Yo All! I just ran a 6 hour test of --disable-kernel-pll. See attached.
The left side before 18:45 is yesterday's ntpd. After that time is today's ntpd with --disable-kernel-pll. Nothing else changed. As the png shows, the frequency jitter declined, but the offset jitter increased. Since ntpd cares more about time than frequency, not a good trade off. The knerel PLL and the ntpd userspace PLL are supposed to be using the same algorithm and constants. Might be worth checking if the constants are still the same. Full data for --disable-kernel-pll here: https://pi3.rellim.com/12h/ I'll have 24 hour data Thursday night. Confounding the case is another RasPi that only changed the ntpd to today's code. It also shows increased time offset jitter, but not of the same magnitude as the userspace PLL test. It also shows increased frequency offset jitter, unlike the userpsace PLL test. So a bit hard to tease apart the two worsening results. Full data for the simple ntpd update here: https://pi2.rellim.com/12h/ RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 [email protected] Tel:+1 541 382 8588
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