[time-nuts] Using Allan Plots, was(LPRO-101 with Brooks Shera's GPS locking circuit)

Poul-Henning Kamp phk at phk.freebsd.dk
Mon Dec 18 06:09:42 EST 2006


In message <20061218.112305.1155416385.cfmd at bredband.net>, Magnus Danielson wri
tes:

>The quickest way to disclose crosstalk as an issue is to
>have two stable sources be near beating while logging the timings. One of these
>may be the time-base.

I have used such a "vernier" setup to measure stuff in the FreeBSD kernel
and once you get the setup right, the reproducibility is very good.
But until then your numbers will look very random.


-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.



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