From:	"Ulrich Windl" <ulrich.windl@rz.uni-regensburg.de>
To:	linux-kernel@vger.rutgers.edu
Date:	Fri, 5 Mar 1999 09:00:21 +0100
Subject: announce(i386, experimental): NANOKERNEL (with PPSkit) snapshot #5

Hello,

I just uploaded "PPSkit-0.6-i386-pre5.diff.gz" to the usual places 
(linux.kernel.org/pub/linux/daemons/ntp/PPS, ftp://pcphy4.physik.uni-
regensburg.de/pub/wiu09524/PPS).

This snapshot features clock_getres() similar to POSIX.4, and the 
routine is used to set time_precision. Debugging messages in the 
problem candidate, hardpps(), were improved, and a quick and dirty 
fix seems to work well (ntptime and ntp4.0.91f: stability 0.082ppm, 
jitter <5µs, precision 7.5µs, estimated error 1.5µs)

I also moved some time routines from i386/kernel/time.c to 
kernel/time.c, because they do not make much sense in the 
architecture dependent file.

Stickyness of TIME_ERROR has also been fixed. Setting the time no 
longer sets TIME_ERROR, instead it is deduced from STA_UNSYNC.

I have completed most of the important parts, but I'll have to check 
some details of hardpps with Dave Mills. I'll use this weekend to 
update documentation and utilities, so that a real release comes 
definitely closer.

I'll describe the changes made to the time stuff, requesting gurus 
for the other architectures to implement nanosecond timeoffsets. I'll 
try to merge most of the changes ready for use, but I can't test 
these architectures.

One current issue is: For compatibility <linux/sched.h> includes 
<linux/time.h> in my snapshot now. Therefore any change in the time 
stuff recompiles about everything (e.g. drivers/scsi/sd.c). As many 
parts don't really need the <linux/time.h>, I'm considering to take 
it away from <linux/sched.h>. Maybe I'll have to add it explicitly 
for some files. A compilation will show.

The time code changes are huge, but I think it was time for a major 
cleanup. Probably more a candidate for 2.3 than for 2.2, but I think  
we can extract some goodies for the stable kernel (if there's demand).

Regards,
Ulrich Windl


-
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/