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Re: [Xen-devel] HPET in HVM guests

To: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Subject: Re: [Xen-devel] HPET in HVM guests
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Mon, 21 Dec 2009 16:50:33 +0000
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>
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 -- Keir

On 21/12/2009 16:34, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:

> 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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