On Wed, Jul 05, 2017 at 10:14:23AM +0200, Thomas Huth wrote: > Hi, > > On 05.07.2017 08:57, Chao Peng wrote: > > > > Q35 has been in QEMU for quite a while. Compared to the current default > > i440FX, Q35 is probably not that mature and not widely used, however in > > some case, Q35 has advantages, for example, in supporting new features. > > For instance, we have some features require PCI-e support which is only > > available on Q35 and some others need it for EFI support. It is of > > course not necessary to change it as the default but if more and more > > features have dependencies on Q35 because of requiring much more modern > > features then I think it may be worth to do so. In such case we can have > > more people to use it and find problems we may know or not know. > > Yes, IMHO at one point in time, we should switch the default machine > type to q35. The i440FX is really quite old... > > > There are certainly some drawbacks: > > - Compatibility: current code or script may need adjustment > > That might be a real concern ... so I think a good point in time to > switch to the q35 machine type would be when we switch to the next major > version number of QEMU, i.e. when we switch to version 3.0. If the users > see a new major version number, they might be more willing to accept > such major changes (yeah, I know, we've discussed in the past that > version numbers are just numbers ... but still, there is some kind of > psychological aspect to this, too, I think)
Most users aren't even aware of version numbers of QEMU - they'll just take whatever their distro has provided run it. The notion that their latest distro version happened to pull in a "major" version instead of previously pulling in a "minor" version is invisible to everyone, except the minority of people who care about the low level details. Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
