[kata-dev] [Announce] virtio-fs released with Kata Containers support

Stefan Hajnoczi stefanha at redhat.com
Mon Dec 17 14:27:39 UTC 2018

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?

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