Re: [Xen-users] time synchronization problem (using NTP)

["Ulrich Windl" <ulrich.windl@xxxxxxxxxxxxxxxxxxxx>]

On 11 Oct 2006 at 19:02, Christoph Purrucker wrote:

> Hi Thomas,
> 
> > As far as my experience shows, none of the ntp / independent_wallclock 
> > combinations work. We got the same problem here with xen 3.0.2 and 
> > kernel 2.6.16. It looks like ntpd can't set the time in DomUs with 
> > independent_wallclock set to 1 but the DomUs aren't using the exact time 
> > of Dom0 with independent_wallclock set to 0.
> 
> I'm running 2.6.16-2-xen-k7 with XEN 3.0 on both Dom0 and DomUs. A cron 
> job on Dom0 runs "ntpdate ptbtime1.ptb.de" every night (shifting the 
> time some milliseconds). All DomUs are perfectly in sync. 
> /proc/sys/xen/independent_wallclock = 0 in all DomUs.
> 

A plain "ntpd" also does the job once XEN's own synchronization (wich must be 
buggy) is disabled (sysctl -w xen.independent_wallclock=1):

(2 DomUs):
rksapas01:~ # ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*rkdvmso1.dvm.kl 192.168.0.11     5 u   60  128  377    0.081    0.004   0.431

rksapas01:~ # ntpq -p rkdvmsod
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*rkdvmso1.dvm.kl 192.168.0.11     5 u  233  256  377    0.088    0.038   0.010
+rkdvmas01.dvm.k 192.168.0.61     6 u   10  256  377    0.117    0.033   0.248

(Dom0):
rksapas01:~ # ntpq -p rkdvmso1
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+pctick1a.dvm.kl 132.199.176.153  4 u  731 1024  377    0.164   -0.840   0.772
*rkdvmhp2.dvm.kl 192.168.0.16     4 u  712 1024  377    0.338    1.489   0.034

(All offsets are milliseconds, Configuration not complete yet)

Regards,
Ulrich


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