[LinuxPPS] Reoirt on linuxPPS.

[clemens at dwf.com]

This is a report on the current patch
        ntp-pps-2.6.31-rc1
applied to 
	linux-2.6.31.5
on a
        3GHz Pentium 4
running
        Fedora 11

I am running with ntp version
        ntp-4.2.5p234-RC

which I compiled under the above linux.
I have also copied timepps.h and pps.h from 2.6.35.5 to the /usr/include
(I dont think that pps.h is necessary,- mabe for one of my diagnostics... 

---

In any case, the linuxPPS has the problem mentioned in previous notes to this
list, in that with only ASSERT set, I am seeing both ASSERT and CLEAR events.
This is not a really big problem for the oncore driver, tho it causes an error
message every second when the CLEAR event is seen.  My e-mail about this 
problem came too late for it to have been fixed in the current patch.

---

The reason for going to Fedora11 was to get to glibc 2.10.1, and it is my
understanding that to get nanosecond timing you need this library.

The kernel sources do have

	#define SHIFT_PLL 2

in timex.h, which was also one of the things that was mentioned as being
desirable.  

Interestingly, I cant say that I saw any faster 'lock up' of the ntp with this
variable set from 4 -> 2, than I have seen before.

---

I have been running now for several hours with the above environment,
and I THOUGHT this was all I needed to get to nano-second timing.  But as 
far as I can tell, Im still seeing microsecond time.

How can I tell?

A grep of my ntp config.h shows the following:

grep ONCORE config.h
#define CLOCK_ONCORE 1
#define ONCORE_SHMEM_STATUS 1

grep PPS config.h
/* PPS interface? */
/* #undef CLOCK_PPS720 */
/* Do we have the PPS API per the Draft RFC? */
#define HAVE_PPSAPI 1
/* #undef HAVE_STRUCT_PPSCLOCKEV */
/* #undef HAVE_SYS_PPSCLOCK_H */
/* #undef HAVE_SYS_PPSTIME_H */
/* #undef HAVE_SYS_TIMEPPS_H */
#define HAVE_TIMEPPS_H 1
/* Do we have the TIOCGPPSEV ioctl (Solaris)? */
/* #undef HAVE_TIOCGPPSEV */
/* Do we have the TIOCSPPS ioctl (Solaris)? */
/* #undef HAVE_TIOCSPPS */
/* #undef PPS */
/* PARSE kernel PLL PPS support */
/* #undef PPS_SYNC */

grep NANO config.h
/* #undef TICKADJ_NANO */
/* #undef TICK_NANO */

is it the NANO variables that are not being set by configure?

In any case, I would appreciate comments by anyone that has 
nano-second timing working.

-- 
                                        Reg.Clemens
                                        reg at dwf.com