john stultz wrote:
> On Wed, 2006-10-18 at 17:46 -0400, Lee Revell wrote:
>> [added John Stultz to cc]
>>
>> On Wed, 2006-10-18 at 15:57 -0400, [email protected] wrote:
>>> On Wed, 18 Oct 2006 18:44:59 +0200, Udo van den Heuvel said:
>>>> It is stuff that is visible by watching ntpq -pn output, by letting mrtg
>>>> graph stuff, etc. Watch the offset and jitter collumns.
>>>> Check /usr/sbin/ntpdc -c kerninfo output. Graph that stuff.
>>> So... you've presumably done that while identifying there is an issue.
>>> Please share the results. Have you tried booting back into a 2.6.17
>>> or so and seen offset/jitter improve? etc etc etc.
>
> Udo:
> Are you running the linuxpps patches, or is this vanilla 2.6.18 without
> any additional patches? Mind sending your dmesg and some "ntpdc -c
> kerninfo" output? Any of those graphs you mention above would be great
> as well.
I am running the latest LinuxPPS patch from Rodolfo Giometti.
# /usr/sbin/ntpdc -c kerninfo
pll offset: -0.002536 s
pll frequency: 20.610 ppm
maximum error: 0.007567 s
estimated error: 0.00046 s
status: 0001 pll
pll time constant: 2
precision: 1e-06 s
frequency tolerance: 512 ppm
# ntpq -pn
remote refid st t when poll reach delay offset
jitter
==============================================================================
127.127.1.0 .LOCL. 10 l 7 64 377 0.000 0.000
0.002
*127.127.20.0 .GPS. 0 l 1 16 377 0.000 -0.268
0.102
-194.109.22.18 193.79.237.14 2 u 257 512 377 5.511 0.951
1.444
+193.67.79.202 .GPS. 1 u 250 512 377 16.862 0.398
4.701
+193.79.237.14 .GPS. 1 u 251 512 377 13.306 -0.001
[cut]
I don't have a dmesg for 2.6.18.1 on this machine (did not save it).
Will do when there is a next reboot of this VIA CL6000E board.
When the machine was idle offset and jitter would be in the 0.00X range.
Now it is more in the 0.XXX range or worse.
Performance for these figures has at least deteriorated a factor of
about 10.
The mrtg graphs are of no use since in the month graph the 'good' part
just moved off the screen and in the year graph the resolution is too
low. :-(
Udo
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