Re: [Qemu-devel] Boot Problems Windows XP guest

[Stefan Hajnoczi]

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