Re: [Qemu-devel] virtio-serial-pci very expensive during live migration

[Paolo Bonzini]

Il 09/05/2014 02:53, Chris Friesen ha scritto:
> Turns out I spoke too soon.  With the patch applied, it boots, but if I
> try to do a live migration both the source and destination crash.  This
> happens for both the master branch as well as the stable-1.4 branch.

The destination doesn't crash, it simply stops because it got an 
incomplete migration stream.  Thanks for the report, the patch seems 
correct so it's worthwhile looking at it more closely.

> If I back out the patch, it works fine.  If I leave the patch in and
> disable kvm acceleration it works fine.

Indeed, non-KVM doesn't use ioeventfd at all.

Paolo