Yo All! To follow up on my own mistake...
On Wed, 25 Jan 2017 16:52:58 -0800
"Gary E. Miller" <g...@rellim.com> wrote:
> Xeon: fuzz=0.000202, tick=0.000202
> skylake: fuzz=0.000109, tick=0.000109
> RasPi: fuzz=0.003, tick=0.003
> RasPi2: fuzz=0.001823, tick=0.001823
> RasPi3: fuzz=0.000937, tick=0.000937
> mac mini: fuzz=0.0005, tick=0.001
My eye slipped. sys_tick is greater than sys_fuzz.
> Anyone got the reverse case?
Does anyone ever see sys_fuzz > sys_tick?
Hmm, measure_tick_fuzz() in ntpd/ntp_proto.c ensures sys_fuzz <= sys_tick.
So that is answered. Can't happen.
systime.c has this odd code:
if (sys_tick > sys_fuzz)
quant = sys_tick;
else
quant = 1e-6;
Not sure why that last line is not quant = sys_fuzz. I distrust
magic constants. Not sure it even matters. Prolly for legacy
adjtime() that only support micro Seconds? Not gonna worry about it
if it is just old Macs.
RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
g...@rellim.com Tel:+1 541 382 8588
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"If you can’t measure it, you can’t improve it." - Lord Kelvin
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