[time-nuts] GPS message jitter (was GPS for Nixie Clock)

Chris Albertson albertson.chris at gmail.com
Sun Jul 17 18:13:47 EDT 2016

Can't you take care of this in the build system?  I never go near
Windows, the last version I used was Win 95.  But on other systems I
always use something like the GNU Auto tools cmake or whatever and
part of the process is to check for the availability of each system
call and library and then the source is built using what's on that
specific machine.   I'd guess that there is something like this in
Windows.  Is GNU Autoconf ported to Windows?  If so then use
QueryPerformanceCounter() if it is available.  It seems much cleaner
to that care of this kind off thing in the build process

On Sun, Jul 17, 2016 at 2:23 PM, Mark Sims <holrum at hotmail.com> wrote:
> Heather's gotta work with XP (and maybe Win98)...  too many people (including me) run it on old trashy laptops, so no fancy pants new fangled Windoze calls allowed...
> In the past I've avoided the use of QueryPerformanceCounter due to potential issues with AMD processors, multi-core processors and multi-processor systems,  inaccurate/invalid reported CPU clock frequency (TSC tick count divisor) values,  variable clock rate systems, etc.   I'm now back to using it, but have added an option for switching back to GetTickCount() and it's 16 msec granularity.  I'm getting very good results so far.
> ---------------------------
>> You can also use the QueryPeformanceCounter and related functions for better precision.
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Chris Albertson
Redondo Beach, California

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