On 2013-12-10, Hal Murray <[email protected]> wrote: > Does anybody have a URL for a page that describes how to setup a FreeBSD > system for timekeeping?
Use either chrony or ntpd. > > I've got a FreeBSD 9.1 system running on a 1.86 GHz Intel Atom chip. It > reports TSC-low is running at 14.584185 MHz and uses it for timekeeping. > > I googled for a while, but didn't find what I was looking for. I think You have not told us what you are looking for either. > it's tangled up with slowing down or stopping the CPU clock to save power. > I'm looking for a page that says do XXX to save power or do XXX to get a Do NOT use TSC for timekeeping then. You need a clock (eg I believe hpet for example) that does not slow down. TSC counts cpu cycles. > better clock, where XXX are probably sysctl settings. > kern.timecounter.choice: TSC-low(1000) ACPI-safe(850) i8254(0) HPET(950) > dummy(-1000000) > > > FreeBSD 8.0-RC1 running on a 2.8 GHz Celeron is using HPET. TSC (non low) > runs at 2793.170237 MHz. > kern.timecounter.choice: TSC(800) HPET(900) ACPI-safe(850) i8254(0) > dummy(-1000000) > I haven't figured out why it things HPET is better than TSC. > Because it does not change when the cpu goes into power conservation? _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
