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I want to switch form my old Intel platform to new Ubuntu 18.04 LTS + Ryzen 2700 + Asus X470 F Gaminng mobo. Virtualization is a must for me. So after installing clean Ubuntu I've installed KVM + QEMU.

When I run Ubuntu 16.04 just live CD in virtual machine it is painfully slow. It turns on in about 5 minutes.

But running Ubuntu 18.04 live CD in virtual machine works as I expect it to be - super fast.

I have enabled IOMMU and SVM in bios and command kvm-ok says:

KVM acceleration can be used

I've tried to change Video to different modes (QLX, VGA etc) - nothing changes.

I've tried to change emulated CPU to Broadwell, Haswell, and few other options - nothing changes.

Any suggestions where to look to resolve this issue?

  • Does info kvm say hardware virtualization is in use? – dsstorefile1 Apr 30 '18 at 6:38
  • I'm not sure what your'e asking me for. But kvm-info says INFO: /dev/kvm exists KVM acceleration can be used also lscpu shows: Virtualization: AMD-V – netCreate Apr 30 '18 at 8:08
  • I was asking you to run a command in the QEMU monitor so the emulator itself tells you directly whether it's using the available hardware acceleration. kvm-info tells you whether acceleration is available but not whether QEMU is using it. – dsstorefile1 Apr 30 '18 at 8:09
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    I got into monitor and I got: kvm support: enabled – netCreate Apr 30 '18 at 13:17
  • You could take a look if you are cpu bound and if so in which of qemu's threads that is via pidstat -t -p <pid-of-qemu> - the share between guest/user/sys in that would often also indicate where to look next. – Christian Ehrhardt Apr 30 '18 at 14:08

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