Miroslav,
The extra complexity is not worth the benefit.
Dave
Miroslav Lichvar wrote:
On Mon, Nov 01, 2010 at 02:49:57PM +0000, David L. Mills wrote:
There is a very good reason. First, the kernel can an only be
switched between PLL and FLL mode discreetly, while the daemon has a
gradual transition between modes so that the poll interval can vary
seamlessly between 8 s and 36 hr. Second, the kernel PLL is most
useful to minimize sawtooth errors, and is no better than the daemon
loop to track incidental frequency noise. Seldom if ever is it
useful to switch to FLL mode at poll intervals less than 1024 s,
unless the incidental phase noise is less than a microsecond.
I know the kernel FLL is slightly different from the daemon FLL, but
from the clknetsim tests it looked like FLL at 64s polling interval
could be useful even with 100us phase noise.
In any case, would it make sense to use the shorter kernel FLL when
tinker allan is set to 8 or less? Similarly to the daemon loop, but
only with one step.
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