Re: [Xen-ia64-devel] SMP-guest status

[Alex Williamson <alex.williamson@xxxxxx>]

On Wed, 2006-04-19 at 11:38 +0200, Tristan Gingold wrote:
> +       /* Fill a platform feature.  ITC are (almost!) synchronized. .
> */
> +       sal_feature->type = SAL_DESC_PLATFORM_FEATURE;
> +       sal_feature->feature_mask =
> IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;

   Is the jitter protection in the time interpolator sufficient for
ignoring this?  Drift is really meant to indicate the ITCs are driven
from different time sources so may run at slightly different clock
frequencies.  Seems we should only need to provide that flag to the
guest if the platform firmware set it.  As long as the ITCs are nearly
synchronized, the jitter protection in the ITC interpolator will prevent
time from going backwards.  This would then get rid of the change in
time.c.  Thanks,

        Alex

-- 
Alex Williamson                             HP Linux & Open Source Lab


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