RE: [Xen-devel] HPET in HVM guests

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

Keir, would you consider backing out 20709?  I don't think
Jan has confirmed a need to change the default, just a
question as to why the default was set as it was.

Given Dave Winchell's error measurements here:
http://lists.xensource.com/archives/html/xen-devel/2008-06/msg00181.html
and the long discussion that followed (which I don't
think was ever resolved or had patches applied) and
given that we don't have bug reports for the current
default, I think it would be a bad idea to change the
default, certainly without specific testing on Windows
and 2.6.9-based Linux kernels to see if the problems
Dave reported recur.

> -----Original Message-----
> From: Jan Beulich [mailto:JBeulich@xxxxxxxxxx]
> Sent: Monday, December 21, 2009 9:07 AM
> To: Dan Magenheimer
> Cc: Keir Fraser; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] HPET in HVM guests
> 
> 
> >>> Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> 21.12.09 16:51 >>>
> >Do the WHQL rules allow for turning on a parameter
> >in the VM config file?
> 
> I have no idea.
> 
> >If so, setting hpet=1 should
> >work (though I haven't tested it in quite awhile so
> >bitrot might have set in).
> 
> Setting hpet=1 in the VM config addresses this - that's why 
> the question
> really just was about the default the tools use in the 
> absence of a hpet=
> setting.
> 
> Jan
> 
>

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