Hi. I used geekbench benchmark. Here is my general result: https://browser.geekbench.com/v4/cpu/8134716 And here after cpu performance drop: https://browser.geekbench.com/v4/cpu/8134665
CPU performance drop is present right after starting VM with *-IBRS profile and restores only with CPU power reset (reboot or suspend/resume). Even stopping all VM's not solves the problem. So your problem is stopping the VM with *-IBRS can not restore the host CPU
http://bugzilla.suse.com/show_bug.cgi?id=1092035
http://bugzilla.suse.com/show_bug.cgi?id=1092035#c5
Fei Li
I checked this many times and I am 100% sure that it is caused by VM with this profile. There are no other workloads on the host, but CPU is almost two times slower.
And as I said IvyBridge profile without IBRS works just fine.
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