K 10
svn:author
V 3
mav
K 8
svn:date
V 27
2015-03-30T07:11:49.551256Z
K 7
svn:log
V 406
MFC r280134:
Report ARAT (APIC-Timer-always-running) feature for virtual CPU.

This makes FreeBSD guest to not avoid using LAPIC timer, preferring HPET
due to worries about non-existing for virtual CPUs deep sleep states.

Benchmarks of usleep(1) on guest and host show such extra latencies:
 - 51us for virtual HPET,
 - 22us for virtual LAPIC timer,
 - 22us for host HPET and
 - 3us for host LAPIC timer.

END