Re: CentOs 5.6 and Time Sync

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On 4/13/2011 7:35 AM, Mailing List wrote:
> Hi,
>
>   I have upgraded my Dell C151 to the latest 5.6. I have always used
> ntp to sync this machine and then the rest of the machines in the
> network would sync from it. Since the update I cannot keep the right
> time on the machine. This is with / without ntp. I have attempted
> various scenario's with no luck. I am now trying the old kernel now as
> I type this out. If anyone else has any links or ideas that I should
> check out It would be greatly appreciated.
>
>      Just a quick note about my setup. I do not use any gui. As
> mentioned I have not had any issues with this machine and it's time
> until I upgrade.
>
> AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
> 3gb of ram.
>
> TIA.
>
> Brian.
>

    Something I wanted to add, Cal here on the list gave me a command to 
run.. Here is the results on a working 5.5 kernel.

root > ~# ntpq -c pe -c as
       remote           refid      st t when poll reach   delay   offset 
  jitter
==============================================================================
*slackadelic.com 204.9.54.119     2 u  746 1024  377   57.333   -1.560 
  1.054
+ntp2.Rescomp.Be 128.32.206.55    2 u  351 1024  377  107.342   11.677 
  0.197
+w1-wdc.ipv4.got 10.0.77.54       3 u  708 1024  377   25.122    8.503 
  1.698
   LOCAL(0)        .LOCL.          10 l   33   64  377    0.000    0.000 
   0.001

ind assID status  conf reach auth condition  last_event cnt
===========================================================
    1 18756  9614   yes   yes  none  sys.peer   reachable  1
    2 18757  9414   yes   yes  none  candidat   reachable  1
    3 18758  9414   yes   yes  none  candidat   reachable  1
    4 18759  9014   yes   yes  none    reject   reachable  1


   Now here is the results on the 5.6 kernels.

root > ~# ntpq -c pe -c as

       remote           refid      st t when poll reach   delay   offset 
  jitter
============================================================================== 

   bindcat.fhsu.ed 132.163.4.101    2 u 1015 1024  377   49.987  -15082. 
6919.88
   216.45.57.38    108.71.253.18    2 u  998 1024  377   83.112  -15139. 
6900.14
   javanese.kjsl.c 69.36.224.15     2 u    1 1024  377  109.083  -29233. 
7285.83
*LOCAL(0)        .LOCL.          10 l   13   64  377    0.000    0.000 
  0.001

ind assID status  conf reach auth condition  last_event cnt
===========================================================
    1 26525  9044   yes   yes  none    reject   reachable  4
    2 26526  9044   yes   yes  none    reject   reachable  4
    3 26527  9044   yes   yes  none    reject   reachable  4
    4 26528  9644   yes   yes  none  sys.peer   reachable  4


And as for the clock source.

# CentOS 5.5 Kernel 2.6.18-194.32.1.el5.. Time runs as it should.
cat 
/sys/devices/system/clocksource/clocksource0/available_clocksource=jiffies

cat /sys/devices/system/clocksource/clocksource0/current_clocksource=jiffies

# CentOS 5.6 kernel 2.6.18-238.5.1.el5 Time goes to the dogs.
cat 
/sys/devices/system/clocksource/clocksource0/available_clocksource=jiffies

cat /sys/devices/system/clocksource/clocksource0/current_clocksource=jiffies
TIA
Brian

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