From: Keith Busch
Date: Thu Mar 21 2019 - 12:20:45 EST

On Thu, Mar 21, 2019 at 04:12:39PM +0000, Stefan Hajnoczi wrote:
> mdev-nvme seems like a duplication of SPDK. The performance is not
> better and the features are more limited, so why focus on this approach?
> One argument might be that the kernel NVMe subsystem wants to offer this
> functionality and loading the kernel module is more convenient than
> managing SPDK to some users.
> Thoughts?

Doesn't SPDK bind a controller to a single process? mdev binds to
namespaces (or their partitions), so you could have many mdev's assigned
to many VMs accessing a single controller.