https://bugzilla.novell.com/show_bug.cgi?id=745603
https://bugzilla.novell.com/show_bug.cgi?id=745603#c1
Charles Arnold changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
InfoProvider| |wolfgang@rosenauer.org
--- Comment #1 from Charles Arnold 2012-02-13 17:23:41 UTC ---
For fully virtualized guests, each one needs to point
at a common NTP server in order to stay in sync. Para-virtualized guests
get their time from dom0 unless someone has set
/proc/sys/xen/independent_wallclock within the guest.
If the fully virtualized guests still have a problem even pointing at
an NTP server, then trying the following may solve the problem.
1. Edit the guests menu.lst file and on the kernel line add:
notsc divider=10
Reboot the guest after making the change.
2. The openSUSE 11.4 dom0 uses Xen 4.0.x which has a new guest configuration
file option called tsc_mode. This can be used on a per domain basis
and allows for the following values.
The non-default choices for tsc_mode are:
- tsc_mode=1 (always emulate). All rdtsc instructions are emulated;
- tsc_mode=2 (never emulate). This is the same as prior to Xen 4.0.
- tsc_mode=3 (PVRDTSCP). High-TSC-frequency apps may be paravirtualized
(modified) to obtain both correctness and highest performance.
If tsc_mode is left unspecified (or set to tsc_mode=0), a hybrid
algorithm is utilized to ensure correctness while providing the
best performance possible.
Please report your results.
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