On Wed, Sep 29, 2021 at 12:48:49AM +0000, Nikitin, Andrey wrote:

On 9/25/21, 01:38, "Christoph Hellwig" [off-list ref] wrote:

quoted

Honestly I'd rather not merge this whole patchset at all.  It is a
completly frinde feature for a totally misdesigned part of the NVMe
spec.  Until actual controller in the hands of prosumers support
anything like that I'm very reluctant to bloat the driver fast path for
it.

Thank you for the feedback.
While I agree with your remarks regarding feature design in NVMe spec
the minimal implementation proposed in this patchset would help resolving
the problems outlined int the original post (undesired queue sharing and
noisy neighbor).

You still get noisy neighbor with this approach, though: completions
from one set can stall the driver from reaping another set's completions
that were posted earlier.

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