On 24/01/14 17:42, William Unruh wrote:
Does it use the time from that one, or some sort of "average"? Since the
queries of the different servers occur at different times (separated by
about and hour, given the initial filter at poll 10) how does it take the
averagei
if it uses the average?
If there is a prefer peer and it survives, it uses that one, otherwise
as per clock_combine in ntp_proto.c, i.e. weighted by synchronisation
distance (which grows with time).
8,000 seconds is more like two hours. If that poll interval is being
used, it is assumed that time errors don't vary much over period
several times that.
The weighting may change between versions. This is 4.2.7p333.
y = z = 0;
for (i = 0; i < npeers; i++) {
x = 1. / peers[i].synch;
y += x;
z += x * peers[i].peer->offset;
}
sys_offset = z / y;
Jitter code removed.
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