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Date: Wed, 9 Sep 2009 19:09:06 +0300
From: Gleb Natapov <gleb@redhat.com>
Subject: Re: [Qemu-devel] Re: [PATCH] re-set rtc date on reset handler
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To: Anthony Liguori <aliguori@us.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>, Glauber Costa <glommer@redhat.com>, "dlaor@redhat.com" <dlaor@redhat.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Blue Swirl <blauwirbel@gmail.com>, Avi Kivity <avi@redhat.com>

On Wed, Sep 09, 2009 at 10:34:54AM -0500, Anthony Liguori wrote:
> Avi Kivity wrote:
> >On 09/09/2009 04:31 PM, Jan Kiszka wrote:
> >>'drift-compensation-for-windows-guests' - this is at least what the
> >>documentation suggests right now. I was looking for a short tag (but not
> >>as short as 'td'...).
> >>
> >
> >It would work for any guest that uses rtc as its main clock source.
> 
> First step is qdev conversion for the RTC.  You can then introduce a
> drift property.  I'd suggest something like
> drift=none|catchup|gradual.  The default can be none.  We can also
> introduce a kvm machine type where the default is catchup.
> Obviously, we don't support gradual today.
> 
What is "catchup" and what is "gradual"?

--
			Gleb.