KVM Notes
Summary
This document contains useful notes from user experience.
Notes
KVM guest multi CPU
When using RouterOS os primary OS on the router changing /system hardware settings will change kernel that is loaded at boot time effectively enabling or disabling SMP support in RouterOS. But using this setting in KVM guest does not work as intended, because in KVM guest configuration user can explicitly point what kernel to use, default setting is kernel="/boot/vmlinuz" that loads guest with non-SMP kernel.
Correct setting for multi CPU support is kernel="/boot/vmlinuz-smp"