Re: [Qemu-devel] [PATCH v3 9/9] coalesce adjacent iovecs

[Michael S. Tsirkin]

On Thu, Mar 21, 2013 at 07:22:01PM +0100, Juan Quintela wrote:
> "Michael S. Tsirkin" <address@hidden> wrote:
> 
> >> <header>
> >> <page>
> >> <header>
> >> <page>
> >> <header>
> >> <page>
> >> 
> >> We can optimize at some pount to write a bigger/different header and
> >> sent a bunch of pages together, but just now we don't have that code.
> >> 
> >> Later, Juan.
> >
> > Sending the page can do vmsplice, can't it?
> > Multipage is likely a good idea anyway, e.g. RDMA wants to
> > do this too.
> 
> RDMA requires de pages lock into memory, no?
> 
> Later, Juan.

That's a separate issue, but the point is it is asynchronous.
It can be made to behave exactly the same implementing this API:

        - send async: lock, send
        - flush: poll for completion, unlock