Libvirt qemu-system-x86_64 on ppc64le no multi threading

[Daniel P. Berrangé]

On Mon, Aug 03, 2020 at 01:45:45PM +0000, Kim-Norman Sahm wrote:
> hi,
> 
> i’m running Debian 10 on POWER9 and would like to spawn x86_64 emulated VMs.
> The virtual machine is configured to run with 8 vpus but it’s very slow.
> On the host you can see that the qemu-system-x86_64 process is using just one core!
> 
> Ppc64le guests are using multi cores, so its looks like an config problem or software bug with the x86 emulator.

snip

> Does anybody knows this problem?

You've not mentioned what QMEU version or what libvirt version you have.

Historically though emulation was single threaded. Only with MTTCG has
it become multi-threaded and thus able to use all cores for vCPUs. THat
is a few years old now though, so most distros should have MTTCG in some
form or another if reasonably up2date.

Regards,
Daniel
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