Thanks for the quick replies, everybody! My comments below:
On Jun 22, 2005, at 2:39 PM, Poul-Henning Kamp wrote:
pll offset: 1.106e-06 s
pll frequency: 80.865 ppm
This is not indicative of good hardware.
OK. What sort of numbers would I look for on a good system? An order
of magnitude difference from these?
What does
sysctl kern.timecounter
say ?
% sysctl kern.timecounter
kern.timecounter.stepwarnings: 0
kern.timecounter.nbinuptime: 61716868
kern.timecounter.nnanouptime: 0
kern.timecounter.nmicrouptime: 9157
kern.timecounter.nbintime: 6824690
kern.timecounter.nnanotime: 6715023
kern.timecounter.nmicrotime: 109663
kern.timecounter.ngetbinuptime: 0
kern.timecounter.ngetnanouptime: 9147
kern.timecounter.ngetmicrouptime: 15113666
kern.timecounter.ngetbintime: 0
kern.timecounter.ngetnanotime: 0
kern.timecounter.ngetmicrotime: 4
kern.timecounter.nsetclock: 4
kern.timecounter.hardware: TSC
kern.timecounter.choice: TSC(800) i8254(0) dummy(-1000000)
kern.timecounter.tick: 1
%
The jitter warning thing is very likely if you load on the
machine which might disable interrupts for any amount of time.
It is a 200Mhz Pentium dedicated to the NTP role and doing nothing
other than ntpd and my login shells.
I will try some other motherboard/cpu combinations and compare the
results. Should I look at other platforms (Sun, etc) for better
interrupt service?
Do you have some ntptime or kerninfo output from a "good" piece of
hardware that I can use as a goal? I'm mostly guessing at this point
what is good performance and what is bad but increasing error
counters most always seem bad. :-)
Thanks,
Jim
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