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Re: [Xen-users] Help: Guest OS time synchronization problem
| To: | "Chu, Sam" <sam.chu@xxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-users] Help: Guest OS time synchronization problem |
| From: | Nico Kadel-Garcia <nkadel@xxxxxxxxx> |
| Date: | Mon, 11 Dec 2006 14:50:58 +0000 |
| Cc: | xen-users@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Mon, 11 Dec 2006 06:51:03 -0800 |
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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. _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users |
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