Retrofit from bug reports sent via unraid web UI:
Unraid VMs are slow to boot, and while they are typically normal after boot, a few times they are lagging during use. Core usage is limited to a single core during boot, and the core is maxed @ 100%.
These slow boots can take upwards of minutes, as opposed to normal boots of <10s.
This issue did not exist on 6.5.3 and exists on every build 6.6.0rc1 and onwards.
This issue appears to be limited to Threadripper chips?
The issue manifests itself about 75% of boot sequences. 25% of the time the system may boot normally.
How to reproduce:
Obtain a Threadripper build (possibly more than 8 cores are needed).
Update unraid to 6.5.3.
Boot into any VM. Most recommended is a Windows VM. Repeat this process multiple times. Note boot appears to be similar in performance to bare metal.
Update unraid to >=6.6.0rc1
Boot into the same VM multiple times. Note for the majority of boots, the spinning circle lags heavily. CPU usage hangs @ 100% on 1 core.
Please keep me posted if there is any testing I can do. I'm looking into how to compile unraid, but I believe I'm not incorporating all needed packages, and I can't seem to find any newer documentation on the process.