Possible to Change Advanced VM Settings?

[yottabit]

The UI doesn't provide all of the KVM options available, some of which I would like to use:

• CPU pinning
• Machine type (i440FX v. Q35)

I have a guest running Ubuntu 20.04 and its load average is 0.19, but the host qemu-system-x86 process is running at 120%+.

I have read that switching the machine type can sometimes reduce the kvm overhead by up to 20%.

And CPU pinning can be beneficial for the application running in the VM that is not well multi-threaded.

Is there a stateful XML file somewhere that contains these configuration details? Or am I out of luck until they are expressed in the UI?

 

[Samuel Tai]

SCALE stores these in the configuration database, not an XML or JSON file somewhere. To modify the database, you'll need to make SCALE API calls.

See https://www.truenas.com/docs/api/scale_websocket_api.html#vm. Typically, this is done either from the shell using midclt call <API command>, or using curl.

 

[yottabit]

Aha cool, it may still be possible then! I'll start investigating. Thanks!

 

[__adrian]

any update on whether you found anything? just browsing through that api docs page, seems to only describe endpoints that the gui already exposes.

 

[yottabit]

any update on whether you found anything? just browsing through that api docs page, seems to only describe endpoints that the gui already exposes.

No, I never had a chance. I ended up just upgrading the CPUs. The speed bump was enough to satisfy for now.