On Wed, Mar 16, 2022 at 04:50:53PM +0200, Sagi Grimberg wrote: >>> I know, and that was my original question, no one cares that this >>> interface completely lacks this capability? Maybe it is fine, but >>> it is not a trivial assumption given that this is designed to be more >>> than an interface to send admin/vs commands to the controller... >> >> Most people don't really care about or use multipath, so it's not a >> primary goal. > > This statement is generally correct. However what application would be > interested in speaking raw nvme to a device and gaining performance that > is even higher than the block layer (which is great to begin with)? If passthrough is faster than the block I/O path we're doing someting wrong. At best it should be the same performance. That being said multipathing is an integral part of the nvme driver architecture, and the /dev/ngX devices. If we want to support uring async commands on /dev/ngX it will have to support multipath.
