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Stefan -

No, there isn’t a live migration requirement for Kata (sorry for the top post). 

Eric

> On Dec 17, 2018, at 6:27 AM, Stefan Hajnoczi <stefanha at redhat.com> wrote:
> 
>> On Sun, Dec 16, 2018 at 09:09:48AM +0800, Qixuan Wu wrote:
>> 1) Did you compare the performance to the virtio-blk raw or qcow2 solution
>> of normal virtual machine?
> 
> Not yet.
> 
> Guest and host page cache performance can dominate benchmarks, so we
> typically use fio direct=1 with QEMU -drive cache=none (O_DIRECT) to
> focus purely on disk I/O performance and not page cache.  The same thing
> can be done with virtio-fs so that every I/O operation requires
> communication with the host.  In theory virtio-fs should be comparable
> to virtio-blk on raw.
> 
> In real-world scenarios the page cache will be enabled, especially for
> the virtio-fs DAX feature.  So I need to think carefully about what to
> benchmark, but it will probably include both configurations.
> 
>> 2) Whether does it impact live-migration of guest os ?
> 
> Virtio-fs currently does not support live migration.  Is there a
> requirement for live migration with Kata Containers use cases?
> 
> Stefan