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

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

Hi,

using SLES10 I'm unable to synchronize the time of DomU with that of Dom0. 
There 
is a persistent offset of about 3 seconds!

Here's a small history (not actual output):
     remote           refid      st t when poll reach   delay   offset  jitter
 rkdvmso1.dvm.kl 192.168.0.11     5 u    -   64    1    0.136  -2977.1   0.099
*rkdvmso1.dvm.kl 192.168.0.11     5 u    2   64    3    0.092  -2980.9   1.245
*rkdvmso1.dvm.kl 192.168.0.11     5 u    1   64    7    0.073  -2986.6   0.274
*rkdvmso1.dvm.kl 192.168.0.11     5 u    8   64   37    0.107  -2992.4   0.271
*rkdvmso1.dvm.kl 192.168.0.11     5 u   39   64  177    0.064  -2998.4   0.341
*rkdvmso1.dvm.kl 192.168.0.11     5 u    9   64  377    0.108  -3001.4   0.415
*rkdvmso1.dvm.kl 192.168.0.11     5 u    -   64   77    0.104  -3036.6   1.050
 rkdvmso1.dvm.kl 192.168.0.11     5 u    -   64    1    0.133  -3039.7   0.001
*rkdvmso1.dvm.kl 192.168.0.11     5 u   10   64    1    0.080  -3043.2   0.858
*rkdvmso1.dvm.kl 192.168.0.11     5 u   24   64   17    0.067  -3052.3   0.236
*rkdvmso1.dvm.kl 192.168.0.11     5 u    1   64   37    0.067  -3052.3   2.093
*rkdvmso1.dvm.kl 192.168.0.11     5 u    6   64  177    0.096  -3061.2   0.230

Dom0 is properly synchronized however:
+pctick1a.dvm.kl 132.199.176.153  4 u  358  512  377    0.257   -1.471   0.752
*rkdvmhp2.dvm.kl 192.168.0.16     4 u  317  512  377    0.266    0.635   0.057

Can anybody explain, while the clock sticks at a 3 second offset for DomU?
/var/log/ntp says things ike these:
11 Oct 10:08:27 ntpd[12453]: synchronized to 192.168.0.61, stratum 5
11 Oct 10:08:27 ntpd[12453]: time reset -2.977411 s
11 Oct 10:09:39 ntpd[12453]: synchronized to 192.168.0.61, stratum 5
11 Oct 10:23:29 ntpd[12453]: time reset -3.018544 s
11 Oct 10:31:23 ntpd[12625]: synchronized to 192.168.0.61, stratum 5
11 Oct 10:31:23 ntpd[12625]: time reset -3.040169 s

Regards,
Ulrich


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