[RFC PATCH 0/3] nvme sq associations

[Keith Busch]

On Wed, Sep 29, 2021 at 12:48:49AM +0000, Nikitin, Andrey wrote:
> On 9/25/21, 01:38, "Christoph Hellwig" <hch at infradead.org> wrote:
> >
> > 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.