Hi,
I'm testing chrony (current git) with two GPS reference clocks, but am
suffering from chrony moving between the two equally good sources as
reference clock.
It would be nice with an option akin to the ntpd 'prefer' to force one of
the two (when it is an eligible source, i.e. OK for sync
I'm testing chrony (current git) with two GPS reference clocks, but am
suffering from chrony moving between the two equally good sources as
reference clock.
In what sense suffering? Those two clocks should be equivalent to better than
a microsecond if you are using pps. If not, then it might wel
Hi,
I could not find a command in chronyc to dump all the currently active
data points used in the linear fit for a source. This list together with
the residuals would be nice to see what chronyd is up to. For monitoring,
I'm using (and quite happy with):
watch -n 1 "./chronyc sources ; .
On Fri, 11 Dec 2009, Bill Unruh wrote:
On Fri, 11 Dec 2009, Håkan Johansson wrote:
Hi,
I could not find a command in chronyc to dump all the currently active data
points used in the linear fit for a source. This list together with the
residuals would be nice to see what chronyd is up to
It seems newer versions of ntpd sends client requests with version set to
4, that therefore are ignored by chronyd only accepting 3. At least the
basic packet format looks the same, so one could accept those and send
responses?
Cheers,
Håkan
Hi,
ntpd creates the shm refclock segments 2 and 3 with permissions 0666
(previously 0777), allowing also non-root users to provide synchronisation
data when these segments are set up. The attached patch changes chrony to
do that to (currently 0700 for all segments). It also changes the
pe
provide reference data. This is useful for the further testing of gpsd
I am doing, and the need to modify/restart gpsd doing that.
Cheers,
Håkan
On Mon, 25 Jan 2010, Håkan Johansson wrote:
Hi,
ntpd creates the shm refclock segments 2 and 3 with permissions 0666
(previously 0777
Ok, could it perhaps be made an explicit option of the refclock? (The
sysadmins were happy to not have to change more than the config file for
the few machines in question. :) )
Cheers,
Håkan
On Tue, 26 Jan 2010, Miroslav Lichvar wrote:
On Mon, Jan 25, 2010 at 09:48:57PM +0100, Håkan
In the latest git the permissions can now be specified with :perm=666.
Great!
Perhaps and the output of strtol(s, NULL, 8) with 0666 to prevent the
user from setting any other flags by mistake.
Cheers,
Håkan
Hi,
I have a system with a rather bad internal clock, unstable with respect to
temperature or voltage. Without load the frequency is about 80 ppm slow,
with 100 % system load it is 10 ppm slow.
Anyhow, there is one GPS connected, and quite a few network time sources.
When load is stable, t
On Tue, 2 Feb 2010, Miroslav Lichvar wrote:
On Sun, Jan 31, 2010 at 11:51:02PM +0100, Håkan Johansson wrote:
To avoid having to do that, I'd like to propose something like:
If a new system (B) is to be elected reference source, taking over
from an old (A), then B must have made its
It seems the SHM refclocks are named (indexed) by their appearance in the
config file and not by the ntpshm block they correspond to. Having e.g.
refclock SHM 3:perm=666 filter 63
refclock SHM 2:perm=666 filter 63
refclock SHM 1 filter 63 offset 0.0 delay 1e-4
I still get a list like:
SHM0
On Mon, Feb 01, 2010 at 07:42:34AM +0100, Håkan Johansson wrote:
It seems the SHM refclocks are named (indexed) by their appearance
in the config file and not by the ntpshm block they correspond to.
Having e.g.
refclock SHM 3:perm=666 filter 63
refclock SHM 2:perm=666 filter 63
refclock SHM 1
I've tested chrony's PPS driver and I'm really shocked with its
synchronization quality. It is a HUGE improvement over ntpd. It was
hard to believe that it can sync clock with a precision of 1-2us but
it is true. However, my new kernel consumer seems to be able to keep the
same precision, but it c
On Mon, 8 Feb 2010, Miroslav Lichvar wrote:
On Mon, Feb 08, 2010 at 12:35:59PM +0100, Håkan Johansson wrote:
I've recently (for slightly other reasons) measured the in-kernel
time consumed by doing getnstimeofday() (several in a row), and for
most machines (2 GHz+) it took a whopping ~ 5
The attached patch changes the formatting of (nano)seconds such that very
large time offsets does not cause the lines of 'sources' or 'sourcestats'
to overflow. Root cause was the conversion from double to int that gave
misleading values, fooing the following logics. %f formatting in printf
Hi,
if I understand the discussion so far, there are two seemingly mutually
exclusive uses of the RTC:
a) Determining its actual rate, such that it can be used to set the system
time even after a long system shutdown. This requires (rather
accurate) knowledge of its drift.
