Re: [Xen-users] Time diferrence between dom0 and domU

[Matthieu Patou <mat+Informatique.xen@xxxxxxxxx>]

Hello Jordi,
I noticed the same problem and that's pretty nasty on HVM host running 
windows as the system can't login on domain by defaut due to too big 
time drift.
I worked around by adding ~ 6 minutes to the time of the domU at startup.

On 05/11/2009 11:21, Jordi Espasa Clofent wrote:
> Hi all,
>
> In dom0:
>
> xen01ad:/# ls -l /etc/localtime
> lrwxrwxrwx 1 root root 33 2009-07-02 10:51 /etc/localtime ->
> /usr/share/zoneinfo/Europe/Madrid
> xen01ad:/# ntpdate hora.rediris.es
> 3 Nov 18:49:46 ntpdate[9558]: adjust time server 130.206.3.166 offset
> 0.163783 sec
>
> In domU:
>
> xen-ad0006:~# date
> Tue Nov 3 18:55:29 CET 2009
> xen-ad0006:~# ls -l /etc/localtime
> lrwxrwxrwx 1 root root 33 Nov 3 13:24 /etc/localtime ->
> /usr/share/zoneinfo/Europe/Madrid
> xen-ad0006:~# ntpdate hora.rediris.es
> 3 Nov 18:55:44 ntpdate[19800]: step time server 130.206.3.166 offset
> -294.467004 sec
>
> As you can see, the time difference between dom0 and domU is aprox 6 min.
> ¿why?
>
> It's supposed that domUs has the dom0's time.
>
> Info:
>
> * I don't use the independent_wallclock
> * xen01ad:/# uname -a && xm info
> Linux xen01ad 2.6.18-6-xen-amd64 #1 SMP Tue May 5 09:56:33 UTC 2009
> x86_64 GNU/Linux
> host : xen01ad
> release : 2.6.18-6-xen-amd64
> version : #1 SMP Tue May 5 09:56:33 UTC 2009
> machine : x86_64
> nr_cpus : 8
> nr_nodes : 1
> cores_per_socket : 4
> threads_per_core : 1
> cpu_mhz : 2110
> hw_caps :
> 178bf3ff:efd3fbff:00000000:00000110:00802001:00000000:000037ff
> total_memory : 16383
> free_memory : 4161
> node_to_cpu : node0:0-7
> xen_major : 3
> xen_minor : 2
> xen_extra : -1
> xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
> hvm-3.0-x86_32p hvm-3.0-x86_64
> xen_scheduler : credit
> xen_pagesize : 4096
> platform_params : virt_start=0xffff800000000000
> xen_changeset : unavailable
> cc_compiler : gcc version 4.3.1 (Debian 4.3.1-2)
> cc_compile_by : waldi
> cc_compile_domain : debian.org
> cc_compile_date : Sat Jun 28 09:32:18 UTC 2008
> xend_config_format : 4

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