Re: [Xen-users] Help: Guest OS time synchronization problem

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Chu, Sam wrote:
> I am having great difficulty to maintain guest OS time. Here is my 
> environment.
> Hardware: Intel Woodcrest processor.
>
> Xen: 3.0.3
>
> Xen OS: Red Hat Enterprise 4 Update 3, x86_64 version
>
> Guest OS: configuration is pretty standard. Please see the end of email.
>
> Guest OS: Red Hat Enterprise 4 Update 3, x86_64, with everything 
> installed, ntpd not running.
> /proc/sys/xen/independent_wallclock = 0
>
> /proc/sys/xen/permitted_clock_jitter = 10000000
>
>  
NTP should run out of Dom0: that seems to correctly set NTP for all DomU's.

Do not run independent, local hardware clocks, if you can reasonably 
avoid it. Seriously: I'm afraid the kind of time drift you're seeing is 
typical for overclocked, overheated, low quality motherboards with clock 
chips purchased at an "OEM discount" from the back of somebody's bicycle 
in Taiwan. Unfortunately, I've seen too much of that kind of hardware in 
use for Beowulf clusters.

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