[Performance issues when passing through entire nvme controller]

On 7/5/2020 at 7:30 AM, widdefmh said:

Well, after a lot of googling I can answer my own question.

For me, this did the trick:

To my domain tag, add xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'

so it looks like this:

<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>

And in the end om the domain tag (in the bottom of the xml), add this:

<qemu:commandline>
    <qemu:arg value='-cpu'/>
    <qemu:arg value='host,kvm=off,hv_relaxed,hv_spinlocks=0x1fff,hv_vapic,hv_time,hv_vendor_id=Microsoft'/>
  </qemu:commandline>

After adding this I get the following results in AS SSD:

 

 

Very close to bare metal performance!! And my vm is blazing fast! Can't tell I'm running in a vm or bare metal!

I get a warning in the logs: This family of AMD CPU does not support hyperthreading(2) but does not seem to have an effect,

 

 

I have also tweaked the following tag:

<clock offset='localtime'>
    <timer name='rtc' tickpolicy='catchup'/>
    <timer name='pit' tickpolicy='delay'/>
    <timer name='hpet' present='yes'/>
  </clock>

where i changed hpet to yes to get the cpu down a bit in idle mode.

 

Hope this can help anyone else that have performance issues in a vm and where the vm feels slow and sluggish. Like night and day here now.

It worked, thanks! And where did you find the answer? (just curious, Im noob😂)

[Graphics Passthrough works in Seabios but not OVMF.]

Same question here. last Re has been "Google translated", sry