Re: [Xen-devel] [PATCH RFC] xenbus_client: extend interface to suppurt multi-page ring

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, May 30, 2013 at 03:06:00PM +0100, Wei Liu wrote:
> Originally Xen PV drivers only use single-page ring to pass along
> information. This might limit the throughput between frontend and
> backend as they can easily run out of ring slots if hardware is fast.
> 
> The patch extends Xenbus driver to support multi-page ring, which in
> general should improve throughput. Changes to various frontend / backend
> to adapt to the new interface are also included.
> 
> Affected Xen drivers:
> * blkfront/back
> * netfront/back
> * pcifront/back
> 
> The interface is documented, as before, in xenbus_client.c.
> 

Please note that this patch won't apply cleanly on upstream kernel as it
relies on some patches that are not in tree.

I mainly want to collect views on the interface.  Also in the HVM case I
use vmap, I would like to know if I get it right.


Thanks
Wei.

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