On Wed, Jun 17, 2015 at 8:42 AM, Michael S. Tsirkin <m...@redhat.com> wrote: > On Wed, Jun 17, 2015 at 12:16:09PM +0800, Jason Wang wrote: >> >> >> On 06/16/2015 04:16 PM, Thibaut Collet wrote: >> > For a live migration my understanding is there are a suspend resume >> > operation: >> > - The VM image is regularly copied from the old host to the new one >> > (modified pages due to VM operation can be copied several time) >> > - As soon as there are only few pages to copy the VM is suspended on >> > the old host, the last pages are copied, and the VM is resumed on the >> > new host. Migration is not totally transparent to guest that has a >> > small period of unavailability. >> >> But guest is not involved in the any of the migration process. Unless >> the performance drop, guest should not notice the migration at all. > > It is easy for backend to detect that guest started using the device, > e.g. detect DRIVER_OK status set. > I think that's enough to send RARPs. > >> Btw, please use bottom-posting which is easier for reader to understand >> the context. >> >> Thanks > > I agree, please don't top-post. > > -- > MST
Sorry for top-posting rather than bottom-posting. Regarding the use of DRIVER_OK, in your opinion, when is the best time to test it ?
