Improve the performance of the hpet timer in bhyve guests by making the
timer frequency a power of two. This changes the frequency from 10 to
16.7 MHz (2 ^ 24 HZ). Using a power of two avoids roundoff errors when
doing arithmetic in sbintime_t units.
Testing shows this can fix erratic ntpd behavior in guests using the
hpet timer (which is the default for multicore guests).
Reported by: bsam@
Modified:
head/sys/amd64/vmm/io/vhpet.c
In the future please respect MAINTAINERS and file a phab review for
code in this area.
later,
Peter.
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