Newsgroups: comp.protocols.time.ntp
Subject: announce: nanokernel for Linux (PPSkit-0.6.0)
Reply-to: Ulrich Windl <+DELETE_THIS+Ulrich.Windl@rz.uni-regensburg.de>
--text follows this line--
Hello I'm happy to let this off:
PPSkit-0.6.0 for Linux-2.2.5 has been released! This new kit features
nanosecond time resolution (at least in theory) as well as new NTP
kernel routines. The performance seems interesting enough. See the
plots found in nanotest.tgz!
Unfortunately it seems "pcphy4" is down this morning, and I can't
physically reach it. Head for linux.kernel.org instead.
So here's the NEWS:
+ Updated BUGS about the ``mysterious jitter'' effect. Updated patch
for Linux-2.2.5 after extensive debugging runs. Several tests passed
without problems.
+ ``adjtimex()'' accepts any offset for ``MOD_OFFSET'', but
``hardupdate()'' will clamp the offsets.
+ Fixed bug with possibly persistent ``TIME_ERROR'' in ``adjtimex()''.
Moved time functions that are not architecture dependent to common
``kernel/time.c''.
+ Added nanosecond time resolution (at least for i386 architecture).
+ Fixed problem in ``arch/i386/kernel/time.c'' when ``CONFIG_X86_TSC''
was defined, but the processor was buggy (uninitialized variables
would be used then).
+ Major cleanups with renaming: instead of calling ``get_fast_time()''
you are expected to use ``get_exact_time()'' now (the ``fast''
version wasn't faster than the ``normal'' version). Likewise the
``slow'' versions are called ``poor'' now. To avoid future
confusion, ``[get]timeoffset'' has been renamed to ``microtime'',
because it returns microsecods. Funtions returning nanoseconds will
have ``nanotime'' instead. ``<linux/time.h>'' won't include
``<linux/timex.h>'' any longer; only ``<asm/timex.h>'' will be
included. ``<linux/timex.h>'' will only include the NTP interface
stuff.
+ Updated serial driver to use ``do_clock_gettime()''. Fixed memory
leak associated with ``CIOGETEV''.
+ Added new POSIX.4 compatible functions ``do_clock_gettime()'',
``do_clock_settime()'', and ``do_clock_getres()'' that deal with
nanoseconds. Several related cleanups.
+ Merged the new ``nanokernel'' stuff into ``kernel/time.c'' (took
over 4 hours without being complete). Several cleanups and changes
done.
+ Merged the new ``nanokernel'' stuff into ``<include/linux/timex.h>''.
As some new bit definitions clash with older Linux extensions, the
latter had to be relocated. This will definitely break binary
compatibility (``adjtime()'' is affected), so that I'll possibly
clean up all the old mess. ``<timex.h>'' is purely for
``adjtimex()'' now.
+ Updated ``INSTALL'' about xntp. Updated ``enable_pps.c'' to support
new nanokernel. Added several new options. Completely rewritten
logic.
To complete it, here's an LSM entry:
Begin3
Title: PPSkit
Version: 0.6.0
Entered-date: 1999-04-07
Description: kernel time patch for NTP (RFC1305) and PPS support
(RFC1589)
against Linux 2.2.5+ (kernel patch, documentation, test
programs)
Keywords: NTP, PPS, kernel, RFC1305, RFC1589, xntp, time, clock,
pulse-per-second, synchronization, calibration, adjtimex,
nanoseconds, POSIX.4, nanokernel
Author: Ulrich.Windl@rz.uni-regensburg.de (Ulrich Windl)
Maintained-by: Ulrich.Windl@rz.uni-regensburg.de (Ulrich Windl)
Primary-site: linux.kernel.org /pub/linux/daemons/ntp/PPS
75kB PPSkit-0.6.0.tar.gz
Alternate-site:
Original-site: pcphy4.physik.uni-regensburg.de /pub/wiu09524/PPS
PPSkit-0.6.0.tar.gz
Platform: RS232-compatible precision pulse-per-second with an error
less than 500PPM (0.0005%, 0.5ms)
Copying-policy: GPL, but payment welcome!
End
As a special note: I broke the sparc clock due to my lack of assembly
knowledge for the SPARC. In general, all architectures other than
i386 and more exotic subsystems and drivers may be broken. After all
it's a "dot zero" release. Enjoy anyway!
Regards,
Ulrich
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/