[libvirt] [PATCH v2 2/2] qemu: Default to virtio-net where available

[Martin Kletzander]

On Thu, Sep 03, 2015 at 09:53:26AM +0100, Daniel P. Berrange wrote:
>On Thu, Sep 03, 2015 at 10:48:58AM +0200, Andrea Bolognani wrote:
>> On Wed, 2015-09-02 at 16:08 -0400, Laine Stump wrote:
>> > >    * change the default for all architectures (except arm)
>> > >      instead of just ppc64
>> >
>> > Are we certain we want to do this even for x86 guests? I don't think
>> > it's a good idea - it makes the default into something for which no
>> > driver exists on the install media for *many* x86 guests, meaning it
>> > is
>> > highly likely that a "default" config would have non-functional
>> > networking. AFAIR this is why we didn't make virtio the default
>> > several
>> > years ago when we began recording a default into the XML (and why the
>> > last time changing the default was discussed, I believe it was
>> > pointing
>> > more towards something like e1000, i.e. something which 1) we are
>> > certain has a driver on every guest OS installation media that might
>> > be
>> > found, 2) is better maintained in qemu than the rtl8139, and 3)
>> > performs
>> > better than rtl8139 (although obviously not as good as virtio).
>>
>> Good point. We could switch the default to virtio just for
>> ppc64 then, leaving the capability check in place of course,
>> and change the global default from rtl8139 to e1000 in a
>> separate series.
>
>I think we should just do nothing. If people/apps care about optimal
>defaults, nothing libvirt changes will make them happy. Apps need to
>be just using libosinfo to get the sensible defaults on a per OS
>basis.
>

OK, so maybe at least using virtio instead of rtl8139 only in case
rtl8139 is not available.

>Regards,
>Daniel
>--
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