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Date: Wed, 28 Aug 2013 09:50:20 +0200
From: Stefan Hajnoczi <stefanha@gmail.com>
Message-ID: <20130828075020.GA4696@stefanha-thinkpad.muc.redhat.com>
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Subject: Re: [Qemu-devel] Boot Problems Windows XP guest
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Erik Rull <erik.rull@rdsoftware.de>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

On Tue, Aug 27, 2013 at 11:31:28PM +0200, Paolo Bonzini wrote:
> Il 27/08/2013 22:26, Erik Rull ha scritto:
> > It's more a guess, there must be a
> > change between 1.2.0 and 1.6.0 that prevents a simple Windows XP from
> > booting completely, if the guest HDD image is placed on a SSD. On a
> > rotating HDD (with the same commandline except the path to the image) it
> > boots successfully. The only difference is the speed of the disk access.
> 
> It could be a real difference, actually.  An unexpectedly fast disk
> might screw a sloppy driver.  IIRC you're not the first person reporting
> it.  Stefan, do you think using block throttling could fix it (with some
> trial and error)?

That might work.  You could start with something like -drive ...,iops=20
and then disable the limit from the QEMU monitor once the guest OS is
booting (block_set_io_throttle virtio0 0 0 0 0 0 0).

It would be easier to try -drive ...,cache=writethrough and -win2k-hack
first as Anthony suggests.

Stefan