On Sat, Jun 17, 2017 at 09:11:30AM -0600, Jens Axboe wrote: > I have two samples here, and I just tested, and both of them want it > assigned with nsid=0xffffffff or they will fail the writes... So I'd say > we're better off ensuring we do allocate them globally.
That's clearly against the spec. I'd say go to your vendor and get a refund, as we Linux folks (Martin and I) fought for this so that we would not have to do the explicit allocations. Another quote for from the spec: "Streams are opened by the controller when the host issues a write command that specifies a stream identifier that is not currently open. While a stream is open the controller maintains context for that stream (e.g., buffers for associated data). The host may determine the streams that are open using the Get Status operation." And I think this is very important - otherwise you need to either allocate the stremas beforehand as your earlier patches (and we take away the resources from the 99% of the users not using write life hints), or we need the lazy allocation scheme. And for that to be efficient it probably needs to be lazy per-stream allocation. That's why we got the implicit open in after all.
