[Xen-devel] Re: Communicating with the domU from dom0 without Network

["Mike D. Day" <ncmike@xxxxxxxxxx>]

On 07/08/06 12:18 -0400, Michael LeMay wrote:
> This is precisely the sort of problem that the Keir's proposal seems to
> address.  I've copied my comments on the proposal below; perhaps we can
> discuss them further now since nobody was interested when I originally
> posted them. :-)
Sounds like RDMA, with some xen optimization. Would be good to see
this happen.

Mike

> The bottom of page 18 in the Xen Roadmap proposal recommends considering
> how to "export byte stream
> (TCP) data between domains in a high performance fashion."  For
> communications that occur between domains on a single physical machine,
> it would seem logical to setup a new address and protocol family within
> Linux that could be used to create and manipulate stream sockets via the
> standard interfaces (I'm focusing on Linux at this point, although
> similar adaptations could be made to other kernels).  Then, behind the
> scenes, the Xen grant tables could be used to efficiently transfer
> socket buffers between the domains.  This should involve much less
> overhead than directly connecting two network frontends or performing
> other optimizations at lower layers, since it would truncate the
> protocol stack and avoid unnecessary TCP-style flow control protocols.

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