Public bug reported:
ubuntu as kvm guest couse more wakeups if it started without acpi.
Normally kernel will try to find aout the date of the BIOS and bcouse
kvm/qemu do not have DMI table it will fault and force start without
acpi.
Results of powertop:
kvm guest with acpi forced
Wakeups-from-idle per second : 107,1 interval: 15,0s
Top causes for wakeups:
55,2% ( 68,5) qemu-system-x86 : sys_timer_settime (posix_timer_fn)
8,2% ( 10,2) qemu-system-x86 : start_apic_timer (apic_timer_fn)
kvm guest without acpi
Wakeups-from-idle per second : 191,4 interval: 15,0s
Top causes for wakeups:
54,4% (168,3) qemu-system-x86 : sys_timer_settime (posix_timer_fn)
32,3% (100,0) qemu-system-x86 : __kvm_migrate_apic_timer (apic_timer_fn)
** Affects: linux-meta (Ubuntu)
Importance: Undecided
Status: New
--
acpi should be enabled by default for kvm guest
https://bugs.launchpad.net/bugs/183720
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