Re: [LSF/MM TOPIC] multiqueue and interrupt assignment

[Hannes Reinecke <hare@suse.de>]

On 02/03/2016 02:32 PM, Sagi Grimberg wrote:
> 
>> Indeed, something like this.
>> Quite some issues would be solved if we could push a hctx mapping
>> into blk-mq, instead of having it assign its own made-up one.
> 
> For that you can provide your own .map_queue in blk_mq_ops I think
> (no one does that at the moment). This requires every driver to
> implement it's own routine (probably with a similar logic) though...

And at the same time direct interrupt assigment from the driver is
frowned upon ... feels a bit stupid, having to setup a cpu-to-queue
assigment (which typically is identical to the cpu-to-msix
assignment), then pass this information to blk-mq, which then passed
it to user-space, which then uses the information to setup a
cpu-to-msix assignment.
There is room for improvement there ...

Are there any plans addressing this in blk-mq?
What does NVMe and virtio do?

Cheers,

Hannes
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Dr. Hannes Reinecke		   Teamlead Storage & Networking
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