Il 31/10/2012 14:58, Markus Armbruster ha scritto: > So by default, you can have only two fast devices, and you get them only > if you know that you need to use unit=4 and unit=5.
Or "-m q35". > Naive usage, including -hda, gets IDE compatibility mode, which is slower. > > I think this is robbing Peter to pay Paul. Everything is. > Peters getting robbed: > > * New guests that would deal just fine with q35 including AHCI lose: > they get "upgraded" to AHCI in IDE compatibility mode, which is slower > than the real thing. But also slower than virtio. :) > * Existing guests that could deal with the hardware upgrade from i440FX > to q35 just fine lose the same way. > > Pauls getting paid: > > * Existing guests that can deal with the upgrade *except* for AHCI > *continue to work. > > And there are Pats who still won't get paid: > > * Existing guests that can't deal with the chipset changing under them > still break. Do we know of any? > If we make q35 the default and q35 with compat IDE an option, then the > Peters just work, and the Pauls and the Pats break on upgrade until you > specify a machine type that works. Is there anything that prevents us from doing it later? Paolo
