A C,
Before you take a hacksaw to code, you should see the How NTP Works
collection in the online documentation, in particular the clock select
algorithm page. It includes advice on how to avoid falsetickers in
cases like yours, including the use of tinker and/or tos commands. There
should be no need of additional trace lines in the code, as there
already are some that demonstrate the results of the clock select and
clluster algorithms.
D M
A C wrote:
On 4/4/2012 18:52, E-Mail Sent to this address will be added to the
BlackLists wrote:
Dave Hart wrote:
A C<agcarver+...@acarver.net> wrote:
Where in the code of 4.2.7p270 is the determination that
a peer is a falseticker? I'm looking through ntp_proto.c
but I don't think I'm fully grasping how the determination
is made and the peer marked.
I want to put some debug lines in the area of the code
where the falseticker is determined so I can figure out
what conditions are causing the PPS to be marked as a
false ticker.
Line 2519 of ntp_proto.c (in clock_select):
peer->new_status = CTL_PST_SEL_SANE;
All survivors to that point in the code get the x, fleetingly. Those
that keep it fail to survive to line 2688:
peers[i].peer->new_status = CTL_PST_SEL_SELCAND;
I would have thought 2835 - 2855 might be where he would
want to take a closer look.
Well that was a fun exercise. The end result is that the PPS is no
longer a false ticker and I don't need a prefer peer either. :)
Believe it or not, it's actually working better this way. For
starters, the offset is staying within +/- 10 us of the PPS pulse.
Additionally, allowing the system to select the rest of the clocks
using the normal clock selection instead of a prefer peer has actually
quieted the sys_fuzz messages. Usually I was seeing a sys_fuzz
message perhaps once every couple minutes. Now I see one maybe once
in a few hours or more. Plus if any of the peers explodes for
whatever reason it doesn't wipe out my clock because the averaged time
doesn't move much.
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