我是KVM新手，我的图形性能很差。
主机：Asus UX305FA，带有迷你 Ubuntu 17.10 和i3窗口管理器。
来宾 1：Windows 10
以下是 的内容win10.xml：
<domain type='kvm'>
<name>win10</name>
<uuid>efd921e8-a8d9-4b22-8ada-3dd81afef678</uuid>
<memory unit='KiB'>2097152</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>2</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-artful'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<hyperv>
<relaxed state='on'/>
<vapic state='on'/>
<spinlocks state='on' retries='8191'/>
</hyperv>
<vmport state='off'/>
</features>
<cpu mode='host-model' check='partial'>
<model fallback='allow'/>
</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/kvm-spice</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/mnt/windata/KVM/Windows10slim.qcow2'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<source file='/mnt/windata/KVM/virtio-win-0.1.141.iso'/>
<target dev='hdb' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='0' target='0' unit='1'/>
</disk>
<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>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</controller>
<controller type='usb' index='0' model='nec-xhci'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</controller>
<interface type='network'>
<mac address='52:54:00:e5:34:ca'/>
<source network='default'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<channel type='spicevmc'>
<target type='virtio' name='com.redhat.spice.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<input type='tablet' bus='usb'>
<address type='usb' bus='0' port='1'/>
</input>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='spice' autoport='yes'>
<listen type='address'/>
<image compression='off'/>
</graphics>
<sound model='ich6'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</sound>
<video>
<model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<redirdev bus='usb' type='spicevmc'>
<address type='usb' bus='0' port='2'/>
</redirdev>
<redirdev bus='usb' type='spicevmc'>
<address type='usb' bus='0' port='3'/>
</redirdev>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</memballoon>
</devices>
</domain>
嘉宾 2 : Lubuntu 17.10
以下是 的内容lubuntu.xml：
<domain type='kvm'>
<name>lubuntu</name>
<uuid>077f9473-9834-472f-95e2-a101fb8e2867</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>2</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-artful'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<vmport state='off'/>
</features>
<cpu mode='custom' match='exact' check='partial'>
<model fallback='allow'>Broadwell-noTSX</model>
</cpu>
<clock offset='utc'>
<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/kvm-spice</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/var/lib/libvirt/images/lubuntu.qcow2'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hda' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<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>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</controller>
<controller type='usb' index='0' model='nec-xhci'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</controller>
<interface type='network'>
<mac address='52:54:00:f9:dc:35'/>
<source network='default'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<channel type='spicevmc'>
<target type='virtio' name='com.redhat.spice.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<input type='tablet' bus='usb'>
<address type='usb' bus='0' port='1'/>
</input>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='spice' autoport='yes'>
<listen type='address'/>
<image compression='off'/>
</graphics>
<sound model='ich6'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</sound>
<video>
<model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<redirdev bus='usb' type='spicevmc'>
<address type='usb' bus='0' port='2'/>
</redirdev>
<redirdev bus='usb' type='spicevmc'>
<address type='usb' bus='0' port='3'/>
</redirdev>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</memballoon>
</devices>
</domain>
作为显示器，我使用Spice，视频设置为 QXL。我在两个客人中都安装了 Spice 代理/客户端。
2位客人的表现不佳。体验很滞后，如果我播放 youtube 视频，它会有很多撕裂。此外，分辨率不会根据来宾窗口大小自动更改。
在同一台主机上，如果我在 Virtualbox 中运行 Win10 虚拟机，我将获得更好的图形性能和基于来宾窗口工作的自动分辨率。
我可以尝试什么来改善图形性能？
更新：正如@byte-commander 所建议的，我用 Debian 9 制作了一个新的虚拟机。在这种情况下，自动分辨率有效，但图形性能仍然很差。
来宾 3：Debian 9 以下是以下内容debian9.xml：
<domain type='kvm'>
<name>debian9</name>
<uuid>ca3ffe36-f956-4d7a-8dca-f8bd9fba123b</uuid>
<memory unit='KiB'>2097152</memory>
<currentMemory unit='KiB'>2097152</currentMemory>
<vcpu placement='static'>2</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-artful'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<vmport state='off'/>
</features>
<cpu mode='custom' match='exact' check='partial'>
<model fallback='allow'>Broadwell-noTSX</model>
</cpu>
<clock offset='utc'>
<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/kvm-spice</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/var/lib/libvirt/images/debian9.qcow2'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hda' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='usb' index='0' model='ich9-ehci1'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x7'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci1'>
