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

[Paolo Bonzini <pbonzini@redhat.com>]

Il 27/08/2013 23:37, Anthony Liguori ha scritto:
> On Aug 27, 2013 4:32 PM, "Paolo Bonzini" <pbonzini@redhat.com
> <mailto:pbonzini@redhat.com>> wrote:
>>
>> Il 27/08/2013 22:26, Erik Rull ha scritto:
>> > Hi Stefan,
>> >
>> > which BIOS is selected by default?
>>
>> QEMU only ships with SeaBIOS.
>>
>> > 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)?
> 
> Add cache=writethrough and I bet it'll work even on an SSD.

You'll also kill the SSD rather quickly though. :)

Paolo

> We changed the default in that timeframe.  The Windows IDE drivers can
> have an issue if the IRQ comes too quickly to indicate the request has
> completed.  This is what -win2k-hack is for.  That may also work here too.