Kernel PLL
Hal Murray
halmurray at sonic.net
Wed Jun 30 00:34:36 UTC 2021
> I'd like to hear more about this. It sounds like a separate issue from the
> damon split.
> Can't really respond to this as I don't understand the kernel PLL.
Mills wrote some kernel code that did a PLL off of a PPS signal. It, or its
descendents. is available in Linux, FreeBSD, and NetBSD. It is not configured
on any distros that I know about. When enabled, it works much better than ntpd.
Our current SHM or PPS processing is polled. I don't know if the "much
better" is because he got to pick better PLL parameters knowing that the
signal was a PPS rather than potentially junk data from network timing or if
the key is quick response time due to avoiding any polling delays.
So I'd like a way to avoid the polling delays.
One of these days, I'll make enough time to explore this area.
--
These are my opinions. I hate spam.
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