Re: [Xen-devel] Re: Fix for get_s_time()

[Dave Winchell <dwinchell@xxxxxxxxxxxxxxx>]

Keir Fraser wrote:

> On 24/4/08 17:04, "Dave Winchell" <dwinchell@xxxxxxxxxxxxxxx> wrote:
>
>  
>
> > yes, this is the issue. What you suggest should be fine and I am trying
> > it now.
> > With the locking version (and a fix to a bug I introduced) I got .0012%
> > error
> > on an overnight run with hpet layered on get_s_time_mono(), which is the
> > max(prev, cur) layer on get_s_time we discussed.
> >    
> 12 parts per million is pretty good. Is that cumulative deviation from 'wall
> time' over ~12 hours?
yes, deviation between the guest's time and an ntp reference.

> That could easily be explained by the fact that Xen
> system time is not sync'ed with ntp.
>  
That's true. And, as we have discussed, this error seems to vary quite a bit
platform to platform for some reason. I will verify that this still is 
the case.
-Dave

> -- Keir
>
>
>  

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