slot='0x00' function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x0'/>
    </hostdev>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x83' slot='0x00' function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x09'
function='0x0'/>
    </hostdev>
    <hostdev mode='subsystem' type='usb' managed='yes'>
      <source>
        <vendor id='0x0bda'/>
        <product id='0x0151'/>
      </source>
    </hostdev>
    <redirdev bus='usb' type='spicevmc'>
    </redirdev>
    <redirdev bus='usb' type='spicevmc'>
    </redirdev>
    <memballoon model='virtio'>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x07'
function='0x0'/>
        </memballoon>
      </devices>
   </domain>
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