Xen block backend/frontend multiqueue support

Xen block backend/frontend multiqueue support

[haofeng hua]

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Hi all, there are some questions about Xen block backend/frontend
multiqueue support.
In linux, block multiqueue API is used to allocate per CPU a block thread
to handle the block request.
In a system on xen hypervisor, the request from PV guest is put into the
shared ring and passed to the driver domain.
So how to use multiqueue API in frontend driver and backend driver
 respectively?
What I think is using multiqueue API in backend driver to dispatch requests
from shared ring, does that work? What about the frontend driver?

Best regards.

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Re: Xen block backend/frontend multiqueue support

[Konrad Rzeszutek Wilk]

On Wed, Mar 19, 2014 at 08:00:00PM +0800, haofeng hua wrote:
> Hi all, there are some questions about Xen block backend/frontend
> multiqueue support.
> In linux, block multiqueue API is used to allocate per CPU a block thread
> to handle the block request.
> In a system on xen hypervisor, the request from PV guest is put into the
> shared ring and passed to the driver domain.
> So how to use multiqueue API in frontend driver and backend driver
>  respectively?

You would have to have more rings.

> What I think is using multiqueue API in backend driver to dispatch requests
> from shared ring, does that work? What about the frontend driver?

Same thing I believe - the frontend would allocate X amount of rings - where
the X is based on the amount of CPUs.

The backend would then have to support X amount of rings with the frontend.

> 
> Best regards.