On Sun, 26 Feb 2017, Gary E. Miller wrote: > On Sun, 26 Feb 2017 14:29:59 +0100 > Achim Gratz <strom...@nexgo.de> wrote: > > > It should probably be mentioned that hardpps is not available even > > with the PPS API present on most distributions since it is > > incompatible with a tickless kernel, something that became standard > > somewhere in the 3.x line of Linux kernels ca. 2012. > > Ah, no. KPPS works better on kernels with a tick, but not incompatible > with tickless. And most tickless kernels distributed by distros have > the option at boot time to change the tick configuration. Certainly > RasPian is that way. > > Can you be more specific on a kernel that does not work?
>From drivers/pps/Kconfig: --------------------------------------------------------------------- config NTP_PPS bool "PPS kernel consumer support" depends on !NO_HZ_COMMON help This option adds support for direct in-kernel time synchronization using an external PPS signal. It doesn't work on tickless systems at the moment. --------------------------------------------------------------------- There's no reason in principle why it can't work on tickless kernels, but the current implementation is deficient. Fred Wright _______________________________________________ devel mailing list devel@ntpsec.org http://lists.ntpsec.org/mailman/listinfo/devel