[PATCH] nvme: uring_cmd specific request_queue for SGLs

[Christoph Hellwig]

On Fri, Jun 27, 2025 at 09:34:56AM -0600, Keith Busch wrote:
> Back to this patch, I get that this uring_cmd path wouldn't be able to
> use the more efficient coalesced mapping when the IOMMU is on, and
> instead map each segment indiviually. I think that's still better than
> the alternative, though.

My back on the envelope calculations (for 8 byte metadata chunks)
suggests otherwise, but I never got around fully benchmarking it.
If you do have a representation workload that you care about I'd love to
see the numbers.