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Re: [Qemu-devel] WinXp Guest clock drift

From: Magnus Damm
Subject: Re: [Qemu-devel] WinXp Guest clock drift
Date: Tue, 22 Mar 2005 09:28:33 +0100

On Tue, 22 Mar 2005 12:21:47 +0400, Brad Campbell <address@hidden> wrote:
> Magnus Damm wrote:
> > On Mon, 21 Mar 2005 23:15:24 -0800, Mike Swanson
> > <address@hidden> wrote:
> >
> >>Well, this is probably a nuisance in all emulators :p
> >
> >
> > Does it have to be that way? I mean - if a media player can keep track
> > of the time of a movie (with and without sound) then wouldn't it be
> > possible for other applications like emulators to keep accurate time?
> >
> > I do not know how the time is handled in QEMU, but I wrote code some
> > years ago that monitored itself with gettimeofday() and adjusted the
> > drift on the fly.
> I actually find all sorts of oddities with timing and qemu emulation. 
> Sometimes when installing
> stuff in a windows guest the guest slows to a crawl until I move the mouse 
> around or drag a window
> or something similar. Almost like it starts to go to sleep until it gets some 
> user interaction.

I second that observation.

> There are a number of emulation oddities thus far, I just get used to them 
> and work around them. I
> guess I should actually have a go at debugging them really.

The same goes for me...

/ magnus

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