b) Keeping
Two programs, serial_ntpshm and ieee1394_ntpshm, to send and receive time
stamps over a serial null-modem line or firewire bus are available at
http://fy.chalmers.se/~f96hajo/serial_ntpshm/serial_ntpshm_20110108.tar.gz
The serial transmission is with RTS/CTS and DTR/DTS, with the time of the
On Wed, 25 Apr 2012, Bill Unruh wrote:
On Wed, 25 Apr 2012, Ed W wrote:
On 24/04/2012 11:17, Miroslav Lichvar wrote:
On Tue, Apr 17, 2012 at 09:07:08AM -0700, Bill Unruh wrote:
> Mind you the rtc should not take 8 sec to read (it will take a couple,
> so
> perhaps most of that time is
On Sat, 9 Jun 2012, Bill Unruh wrote:
Is there some way of telling chrony to use certain sources not as candidates
for the selected sever but rather simply as references? Ie, chony queries ths
sources as usual, and goes through all the calculations, but then does not
use
it as a selected sour
Hi,
I would suggest what I think is called a nonce value.
- Server picks some random number/string and keeps that.
- Client sends a response, without nonce.
- Server takes the apparent client IP and the string and makes some hash
of that, the nonce value for that client IP.
- Server sends ver
On Fri, 17 Jan 2014, Bill Unruh wrote:
On Fri, 17 Jan 2014, Miroslav Lichvar wrote:
On Thu, Jan 16, 2014 at 07:50:33PM +0100, H???kan Johansson wrote:
I would suggest what I think is called a nonce value.
I think that's what ntpd uses with the new mrulist command. The
advantage over the s
On Fri, 17 Jan 2014, Miroslav Lichvar wrote:
On Fri, Jan 17, 2014 at 06:15:16PM +0100, Håkan Johansson wrote:
With the information collection problem for an attacker above, it is
probably so that also a much cheaper pseudo-random number generator
could be used instead of MD5. Say that one
With a logical or, the fclose will not happen if fprintf fails.
Perhaps better separate these calls?
// Håkan
On Tue, 21 Jan 2014, Harald Krammer wrote:
Hello,
I am testing Chrony 1.29 on my ARM based System with GCC 3.4.6.
A small problem is happen in reference.c. GCC 3.4.6 does not resp
t_file);
LOG(LOGS_WARN, LOGF_Reference, "Could not write to temporary
driftfile %s.tmp",
drift_file);
return;
}
+ fclose(out);
+
/* Clone the file attributes from the existing file if there is one. */
if (!stat(drift_file,&buf)) {
On Tue, 21 Jan 2014 10:39:4
any allocation in
chrony-1.30.tar.gz. Could you verify that you have seen the errors with
that clean source, and also send the valgrind output?
Thanks,
Håkan Johansson
On Tue, 5 Aug 2014, Miroslav Lichvar wrote:
On Wed, Jul 30, 2014 at 10:53:42AM +0200, Miroslav Lichvar wrote:
On Wed, Jul
Curiosity: recvfrom and sendto returns ssize_t (which is 64 bits on some
platforms), so this would invite for code that could make mistakes, by
cutting the values.
Should the return value not rather be put in a ssize_t or some other
variable that is large enough? And if really casted down,
On Sun, 9 Aug 2015, Bryan Christianson wrote:
On 9/08/2015, at 5:57 pm, Håkan Johansson wrote:
Curiosity: recvfrom and sendto returns ssize_t (which is 64 bits on some
platforms), so this would invite for code that could make mistakes, by cutting
the values.
Should the return value not
On Sat, 22 Oct 2016, Rune Magnussen wrote:
På Fri, 21 Oct 2016 16:11:16 -0700 (PDT)
Bill Unruh skrev:
On Sat, 22 Oct 2016, Rune Magnussen wrote:
Hi
When trying to install chrony from source, I found out that the
README refered to INSTALL which does not exist. Also asciidoctor is
needed dur
Perhaps it could be explained why they are obsolote,
each contributed item?
Best regards,
Håkan
On Thu, 15 Aug 2019, Vincent Blut wrote:
Hello,
I hope that this proposal will not cause controversy, but I really think that
apart from Bryan’s work, all the provided scripts should be erased d
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