latency spikes, was Re: [LinuxPPS] slightly offtopic

[Udo van den Heuvel]

Udo van den Heuvel wrote:
> Udo van den Heuvel wrote:
>> Some largish (for this box) downloads.
>> I then expect the box to keep pps as the main time source since the rest
>> is 'far' away over the net.
>> So how can it be that although there is NMEA stuff can still drift to
>> another host as primary time source?
> 
> Now the box is more or less idle and I see this:

Did somethign change in the kernel. I am runnign 2.6.18 since a few
days. It looks like the PPS edge (200 ms in length) is part of this game
now.
flag2 doesn't matter, though, as a few short tests show.

so now I have:

server 127.127.20.0 prefer minpoll 4
fudge 127.127.20.0 flag3 1 flag2 0 time1 0.200

and I see:

     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 127.127.1.0     .LOCL.          10 l   59   64    3    0.000    0.000
 0.002
*127.127.20.0    .GPS.            0 l    5   16  377    0.000    1.445
 1.746
 194.109.22.18   131.188.3.220    2 u   26   64    3    8.067   -8.445
 2.374
 193.67.79.202   .GPS.            1 u   25   64    3   17.958   -7.631
 6.096
 193.79.237.14   .GPS.            1 u    5   64    7   14.665   -6.791
 4.260