<master startport='0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0' multifunction='on'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci2'>
<master startport='2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x1'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci3'>
<master startport='4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' 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>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</controller>
<interface type='network'>
<mac address='52:54:00:54:cd:79'/>
<source network='default'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<channel type='unix'>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<channel type='spicevmc'>
<target type='virtio' name='com.redhat.spice.0'/>
<address type='virtio-serial' controller='0' bus='0' port='2'/>
</channel>
<input type='tablet' bus='usb'>
<address type='usb' bus='0' port='1'/>
</input>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='spice' autoport='yes' listen='127.0.0.1'>
<listen type='address' address='127.0.0.1'/>
</graphics>
<sound model='ich6'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</sound>
<video>
<model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<redirdev bus='usb' type='spicevmc'>
<address type='usb' bus='0' port='2'/>
</redirdev>
<redirdev bus='usb' type='spicevmc'>
<address type='usb' bus='0' port='3'/>
</redirdev>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</memballoon>
</devices>
</domain>
更新 2： Debian VM的inxi添加和增加 RAM 到 2GB 的输出。
主持人inxi -Fxz：
System: Host: leaf Kernel: 4.15.0-041500-generic x86_64 bits: 64 gcc: 7.2.0 Desktop: i3 4.13
Distro: Ubuntu 17.10
Machine: Device: laptop System: ASUSTeK product: UX305FA v: 1.0 serial: N/A
Mobo: ASUSTeK model: UX305FA v: 1.0 serial: N/A
UEFI [Legacy]: American Megatrends v: UX305FA.213 date: 10/12/2015
Battery BAT0: charge: 37.6 Wh 95.6% condition: 39.3/45.0 Wh (87%) model: ASUSTeK ASUS status: Discharging
CPU: Dual core Intel Core M-5Y10c (-HT-MCP-) arch: Broadwell rev.4 cache: 4096 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 3990
clock speeds: max: 2000 MHz 1: 802 MHz 2: 798 MHz 3: 798 MHz 4: 798 MHz
Graphics: Card: Intel HD Graphics 5300 bus-ID: 00:02.0
Display Server: X.Org 1.19.5 drivers: modesetting (unloaded: fbdev,vesa)
Resolution: [email protected], [email protected]
OpenGL: renderer: Mesa DRI Intel HD Graphics 5300 (Broadwell GT2)
version: 4.5 Mesa 17.2.8 Direct Render: Yes
Audio: Card-1 Intel Wildcat Point-LP High Definition Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0
Card-2 Intel Broadwell-U Audio Controller driver: snd_hda_intel bus-ID: 00:03.0
Card-3 Blue Microphones Yeti Stereo Microphone driver: USB Audio usb-ID: 001-021
Sound: Advanced Linux Sound Architecture v: k4.15.0-041500-generic
Network: Card: Intel Wireless 7265 driver: iwlwifi bus-ID: 02:00.0
IF: wlp2s0 state: up mac: <filter>
Drives: HDD Total Size: 384.1GB (49.1% used)
ID-1: /dev/sda model: Micron_M600_MTFD size: 256.1GB temp: 39C
ID-2: /dev/sdb model: Name n/a size: 128.0GB temp: 0C
Partition: ID-1: / size: 40G used: 21G (55%) fs: ext4 dev: /dev/sda7
ID-2: swap-1 size: 16.97GB used: 0.61GB (4%) fs: swap dev: /dev/sda6
RAID: No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors: System Temperatures: cpu: 44.0C mobo: 27.8C
Fan Speeds (in rpm): cpu: 25500
Info: Processes: 238 Uptime: 13:58 Memory: 4391.3/7877.2MB Init: systemd runlevel: 5 Gcc sys: 7.2.0
Client: Shell (bash 4.4.121) inxi: 2.3.37
来宾 Debian 9 inxi -Fxz：
System: Host: debian Kernel: 4.9.0-6-amd64 x86_64 (64 bit gcc: 6.3.0) Desktop: Gnome 3.22.3 (Gtk 3.22.11-1)
Distro: Debian GNU/Linux 9 (stretch)
Machine: Device: qemu System: QEMU product: Standard PC (i440FX + PIIX 1996) v: pc-i440fx-artful
Mobo: N/A model: N/A BIOS: Sea v: 1.10.2-1ubuntu1 date: 04/01/2014
CPU(s): 2 Single core Intel Core (Broadwell no TSX)s (-HT-SMP-) cache: 32768 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3) bmips: 3990
clock speeds: max: 997 MHz 1: 997 MHz 2: 997 MHz
Graphics: Card: Red Hat QXL paravirtual graphic card bus-ID: 00:02.0
Display Server: X.org 1.19.2 driver: N/A tty size: 211x54 Advanced Data: N/A for root
Audio: Card Intel 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller
driver: snd_hda_intel bus-ID: 00:04.0
Sound: Advanced Linux Sound Architecture v: k4.9.0-6-amd64
Network: Card: Red Hat Virtio network device driver: virtio-pci v: 1 port: c0a0 bus-ID: 00:03.0
IF: ens3 state: up speed: -1 duplex: unknown mac: <filter>
Drives: HDD Total Size: 10.7GB (51.0% used)
ID-1: /dev/vda model: N/A size: 10.7GB
Partition: ID-1: / size: 8.8G used: 4.2G (50%) fs: ext4 dev: /dev/vda1
ID-2: swap-1 size: 1.07GB used: 0.00GB (0%) fs: swap dev: /dev/vda5
Sensors: None detected - is lm-sensors installed and configured?
Info: Processes: 156 Uptime: 26 min Memory: 1430.5/2004.2MB Init: systemd runlevel: 5 Gcc sys: N/A
Client: Shell (bash 4.4.121) inxi: 2.3.5
升级到 Ubuntu 18.04 解决了糟糕的图形性能。