Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it

[Anthony Liguori]

Paolo Bonzini <address@hidden> writes:

>> But libguest can set it's accelerator option to whatever it wants.
>> 
>> If your running QEMU under a VM, it's pretty reasonable to have to
>> use a special option IMHO.
>
> It's also reasonable to have consecutive releases change defaults in
> a more "friendly" way (i.e. from tcg to kvm:tcg), especially since
> we'll get users that formerly used qemu-kvm and never had to specify
> neither -machine accel nor --enable-kvm.

I agree with you except for the 'kvm:tcg' part.

>
>> > IMHO, default to KVM, fallback to TCG is the most friendly default
>> > behaviour.
>> 
>> Except if a user expects good network performance and can't
>> understand why they're getting 100kb/s.
>
> libguestfs doesn't need network at all (though I wonder if they could
> use lxc instead...).

FWIW, libguestfs already uses -machine accel=kvm:tcg so we can
completely the libguestfs use-case for this discussion.

Regards,

Anthony Liguori

>
> Paolo