> On Fri, Jun 19, 2020 at 11:08:26AM -0700, Heiner Litz wrote: > > Hi Matias, > > no, I am rather saying that the Linux kernel has a deficit or at least > > is not a good fit for ZNS because it cannot enforce in-order delivery. > > FYI, the nvme protocol can't even enforce in-order delivery, so calling > out linux for this is a moot point. How does it work in SPDK then? I had understood that SPDK supported QD>1 for ZNS devices. I am not saying that Linux is the only problem. The fact remains that out of order delivery is not a good fit for an interface that requires sequential writes. > > > The requirement of sequential writes basically imposes this > > requirement. Append essentially a Linux specific fix on the ZNS level > > and that enforcing ordering would be a cleaner way to enable QD>1.
